Single phase stepper motor

Details Single phase stepper motor Single phase stepper motor

1977-04-22

1979-02-06

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 58 23D, H02K 3700

Patent

active

041386175

ABSTRACT:
A single phase stepper motor is formed of a rotor having a shaft carrying a driving pinion and a permanent magnet and a stator having a body of diamagnetic or paramagnetic material, a field winding producing an excitation field transverse to the axis of the rotor shaft and a pair of diametrically opposed auxiliary poles spaced from the excitation field. The permanent magnet is constructed of a lanthanide ferromagnetic alloy, such as a lanthanide cobalt alloy and preferably a samarium cobalt alloy; and the permanent magnet has a moment of inertia substantially the same as or less than the moment of inertia of the combination of the rotor shaft and the driving pinion. The stator body has a plurality of pairs of holes therein for supporting a U-shaped, rod-like member having ends forming the auxiliary poles in a plurality of positions to permit adjustment of the direction of rotation and torque of the rotor.

REFERENCES:
patent: 2265781 (1941-12-01), Schweitzer, Jr.
patent: 3652884 (1972-03-01), Vuffray
patent: 3803433 (1974-04-01), Ingenito
patent: 3943698 (1976-03-01), Ono

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