Stepping motor

Details Stepping motor Stepping motor

1984-07-17

1985-12-17

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 90, 310259, 308DIG5, H02K 3700

Patent

active

045594619

ABSTRACT:
A stepping motor includes a rotary shaft, a rotor magnetized in an axial direction thereof and having a plurality of magnetic poles arranged in a circumferential direction thereof with different poles in alternation, inner yokes each having a plurality of projections and depressions, outer yokes each having a plurality of projections and depressions which are separated from and oppose the depressions and projections of the corresponding inner yoke in a plane perpendicular to the axial direction, coils for magnetizing the inner and outer yokes to assume mutually different magnetic poles, and oil impregnated bearings made from a ferromagnetic material. The bearings each unitarily comprise a bearing part for supporting the rotary shaft, and a core part having an outer side thereof surrounded by one of the coils.

REFERENCES:
patent: 2669491 (1954-02-01), Haller
patent: 2814746 (1957-11-01), Boerdijk
patent: 3109684 (1963-11-01), Tupper
patent: 3219862 (1965-11-01), Kieffert
patent: 3671841 (1972-06-01), Hoffmann
patent: 3803430 (1974-04-01), da Costa
patent: 4207483 (1980-06-01), Baer
patent: 4371220 (1983-02-01), Bruchner

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