Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-12-09
1999-12-07
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
384100, 384114, 384123, H02K 516, F16C 3206
Patent
active
059988983
ABSTRACT:
Herringbone grooves are formed on an inner wall of a sleeve through which a motor shaft is inserted. Lubricating fluid is provided between a space between the shaft and the sleeve so as to form a relatively rotatable radial dynamic pressure bearing. A surface layer and the herringbone grooves on an inner wall of the sleeve, which are sliding regions with the motor shaft, have a different hardness from that of a base material of the sleeve. The hardness ratio of these two elements is set so that the shaft spins without wearing itself out as well as the sleeve surface layer. As a result, a highly reliable motor is achieved because the structure can maintain accurate whirling and suppress seizure due to abrasion powder between the shaft and the sleeve.
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Fukutani Hideshi
Wakitani Akihiko
Matsushita Electric - Industrial Co., Ltd.
Mullins Burton
Ramirez Nestor
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