Electronically commutated motor having an increased flat top wid

Details Electronically commutated motor having an increased flat top wid Electronically commutated motor having an increased flat top wid

1989-03-27

1990-08-21

Roskoski, Bernard

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 310156, H02K 3700

Patent

active

049509608

ABSTRACT:
An electronically commutated motor is disclosed including a stationary assembly having a plurality of winding stages adapted for commutation in at least one preselected sequence and a rotatable assembly having a plurality of permanent magnet elements in magnetic coupling relation with the stationary assembly. The permanent magnet elements are adapated to sequentially apply a magnetic field having a substantially constantly increasing magnetic flux to each respective winding stage during the period that current is supplied to the respective winding stage as the rotatable assembly rotates. The permanent magnet elements are also adapted to sequentially apply a magnetic field having a substantially constantly decreasing magnetic flux to each respective winding stage during a period that current is not supplied to the respective winding stage as the rotatable assembly rotates. A rotatable assembly, a method of operating the motor, and a method of rotating the rotatable assembly are also disclosed.

REFERENCES:
patent: 4211963 (1980-07-01), Muller
patent: 4237397 (1980-12-01), Mohr et al.
patent: 4724350 (1988-02-01), Shiraki et al.
patent: 4751416 (1988-06-01), Torok

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