| 摘要 |
PCT No. PCT/SE85/00327 Sec. 371 Date Apr. 11, 1986 Sec. 102(e) Date Apr. 11, 1986 PCT Filed Sep. 2, 1985 PCT Pub. No. WO86/01652 PCT Pub. Date Mar. 13, 1986.A synchronous servomotor has a slotted stator core (7) with windings placed in the slots (8) thereof, and a rotor core (5) having magnetic poles formed by permanent magnets (6) attached to the core (5). For the purpose of reducing the reluctance torque, at least certain poles are displaced from the positions which correspond to fully uniform distribution of the poles around the rotor core through a displacement angle which corresponds to a fraction of the slot pitch in the stator core. Mutually, different poles are advantageously displaced from the positions corresponding to fully uniform pole distribution through mutually different angles, although in a manner such that the magnetic forces acting on the rotor core balance one another. The permanent magnets (6) attached to the rotor core ad forming the magnetic poles are suitably of substantially uniform thickness and of arcuate configuration havng a curvature of radius which is smaller than the radial distance of the permanent magnets from the rotary axis of the rotor core.
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