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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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JP2008271669A |
To provide a motor control device which can detect the generation of a spark with high detection accuracy by an inexpensive constitution, does not impart a feeling of discomfort and a sense of anxiety to a user by smoke and odors which l...
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JP4177387B2 |
A motor control apparatus can protect circuit elements in an appropriate manner while preventing an incorrect abnormality determination when a motor is in regeneration operation, etc. The apparatus includes a target current calculation s...
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JP4175076B2 |
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JP2008263752A |
To provide a drive controller with simple structure for detecting the occurrence of overcurrent on a load.One end of the field winding of a motor 2 coupled to the fuel pump of a vehicle is connected to a vehicle power supply 4 and the ot...
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JP2008263756A |
To control a motor by PWM control for obtaining satisfactory follow-up performance in an adjustable-speed region.A proportional element 461 outputs a value, where the speed deviation between target rotational speed and rotational speed i...
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JP2008263766A |
To provide a method for detecting and controlling the output characteristics of a DC motor, and a self-propelled device using the method.An input current resistance for driving mainly a DC motor is measured and the output characteristics...
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