Abstract: When the inherent tooth harmonic magnetic field is utilized to achieve the adjustment of the air gap magnet field for the permanent magnet machine, it needs to correctly handle the relationship between utilization of tooth harmonic magnetic field and armature winding voltage waveform distortion. The principle of the rotor tooth harmonic winding currents and the characteristics of the tooth harmonic electromotive force（EMF） were analyzed qualitatively based on the permeability analysis method. The method of the forward-series tooth harmonic windings in the adjacent magnetic pole can solve the magnetic coupling problem between the armature windings and the tooth harmonic windings, thus eliminate the tooth harmonic EMF of the armature windings. Calculations and experiments were performed for one hybrid excitation permanent magnet synchronous generator utilizing tooth harmonic for excitation, and the comparison of calculated and experimental results verify the correctness of the theoretical analysis.