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Title:
MOTOR POWER DEVICE AND A MOTOR INCLUDING THE SAME
Document Type and Number:
WIPO Patent Application WO/2008/069359
Kind Code:
A3
Abstract:
A motor power device includes a power circuit having a low voltage part that receives and converts AC power and outputs DC voltage, wherein a first power for a motor drive coil and a second power for a control circuit controlling the motor drive coil are supplied by using the DC voltage outputted from the power circuit, and a motor may include the motor power device. In one aspect, a motor power device is provided that may supply a DC voltage by using an AC power regardless of the magnitude of the AC power. In another aspect, a power circuit may output suitable DC voltage with less cost even though the magnitude of the AC power has changed. In yet another aspect, a motor power device is provided that may supply power for driving a motor drive coil and a power for a control circuit controlling the motor drive coil using one power circuit.

Inventors:
LEE, Ho Jae (307-307 Daedong Hanmaeum Town, 1251 Oe-dong, Gimhae-s, Gyeongsangnam-do 621-922, KR)
Application Number:
KR2006/005396
Publication Date:
May 14, 2009
Filing Date:
December 12, 2006
Export Citation:
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Assignee:
LG ELECTRONICS INC. (20 Yoido-dong, Youngdungpo-guSeoul, 150-721, KR)
LEE, Ho Jae (307-307 Daedong Hanmaeum Town, 1251 Oe-dong, Gimhae-s, Gyeongsangnam-do 621-922, KR)
International Classes:
H02P7/00; H02K11/00; H02M7/219
Attorney, Agent or Firm:
BAHNG, Hae Cheol et al. (KBK & Associates, 15th Floor YoSam Building648-23, Yeoksam-dong, Kangnam-k, Seoul 135-080, KR)
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Claims:

Claims

[I] A motor power device comprising: a power circuit comprising a low voltage part that receives/depressurizes an AC power to output the AC power as a low pressure DC voltage, wherein a first power for a motor drive coil and a second power for a control circuit controlling the motor drive coil are supplied by using the low pressure DC voltage outputted from the power circuit. [2] The motor power device of claim 1, wherein the low voltage part comprises a capacitor that depressurizes the inputted AC power based on an internal capacity. [3] The motor power device of claim 2, wherein the capacity of the capacitor is variable according to the size of the AC power.

[4] The motor power device of claim 2, wherein the capacitor is a film capacitor.

[5] The motor power device of claim 2, wherein the capacitor is a film capacitor made of polypropylene. [6] The motor power device of claim 1, wherein the power circuit further comprises a protection circuit connected between an AC power terminal and the low voltage part in serial to protect the power circuit if there is a malfunction of the low voltage part. [7] The motor power device of claim 6, wherein the protection circuit comprises a fuse configured as a circuit beaker. [8] The motor power device of claim 1 , wherein the power circuit further comprises a rectifier circuit connected to a rear terminal of the low voltage part to rectify the DC voltage outputted from the low voltage part. [9] The motor power device of claim 8, wherein the power circuit further comprises a smoothing circuit connected to the rectifier circuit in parallel to smooth the DC voltage rectified at the rectifier circuit. [10] The motor power device of claim 8, wherein the power circuit further comprises a voltage drop part connected to an output terminal of the rectifier circuit to drop the level of the DC voltage outputted at the rectifier circuit, further wherein the

DC voltage outputted at the rectifier circuit is configured as a second power for a control circuit.

[II] The motor power device of claim 10, wherein the voltage drop part is configured to connect at least two resistors in serial.

[12] The motor power device of claim 10, wherein the power circuit further

comprises a zener diode that regularly maintains the DC voltage outputted at the voltage drop part.

[13] The motor power device of claim 12, further comprising a resistor connected to the zener diode in serial to protect the zener diode from overcurrents.

[14] The motor power device of claim 1, wherein the motor drive coil comprises a first coil and a second coil, further wherein the control circuit comprises, a HIC (Hall Integrated Circuit) that senses a rotation of a motor to output a square wave output signal, a signal reversal switch that reverses the output signal of the HIC, a first coil control switch connected to the first coil in serial to control the first coil switched on/off based on the output signal outputted at the first coil, and a second coil control switch connected to the second coil in serial to control the second coil switched on/off based on the output signal reversed at the signal reversal switch.

[15] The motor power device of claim 14, wherein the control circuit further comprises switch protection circuits connected to the first coil control switch and the second coil control switch, respectively, to remove a noise generated when the first and second coil control switches are switched on/off.

[16] . The motor power device of claiπϊ.15, wherein the switch protection circuit is a

' - ■ ' ' . film capacitor made of polypropylene. ; ' '■ • - ;;

[17] . A motor power device comprising: .

; . ' ' a motor power circuit comprising a ' fist lowvoltage part that receives/de- pressurizes an. AC power to output an AC power as a DC power, and a control power circuit comprising a second low voltage part that receives/ depressurizes the AC power to output the AC power as a low pressure DC voltage, wherein a first power for a motor drive coil is supplied by using the DC voltage outputted at the motor power circuit and a second power for controlling the motor drive coil is supplied by the low pressure DC voltage outputted. at the control power circuit.

[18] The motor power device of claim 17, wherein the first and second low voltage parts comprise capacitors, respectively, that depressurize the AC power received/ inputted based on the capacity thereof.

[19] The motor power device of claim 18, wherein the capacity of the capacitor is variable corresponding to the size of the AC power.

[20] The motor power device of claim 18, wherein the capacitor is a film capacitor.

[21] The motor power device of claim 18, wherein the capacitor is a film capacitor made of polypropylene.

[22] The motor power device of claim 17, further comprising a protection circuit connected to each front terminal of the first and second low voltage part to protect the motor power circuit and the control power circuit if there is a malfunction of the first and second low voltage part.

[23] The motor power device of claim 22, wherein the protection circuit comprises a fuse as a circuit breaker.

