Stop control circuit for brushless DC motor

Details Stop control circuit for brushless DC motor Stop control circuit for brushless DC motor

1981-06-04

1984-03-20

Dobeck, B.

Electricity: motive power systems

Switched reluctance motor commutation control

318258, 318369, H02K 2902

Patent

active

044383770

ABSTRACT:
A stop control circuit for a DC motor causes the motor to stop precisely by purely electrical action. A DC motor is provided with a bidirectional driving circuit, a servo circuit for controlling the driving circuit, and a rotation detector associated with the motor shaft to provide a phase signal that depends, in magnitude and polarity, on the particular rotational angle of the shaft, regardless whether the motor is turning. A stop control circuit then includes an amplifier whose output varies according to the phase signal, and a switch that normally provides the servo signal to the driving circuit, but, upon command, switches over to provide thereto the output of the amplifier as a brake signal. Alternatively the rotation detector can include two sensor elements separated by .pi./2, and the stop control circuit can include an inverting amplifier, a non-inverting amplifier coupled to one of the sensor elements, and a switch circuit with inputs coupled respectively to these amplifiers. A comparator provides a switch signal to the switch circuit in dependence on the phase signal from the other sensor element. In another embodiment, a differential amplifier provides a brake signal in dependence upon both the phase signals from the two sensor elements.

REFERENCES:
patent: 3571683 (1971-03-01), Prezzi et al.
patent: 3596160 (1971-07-01), Rakes
patent: 3600659 (1971-08-01), Danchuk
patent: 3928836 (1975-12-01), Makino et al.
patent: 3946292 (1976-03-01), Tanikoshi
patent: 4053829 (1977-10-01), Maruo
patent: 4070606 (1978-01-01), Morozumi et al.
patent: 4079360 (1978-03-01), Ookubo et al.

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