| 摘要 |
PROBLEM TO BE SOLVED: To provide an IPM (internal permanent magnet) motor wherein large torque can be generated when requested and induced voltage can be reduced when a rotor is rotated at high speed by external force. SOLUTION: The IPM motor includes a rotor 11 and a stator 12 opposed to the rotor 11. The rotor 11 includes a rotor core 17 and field magnets 13. One pole of each field magnet 13 is constructed of multiple permanent magnets 19, 20. The rotor core 17 includes: a rotor core body 17b; an outer portion 17a positioned outside the permanent magnets 19, 20; and bridge portions 17c that run between the permanent magnets 19, 20 and join the outer portion 17a with the rotor core body 17b. The width of each bridge portion 17c in the direction of the circumference of the rotor 11 is more than 0.05 times the sum of the widths of the permanent magnets 19, 20 in the above circumferential direction. COPYRIGHT: (C)2007,JPO&INPIT
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