Control circuit for brushless electric motor

Details Control circuit for brushless electric motor Control circuit for brushless electric motor

1988-04-15

1989-05-23

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02P 602

Patent

active

048333743

ABSTRACT:
A control circuit for a brushless electric motor includes a pulse width modulator for applying drive signals to a gate drive circuit according to from a current amplifier, multi-phase drive coils connected to the gate drive circuit through an inverter circuit, a comparator connected to the current amplifier, a flip-flop for applying output signals from the comparator and drive signals form the pulse width modulator, and a circuit portion for applying signals for switching the direction of rotation from the flip-flop to the gate drive circuit. A preceding signal for switching the direction of rotation is maintained in the flip-flop until the dead zone of the pulse width modulating circuit is elapsed and a new signal for switching the direction of rotation is generated in synchronism with a pulse signal produced by the pulse width modulating circuit so as to be supplied to the gate drive circuit.

REFERENCES:
patent: 4641066 (1987-02-01), Nagata et al.
patent: 4665350 (1987-05-01), Angi et al.
patent: 4749923 (1988-06-01), Chieng

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