Self-starting synchronous and stepping motor having a permanent

Details Self-starting synchronous and stepping motor having a permanent Self-starting synchronous and stepping motor having a permanent

1975-07-28

1977-06-21

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310186, H02K 3700

Patent

active

040314197

ABSTRACT:
A self-starting synchronous or stepping motor has at least two phases, a permanent magnet rotor and a stator including individually excited and inwardly facing main stator poles. The stator poles and rotor poles have a predetermined spacing of .tau.p. The stator poles are combined in groups of alternate polarity. The groups are displaced by a predetermined angle. At least one windingless auxiliary stator pole of approximately one-half of the width of the main stator pole is provided per group in addition to the main stator poles. The total number of stator poles is at least equal to the number of rotor poles. Additional auxiliary poles may be either half-pole widths or pointed shape. Embodiments of two-phase and three-phase synchronous motors are disclosed.

REFERENCES:
patent: 3636557 (1972-01-01), Watkins
patent: 3866104 (1975-02-01), Heine
patent: 3875437 (1975-04-01), Hara et al.

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