Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-09-14
1994-02-01
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310218, 310257, H02K 3700
Patent
active
052834875
ABSTRACT:
A stator yoke is configured for engaging with similarly configured stator yokes of a stepping motor. The stator yoke comprises a cylindrical ring made of a magnetic material and has a first annular edge and a second annular edge. A plurality of tooth poles are integrally formed with the cylindrical ring and are disposed in spaced-apart relation along the first annular edge. The plurality of tooth poles are engageable with a plurality of tooth poles of a similarly configured stator yoke of the stepping motor. The stator yoke has a plurality of locating protrusions integrally formed with the cylindrical ring and disposed in spaced-apart relation along the second annular edge. The plurality of spaced-apart locating protrusions are engageable with locating protrusions of a similarly configured stator yoke of the stepping motor or with a support plate of the stepping motor. The locating protrusions accurately ensure the relative angular position of tooth poles between adjacent phases of the stepping motor. A stepping motor includes an outer stator comprised of the above described stator yokes. A pair of interior stator yokes engage with each other through their respective locating protrusions, and each of a pair of exterior stator yokes engage with a corresponding one of the pair of interior stator yokes through their respective tooth poles.
REFERENCES:
patent: 4274026 (1981-06-01), Haydon
patent: 4381465 (1983-04-01), Renkl
patent: 4942325 (1990-07-01), Fukaya
patent: 4972109 (1990-11-01), Kakizaki
patent: 4985669 (1991-01-01), Smith
patent: 5132603 (1992-07-01), Yoshimoto
patent: 5177384 (1993-01-01), Furuki
Okada Koji
Oki Shigeru
Adams Bruce L.
Seiko Instruments Inc.
Skudy R.
Wilks Van C.
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