Winding grooves are formed in a
stator iron core in the circumferential direction, the winding grooves comprise outer-layer
stator grooves on the yoke portion side and inner-layer
stator grooves on the side close to a
permanent magnet rotor,
harmonic windings are embedded in the outer-layer stator grooves, and the
harmonic windings are double-layer short-
pitch windings; a fundamental wave winding is embedded in the inner-layer stator slot, and the fundamental wave winding is a centralized winding; a plurality of modulation teeth are arranged in the stator iron core along the circumferential direction in a non-
equidistant manner; the number pf of pole pairs of the fundamental wave winding is consistent with the number pf of pole pairs of the
permanent magnet rotor, the number ph of pole pairs of the
harmonic wave winding is different from the number pf of pole pairs of the fundamental wave winding, and the number Ns of poles of the modulation teeth meets the condition that Ns = pf + ph, Ns = (1 + 2n) ph or Ns = (1 + 3n) ph. The technical defects that a traditional
permanent magnet motor cannot utilize harmonic
waves and a conventional
magnetic gear effect
permanent magnet motor cannot efficiently utilize harmonic
waves and fundamental
waves to do work can be overcome, the
torque density of the motor is greatly improved while the
power factor is not degraded, and the complexity, the
system cost and the additional loss of a
magnetic field modulation structure are reduced.