Brushless DC motor without a position sensor

Details Brushless DC motor without a position sensor Brushless DC motor without a position sensor

1991-01-29

1992-07-14

Wysocki, A. Jonathan

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02P 600

Patent

active

051306204

ABSTRACT:
A full wave drive brushless DC motor system detects zero-crossing points of counter electromotive forces respectively induced by the stator windings, and then pulse-shapes the thus detected zero-crossing points to obtain a pulse signal train, and then measures the thus obtained period of the pulse signal train to determine a conducting phase of the stator windings in response to the thus counted period. The system is thereby capable of supplying an electric current bidirectionally to each of the stator windings without using a position sensor for detecting a position of a rotor.

REFERENCES:
patent: 4103216 (1978-07-01), Hayes
patent: 4119901 (1978-10-01), Leenhouts
patent: 4220904 (1980-09-01), Leenhouts et al.
patent: 4429268 (1984-01-01), Yajima et al.
patent: 4480218 (1984-10-01), Hair
patent: 4684866 (1987-08-01), Vehmer et al.
patent: 4780651 (1988-10-01), Nakano et al.
patent: 4874993 (1989-10-01), Tanaka et al.
patent: 4928043 (1990-05-01), Plunkett
patent: 4978895 (1990-12-01), Schwarz
"Pulsewidth Multiplier Uses Up/Down Counter", Electronic Engineering, Apr. 1984, Great Britain.

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