DC motor stop detector and DC motor brake apparatus

Details DC motor stop detector and DC motor brake apparatus DC motor stop detector and DC motor brake apparatus

1989-07-20

1990-05-15

Ro, Bentsu

Electricity: motive power systems

Braking

'plugging' or application of reverse power to motor

318282, 318293, H02P 310

Patent

active

049261010

ABSTRACT:
A DC motor is supplied, from a motor driver, with a brake voltage constituted by a forward drive voltage, a reverse drive voltage, and a stop voltage of a zero potential level. An operational current of the motor driver is supplied to a low-pass filter whose output is supplied to first and second sample and hold (S/H) circuits. The first S/H circuit performs its sampling operation after a minute period of time in which the brake voltage goes through a polarity inversion from the reverse drive voltage to the forward drive voltage. The second S/H circuit performs its sampling operation after a minute period of time in which the voltage applied is changed from the forward drive voltage to the reverse drive voltage. The outputs or sampled values of both S/H circuits are compared with each other by a comparator. When the sampled values equal each other, i.e., when the number of rotations of the motor becomes zero, the comparator outputs a coincidence pulse. This pulse is supplied to a stop detector. When detecting this coincidence pulse a predetermined number of times in a row, the stop detector determines that the number of rotations of the motor has become zero.

REFERENCES:
patent: 3518517 (1970-06-01), Rainer
patent: 4438378 (1984-03-01), Tanaka
patent: 4460857 (1984-07-01), Michaelis
patent: 4477751 (1984-10-01), Kanayama
patent: 4549120 (1985-10-01), Banno et al.
patent: 4629949 (1986-12-01), Senso
patent: 4833378 (1989-05-01), Furue et al.

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