Permanent magnet type synchronous motor.

摘要

A rotor (101) of a permanent magnet type synchronous motor facing to a stator (106) having a number of slots (107), comprises a rotor core (103) fixed to a motor shaft (105) and an even-numbered permanent magnet provided on a circumferential direction of the rotor core. Projecting portions (103A) are formed in the shape of protruding a portion of the rotor core among 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 (2) for detecting the permanent magnet position of the rotor comprises detectors (30A, 30B, 30C) of the normal rotation and other detectors (30D, 30E, 30F) of the reverse rotation. These detectors are arranged having predetermined phase differences ( alpha , beta ) to a center line. A pattern generating circuit (18) is provided for switching the conducting position to the stator winding corresponding to the phase differences.