| 摘要 |
PROBLEM TO BE SOLVED: To drastically improve the cooling performance of a rotor by arranging a reinforcing member while dividing it into at least two portions in the direction of the rotary shaft of the rotor. SOLUTION: Cylindrical permanent magnets 3a-3f are arranged in the direction of the shaft of a rotor at the outer-periphery part of a solid shaft 2 made of steel of a magnetic material. Then, cylindrical reinforcing members 4a and 4b made of carbon fiber reinforced resin (CFRP) are arranged at the outer- periphery part of the permanent magnets 3a-3f. Also, an annular member 6 made of a nonmagnetic metal material is fitted between the permanent magnets 3a and 3d. Further, annular members 5a and 5b made of a nonmagnetic material for preventing the leakage of magnetic flux and for protecting the end face of the permanent magnets 3a-3f are fitted to both the ends in the direction of the shaft of the rotor of the permanent magnet 3 and the reinforcing members 4a and 4b. In this manner, the part of the rotor 1 that is not covered with CFRP is divided into two portions and a metal annular member 6 is installed at the center, thus allowing heat generation inside the rotor to effectively escape to the outside.
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