Design and Research of Axial Flux Permanent Magnet Motor for Electric Vehicle

Electric drive system improves the operation performance of electric vehicles, but brings high technical requirements of the motor. This paper proposes an axial flux permanent magnet near-wheel motor with double stator and single rotor structure for electric vehicle. Focusing on the purpose of reducing the THD of back electromotive force, reducing torque pulsation and rotor eddy current loss, the stator slot type, pole-slot combination, skewed permanent magnet and segments of permanent magnet are analyzed. In order to realize high overload capacity, the spiral channel heat dissipation design is presented. In addition, the weight reduction design is carried out on the front and rear end cover, shell and rotating shaft of the motor. Meanwhile the strength analysis and modal analysis are finished by FEA tools. Finally, a prototype of the axial magnetic flux permanent magnet motor was produced, and an experimental platform was built to test the efficiency characteristics, magnetic field weakening properties and temperature rise of the near-wheel motor. The experimental results verify the rationality of the design scheme.