Permanent magnet synchronous motor

Details Permanent magnet synchronous motor Permanent magnet synchronous motor

2007-06-19

2007-06-19

Tamai, Karl (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S254100, C310S156280, C310S179000, C310S162000

Reexamination Certificate

active

11132386

ABSTRACT:
The present invention provides a permanent-magnet-synchronous-motor having a stator with concentrated windings with the following structure so that permanent magnet (6) is hard to subjected to demagnetization magnetic field: 0.3 Lg<La≦2.0 Lg, where La is a clearance between teeth of stator (1), and Lg is an air-gap between stator (1) and rotor (2). Outer walls of both ends of the permanent magnet (6) disposed within rotor (2) in a rim direction may be tapered toward inside from a rotor rim in a radial direction and to form a recessed section on the outer walls of the magnets. As a result, withstanding force against demagnetization is expected to increase.

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Zhu Z Q et al: “Influence of design parameters on cogging torque in permanent magnet machines” May 18, 1997, Electric Machines and Drives Conference Record, 1997. IEEE International Milwaukee, WI, USA May 18-21, 1997, New York, NY, USA, IEEE, US, pp. MA1-31, XP010231718.

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