Analysis and Experimental Research on Electromagnetic Field Harmonic for High-speed Permanent Magnet Synchronous Motor

The high-speed permanent magnet synchronous motor supported by the air foil bearing for the air compressor was used to provide the high-pressure air and realized the high-efficiency chemical reaction in the hydrogen fuel cell vehicle. Theoretical analysis was applied to study the electromagnetic field harmonic between the armature and rotor. For the cylindrical permanent magnet, the expressions of the magnetic flux density and tooth harmonic were obtained. The radial and tangential components of the armature magnetic flux density generated by the three-phase winding were given by the analytic expression. The finite element simulation analysis was carried out and the results were obtained. The magnetization mode of the cylindrical permanent magnet could influence the harmonic. With an increase in the air gap width, the tooth harmonic decreased. The armature magnetic field harmonic of the single-layer, double-layer and circular winding were analyzed respectively. Based on the experiment system, the experiment data of the high-speed permanent magnet synchronous motor driven by 10 kW at the speed of 90000 rpm were obtained. It indicated that the operation was stably and the electromagnetic performances were consistent with the simulation results.