Rotor Intensity Analysis of High-speed Axial Flux PM Machine for Electric Traction

In comparison with the conventional radial flux (RF) machine, higher torque density and axial compactness are the main attraction for the application of axial flux (AF) machine in electric vehicle traction system. The motivation toward higher speed for traction motors comes from the aggressive cost target per unit for mass manufacturing and improving the power density performance. The axial topology creates mechanical challenges including expansion due to high speed, and axially thin builds that affect rotor dynamics. Based on the determined geometric dimensions of the electromagnetic components, a reliable mechanical construction of dual-rotor is developed for AFPM motor in this paper. Finally, the prototype is successfully manufactured and measured, which verifies that the proposed rotor construction is reliable.