[24] The motor power device of claim 17, wherein the motor power circuit further comprises a rectifier circuit connected to a rear terminal of the first low voltage part to rectify the DC voltage outputted at the first low voltage part.

[25] The motor power device of claim 24, further comprising a smoothing circuit connected to the rectifier circuit in parallel to smooth the DC circuit rectified at the rectifier circuit.

[26] The motor power device of claim 17, wherein the control power circuit further comprises a rectifier circuit connected to the motor drive coil in parallel to receive/rectify the DC voltage outputted at the second low voltage part, further wherein the DC voltage outputted at the rectifier circuit is configured as a second power for the control circuit.

[27] The motor power device of claim 26, wherein the rectifier circuit is configured to connect at least two rectifier diodes in serial.

[28] The motor power device of claim 26, wherein the control power circuit further comprises a zener diode that regularly maintains the DC voltage outputted at the rectifier circuit.

[29] The motor power device of claim 28, further comprising a resistor connected to the zener diode in serial to protect the zener diode frαn overcurrents.

[30] The motor power device of claim 17, wherein the motor drive coil comprises a first coil and a second coil, further wherein the control circuit comprises, a HIC (Hall Integrated Circuit) that senses a rotation of a motor to output a square wave output signal, a signal reversal switch that reverses the output signal of the HIC, a first coil control switch connected to the first coil in serial to control the first coil switched on/off based on the output signal outputted at the first coil, and a second coil control switch connected to the second coil in serial to control the

second coil switched on/off based on the output signal reversed at the signal reversal switch. [31] The motor power device of claim 30, wherein the control circuit further comprises switch protection circuits connected to the first coil control switch and the second coil control switch, respectively, to remove a noise generated when the first and second coil control switches are switched on/off. [32] The motor power device of claim 31, wherein the switch protection circuit is a film capacitor made of polypropylene. [33] A motor comprising: a bracket that defines an exterior of the motor; a PCB held within the bracket to have an electric pattern and various elements mounted thereon; a stator provided on the PCB; a rotor provided within the stator to rotate; a shaft that rotate together with the rotor to transmit a rotational force of the rotor outside; and a motor power device comprising a power circuit comprising a low voltage part that receives/depressurizes an AC power and outputs the AC power as a DC voltage, wherein a first power for a motor drive coil and a second power for a control circuit controlling the motor drive coil are supplied by using the DC voltage outputted from the power circuit. [34] A motor comprising: a bracket that defines an exterior of the motor; a PCB held within the bracket to have an electric pattern and various elements mounted thereon; a stator provided on the PCB; a rotor provided within the stator to rotate; a shaft that rotate together with the rotor to transmit a rotational force of the rotor outside; and a motor power device comprising a motor power circuit comprising a fist low voltage part that receives/depressurizes an AC power to output an AC power as a

DC power, and a control power circuit comprising a second low voltage part that receives/depressurizes the AC power to output the AC power as a low pressure

DC voltage, wherein a first power for a motor drive coil is supplied by using the

DC voltage outputted at the motor power circuit and a second power for

controlling the motor drive coil is supplied by the DC voltage outputted at the control power circuit.

Description:

Description

MOTOR POWER DEVICE AND A MOTOR INCLUDING

THE SAME

Technical Field

[1] The present invention relates to a motor power device, more particularly, to a motor power device, which supplies the power needed to operate a motor and a control circuit controlling the motor, and a motor including the same easily fabricated with enhanced efficiency and durability, which has a compact structure to be convenient to a user. Background Art

[2] Recently, a DC motor has been adapted as a motor useable in minimizing energy loss such as a motor for cold air circulation of a refrigerator, in stead of a shading coil type AC motor. This is because energy loss rate of a shading coil AC motor is 80% of the inputted energy, compared to a DC motor having less energy loss.

[3] However, an external DC power supply device should be additionally provided outside to supply a DC power to a DC motor. Thereby, since it is difficult to secure spare space which holds the DC motor having the auxiliary DC power supply device against nowadays modern trend which is minimal, leaner and lighter.

[4] Also, since an external DC power supply device should be fabricated separately from a motor, there is a problem complex work process/high cost.

[5] Due to that reason, a DC power is not applied to a DC motor and a DC power supply circuit is configured as one body with a motor drive operation so that a DC power supply circuit may be operated by an AC normal power. Thereby, a control circuit capable of control a motor without an auxiliary external DC power supply device.

[6] FIG. 1 illustrates a structure of a conventional motor power device. A power circuit that supplies a DC power by using an AC power is configured as one body with a control circuit which controls motor drive.

[7] As shown in FIG. 1 , a conventional motor power device includes a motor power circuit and a control power circuit. The motor power circuit supplies a power (Vl) needed for operation of a motor drive coil (Ll) and (L2). The control power circuit supplies a power (V2) needed for a control circuit controlling the motor drive coil (Ll) and QJl).

[8] At this time, the motor power circuit includes a rectifier circuit and a pressure

reduction circuit. Hence, the motor power circuit receives an AC power to rectify and depressurizes the rectified high pressure DC voltage. After that, the motor power circuit supplies the depressurized low pressure DC voltage to the control circuit as a control power (V2).

[9] The control circuit includes a hall sensor coupled to a motor rotor (not shown) to senses the rotation of the motor and a switching element switchable based on a signal sensed by the hall sensor. The control circuit having the above configuration receives a voltage (V2) of a predetermined level from the control power circuit and controls the switching element's on/off based on a signal sensed by the hall sensor. Thereby, a high pressure DC voltage is applied to both opposite ends of the motor drive coil (Ll) and (IJl) to drive the motor.

[10] As mentioned before, a motor power device supplies a power to motor drive coil

(Ll) and (L2) and a control circuit controlling the motor drive coil (Ll) and (L2).

[11] However, since each size of an AC power is various according to the country or region in which a motor including an motor power device, components of the conventional motor power device should be re-designed to be adapted to each size of the AC power, such as a motor drive coil and the like.

