| 摘要 |
PROBLEM TO BE SOLVED: To prevent demagnetization of a magnet at a rotor magnetic pole end part without deteriorating motor performance, and to improve a demagnetization resistance of an inner magnet 9 to an outer magnet 10.SOLUTION: Counter-stator side surfaces of an inner magnet 9 and an outer magnet 10 are inclined so that magnet thicknesses P2 and P4 of respective magnetic pole end parts are gradually reduced from the center side in a circumferential direction toward a circumferential direction end. That is, a radial direction width of a rotor yoke 4d becomes larger (wider) gradually as it goes toward the circumferential direction end of an inner rotor magnetic pole and an outer rotor magnetic pole. Thereby, in the vicinity of the magnetic pole end part where a q-axis magnetic flux generating a reluctance torque and a d-axis magnetic flux generating a magnet torque are the most concentrated, magnetic saturation at the rotor yoke 4d can be suppressed. As a result, because magnetic leakage to the inner magnet 9 and the outer magnet 10 can be prevented, local demagnetization of the inner magnet 9 and the outer magnet 10 at the magnetic pole end part can be prevented. |
