Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-08-01
1993-06-15
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 51, 310 67R, 310114, 310177, H02K 2112
Patent
active
052202275
ABSTRACT:
A rotor magnet of the type including a plurality of circumferentially arranged magnets of alternately opposite polarities, wherein each of the magnets has a magnetizing pattern such that the magnetic force is minimum at predetermined portions near opposite ends of the magnet and gradually increases from the predetermined portions toward the center of the magnet and also from the predetermined portions toward the opposite ends of the magnet. With this magnetizing pattern, the rotor magnet has a substantially sinusoidal waveform-like magnetic flux density distribution pattern when the motor is rotating. As a consequence, the magnetic polarity changes smoothly and the motor can, therefore, operate at a low operation noise.
REFERENCES:
patent: 3873897 (1975-03-01), Muller
patent: 4030005 (1977-06-01), Doemen
patent: 4097754 (1978-06-01), Farr
patent: 4371817 (1983-02-01), Muller
patent: 4417186 (1983-11-01), Hirose
patent: 4574211 (1986-03-01), Muller
patent: 4717850 (1988-01-01), Muller
patent: 4730136 (1988-03-01), Muller
patent: 4998032 (1991-09-01), Burgbacher
JP 61-177 148 A Patent Abstracts of Japan, Sec. E. vol. 10, Oct. 24, 1986, Nr. 386 (E-467).
Skudy R.
Zexel Corporation
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