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Patent Searching and Data


Matches 651 - 700 out of 22,564

Document Document Title
WO2003047083A3
The invention relates to a control device for operating a load circuit comprising at least one electric motor. The control device has a control stage, which generates a pulse-width modulated control signal, and has a power stage, which s...  
WO/2003/084044A2
A technique for reconstructing phase currents based on measurements of a DC bus current. Non-observable regions of DC bus current samples to reconstruct phase currents are reduced in size by using two phase space vector modulation. The n...  
WO/2003/077322A2
A block diagram of circuitry, including control circuits contained within package (33). Thus, MOSFETS (31) and (33) are provided with respective shoot-thru protection circuits (61) AND (62) respectively and with over current shut down ci...  
WO/2003/077408A1
A fully protected H-bridge for a d-c motor (30) consists of two high side MOSFETs and a control and logic IC on a first conductive heat sink all within a first package and two discrete low side MOSFETs. The entire bridge is controlled by...  
WO/2003/072388A1
A control system for individually controlling power from a single voltage source to a plurality of motors is described. A chopper circuit, in conjunction with the control system, generates drive−pulses, which operates the IGBT switchin...  
WO/2003/071669A2
The aim of the invention is to avoid the creation of narrowband stray radiation spectra caused by a pulse-width modulation control system (5) of a d.c. motor (1). To this end, switching means (8) are used to modulate the clock pulse freq...  
WO/2003/063323A1
The invention relates to a device for suppressing the radio-interference of an electric commutator, in particular a direct current motor (10). Said device comprises a rotor (12) that is supplied with current by means of brushes (14a, b) ...  
WO/2003/063334A1
A controller (10) using rectified AC voltage 820) to drive a DC motor (M). A first rectified produces a waveform (A) that passes through zero voltage in synchronization with the A.C. supply voltage (20). The first rectified voltage is ap...  
WO/2003/052921A1
Disclosed is a method and a circuit arrangement for carrying out a method to protect an electric motor (10) and/or a control circuit (12) thereof from an overload in an emergency operation mode. The inventive method and associated circui...  
WO/2003/050846A2
A selectively protected electrical system includes or operated with a power source(1514) , a load (1512), a power driver circuit (1506) for controllably transferring power from the power source (1514) to the load (1512), the power driver...  
WO/2003/047083A2
The invention relates to a control device for operating a load circuit comprising at least one electric motor. The control device has a control stage, which generates a pulse-width modulated control signal, and has a power stage, which s...  
WO/2003/044935A1
A control unit of controlling a direct-current load (M1), said control unit comprising a DC/DC bridge (B1) provided with controllable semiconductor switches (UT, UB, VT, VB, WT, WB) and having two bridge sections (B11, B12), one (B12) of...  
WO/2003/038985A2
Aspects of a current controlled motor amplifier system (100) are provided. These aspects include a current source motor amplifier (100) comprising current source means on each leg of a top half (102) of the H bridge configuration and swi...  
WO/2003/034582A1
The invention concerns a method for regulating an electric motor, the regulating being carried out in accordance with a loop having a gain less than 1, based on a difference between a set point signal of an operating parameter of the mot...  
WO/2003/030364A2
The invention relates to a control device for operating a load circuit provided with an inductive load (m), comprising a control stage (14) producing a pulse-width modulated control signal with measuring disconnection intervals provided ...  
WO2002051592A8
A speed controller operates a DC-powered fastener drive assembly to efficiently drive fasteners from a DC power supply (22), thereby achieving a fully portable hand tool. In particular, the speed controller accelerates a flywheel (28) wi...  
WO/2003/028201A1
A reversible DC motor drive (440) includes a DC/DC converter (60) having a DC input (66,68), a first output (78) having a first pulsed DC voltage and first DC voltage value, a second output (102) having a second pulsed DC voltage and sec...  
WO/2003/026122A1
Deviation can be reduced in a steady decision region at the time of controlling a servo mechanism by detecting a fact that servo control entered the steady decision region of a target position and making the control constant (PI value) v...  
WO2002086647A3
The invention relates to an arrangement for automatically influencing a mains supply. A voltage transformer is provided as a pilot transformer which detects the real value of the voltage which is to be adjusted and which transmits said v...  
WO/2003/012970A1
A method and apparatus for controlling power supplied to a motor (60), comprising a power controller (58) having a source of electrical power (52) for providing the necessary power to operate the apparatus (50), an oscillator (56) for ge...  
WO2002043236A3
A circuit to bypass the Zener diodes in the flyback circuit of a DC brush motor actuator which uses a voltage sensitive device to detect when the power to the motor is de-activated to control a switch that short circuits the Zener diodes.  
WO/2003/007467A1
A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying...  
WO/2003/003545A1
A meter unit (45) is provided with a signal processing circuit (26) for processing the output signal from detecting sections (24, 25), and a rectifying circuit (30) of a DC low voltage power supply section (28) for driving the signal pro...  
WO/2003/003556A2
The aim of the invention is to produce, in the most economical way possible, a control device for DC motors that are provided with a commutator for feeding the motor windings that has at least four sliding contacts. Said control device c...  
WO/2002/097448A1
This invention relates to a method for determining the frequency of the current ripple contained in the armature current signal of a commutated d.c motor. Said frequency is determined by calculating the difference between the result obta...  
WO/2002/097962A1
