Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-05-11
1992-04-28
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 310154, 310156, 310180, 310181, 310254, 310268, H02K 524
Patent
active
051091712
ABSTRACT:
A low noise brushless dc motor has a rotor with a permanent magnet and a stator with a bearing system mounting a shaft for rotating the rotor. The bearing system includes at least one axially extending bearing surface that terminates in axially spaced apart ends defining the outer axial limits of the bearing surface. Magnetic components of the rotor and the stator define a magnetic circuit. the magnetic components have an eccentricity creating an asymmetry in the magnetic circuit that causes a resultant lateral magnetic force to be applied on the shaft at a point axially inside the outer axial limits of the bearing surface, whereby the shaft exerts a pressure along the bearing surface between both ends of the bearing surface in a direction perpendicular to the rotor axis.
REFERENCES:
patent: 3500092 (1970-03-01), Heilmann et al.
patent: 4185214 (1980-01-01), Gerber et al.
patent: 4575652 (1986-03-01), Gogue
patent: 4647803 (1987-03-01), von der Heide
patent: 4730136 (1988-03-01), Muller
patent: 4851731 (1989-07-01), Saotome
patent: 4866317 (1989-09-01), Katayama
patent: 4891537 (1990-01-01), Shiraki
Papst-Motoren GmbH & Co. KG
Skudy R.
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