Sensorless brushless DC motor

Details Sensorless brushless DC motor Sensorless brushless DC motor

1998-02-05

1999-03-23

Wysocki, Jonathan

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02P 700

Patent

active

058864865

ABSTRACT:
A control circuit and method for controlling a sensorless brushless DC motor are provided which are capable of effectively filtering noise. The control circuit includes: a phase voltage measuring unit for determining the voltage of each phase from the terminal voltages of the stator coils; a phase voltage sign detecting unit for detecting the sign of the phase voltage measured from the phase voltage measuring unit and outputting a phase voltage sign signal; and a digital phase-shifter for generating a delay signal which is delayed up to 90.degree. with respect to the phase voltage sign signal and supplying the delayed signal to the commutation unit.

REFERENCES:
patent: 3906320 (1975-09-01), Doemen
patent: 4752724 (1988-06-01), Radziwill et al.
patent: 5202614 (1993-04-01), Peters et al.
patent: 5397971 (1995-03-01), McAllister et al.
patent: 5506487 (1996-04-01), Young et al.

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