Arrangement for generating drive signals for a multi-phase d.c.

Details Arrangement for generating drive signals for a multi-phase d.c. Arrangement for generating drive signals for a multi-phase d.c.

1997-11-24

1999-09-07

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

H02P 1118

Patent

active

059492031

ABSTRACT:
An arrangement for generating drive signals for a multi-phase d.c. motor having a plurality of windings, comprising a multi-phase inverter (10) which supplies the drive signals to the windings of the motor in a manner such that the windings are recurrently energized by the drive signals in a given sequence. At least one of the windings is not supplied with a drive signal at least during predetermined free periods. A phase detector (40) which, under control of the multi-phase inverter, samples the back-emf signals of these windings in order to obtain a phase-error signal. A low-pass filter (42) generates a control signal dependence upon the phase-error signal, and a controllable oscillator (44) generates a frequency signal whose frequency depends on the control signal. The timing of the multi-phase inverter drive signals supplied to the motor windings depends on the frequency signal. A phase-locked loop is formed by the multi-phase inverter, the phase detector, the low-pass filter and the oscillator. A lock detector (70) which, on the basis of information about the frequency and phase of the phase-error signal and information about the frequency and phase of the frequency signal, determines whether or not the phase-locked loop is locked in phase.

REFERENCES:
patent: 4724402 (1988-02-01), Ireland
patent: 4928043 (1990-05-01), Plunkett

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