PERMANENT MAGNET SYNCHRONOUS MOTOR

PROBLEM TO BE SOLVED: To provide a permanent magnet synchronous motor capable of making an induced voltage waveform similar to a sinewave, minimizing the amplitude of cogging torque and a required skew angle, and minimizing the influence of unbalanced attraction force even if the capacity thereof becomes large. SOLUTION: This permanent magnet synchronous motor 6 in a three-phase P-pole N-coil structure is composed of a stator 4 which is constituted by winding N pieces of concentrated-wound armature coils 41 for forming a rotating field around a surface of the inner periphery of a stator core 42, and a rotor 5 provided with a magnetic clearance from the stator 4 and provided with a permanent magnet 51 having P poles of which the polarity is alternately different around a surface of a rotor core 52. The relation of the number of the coils N is made N=3×(2×n+1), and the number of poles is made P=N±1 (n: natural number). When magnetomotive force vector which is developed by the armature coil 41 at the time of energization is represented by an electric angle of 0-360 deg., the armature coil 41 is disposed so that the magnetomotive force vector of the respective phases may concentrate in a zone of 120 deg., respectively.