Method and apparatus for synchronous driving of the phase windin

Details Method and apparatus for synchronous driving of the phase windin Method and apparatus for synchronous driving of the phase windin

1997-03-31

1998-06-09

Ro, Bentsu

Electricity: motive power systems

Synchronous motor systems

Synchronization systems

318439, 318721, H02P 618

Patent

active

057640203

ABSTRACT:
Synchronization of the phase switchings in driving a brushless motor with predefined excitation current profiles of substantially nonconstant value, is improved by continuously correcting the rotor position information detected by zero-cross detecting circuits with an updatable delay value. A switching delay counter is started by the raw zero-cross pulse to determine the generation of a corrected synchronization pulse. The delay counter is downloaded with a constantly updated value by monitoring the correction signal produced by a speed control loop and by incrementing or decrementing the downloaded value in the counter to minimize the correction signal.

REFERENCES:
patent: 4431953 (1984-02-01), Schray et al.
patent: 4874993 (1989-10-01), Tanaka et al.
patent: 5130620 (1992-07-01), Inaji et al.

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