Motor control circuit

Details Motor control circuit Motor control circuit

1990-01-12

1991-04-23

Ro, Bentsu

Electricity: motive power systems

Braking

'plugging' or application of reverse power to motor

318374, 318254, H02P 310

Patent

active

050102834

ABSTRACT:
A motor control circuit provides reduced stopping time. The circuit utilizes n rotational signals whose relative phase differences are proportional to the rotational speed of the motor. Inverted logic signals are formed of these n signals. Circuitry for discriminating the direction of the motor and for determining from the n signals n-1 and/or n inverted signals, the initial change of any of the signals following a reversal of the motor. Upon determining the initial change, a signal is supplied to the motor drive circuit to cause the motor to de-energized. A specific circuit for holding the motor in a stopped condition is disclosed.

REFERENCES:
patent: 3895277 (1975-07-01), Klumpp
patent: 4054819 (1977-10-01), Johnson
patent: 4549120 (1985-10-01), Banno et al.
patent: 4629949 (1986-12-01), Senso
patent: 4742282 (1988-05-01), Okutani et al.
patent: 4779260 (1988-10-01), Kaneko et al.
patent: 4833378 (1989-05-01), Furue et al.
patent: 4864211 (1989-09-01), Kawaguchi
patent: 4926101 (1990-05-01), Enomoto et al.

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