[12] That is, a voltage of a DC power gained by rectification is greater as an AC power is getting greater. Thus, beside the motor drive coil, re-design is needed to increase internal pressure of components with respect to a switching element.

[13] Since the size of the AC power affects the production design, there is problems of complicated fabrication process, cost of parts increases and large size of production. Disclosure of Invention Technical Problem

[14] Accordingly, the present invention is directed to a motor power device and a motor including the same.

[15] An object of the present invention is to provide a motor power device which can supply a low pressure DC voltage by using an AC power regardless of a size of an AC power.

[16] Another object of the present invention is to provide a power circuit suitable for a voltage size of an AC power in variation of the AC power with less cost.

[17] A further object of the present invention is to provide a motor power device which can supply a power for driving a motor drive coil and a power for a control circuit controlling the motor drive coil via one power circuit.

[18] A still further object of the present invention is to provide a motor with conveniently usage and improved durability/reliability. Technical Solution

[19] To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a motor power device includes a power circuit comprising a low voltage part that receives/depressurizes an AC power to output the AC power as a low pressure DC voltage, wherein a first power for a motor drive coil and a second power for a control circuit controlling the motor drive coil are supplied by using the low pressure DC voltage outputted from the power circuit.

[20] Here, the low voltage part includes a capacitor that depressurizes the inputted AC power based on an internal capacity. The capacity of the capacitor may be variable according to the size of the AC power.

[21] The power circuit further includes a protection circuit connected between an AC power terminal and the low voltage part in serial to protect the power circuit if there is a malfunction of the low voltage part.

[22] The power circuit further includes a rectifier circuit connected to a rear terminal of the low voltage part to rectify the DC voltage outputted from the low voltage part. The power circuit further includes a smoothing circuit connected to the rectifier circuit in parallel to smooth the DC voltage rectified at the rectifier circuit.

[23] The power circuit further includes a voltage drop part connected to an output terminal of the rectifier circuit to drop the level of the DC voltage outputted at the rectifier circuit, and the DC voltage outputted at the rectifier circuit is configured as a second power for a control circuit.

[24] The power circuit further includes a zener diode that regularly maintains the DC voltage outputted at the voltage drop part. Also, the power circuit further includes a resistor connected to the zener diode in serial to protect the zener diode from overcurrents.

[25] The motor drive coil includes a first coil and a second coil. The control circuit includes a HIC (Hall Integrated Circuit) that senses a rotation of a motor to output a square wave output signal, a signal reversal switch that reverses the output signal of the HIC, a first coil control switch connected to the first coil in serial to control the first coil switched on/off based on the output signal outputted at the first coil, and a second coil control switch connected to the second coil in serial to control the second coil switched on/off based on the output signal reversed at the signal reversal switch.

[26] In another aspect of the present invention, a motor power device includes a motor power circuit including a fist low voltage part that receives/depressurizes an AC power to output an AC power as a DC power, and a control power circuit comprising a second low voltage part that receives/depressurizes the AC power to output the AC power as a low pressure DC voltage, wherein a first power for a motor drive coil is supplied by using the DC voltage outputted at the motor power circuit and a second power for controlling the motor drive coil is supplied by the DC voltage outputted at the control power circuit.

[27] Here, the first and second low voltage parts comprise capacitors, respectively, that depressurize the AC power received/inputted based on the capacity thereof. The capacity of the capacitor is variable corresponding to the size of the AC power.

[28] The motor power device further includes a protection circuit connected to each front terminal of the first and second low voltage part to protect the motor power circuit and the control power circuit if there is a malfunction of the first and second low voltage part.

[29] The motor power circuit further includes a rectifier circuit connected to a rear terminal of the first low voltage part to rectify the DC voltage outputted at the first low voltage part, and a smoothing circuit connected to the rectifier circuit in parallel to smooth the DC circuit rectified at the rectifier circuit.

[30] The control power circuit further includes a rectifier circuit connected to the motor drive coil in parallel to receive/rectify the DC voltage outputted at the second low voltage part. The DC voltage outputted at the rectifier circuit is configured as a second power-for the control circuit.

[31] The control power circuit further includes a zener diode that regularly maintains the

DC voltage outputted at the rectifier circuit, and a resistor connected to the zener diode in serial to protect the zener diode from overcurrents.

[32] The motor drive coil includes a first coil and a second coil. The control circuit includes a HIC (Hall Integrated Circuit) that senses a rotation of a motor to output a square wave output signal, a signal reversal switch that reverses the output signal of the HIC, a first coil control switch connected to the first coil in serial to control the first coil switched on/off based on the output signal outputted at the first coil, and a second coil control switch connected to the second coil in serial to control the second coil switched on/off based on the output signal reversed at the signal reversal switch.

[33] In a further aspect of the present invention, a motor including the motor power device is presented.

Advantageous Effects

[34] The present invention has following advantageous effects.

[35] According to the power device supplying a low pressure DC voltage to the motor by using an AC power, there is an advantageous effect that the simple replacement of parts can depressurize the AC power if an AC power is variable based on a region. Thereby, since an additional structure for increase an internal pressure of a coil and a switching element is needed, the production process and structure variation can be facilitated.

[36] Furthermore, since one power circuit can supply the power for driving the motor and the power for the motor control circuit, an auxiliary power supply means can be emitted. Thereby, there is another advantageous effect that production cost may be reduced as well as that a minimal size for a product may be possible.

[37] Also, the motor including the motor power device has following advantageous effects.

[38] First, the motor of the present invention can be fabricated without difficulties and the exterior of the motor is compact. Thus, there is an advantageous effect that space for the motor can be reduced to expand the area to which the motor is adapted.

[39] Second, the motor of the present invention reduces a leakage flux. Thus, there is another advantageous effect that motor efficiency is enhanced with least electricity loss.

[40] Third, the motor of the present invention has a further advantageous effect that it can minimize vibration due to reducing cogging torque and control the rotational speed of the shaft and torque smoothly.

