Permanent magnet motor having high starting torque and narrowly-

Details Permanent magnet motor having high starting torque and narrowly- Permanent magnet motor having high starting torque and narrowly-

1984-09-27

1986-03-11

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, 310156, 310186, 310190, H02K 3700

Patent

active

045756520

ABSTRACT:
A permanent magnet motor having a highly nonuniform reluctance gap between rotor and stator creating reluctance torque which aligns the rotor in narrowly-defined detent zones when the motor coils are de-energized. To overcome the high reluctance torque present at the detent zones upon energizing of the coils, small auxiliary coils are provided adjacent the high reluctance regions of the gap to give the rotor a high immediate starting torque to escape the detent zones and rapidly achieve steady-state angular velocity.

REFERENCES:
patent: 2677090 (1954-04-01), Fleming-Williams et al.
patent: 2761082 (1956-08-01), Chang
patent: 3264538 (1966-08-01), Brailsford
patent: 3806744 (1974-04-01), Abraham et al.
patent: 3873897 (1970-03-01), Muller
patent: 4286184 (1981-08-01), Kogler et al.
patent: 4303843 (1981-12-01), Arnoux et al.

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