| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotor of a permanent magnet synchronous motor of, capable of relaxing stress concentration caused by the centrifugal force at the corner of a rotor slot but capable of maintaining the strength of a rotor core even if the rotor rotates at a high-speed. SOLUTION: In the rotor for a permanent magnet synchronous motor, of which the rotor core 51 made of a laminated electrical steel sheet disposed inside an armature 1, comprising through holes 58, 59 at its two wings, rectangular rotor slots 52, 53 formed by dividing the center part of the rotor core 51 between the through holes 58, 59, field permanent magnets 6A, 6B fixed into the rotor slots 52, 53, a salient pole 54 formed at the upper face of the field permanent magnets 6A, 6B, and a bridge 55 for connecting the salient pole 54 and the rotor core 51 between the rotor slots 52, 53, the rotor slots 52, 53 are equipped with steps 52E, 53E that are salient towards the bridge 55 between the neighborhood of the center of the edge of the bridge 55 and corners 52B, 53B that are positioned at bottoms of the slots, respectively.
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