Synchronous motor having magnetic poles of permanent magnet and

Details Synchronous motor having magnetic poles of permanent magnet and Synchronous motor having magnetic poles of permanent magnet and

1995-03-24

1997-05-20

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 2112

Patent

active

056315120

ABSTRACT:
Hard magnetic poles made of a permanent magnet and soft magnetic poles are alternately disposed on the periphery of a cylindrical rotor of a permanent magnet type synchronous motor. The arcuate length of the hard magnetic poles is equal to that of the intervals between the hard magnetic poles, thereby enabling an increase in the ratio of reluctance torque. Therefore, the number of permanent magnets used can be reduced, making production economical, and a back electromotive force can also be lowered. Further, one magnetic pole consists of six slots, and the arcuate length of hard and soft magnetic poles corresponds to a 3-slot pitch, thereby enabling a reduction in cogging torque.

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