[41] Finally, the motor of the present invention can prevent malfunctions which night be generated in the fabrication process or usage. Thus, there is a further advantageous effect that a motor having high reliability as well as high durability may be provided. Brief Description of the Drawings

[42] The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

[43] FIG. 1 is a block view illustrating a conventional motor power device;

[44] FIG. 2 is a block view illustrating an embodiment of motor power device according to the present invention;

[45] FIG. 3 is a block view illustrating another embodiment of a motor power device according to the present invention;

[46] HG. 4 is a circuit diagram illustrating the motor power device of HG. 2;

[47] HG. 5 is a circuit diagram illustrating the motor power device of HG. 3;

[48] HG. 6 is an exploded perspective view illustrating a motor of the present invention;

[49] HG. 7 is a perspective view illustrating that sane parts of the motor shown in HG.

6 are assembled; [50] HG. 8 is a perspective view illustrating a down surface of an upper bracket shown in HG. 6; [51] HG. 9 is a plane view illustrating that a lower bracket of HG. 6 is fastened to a

PCB; and [52] HG. 10 is a plane view illustrating a stator of HG. 6.

Best Mode for Carrying Out the Invention [53] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accαnpanjing drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. [54] HGS. 2 and 3 are block views illustrating a power circuit that depressurizes an AC power as inputted power. Here, the inputted power which is an external power is supplied Via a connector. The connector will be described later. [55] The preset application presents that a power circuit suppljing a DC power includes a technical feature of depressurizing an AC power, such that a motor power device corresponding to a size of an AC power with much less cost may be provided. [56] Especially, HG. 2 illustrates an embodiment that a power (Vl) for a motor drive coil Ll and L2 and a power V2 for a control circuit are supplied via one power circuit. [57] That is, one power circuit can supply a power Vl of a motor drive coil and a power

V2 of a control circuit that controls the motor drive coil. [58] HG. 3 illustrates another embodiment that there are separately provided a power circuit (hereinafter, a motor power circuit) suppling a power Vl for a motor drive coil

Ll and L2 and a power circuit (hereinafter, a control power circuit) suppljing a power

V2 for the control circuit. [59] An AC power is branched/inputted on the motor power circuit and the control power circuit. The motor power circuit and the control power circuit depressurize this

AC power. [60] The motor power device of the present invention will be described in detail.

[61] FIG. 4 illustrates a circuit diagram of the motor power device shown in FIG. 2. The motor power device is formed on a PCB, which will be described later. A motor drive coil is wound around teeth.

[62] Firstly, the motor drive coil of the motor includes a first coil Ll and a second coil

L2.

[63] A control circuit, that controls the power supplied to the motor drive coils Ll and

L2, includes a hall integrated circuit (hereinafter, HIC), a signal reversal switch Ql, a first coil control switch FETl and a second coil control switch FET2. The HIC senses a rotation of a motor to output a square wave output signal. The signal reversal switch Ql reverses the signal outputted frαn the HIC. The FETl is serially connected to the first coil Ll to control switching on/off of the first coil Ll based on the signal outputted frαn the HIC. The second coil control switch FET2 is serially connected to the second coil L2 to control switching on/off of the second coil L2 based on the signal reversed by the signal reversal switch Ql.

[64] Here, a base terminal of the signal reversal switch Ql is connected to a signal output terminal of the HIC. An emitter terminal of the signal reversal switch Ql is connected to a ground terminal and a collector terminal of the signal reversal switch Ql is connected to a gate terminal of the second coil control switch FET2.

[65] A gate terminal of the first coil control switch FETl is connected to a signal output terminal of the HIC. A source terminal of the first coil control switch FETl is connected a ground terminal and a drain terminal of the first coil control switch FETl is connected to the first coil Ll.

[66] Also, a gate terminal of the second control switch FET2 is connected to the collector terminal of the signal reversal switch Ql. A source terminal of the second coil control switch FET2 is connected to a ground terminal and a drain terminal of the second coil control switch FET2 is connected to the second coil L2.

[67] That is, an output signal of the HIC is reversed and gate input signals of the first and second coil control switch FETl and FET2 are alternated, such that the signal reversal switch Ql is generated.

[68] A switch protection circuit is provided in the present invention to remove a noise generated in the switching on/off of the first and second coil control switch FETl and FET2. The switch protection circuit may be protection capacitors C9 and ClO connected in parallel to the first and second coil control switch FETl and FET2, respectively.

[69] Preferably, the protection capacity C9 and ClO configured as a switch protection

circuit is a film capacity made of PP (Polypopylene). [70] According to the present invention, one power circuit (hereinafter, a motor control power circuit) is provided to supply a power Vl for driving the motor drive coils Ll and L2 and a power V2 for driving the control circuit. [71] The motor control power circuit is a low voltage part, which depressurizes an AC power inputted after being serially connected to an AC power supply to alternatively generate a gate input signal of the first and second coil control switch FETl and FET2, and includes a capacitor Cl for safety. [72] Here, it is preferred that the capacity Cl is designed by varying capacity based on an AC power voltage size produced in a country or region where a product using the same is released. [73] That is, although the AC power is changed, only the capacity of capacitor Cl is changed to supply a DC voltage applied to the motor drive coils Ll and L2 without change of coil specification.

[74] Preferably, the safe capacitor Cl is a film capacitor made of PP (Polypropylene).

