Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-03-28
1998-03-03
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 310 67R, 360 9908, 384100, H02K 516, H02K 5167, H02K 5173
Patent
active
057239274
ABSTRACT:
A dynamic pressure bearing spindle motor includes a housing; a sleeve fixed to the housing and having a projecting lip; a rotor hub rotatable with respect to the housing and having a stopper which is engageable with the projecting lip; a shaft fixed to the rotor hub and rotatably inserted into the sleeve; a thrust plate attached to the sleeve so as to be opposed to an end face of the shaft; and lubricating oil provided between the thrust plate and the end face of the shaft to form a thrust bearing and also provided between the shaft and the sleeve to form a radial dynamic pressure bearing. The stopper is put into engagement with the projecting lip of the rotor hub when the rotor hub moves in a thrust direction, thereby preventing the rotor hub from coming off from the sleeve, and wherein dimensions of the motor satisfy the expression a<2d<b where an outer diameter of the sleeve excluding the projection lip is a, an outer diameter of the projecting lip is b, and a radius of curvature of an inner periphery of the stopper is d.
REFERENCES:
patent: 5112141 (1992-05-01), Asada et al.
patent: 5210665 (1993-05-01), Nishizawa
patent: 5559382 (1996-09-01), Oku et al.
patent: 5623382 (1997-04-01), Moritan et al.
Dougherty Thomas M.
Matsushita Electric - Industrial Co., Ltd.
Tamai Karl Imayoshi
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