The invention relates to a method for determining the rotational position of the drive shaft of a commutated DC motor by evaluating the digitized current ripples contained in the armature current of the DC motor. The inventive method is ...  
WO/2002/097449A1
A method for correcting the determination of the rotational position of a commutated d.c. motor drive shaft, by evaluating the current ripple contained in the armature current signal when double or missing ripples occur. The method is ch...  
WO/2002/095924A1
A method for determining the rotating position of the drive shaft of a commutated direct current motor by evaluation of the current ripple contained in the armature current signal when erroneous ripples occur; if no other current ripple ...  
WO/2002/094636A1
The invention relates to a method of interrupting the stator winding circuit of a synchronous electric motor (1) with n phases (n $m(G) 2) comprising at least n 1 relays (2a, 2b) which are each connected to a different phase. According t...  
WO/2002/095925A1
A method for determining the rotating position of the drive shaft of a commutated direct current motor by evaluation the current ripple contained in the armature current signal, wherein the metered result of the detected current ripple i...  
WO/2002/091560A1
The invention relates to a drive unit, particularly for a blower in motor vehicles. The drive unit comprises an electric motor (12), which operates on a d.c. mains (U¿Bat?), and comprises a device (13) for controlling the rotational spe...  
WO/2002/089308A1
The invention relates to a control for a half-bridge, particularly for actuating the electric motors, which comprises a first electronic switch arranged between a supply and a phase tap and a second electronic switch arranged between the...  
WO/2002/086647A2
The invention relates to an arrangement for automatically influencing a mains supply. A voltage transformer is provided as a pilot transformer which detects the real value of the voltage which is to be adjusted and which transmits said v...  
WO/2002/071593A1
The invention relates to a circuit arrangement for supplying a direct current machine, comprising an armature winding (14) and a field winding (11). According to the invention, the field winding (14) is connected to a phase (7) of the sa...  
WO2002050618A3
A power generation system is disclosed having several embodiments such as in one embodiment, the power generation system includes a fuel source to provide fuel, a turbogenerator (200), coupled to the fuel source, to generate AC power, an...  
WO/2002/051591A1
A control module (18) advantageously reduces cost and enhances reliability, design flexibility, ease of assembly, and performance of a flywheel operated hand tool (10). The control module (18) includes a thin film printed circuit with no...  
WO/2002/051592A1
A speed controller operates a DC-powered fastener drive assembly to efficiently drive fasteners from a DC power supply (22), thereby achieving a fully portable hand tool. In particular, the speed controller accelerates a flywheel (28) wi...  
WO/2002/050618A2
A power generation system is disclosed having several embodiments such as in one embodiment, the power generation system includes a fuel source to provide fuel, a turbogenerator (200), coupled to the fuel source, to generate AC power, an...  
WO/2002/049202A1
A PWM control unit which outputs to a power supply unit a PWM signal matching a PWM target value for the servo-control of a dc motor, and which comprises a synchronous control unit, a PWM operation unit, a PWM target value selection unit...  
WO/2002/043236A2
A circuit to bypass the Zener diodes in the flyback circuit of a DC brush motor actuator which uses a voltage sensitive device to detect when the power to the motor is de-activated to control a switch that short circuits the Zener diodes.  
WO/2002/037662A1
The invention relates to the circuit arrangement of an electromotor comprising two terminals, in which the electromotor can be actuated for operation in both rotational directions. When no current is supplied to the electromotor, one of ...  
WO/2002/037646A1
A closed loop control system for a electromagnetic clutch or brake (312) has a motor to provide force, a transducer (304) to read the force and produce an error signal, and an amplifier (311) to compare the error signal to a reference si...  
WO/2002/034587A1
The invention relates to a contact washer system, comprising a rotatable contact washer (10) and several contact elements (12, 14, 16, 18), the contact washer (10) having a plurality of paths (20, 22) and each contact element (12, 14, 16...  
WO2000070738A3
The invention relates to a method for controlling at least one inductive consumer by means of a pulse width modulated control signal using a PWM control unit, wherein the control pulses of the PWM control signals connect and disconnect t...  
WO/2002/027955A1
Disclosed is a circuit and method for preventing erroneous opening and closing caused particularly, by use of a DC motor in an automatically/manually foldable portable radio terminal having a main body and a sub-body rotatable with respe...  
WO/2002/023710A1
Disclosed is a pole-change type motor that provides a variable-speed (two-pole or four-pole type) operation system capable of reducing the load of the motor of the normal operation system and improving the cooling efficiency. In case of ...  
WO/2002/023736A1
A circuit (12) for recovering a current sense signal which is offset by a common mode displacement, such is the case when the signal is the voltage across a current sense resistor located on the high side bus or between the switches of a...  
WO2001084063A3
A cooling system for a vehicle includes a shroud attachable to a fixed portion of the vehicle. A stator assembly (23) for a brushless DC ring motor is attached to at least one mounting support of the shroud (16). A cooling fan (14) is pi...  
WO2001022095A8
The invention relates to a method for regulating the rotational speed of a motor, to which a digital governor is assigned and which during operation generates an actual value signal for the rotational speed in the form of a rotational sp...  
WO2000035689A3
The invention relates to a method for operating an actuating drive of a motor vehicle with different vehicle electric system voltages, whereby the actuating drive is connected to the vehicle electric system in order to operate an actuati...  

Matches 651 - 700 out of 22,564