Electric rotating machine

Details Electric rotating machine Electric rotating machine

1981-03-06

1983-09-13

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 41, 310156, 310163, H02K 3700

Patent

active

044044844

ABSTRACT:
A self-starting unidirectional rotating machine, suitable for use as a stepping motor, has a permanent magnet rotor and a pair of finger-like pole pieces extending axially alongside the rotor. These pole pieces are disposed asymmetrically so that, for example, the center of one pole piece is substantially diametrically aligned with an edge of the other pole piece. Bias magnets create a bias flux flowing through the pole pieces. A helical coil, when energized, provides a main rotor flux opposite to the bias flux and sufficient to overcome it. Upon energization, the rotor turns 180 electrical degrees in a preferred direction from a quiescent position to a second position. Then, upon deenergization, the rotor turns 180 electrical degrees from its second position to its quiescent position.

REFERENCES:
patent: 3370189 (1964-09-01), Haydon
patent: 3495107 (1969-04-01), Haydon
patent: 3857053 (1974-12-01), Yatsushiro
patent: 3999090 (1976-12-01), Sinnott
patent: 4004168 (1977-01-01), Haydon
patent: 4021689 (1977-05-01), Baltrush
patent: 4061936 (1977-12-01), Woolley

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