| 摘要 |
A rotor for a synchronous motor capable of increasing output torque and reducing inductance. An outer periphery of each pole of the rotor in cross section perpendicular to an axis of the rotor is defined on the basis of a curve of a hyperbolic function (10). Since an outer periphery of one pole of the rotor at a central apex portion (a) is substantially identical with that of a conventional rotor defined by a circular arc (11), the output torque of the synchronous motor using this rotor is not decreased. At side portions (b) adjacent to the central apex portion (a), the outer periphery of the rotor pole is positioned inwardly, i.e. closer to the axis (0) of the rotor than the outer periphery defined by the circular arc (11), so that a gap between the outer periphery of the rotor pole and an inner periphery of a stator is made greater at the side portions (b) to reduce the inductance of the synchronous motor. <IMAGE> |
