1982-08-26
1984-04-17
Skudy, R.
Cutlery
308DIG1, 384113, 310 90, 350 65, F16C 3906
Patent
active
044430434
ABSTRACT:
In a motor unit, a motor shaft is supported by a pair of journal bearings of a herringbone dynamic pressure type. A polygonal mirror is fixed to one end of the motor shaft, and a magnetic thrust bearing is arranged at the other end so that the motor shaft is suspended thereby. The magnetic thrust bearing is formed of ring-shaped first and second permanent magnets. The first permanent magnets are coaxially fixed to the motor shaft and each have one pole on their outer surfaces. The second permanent magnets are fixed to a motor housing, and have their inner surfaces opposed to the outer surfaces of the first permanent magnets. The inner surface of each second permanent magnet has a pole different from that of its corresponding first permanent magnet. The first and second permanent magnets attract one another so that the motor shaft is suspended by attraction.
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Journal of J.S.M.E.; vol. 76; No. 650; 2/73 Kaneko et al.; Nippon Tel. & Tel. Publ. Corp.; Musashino Res. Ctr.
Skudy R.
Tokyo Shibaura Denki Kabushiki Kaisha
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