Single-phase brushless motor with cogging features

Details Single-phase brushless motor with cogging features Single-phase brushless motor with cogging features

1986-10-24

1988-04-19

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 318254, H02K 3700, H02K 2908

Patent

active

047392037

ABSTRACT:
A single-phase brushless motor which can rotate smoothly by a uniform torque over an entire range of rotation with reduced torque ripples, without generating a high cogging torque for allowing self-starting of the motor. The motor comprises a field magnet as a rotor having 2P north and south magnetic poles, either the north or the south poles having a width equal to an electrical angle of about 120 degrees while the other poles have a width equal to an electrical of about 240 degrees. The field magnet is mounted for rotation in an opposing relationship to a stator armature core which has a plurality of radially extending stator poles formed in a circumferentially equidistantly spaced relationship thereon. A plurality of stator coils for two phases are wound selectively on the stator poles. An electric circuit detects the position of the field magnet to energize the armature coils for the two phases alternately for an electric angle of about 180 degrees.

REFERENCES:
patent: 4217508 (1980-08-01), Uzuka
patent: 4499420 (1985-02-01), Shiraki et al.

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