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JP4232323B2 |
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JP2009044908A |
To eliminate a high order error superposed on a rotation angle estimated when the rotation angle is estimated from an extended induced voltage estimated by the extended induced voltage estimating part 30 based on actual currents i, i and...
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JP2009044832A |
To improve the response of servo control at a time, when there is friction in a control object.A servo is controlled by using a back-step control system that does not have an integrator. Accordingly, the problem of the repetition of over...
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JP4228519B2 |
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JP4228517B2 |
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JP2009507455A |
A method for controlling a mechanically commutated electric motor, wherein the rotational angle of the output of said motor is determined by means of detection of the change in back electromotive force, when the electric motor commutates...
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JP4225862B2 |
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JP4227403B2 |
A speed sensor for an electric motor having a permanent magnet stator and a wound rotor detects the variation in the electric field of the rotor due to commutation by means of induction in a coil placed in the electromagnetic field of th...
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JP4225988B2 |
To provide a failure detection system of a DC motor for detecting the existence of disconnection failure without rotating the DC motor. The DC motor 5 is driven by an H-bridge circuit composed of switching elements 1-4. The H-bridge circ...
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JP4227124B2 |
A hot-swap circuit system for fan tray module includes a soft-start circuit module in charge of the power start of the fan tray module hot-plugged into an application system. The soft-start circuit module includes a capacitor and a field...
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JP2009033835A |
To provide a load drive control circuit which can retard malfunction of a load even if a fault occurs in the diagnostic wiring system.A three-bridge motor drive circuit 8 is provided with a system control circuit 9 performing general con...
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JP4221993B2 |
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JP4223501B2 |
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JP2009027794A |
To provide a rotating direction switching circuit for a DC motor to switch the rotation direction at high speed not mechanically but contactlessly, so that switching efficiency and reliability are improved and service life and a DC motor...
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JP4217845B2 |
The method for determining the rotational speed and/or the angle of rotation of mechanically commutated d.c. motors from the variation with respect to time of the ripple of the motor current occurring during commutation is supplemented a...
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JP2009022134A |
To provide a load drive control circuit capable of hardly causing a malfunction of a load even if a fault occurs in a wiring system in the circuit.A bridge type motor drive circuit 8 has a system control circuit 9 for collectively contro...
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JP4214494B2 |
The apparatus comprises a main circuit (14) for conducting electric current to the electric motor (12) during its normal operation. The main circuit includes a motor starter (20) and a current limiting switch assembly (30), connected in ...
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JP2009011141A |
To provide a load drive control circuit which can make it hard to cause the malfunction of a load at occurrence of a fault, even if the fault occurs in the wiring system within a circuit.A bridge type motor driving circuit 8 has a system...
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JP2009011137A |
To provide a driving device and a driving device for clock, in which the power consumption is reduced, and even when the power voltage drops, a predetermined rotating motion can be obtained.Since redundant drive current flowing through a...
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JP2009011031A |
To provide a load drive control circuit which can make it hard to cause the malfunction of a load.A three-bridge type motor driving circuit is provided with a Vout bridge circuit 8 only for the first motor M1, an Hout bridge circuit 9 on...
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JP4207365B2 |
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JP4206434B2 |
A motor control circuit (10) for a power tool includes a function switch (39) which has a first battery contact (40), a speed control contact (41), a bypass contact (42) and, a second battery contact (44) connected in that order in a lin...
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JP4206519B2 |
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JP4206800B2 |
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JP4206520B2 |
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JP2009001043A |
To provide an electric power steering apparatus generating a high voltage without using a booster circuit to drive and control an electric motor in an optimum condition.The electric power steering apparatus includes a steering operation ...
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JP2009005485A |
To provide a motor controller wherein a value of a dead time conventionally set as a fixed value can be corrected to a value appropriate to a temperature characteristic of a switching circuit component for supplying a motor with a drivin...
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JP2009005460A |
To provide a load drive control circuit which can make a status that an overcurrent flows into a semiconductor element in a circuit hardly occur even if a connecting terminal of the circuit is short-circuited to a positive pole of a powe...
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JP2008312416A |
To carry out motor control without requiring a detection signal output from a position sensor.A motor control circuit 31 includes a rotational speed command signal generating circuit 50 for generating a command signal of a target value o...
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JP4200357B2 |
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JP4200783B2 |
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JP4196395B2 |
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JP2008301687A |
To prevent a driver IC from being overheated by exactly detecting that an overcurrent flows into the driver IC in a disk device.A disk device 1 is provided with a spindle motor 3 for rotating a disk 2, a driver IC 6 for supplying a drive...
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JP2008301686A |
To prevent a motor drive circuit from being damaged when commutator segments of a motor are short-circuited in a motor controller.A motor controller 1 is provided with a motor 2, a motor driver IC3, a differential amplifier circuit 4, a ...
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JP4192620B2 |
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JP4193739B2 |
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JP4192460B2 |
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JP2008295118A |
To provide a disc drive which stops rotation of a DC motor 2 by determining a failure due to short-circuit which happens in the DC motor of the rotation drive source of a disc as quickly as possible.A control section 10 for controlling t...
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JP4191172B2 |
A technique for determining an alignment error of a Hall sensor location in a brushless DC motor drive, by measuring the back EMF waveform, preferably while the motor is coasting. According to the technique, an angular offset is calculat...
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JP4191509B2 |
To prevent wiper arm position control from being deviated due to the unevenness of a sensor position. A sensor magnet is provided at an output shaft at which a rotating angle is restricted between a lower limit position and an upper limi...
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JP2008543268A |
In order to control an electromotive drive, a control unit has control modules for controlling half-bridge end power stages. Two of the control modules are pre-configured for alternatively controlling a commutator motor or a brushless el...
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JP2008284216A |
To protect a motor and a circuit while reducing a power loss.The motor control system of the sewing machine is provided with: speed setting means 16 and 18 for indicating a rotation speed of a main shaft 14; a speed sensing means 41 for ...
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JP2008289225A |
To easily prevent the erroneous detection of an overcurrent caused by noise.A current of a motor coil is detected on the basis of a voltage generated by a resistor arranged at the grounding side of an H-bridge; a first source transistor ...
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JP4188444B2 |
The method involves using active filtering of the harmonics through a boost-converter. An inductive load is used as at least a part replacement of an inductance needed for the boost-converter. The load is a motor which is driven through ...
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JP4187831B2 |
The definition of conversion of a digital value in a PWM signal using an N-bit up/down counter is improved by increasing the dimension of the input datum to N+2 bits, using the two lsb of the N+2 input datum for selecting one among three...
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JP4187308B2 |
A multiple-wound, three-phase, variable speed motor 1 having N independent winding sets is driven by N inverters, each responding to 1/N of the torque and excitation current commands, and the torque current is limited as a function of N ...
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JP4184550B2 |
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JP2008278584A |
To provide a motor controller which properly controls the drive of a motor according to the heat generation state of a device, performs control for getting the effect of suppressing a temperature rise when the temperature of each part of...
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JP4181432B2 |
An operating mechanism for an electrical apparatus ( 10 ), in particular, for a hand-held machining tool, includes a storage ( 18, 20 ) for inputting of control data and/or a control program for controlling the electrical apparatus ( 10 ...
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JP2008265645A |
To provide an electric power steering device improved in steering feeling by properly avoiding the superimposition of noise on a torque sensor signal.This electric power steering device comprises: an electric motor 12 for transmitting a ...
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