| 摘要 |
It is an object to obtain a highly efficient synchronous induction motor by letting the magnetic flux hardly pass in the direction of a q axis without interrupting a magnetic path in the direction of a d axis and by increasing a salient pole difference. A slit next to a shaft 5 is extended towards the shaft along a circumference of the shaft 5 to form an extended part of slit 8 a. In addition, a gas vent hole 7 is formed as a slender opening stretched in the direction of d axis, and a slit is projected along the circumference of the gas vent hole 7. Further, the gas vent hole 7 is formed as a slender opening stretched in the direction which is displaced by a predetermined angle from the d axis. Yet further, a rotor iron core 1 is formed by a plurality of rotor iron core portions in the laminating direction, and the rotor iron core portions have different shapes of slits, respectively.
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