Permanent magnet excited electric motor

Details Permanent magnet excited electric motor Permanent magnet excited electric motor

1988-10-05

1991-09-10

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310154, 310254, H02K 122

Patent

active

050476823

ABSTRACT:
A permanent magnet excited electric motor is provided with a low circumferential hump-like protrusion on the face of each electromagnetic pole to partially decrease the air gap between the stator and rotor and act as a so-called magnetic cam to exert a force on the rotor to smooth an otherwise uneven parasitic slot torque that occurs between the interaction of slot openings of the electromagnetic poles and the gaps between the permanent magnet poles.

REFERENCES:
patent: 2575153 (1951-11-01), Wightman
patent: 3081412 (1963-03-01), Granier
patent: 3353046 (1967-11-01), Papst
patent: 4341969 (1982-07-01), Sievert
patent: 4471252 (1984-09-01), West
patent: 4516048 (1985-05-01), Brigham
patent: 4554474 (1985-11-01), Morishita et al.

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