| 摘要 |
PROBLEM TO BE SOLVED: To provide a permanent magnet field system-type rotor the work of which is easy, in which stress is hard to concentrate, and which eliminates drawbacks in terms of strength. SOLUTION: A laminated core 30, in which a ring-shaped connection part 32 surrounding a shaft and fan-shaped magnetic pole parts 31 whose number corresponds to the number of magnetic poles are integrally formed, is provided. In addition, square shape permanent magnets 3 which are arranged between the magnetic pole parts are provided. Then, hollow parts 34, whose corners are rounded and which are nearly rectangular, are formed in parts at the inside of the permanent magnets, which are magnetized circumferentially in alternate directions in the connection part. Central parts of the permanent magnets are exposed in the hollow parts. Inside flanges 37 are formed at the laminated core on both sides between the permanent magnets and the hollow parts, so as to come into contact with corners at the inside of the permanent magnets. Joining parts 35 between the adjacent hollow parts are extended radially, so as to connect the fan-shaped magnetic pole parts 31 to the connecting parts 32.
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