Single phase brushless motor with a core

Details Single phase brushless motor with a core Single phase brushless motor with a core

1986-10-17

1988-04-12

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 318254, H02K 3700, H02K 2908

Patent

active

047376740

ABSTRACT:
A cored single-phase brushless motor including a single position-detecting element can start itself without provision of a special cogging generating means. A field magnet as a rotor of the motor has alternate north and south magnetic pole zones, one of which has a width equal to an electrical angle of about 120 degrees while the other has a width equal to an electrical angle of about 240 degrees. A stator armature core has stator poles formed in a circumferentially equidistantly spaced relationship thereon and having a width equal to an electrical angle of about 120 degrees, and armature coils are wound on the stator poles. A position-detecting magnet rotor is formed on the field magnet, and a magnetic sensor detects a north, south magnetic pole or non-magnetized zone of the magnet rotor, to detect the position of the field magnet. An electric current successively energizes, in response to signals from the magnetic sensor, the armature coils for an electrical angle of 120 degrees to rotate the rotor.

REFERENCES:
patent: 4072881 (1978-02-01), Ban
patent: 4217508 (1980-08-01), Uzuka
patent: 4494028 (1985-01-01), Brown
patent: 4499420 (1985-02-01), Shiraki et al.

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