Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1985-11-20
1988-03-29
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 62, 310 67R, 310 90, 310 91, 310156, 310180, 277 80, 277135, 384133, 384372, F16C 3906
Patent
active
047346060
ABSTRACT:
An electric motor including an integral ferrofluid bearing provides significant reduction in non-repeatable runout, stray flux, and audible noise over conventional motors using ball bearings. The motor includes a hub and a base, with the base attached to a tapered magnetically permeable shaft which defines an inner bearing race, and the hub attached to an internally tapered, magnetically permeable sleeve which defines an outer bearing race. Permanent magnets surround and are rotatable with the sleeve to provide mangetic fields which interact with the stator winding to cause rotation of the hub and sleeve. In addition, the permanent magnets form magnetic flux paths with the shaft and the sleeve to maintain ferrofluid lubricant between the inner and outer bearing races.
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