Analysis of Heat Transfer and Cooling Structure of Dual-waterway Parallel Axial Flux Permanent Magnet Synchronous Motor for Electric Vehicles

As to dual-stator single-rotor axial flux permanent magnet synchronous motor (AFPMSM) for electric vehicle driving, in order to further improve the power density of the motor and reduce the temperature of the permanent magnets (PMs) which are difficult to dissipate heat, the spiral waterway parallel axial Z secondary waterway (SWPAZSW) and the spiral waterway parallel radial Z secondary waterway (SWPRZSW) are proposed in this paper. By using the finite volume method, the loss of the motor considering actual inverter power supply is introduced into temperature field for calculation. Then, the cooling structure effects of spiral waterway and two waterways mentioned above are analyzed on flow velocity, pressure and temperature. And the influence on the temperature of entire motor is analyzed. Finally, the accuracy of simulation is verified by manufacturing the prototype and conducting temperature rise experiment.