Stator Cooling Channel Impact on Electromagnetic and Thermal Performance of Wound Field Synchronous Motor for EV Application

This paper investigates the design of stator cooling channels to efficiently take away the heat in the wound field synchronous motor (WFSM) for EV application. The influence of the stator cooling channel on the electromagnetic and thermal performance is compared and analyzed in this paper, including the electromagnetic torque, losses, and temperature rise considering the constraints of the fluid pressure drop. To improve the computational efficiency, the 2-D electromagnetic finite-element method and thermal circuit method are employed for the WFSM. The optimal selection of stator cooling channels is obtained after the sensitivity and correlation analysis by considering an 800 Nm, 3700 rpm WFSM for a heavy-duty vehicle.