[75] The motor control power circuit may have a fuse Fl between the AC power terminal and the safe capacitor Cl to protect an internal circuit in case that there is a malfunction of the safe capacitor Cl such as being short and the like. [76] Furthermore, the motor control power circuit further includes a varistor ZNERl connected in parallel to suppress a surge voltage generated at the AC power, a bridge type rectifier diode BD to rectify a low pressure DC voltage outputted via the safe capacitor Cl, and a smoothing capacitor C2 connected in parallel to the bridge type rectifier diode BD to smooth the DC voltage rectified at the bridge type rectifier diode

BD. [77] The DC voltage outputted after being depressurized at the motor control power circuit is supplied to a power Vl for the motor drive coils Ll and L2. [78] A power V2 for the control circuit needs a relatively low voltage, for example, DC

6-15V, compared to the power Vl for the motor drive coils Ll and L2. Thereby, the motor control power circuit further includes a voltage drop means that drops a DC voltage level outputted via the smoothing capacitor C2. [79] Here, the voltage drop means is configured to connect at least two resistors

(hereinafter, voltage drop resistors) in serial. [80] The DC voltage V2 dropped via the voltage drop means R12 and R13 is supplied to the HIC of the control circuit and the driving power of the signal reversal switch Ql. [81] The voltage drop resistors rl2 and R13 are configured to select an appropriate

resistor value based on a voltage level required by the control circuit, such that a necessary power may be supplied and voltage balance may be maintained between the control circuit and the motor control power circuit. [82] The motor control power circuit further includes a zener diode ZDl that regularly maintains the DC voltage outputted from the voltage drop resistors R12 and R13, and a resistor R3 serially connected to the zener diode ZDl to protect the zener diode ZDl from overcurrents. [83] Here, the resistors may be connected to the zener diode ZDl in serial to make the zener diode ZDl have a low rating. [84] Next, an operation of the motor power device having the above configuration will be described. [85] Once an AC power is applied to the motor control power circuit, the AC power is depressurized via the safety capacitor Cl and the rectifier diode BD and outputted as a low pressure DC voltage. [86] Ripple of the DC voltage Vl is removed via the voltage drop resistors R12 and

R13. Hence, the level of the DC voltage Vl is dropped and supplied to the power of the control circuit. That is, the DC voltage V2 outputted via the voltage drop resistors

R12 and R13 is used as a driving power for both the hall sensor and the signal reversal switch Ql. [87] Once the DC voltage V2 is applied to the HIC, the HIC senses the motor rotation to generate a square wave signal. Hence, the output signal of the HIC is inputted at a gate of the first coil control switch FETl and a base of the signal reversal switch Ql as the same time. [88] Thus, once a high signal is applied to the gate of the first coil control switch FETl, the collector output signal of the signal reversal switch Ql is reversed into a low signal and the low signal is applied to the gate of the second coil control switch FET2. [89] The first coil control switch FETl is switched on to flow electric currents to the first coil Ll and the second coil control switch FET2 is switched off to cut off electric currents of the second coil L2. [90] Thus, the first coil Ll is magnetized to generate a rotational force and the rotor of the motor rotates 180°. the magnetic polarity sensed by the HIC is opposite to that before the 180° rotation to generate an output signal having an opposite phase. Hence, the fist coil control switch FETl is switched off and the second coil control switch

FET2 is switched on. [91] Due to the switching operation, the second coil L2 is magnetized to rotate the rotor

of the motor 360° and the rotational inertia force rotates the rotor of the motor in the same direction as the first coil Li is magnetized. [92] Thus, this embodiment has an advantageous effect that the power Vl of the motor drive coils Ll and L2 and the power V2 of the control circuit are supplied via one circuit, as well as the effect that safe power is supplied by only the capacity variation . of the. safe capacitor Cl even when the AC power is changed. [93] Next, referring to FIGS. 3 and 5, another embodiment of the motor power device

. . according to the present invention will be described. . . .

[94] FIT. 5 illustrates a specific circuit diagram of the motor power shown in HG. 3.

[95] This embodiments has the same motor drive coils Ll, and L2 and the control circuit as those of the above embodiment. A motor power circuit for supplying the power Vl of the motor drive coils Ll and L2 and a control power circuit for supplying the power

V2 of the control circuit are separately designed, which is different from the above embodiment. [96] A motor power circuit, which is the same as the motor control power circuit of the above embodiment, includes a safety capacitor Cl, a bridge rectifier diode BD and a smoothing capacitor C2. [97] That is, an AC power is depressurized via the capacitor C 1 and rectified/smoothed via the bridge rectifier diode and the smoothing capacitor C2. hence, it is outputted as V a low pressure DC voltage. ' ' • - ; ' " • ' ■• . . ■

[98] . The outputted KD voltage Vl is applied to the motor drive coils Ll and L2 to drive _ . ' . the motor. ' ■' , \ . . • ■ : ■ ■ ■ ' ■ , ■ '■ ./ ' " ' : , ' . ■ ■; • - , ' , ' . " [99] .. The control power circuit includes a safety capacity C3 branched frcm an AC

• power terminal to receive/depressurize the AC power. ■ ' . ' . . •'

[100] Here, the safety capacitor C3 may be a film capacitor made of the same material as the capacitor Cl. [101] The control power circuit further includes a voltage drop resistors Rl 2 and Rl 3, and a rectifier diode D4 and D5. the voltage drop resistors R12 and R13 drops the DC voltage level outputted from the bridge rectifier diode BD to create a voltage level for the control circuit. The rectified diodes D4 and D5 receives/rectifies the low pressure

DC voltage outputted via the safety capacitor C3.

[102] Preferably, the rectifier diode D4 and D5 is a single-phase rectifier circuit.

[103] Also, the control power circuit further includes a zener diode ZDl that regularly maintains the DC voltage outputted frcm the voltage drop resistors R12 and R13 and the rectifier diodes D4 and D5, and a resistor R3 serially connected to the zener diode

ZDl to protect the zener diode ZDl from overcurrents.

[104] Thereby, the DC voltage outputted from the control power circuit is supplied to drive the HIC and the signal reversal switch Ql of the control circuit.

[105] The operation of the motor drive coils Ll and L2 that receives a power via the motor power circuit and the operation of the control circuit that receives a power via the control power circuit are the same as those described in the above embodiment.

[106] Another embodiment presents the power device separately having the motor power circuit and the control power circuit and also a safe power may be supplied by varying the capacity of the safe capacitors Cl and C3, although an AC power is changed.

