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JP2000236684A |
To prevent breakdown of source-side transistors, when a motor is braked. This motor is constituted such that when a brushless motor in forward rotation course is made to rotate in the reverse direction, source-side and sink-side transist...
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JP2000231753A |
To start a spindle motor without producing noise or dust even when a magnetic disk can not be started because of the load of adhesion between the magnetic disk and a magnetic head, by overcoming a load applied by this adhesion or the lik...
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JP3079813B2 |
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JP2000228898A |
To provide a group operation control method for a synchronous motor, capable of attaining both reliability and economical efficiency of a system. A plurality of synchronous motors 51-5n are started, so that each rotational speed increase...
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JP3075344B2 |
To reliably start a fan with a minimum circuit scale. Fan capacity control resistors 12-1, 12-2 are put in connection between a power source line 11 and power source supplying terminals of DC fans 13-1, 13-2 respectively and the flow rat...
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JP2000224758A |
To provide a motor driving control circuit for driving a motor under control accurately without erroneous operation. A rotating state and a locked state of a motor (M) are detected by a tacho-generator TG, and power continuity or power b...
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JP2000224759A |
To provide a motor driving control circuit for driving a motor under control accurately without erroneous operation. A motor driving control circuit includes a lead relay (L) or the lead relay (L) and a relay circuit, in which a first dr...
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JP2000221858A |
To make a motor reach a target rotating speed quickly after the start of rotation or after the switching of a rotating speed by using a first rotating-speed-detection-means until the motor reaches the target rotating speed, using a secon...
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JP2000217387A |
To make a smooth transition to sensorless operation by measuring the voltage being induced in the stator winding when a decision is made that a fan motor is rotating and starting the motor through sensorless operation if the voltage or f...
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JP2000211429A |
To increase satisfactory operation of a circuit and the durability of a positive-characteristic thermistor. A resistor RO is connected to a relay coil RC in parallel. Relay coil applied voltage ER is separated from resistor applied volta...
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JP2000209773A |
To provide a protective device for rush current, etc., which can prevent malfunctions of a plurality of electrical appliances by eliminating load-side stresses caused by a rush current, etc., through control of loads caused by the AC pow...
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JP2000207822A |
To realize stable starting by suppressing a sudden fluctuation of rotational torque applied to an optical disk during the operation of switching from a constant voltage control to a constant linear speed control. This spindle motor contr...
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JP2000209884A |
To provide a variable speed device which does not require external circuit for the generation of a variable speed command and can automatically change set values for level discrimination and the number of revolutions and direction of rot...
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JP2000209883A |
To ensure a constant relay function time at all times by inserting a delay circuit between a button and the relay coil of a relay circuit and delaying function of the relay circuit on the button operation side when the button is switched...
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JP3067898B2 |
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JP2000201490A |
To provide a driving circuit which can operate a three-phase induction motor without stoppage when the power supply is instantaneously interrupted. When power supply is interrupted, but restored within a fixed period of time (0.5-1 secon...
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JP3066216B2 |
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JP2000197383A |
To provide a method for determining the rotor position of a polyphase switching reluctance machine comprising a rotor, a stator, and an energizable winding having more than one phase. The ASCIC 57 in a controller 54 controls a switch 50 ...
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JP2000197380A |
To provide a circuit structure that is suitable for a control unit integrated motor where an electric motor and a control unit are formed in to a single piece. If a straight line that passes through a rotary center O of a motor and exten...
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JP3063229B2 |
A synchronous motor includes a unitary rotor, a first stator (10), a second stator (14) and phase-changing switches (20). The unitary rotor has a first rotor portion formed by a first permanent magnet (2) and a second rotor portion forme...
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JP3064648B2 |
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JP3062522B2 |
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JP2000175488A |
To make a grounding device for motor start system which is usable at both the start time and normal operating time of a motor.The grounding fault of a motor 8 at both the start time and normal operating time is commonly detected by means...
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JP2000166279A |
To accurately detect a load current by eliminating the dead zone region where current cannot be detected according to the input offset voltage of an operational amplifier.A current detection circuit shifts an input offset voltage Vos of ...
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JP2000166289A |
To provide an electric motor control device for preventing an electric motor or a variable speed drive control device from being damaged or tripped by overheating.An electric motor control device is provided with an electric motor temper...
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JP3050851B2 |
To realize high reliability and compactness by positively performing shift from the start operation to synchronous operation by controlling an operation transfer switch from a star operation circuit to a synchronous operation switch, whe...
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JP2000152586A |
To reduce the maximum starting current of a DC motor which has four or more brushes around an armature substantially in comparison with the maximum starting current of a conventional constitution with simple structure. A DC motor has fou...
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JP3041614B1 |
A current detecting apparatus comprises a determining unit which determines whether the electric potential of a first node or a second node is in a predetermined range. When the condition that the electric potential is not in the predete...
