Stepping motor

Details Stepping motor Stepping motor

1977-09-02

1980-11-18

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 45, 310 68R, 310156, 310258, 318696, H02K 3700

Patent

active

042348080

ABSTRACT:
A stepping motor of the homopolar design with a step angle of 3.6.degree. and having a generally cubic form is disclosed. The motor includes a generally square, single-section laminated stator which has only four stator poles extending radially inwardly from the middle regions of the straight sides, and a concentric rotor secured to a shaft journaled in a pair of bearing bells fixed to the stator at the opposite faces thereof and having the same generally square configuration. The rotor includes a disc-shaped permanent magnet of high remanent energy density (B.times.H).sub.max .gtoreq.10.times.10.sup.6 GOe, and a pair of annular steel rotor elements provided at the working air gap with identical numbers Z.sub.r of rotor teeth of pitch .tau..sub.r =360.degree./Z.sub.r. Each stator pole is provided at the working air gap with four or five stator pole teeth of pitch .tau..sub.s =360.degree./Z.sub.s, where Z.sub.s is the theoretically maximum available number of stator pole teeth and must be evenly divisible by 4, and Z.sub.s =Z.sub.r -1.+-.k where k is an even integer and 0.ltoreq.k.ltoreq.6. A special twin-section insulation member adapted to be axially fitted into the stator from the opposite faces thereof and designed to permit simultaneous machine winding of the field windings onto the respective stator poles is also disclosed. This abstract is not to be taken either as a complete exposition or as a limitation of the present invention, however, the full nature and extent of the invention being discernible only by reference to and from the entire disclosure.

REFERENCES:
patent: 2982872 (1961-05-01), Fredrickson
patent: 2999176 (1961-09-01), Lindstrom
patent: 3117268 (1964-01-01), Madsen
patent: 3506859 (1970-04-01), Snowdon
patent: 3621312 (1971-11-01), Palermo
patent: 3777196 (1973-12-01), Field
patent: 3862492 (1975-01-01), Crabb
patent: 3956678 (1976-05-01), Byrne
patent: 4048530 (1977-09-01), Kaufman
IBM Tech. Discl. Bulletin; Davies & Desautels; Wound Rotor Incremental Motor; vol. 12, No. 12.

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