Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1999-03-25
2000-03-07
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
384115, 384121, H02K 700, F16C 1700, F16C 3300
Patent
active
060344547
ABSTRACT:
A motor having a shaft body, a generally disk-like thrust plate extending outwardly in a radial direction from an outer periphery surface of the shaft body, a cylindrical sleeve structure which forms a fine clearance between itself on one hand and the shaft body and the thrust plate on the other, with an amount of lubricant fluid maintained in at least a part of the fine clearance. The motor further includes a hydrodynamic bearing apparatus capable of holding the shaft body and the sleeve structure so as to effect a relative rotation between the shaft body and the sleeve structure, any one of the shaft body and the sleeve structure being secured on a rotor equipped with a rotor magnet, the other one of the shaft body and the sleeve structure being adapted to act as a stationary member cooperative with a stator, a radial bearing section capable of holding the lubricant fluid between the shaft body and an internal vertical surface of the sleeve structure, a thrust bearing section capable of holding the lubricant fluid between one side of the thrust plate and an internal horizontal surface of the sleeve structure, and a thrust gas-interposing section communicated to the outside atmosphere formed on the other side of the thrust plate. The rotor is under an action of a magnetic bias in a manner such that the one side of the thrust plate is urged in an axial direction of the sleeve structure.
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Dougherty Thomas M.
Mullins Burton S.
Nidec Corporation
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