DC motor driving apparatus with function for compensating for dr

Details DC motor driving apparatus with function for compensating for dr DC motor driving apparatus with function for compensating for dr

Filed on

1988-12-14

Date issued

1990-08-21

Examiner

Ro, Bentsu

Patent Class

Electricity: motive power systems

SubClass

Positional servo systems

SubSubClass

Pulse-width modulated power input to motor

Other Related Categories

318254, H02P 517, H02P 602

Type

Patent

Status

active

Patent number

049509683

Description

ABSTRACT:
A motor driving apparatus disclosed herewith is designed in such a way that a drive current is supplied through a switching circuit to a DC motor, such as a three-phase brushless motor, from a DC power source and the rotational speed and phase of a signal has a frequency proportional to the rotational speed of the DC motor are detected by a rotational speed detector and a phase detector. Signals detected by the speed detector and phase detector are respectively supplied to a speed comparator and a phase comparator for comparison with the respective predetermined values. The comparison results are then added and the resultant signal is sent to a subtracter. The applied voltage of the DC motor which has undergone ON/OFF control in a switching circuit is detected by a voltage detector, and the detection signal is subtracted from the added signal in the subtracter, and the resultant signal is supplied as a control signal to a signal generator. This signal generator changes the ratio of the ON/OFF signal supplied to the switching circuit in accordance with the control signal from the subtracter, whereby the ON/OFF time of the switching circuit is controlled to thereby control the rotational speed and phase of the DC motor.

REFERENCES:
patent: 4368411 (1983-01-01), Kidd
patent: 4651068 (1987-03-01), Meshkat-Razavi
patent: 4686437 (1987-08-01), Langley et al.
patent: 4749927 (1988-06-01), Rodal et al.
Toshiba TA7712P, pp. 198-206.
Toshiba TA76494P, pp. 370-374.
Toshiba TC9142), pp. 355-368.

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