[107] Next, referring to FIGS. 6 to 10, a motor including the power device described above will be described in detail.

[108] FIG. 6 is an exploded perspective view of a motor 100 according to the present invention.

[1C9] As shown in HG. 6, a motor of the present invention includes a bracket 110, a PCB

150, a stator 140, a rotor 170 and a shaft 180. The bracket 110 defines an exterior of the motor. The PCB 150 is held within the bracket 110 and an electric pattern (not shown). Also, various elements (not shown) are mounted in the PCB 150.

[110] The bracket 110 includes a lower bracket 120 and an upper bracket 130. The lower and upper brackets 120 and the 130 are coupled each other to hold various components therein. To couple the lower and upper brackets 120 and 130 each other, a fastening boss 122 and 132 may be fastened to a fastening hole 121 and 131 formed on the fastening boss 122 and 132 by a screw (not shown).

[Ill] Referring to FIGS. 6 and 10, the stator 140 of the motor according to the present invention will be described in detail.

[112] The stator 140 includes a stator core 141 and a tooth 142.

[113] As shown in the above drawings, the stator core 141 may be formed in a circular shape and forms a magnetic path. The tooth 142 is projected in a radial direction of the stator core 141 and a coil is wound around the tooth 142. The motor shown in the drawings is embodied as an inner rotor type motor in which a rotor is provided within a stator core 141. Thus, the tooth 142 is projected inwardly in a radial direction. A plurality of teeth 142 may be formed and FIG. 5 shows that four of teeth 142 are formed.

[114] A plurality of tooth parts 144 are alternated with a plurality of extending parts 145 along an inner circumferential direction of the stator core 141. Here, the teeth 142 are provided on the tooth parts 144, respectively. The extending part 145 is extending

convexly and inwardly in a radial direction.

[115] The extending part 145 may be extending inwardly and convexly between the two neighboring tooth parts 144 in a radial direction. Preferably, the extending part 145 increases its thickness entirely to secure enough space needed in forming a magnetic flux. Thereby, a leakage flux due to a high saturation on flux density is minimized to maximize an efficiency of the motor and the thickness of the stator core 141 increases to reinforce a structural strength of the stator core 141.

[116] Alternatively, the extending part 145 may be formed outwardly in a radial direction.

But, this might enlarge the size of the stator core 141 only to enlarge the entire size of the motor.

[117] The stator core 141 may be formed by multi-layering a plurality of unit stator cores.

That is, a plurality of thin unit stator cores may be multi-layered to form a stator core 141 having a predetermined height. The stator core 141 formed by multi-layered unit stator cores may minimize a leakage flux, which might be formed in a perpendicular direction of the magnetic flux, to enhance efficiency of the motor. It is also preferred that the teeth 142 are formed by a multi-layering method.

[118] If the stator core 141 is formed by multi-layering the unit stator cores, the stator cores 141 should be fastened to each other as one body. That means that the one stator core 141 formed as one body is necessary. Thus, a caulking part 146 should be provided to fasten the stator cores 141 to each other. The caulking part 146 is formed . on the stator core 141, more specifically, a portion having a wide width. The caulking 1 . part 146 passes through an upper and lower part of the stator core 141 to ^ minimize a : - . ' leakage flux of a fringing flux due to the caulking part 146.

[119] ' According to the present invention, the caulking part 146 may be formed on the extending part 145. Preferably, the caulking part.146 is formed on a center of the extending part 145, which has the widest width.

[120] Thereby, it is possible to perform secure caulking. The caulking part 146 minimizes distortion of the stator core 141 and prevents efficiency deterioration.

[121] Meanwhile, the teeth 142 may be formed as one body with the stator core 141, that is, the teeth 142 may be formed as one body with the stator core 141 from the beginning. Alternatively, the teeth 142 are formed separately from the stator core 141 and fastened to the stator core 141 to make easy the fabrication of the stator 140 as well as winding.

[122] A tooth slot 147 is formed in a center of the tooth part 144 formed on the stator core

141 and an end of the tooth 142 is inserted in the tooth slot 147 to fasten the tooth 142

to the stator core 141.

[123] Thus, a tooth 142 is inserted in a bobbin 143 and a coil is wound around the bobbin 143 to insert the tooth 142 in the tooth slot 147, such that the fastening between the bobbin 143 and the tooth 142 and winding may be smooth.

[124] Next, a groove 148 may be formed on an outer circvmferential surface of the stator . core 141 in a longitudinal direction of the stator core 141. Preferably, a plurality of grooves 148 may be formed along circumferential direction of an outer surface of the stator core 141. .

[125] The groove 148 also helps the unit stator cores to separate from a blanking mold when the unit stator cores are blanked and molded. More specifically, the groove 148 makes the internal pressure of the mold same as the external pressure to smoothly separate the unit stator cores from the mold. Furthermore, the groove 148 guides the unit stator cores.

[126] It is preferred in the present invention that the groove 148 is formed on an outer portion of the tooth part 147 formed on the stator core 141 to minimize variation of core size caused when the tooth 142 is inserted in the tooth slotl47. Thus, to perform this function, it is preferred that the groove 148 may be corresponding to a center of the tooth slot 147.

[127] According to the present invention, it is preferred that a coil is wound around the bobbin 143 configured for insulation arid winding between a coil and the tooth 142 without any difficulties, instead of directly winding a coil around the tooth 142. .

[128] . The bobbin 143 may be configured as an inner wall 143b, a winding part 143b and ah outer wall 143c. A coil is wound around the winding part 143b between the inner . , wall 143a and the outer ' wall 143c, and the inner wall 143a and the outer wall 143c prevent the coil from coming outside.

[129] Here, the outer wall 143c of the bobbin 143 is contacted with the tooth part 144 provided on the stator core 141. Preferably, an inner wall of the tooth part 144 is plane to be contacted with the outer wall 143 of the bobbin 143, such that the bobbin 143 may be coupled to the stator core 141 more securely.

