Drive circuit supplying drive signals to a plurality of windings

Details Drive circuit supplying drive signals to a plurality of windings Drive circuit supplying drive signals to a plurality of windings

1997-01-22

1999-01-12

Ip, Paul

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 318560, 360 7308, H02P 602

Patent

active

058595120

ABSTRACT:
A drive circuit for supplying drive signals to a plurality of windings of a multi-phase d.c. motor. The drive circuit comprises a multi-phase inverter which supplies the drive signals to the motor windings; a phase detector which samples the back-emf signal of a winding in order to obtain a phase-error signal; a low-pass filter which generates a control signal dependent upon the phase-error signal; and a controllable oscillator which generates a frequency signal whose phase and frequency depend on the control signal. The timing with which the multi-phase inverter supplies the drive signals to the windings is dependent on the frequency signal. The drive circuit further comprises a masking circuit for temporarily inhibiting the further processing of the phase-error signal by the low-pass filter, at least during the presence of a flyback signal in the phase-error signal, as a result of which the processing of the flyback pulses present in the phase-error signal is inhibited.

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