| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotor with high torque. SOLUTION: The rotor 1 is constituted of a Halbach arrangement composed of four kinds of gradient directional magnets 4 to 7 and two kinds of circumferential magnets 8, 9 that are circumferentially magnetized. The circumferential width of each of the gradient directional magnets 4 to 7 is set to be a half of the circumferential width of each of the circumferential magnet 8, 9. When the radial width of each of the gradient directional magnets 4 to 7 and each of the circumferential magnets 8, 9 is t, the magnetization direction in each of the gradient directional magnets 4 to 7 is set so that a gradient angleθwith respect to the radial direction satisfies a relation ofθ≤11.5×ln(t)+1. The gradient angleθis also set so as to satisfy a relation ofθ=ä11.5×ln(t)-9}±2. COPYRIGHT: (C)2007,JPO&INPIT
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