Permanent magnet type electric motor

Details Permanent magnet type electric motor Permanent magnet type electric motor

1987-03-31

1988-02-23

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 2112

Patent

active

047272732

ABSTRACT:
A permanent magnet type electric motor including a cylindrical yoke, a plurality of magnetic poles arranged peripherally on an inner surface of the yoke and an armature arranged rotatably in a region surrounded by the magnetic poles is featured by the magnetic poles each composed of a rare earth metal containing magnet, a ferrite magnet and an auxiliary magnetic pole of a high permeability material all of which are juxtaposed in the order and satisfy axial length relations of (ferrite magnet)>(auxiliary pole).gtoreq.(rare earth metal containing magnet) and (ferrite magnet)>(armature core).

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