Permanent magnet motor

Details Permanent magnet motor Permanent magnet motor

2005-05-20

2008-09-16

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S156380, C310S156460

Reexamination Certificate

active

07425785

ABSTRACT:
In a permanent magnet motor consisting of a rotor1, which is supported on a rotating shaft2and has twelve permanent magnets3arranged at fixed intervals in the circumferential direction in the peripheral edge portion thereof, and a stator4, which is disposed around the rotor1with a gap being provided with respect to the rotor1and has nine magnetic poles4a, each having a coil wound thereon, arranged at fixed intervals in the circumferential direction so as to face towards the outer peripheral surface of the rotor1,a value obtained by dividing the radius of the rotor1by the radius of curvature of a permanent magnet surface facing towards the stator is set at a value such as to decrease cogging torque.Thereby, there is provided a permanent magnet motor in which the radius of an arcuate shape which can minimize cogging torque is theoretically verified, by which the optimum radius can be determined limitedly for a permanent magnet motor consisting of a rotor having twelve permanent magnets and a stator having nine magnetic poles.

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