Synchronous motor

Details Synchronous motor Synchronous motor

1974-03-05

1976-07-06

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 43, 310162, 264323, 260 4217, 428323, H02K 2114

Patent

active

039683907

ABSTRACT:
A synchronous motor is provided with a rotor including magnetic poles composed of a permanent magnet fixed around a rotor shaft, a stator facing the outer periphery of the rotor with an air gap formed therebetween, and a guard ring made of a non-magnetic material of low resistivity and fitly disposed around the outer periphery of the permanent magnet to restrain the surface loss caused by the magnetic flux linking with the guard ring, thereby preventing the reduction of the efficiency of the synchronous motor.

REFERENCES:
patent: 3163788 (1964-12-01), Powers
patent: 3471725 (1969-10-01), Moret et al.
patent: 3642976 (1972-02-01), Buckley et al.
patent: 3720575 (1973-03-01), Cowlard et al.

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