[130] Bay the way, the motor of the present invention may have four teeth 142, for example. Hence, if the power is applied to the coil wound around the tooth 142, an N- pole and an S-pole are alternatively formed on each tooth 142. As shown in FIG. 5, if an N-pole is formed on a tooth 142 provided on most upper position, an S-pole is formed on neighboring teeth.

[131] Polarity is formed on the teeth 142 and a leakage flux increases as the distance

between the teeth is getting farther and farther. Thus, a pole shoe 149 may be formed on a front end of each tooth 142 to minimize a leakage flux and is extended a predetermined length in both opposite circumferential directions to be fixedly contacted with an outer surface of the rotor 170. Thereby, a leakage flux caused between the two neighboring teeth may be minimized.

[132] As shown in HG. 10, the pole shoe 149 formed on one tooth 142 may not be connected to the next pole shoe 149 formed another neighboring tooth 142. This is because two different polarities are formed on two neighboring pole shoes 149, respectively. If the two neighboring pole shoes 149 are connected, polarity may deteriorate.

[133] Together with the pole shoe 149 formed to minimize a leakage flux, it is preferred to reduce cogging torque or torque ripple generated from the shaft 180 and the rotor 170 by drastic change of polarity between teeth. This is because the cogging torque makes the control of motor difficult and causes vibration or noise.

[134] Accordingly, it is preferred to smooth down the drastic change of polarity between the two neighboring teeth.

[135] According to the present invention, a cogging torque reduction part formed on the pole shoe 149 may be further included to prevent polarity from changing drastically, such that cogging torque may be minimized. .

[136] The cogging torque reduction part-may be formed the cogging torque reduction part is formed. at both ends of the pole shoe in a circumferential direction, respectively, or the cogging torque reduction part is formed only a first end of the pole shoe in a circumferential direction. . This is because the magnetic, polarity is changed at the end of the pole shoe 149 and the end of the neighboring pole shoe.

[137] Meanwhile, the cogging torque reduction part may reduce magnetic flux density and the width of the cogging torque reduction part may be narrower than the portion of the pole shoe 149. as an example, the cogging torque reduction part may be a cut part 149a formed at the end of the pole shoe 149. the cut part 149a may reduce the magnetic flux density to prevent a magnetic polarity from changing drastically. The cut part may increase a leakage flux. Thus, it is preferred that the cut part is formed at only one end of the pole shoe 149.

[138] Especially, the cut part 149a is formed in a direction expanding air gap between the rotor 170 and the tooth. The cut part 149a may face the rotor. This is because permanent magnets (not shown) are alternatively provided along a circumferential surface of the rotor 170 and it is preferred to increase air gap, related to the permanent

magnet of the rotor.

[139] As shown in FIGS. 6 and 9, a stator 140 of the motor according to the present invention may be formed in a circular shape. Corresponding to the shape of the stator 140, at least some portion of the PCB 150 may be formed in a circular shape. As shown in FIG. 6 and 10, an upper portion of the PCB 150 may be formed in a circular shape, where the stator 140 is seated.

[140] A radius of the circular portion of the PCB 150 may be substantially same as that of the stator core 141. A large sized exterior of the PCB 150 may enlarge the size of the bracket 110. Hence, the entire size of the motor may be large. Accordingly, some portion of the PCB 150 may be formed in a circular shape to provide a compact sized motor.

[141] Furthermore, since the shape of the bracket 110 is corresponding to shape of the

PCB 150, exterior beauty of the motor may be enhanced.

[142] By the way, fin 143d is formed on a lower both opposite sides of the bobbin 143.

The fin 143d is electrically connected to the coil wound around the bobbin 143. Thus, the fin 143d is inserted in a hole 151 formed on the PCB 150 to connect the PCB 150 to the coil. Once the fin 143d is inserted in the hole 151 of the PCB 150, soldering may be performed for secure electrical connection.

[143] The fin 143d helps the stator 140 seated on an upper portion of the PCB 150 by using the bobbin 143, as well as electrically connects the PCB 150 to the coiLThus, the fin 143d is formed on the boss 143e to enlarge a contact section with the PCB 150 and to carry the weight of the stator 140.

[144] The boss 143e is formed in a lower portion of the outer wall 143c to maintain a distance between the PCB 150 and the stator core 141.

[145] By the way, a connector 160 is provided in a side of the PCB 150. A fin 161 is formed on an end of the connector 160 and the connector 160 is fixed to the PCB 150 through the fin 161, electrically connected to the PCB 150. the fin 161 is inserted in a hole 152 formed on the PCB 150 and the other end of the connector 160 is exposed outside of the motor, that is outside of the bracket 110, to be connected to an external power.

[146] Furthermore, a hall sensor 190 is provided on a portion of the PCB 150 corresponding to the position of the rotor 170. The hall sensor assembly 190 senses a rotation position or a rotational speed of the rotor 170 to control a rotation speed or torque of the rotor 170. Thus, a hole 153 is formed on the PCB 150 to fix the hall sensor assembly 190 and to electrically connect the hall sensor assembly 190 to the

PCB 150.

[147] Since the four teeth 142 are provided in the motor of the present invention, four portions to which four bobbins 143 are coupled are provided.

[148] As shown in FIGS 6 and 10, seme portion of the PCB 150 is formed in a circular shape. A predetermined number of the four portions are formed on a circular shaped portion of the PCB 150. As described above, this circular shaped portion is corresponding to the circular shape of the stator 140.

[149] To provide a motor having a compact size by lessening the size of the PCB 150, a predetermined number of holes 151 may be formed on an outermost portion of the circular shaped PCB portion. That is, a predetermined number of holes 151 may be formed on a circumference of the PCB 150. Since the strength of the portion having the holes 151 formed thereon is weak, there may be a malfunction when forming the holes 151 and damage of the holes 151 due to vibration and the like.