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JP2000134716A |
To diagnose a torque comparing function, when a vehicle is started without causing vehicle behavior. When both a main microcomputer 21 and a sub-microcomputer 31 diagnose a torque comparing function at starting of an electric vehicle, a ...
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JP2000134982A |
To provide a method for starting a spindle motor and a device utiliz ing it which enables the motor to start well even in the spindle motor having the number of poles and slots in the ratio of 4:3, which is liable to cause a starting fai...
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JP2000134901A |
To provide a permanent magnet motor having a stator core which facilitates positioning at a starting up of its rotor. In the peripheral brim of a stator core 6 outside a rotor inserting hole 3, a pair of cutouts 7a, 7b which enable conce...
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JP2000130299A |
To prevent an intermittent operation for thermally damaging a starter by starting time registering action after judgment is performed with a key switch operation in order to measure a lapsed time, and inhibiting an operation of the start...
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JP2000125579A |
To provide a prime motor starting device capable of positively-limiting current, so as to prevent a starter motor from being overloaded at initial start.This prime mover starting device is provided with a starter motor 4 for driving the ...
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JP2000116177A |
To avoid failure in starting by discriminating whether or not a motor is rotated by external disturbance such as natural wind through a rotor position detecting signal from a rotor position detecting means when a DC motor for driving a f...
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JP2000116178A |
To reduce dead time of electric power in a soft start by starting a rotor with a control signal having a duty ratio which increases gradually at regular intervals from the initial value of, that is, a prescribed duty ratio for minimum st...
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JP2000116164A |
To obtain a star-delta starting apparatus, in which an rush current generated in a changeover operation is suppressed effectively by a method, wherein in a closed-circuit transition system, the value of a start resistance used to changeo...
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JP2000102273A |
To positively conduct control of turning off the electricity of a motor at changeover of the forward and reverse directions by hardware configuration, on the basis of a rotational-direction signal output by port operation through softwar...
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JP2000092879A |
To provide a motor drive capable of reducing the capacities of a converter and a motor for cost reduction, by eliminating intermittent commutation at the start of low-speed, increasing the developed torque of the motor, and improving the...
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JP2000092878A |
To reduce power loss, which is caused by a semiconductor device for power, by maintaining a switching element corresponding to one phase in the conductive condition during the predetermined switching period and moreover controlling a swi...
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JP2000087967A |
To provide a magnetic bearing device wherein electric power consumption is lessened by using partial active control, and a controller is easily designed. A supporting method of a bearing is switched by a bearing supporting method switchi...
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JP2000085470A |
To provide an outside mirror device for an automobile reducing load applied to a gear train for transmitting the driving force of a motor. A worm gear 21 impeding the transmission of rotational force applied from a main gear 12 is used a...
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JP3025589B2 |
PURPOSE: To start/stop a three-phase induction motor smoothly by connecting a voltage transducer between the I/O terminals of a static switch arranged for each phase and providing a firing controller, an electromotive force detector and ...
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JP3026639B2 |
PURPOSE: To prevent the influence of arc,discharges between relay contacts to a positive-temperature coefficient thermistor and heating of the thermistor by a compressor by fitting the case of the thermistor to the surface of a bobbin op...
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JP2000080985A |
To stably supply water from start of use by constituting shift means of a motor by an inverter of a serial signal specification, and transmitting and accelerating/decelerating time according to a region to which frequency belongs and an ...
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JP3019485B2 |
PURPOSE: To obtain an accurate speed coincidence signal even if the actual speed of an induction motor does not coincide with a frequency command due to the fact that a load state is larger than an expected amount when the motor is drive...
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JP2000073655A |
To prevent the excess heat generation of a motor, and to obviate the stoppage of the motor as a foreign matter is left as it is pinched. When the pinching of a foreign matter is sensed, the movement of a window pane is not stopped even w...
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JP2000069774A |
To protect relay contacts from overcurrent a motor being driven is inverted. When a motor 33 is being forward driven with polarity changing signals SA and SB at HIGH level and LOW level, respectively, the capacitor 40 in a drive limiting...
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JP2000064711A |
To move down a window glass even when a vehicle is submerged by providing a down-motion back up circuit which turns off an up/down drive circuit and forcibly drives a down-drive relay. An autoswitch 12 and a manual switch 14 output up/do...
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JP2000060180A |
To provide an inverter device which restarts an induction motor without generating overcurrent overvoltage. A pulse generator 2, which outputs a pulse signal in a fixed period which is proportion to the rotation of an induction motor 1, ...
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JP2000053358A |
To start a motor without any magnetic pole sensor and control an adequate rotor angle synchronous with a magnetic pole position of a rotor, by providing a device for detecting synchronousness of rotation speed of a rotor with speed comma...
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