| 摘要 |
A rotor core is provided with a plurality of slits extending in the rotation shaft direction, independently of openings. The first slit is arranged at the center of the magnetic pole of the rotor core to be capable of absorbing stress acting on an inner circumferential surface of each opening in a direction normal to a main surface of a permanent magnet. The second slit is arranged between the magnetic poles of the rotor core to be capable of absorbing stress acting in parallel with the main surface of the permanent magnet. Thus, the rotor core is prevented from deforming in a radial outward direction. Further, by forming the first and second slits each in a form not interfering the magnetic path of the magnetic flux by the stator passing inside the rotor core, the motor performance is ensured.
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