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A rotor of a permanent magnet type synchronous motor facing a stator having a number of slots comprises a rotor core fixed to a motor shaft and an even number of permanent magnets in a circumferential direction of the rotor core. Projecting portions are formed in the shape of a protruding portion of

A rotor of a permanent magnet type synchronous motor facing a stator having a number of slots comprises a rotor core fixed to a motor shaft and an even number of permanent magnets in a circumferential direction of the rotor core. Projecting portions are formed in the shape of a protruding portion of the rotor core over each permanent magnet. The width (A) of each projecting portion is different from the pitch (B) of the slots of the stator. A position detector for detecting the permanent magnet position of the rotor comprises detectors of the normal rotation and other detectors of the reverse rotation. These detectors are arranged having predetermined phase differences (ab

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A permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed substantially close to and in opposition to said stator so that said rotor can be rotated, said rotor comprising a rotor core mounted fixedly on a motor shaft, with an even number of pe

A permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed substantially close to and in opposition to said stator so that said rotor can be rotated, said rotor comprising a rotor core mounted fixedly on a motor shaft, with an even number of permanent magnets each having a single polarity in the circumferential direction and being provided on a circumferential portion of said rotor core, said rotor core including a plurality of projecting portions which are formed by projecting parts of an outer circumferential region of said rotor core and project between said permanent magnets, each boundary surface formed by respective ones of the projecting portions and the permanent magnets extending along a radius of said rotor, and the width (A) of each of said plurality of projecting portions being set different from the pitch of said slots in said stator.