| 摘要 |
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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