[150] For this, it is preferred that an extension part is extended outwardly on a portion having every hole 151 is formed. In other words, the extension part 154 secures a predetermined distance between the holes 151 and the outermost portion of the PCB 150, such that the strength of the PCB 150 is reinforced and the external shape of the PCB 150 is prevented from getting large. Furthermore, the extension part 154 enables the PCB 150 seated on the bracket 10 smoothly.

[151] A hollow 155 is formed on the PCB 150. The hollow 155 may be formed on a center of the PCB 150 and a stopper, which will be described later, is inserted in the hollow 155 to prevent interference between the rotor 170 and the PCB 150.

[152] Also, since the stopper is inserted in the hollow 155, the PCB 150 may be securely fixed to the bracket 110.

[153] Next, referring to FIGS. 7 and 8, the bracket 110 of the motor according to the present invention will be described in detail.

[154] As mentioned before, the bracket 110 of the present invention includes a lower bracket 120 and an upper bracket 130 coupled to each other to hold various components. The lower bracket 120 may include a mounting part 123 that mounts the motor 100 to various parts the motor applied to.

[155] The shape of the bracket 110 is corresponding to that of the PCB 150. The PCB 150 is seated within the bracket 110, more specifically within the lower bracket 120.

[156] A groove 124 corresponding to the extension part 154 may be formed on the lower bracket to seat the extension part 154 therein. This can make the position of the PCB 150 automatically adjusted when the PCB 150 is seated on the lower bracket 120, even

more securely.

[157] A step part 128, which will be described later, is formed on the lower bracket 120 to mount the stator to the lower bracket 120. The step part 128 is projected a predetermined distance from an inner wall of the lower bracket 120. Preferably, the groove 124 cuts some portion of the step part 128 to prevent the shape of the bracket large due to the groove 124.

[158] As shown in FIG. 7, the PCB 150 is mounted within the lower bracket 120. As described above, a stopper 155 is inserted in a hollow 155 formed on the PCB 150.

[159] Hence, the stator 140 is partition on the PCB 150, and the rotor 170 and the shaft

180 is provided within the stator 140.

[160] An end of the shaft 180 is rotatably supported by the bearing 126 provided in the lower bracket 120 and a thrust is supported, too. The other end of the shaft 180 is rotatably supported by the bearing 136 provided in the upper bracket 120. Here, the shaft is exposed outside through the through hole 137 to drive load.

[161] The shaft 180 is inserted in the rotor 170 to rotate as one body with the rotor 170, such that the rotor 170 is prevented frαn moving in a longitudinal direction of the shaft 180. This is shown in HG. 7.

[162] However, the rotor 170 might move in a longitudinal direction of the shaft due to vibration. This may cause interference between the rotor 170 and the PCB 150 and damage the PCB 150.

[163] Due to those problems, a stopper 125 may be formed and prevents the rotor 170 from moving toward the shaft 180. the stopper 125 may be projected to an inside of the bracket and may be formed as one body with the bracket.

[164] The stopper 125 formed as one body with the lower bracket is shown in FIGS. 6 and 7.

[165] Preferably, a stopper 135 may be formed in the upper bracket 130 as one body with the upper bracket 130, too. The rotor 170 may be provided between the both stoppers 125 and 135.

[166] Thus, the stopper 125 and 135 can prevent from interfere with the bracket 110 and the PCB 150 even though the rotor 170 might move toward the shaft 180.

[167] The stopper 125 and 135 may be projected in a cylindrical shape. This is because it is preferred that the stopper is corresponding to the rotor 170 having a cylindrical shape. Also, an upper surface of the stopper 125 and 135 is contacted with an upper or lower surface of the rotor 170. An outer or inner diameter of the stopper 125 and 135 should be determined for that.

[168] According to the motor of the present invention, the stator 140 is securely fixed within the bracket 110. For this, a step part 128 and 138 is formed on a lower and upper bracket 120 and 130, respectively.

[169] The stator 140, more specifically an outer circumferential surface of the stator core

141, is seated on the step part 128 and 138. Hence, as the upper bracket 130 is coupled to the lower bracket 120, the stator 140 is securely fixed between the step parts 128 and 138.

[170] Since the PCB 150 has been already seated on the lower bracket 120, it is difficult to form the step part 128 corresponding to the entire circumference of the stator core 141. Thus, the step part 138 may be formed corresponding to the entire circumference of the stator core 141. For this, it is preferred that an inner partition wall 139 is further formed within the upper bracket 130.

[171] Alternatively, an inner partition wall may be formed in the lower bracket, too. If then, a through hole (not shown) should be formed on the PCB 150 so that the inner partition wall may pass there through, thereby not preferred. Industrial Applicability

[172] Therefore, the present invention has following advantageous effects.

[173] According to the power device supplying a low pressure DC voltage to the motor by using an AC power, there is an advantageous effect that the simple replacement of parts can depressurize the AC power if an AC power is variable based on a region. Thereby, since an additional structure for increase an internal pressure of a coil and a switching element is needed, the production process and structure variation can be facilitated.

[174] Furthermore, since one power circuit can supply the power for driving the motor and the power for the motor control circuit, an auxiliary power supply means can be emitted. Thereby, there is another advantageous effect that production cost may be reduced as well as that a minimal size for a product may be possible.

[175] Also, the motor including the motor power device has following advantageous effects.

[176] First, the motor of the present invention can be fabricated without difficulties and the exterior of the motor is compact. Thus, there is an advantageous effect that space for the motor can be reduced to expand the area to which the motor is adapted.

[177] Second, the motor of the present invention reduces a leakage flux. Thus, there is another advantageous effect that motor efficiency is enhanced with least electricity loss.

[178] Third, the motor of the present invention has a further advantageous effect that it can minimize vibration due to reducing cogging torque and control the rotational speed of the shaft and torque smoothly.

[179] Finally, the motor of the present invention can prevent malfunctions which might be generated in the fabrication process or usage. Thus, there is a further advantageous effect that a motor having high reliability as well as high durability may be provided.