Electromagnetic-Thermal Coupling Optimization of Concentrated Winding PM Motor with Auxiliary Teeth for Electric Vehicle

Abstract

This paper aims to provide a simple design for a better contact between the heat source and cooling equipment. The auxiliary teeth are introduced for a better heat dissipation. Although the auxiliary teeth provide an extra heat path, the electromagnetic performance will be jeopardized in terms of lower output torque and higher loss. In this paper, the width of the auxiliary teeth is expanded and the same width of the stator teeth is reduced to ensure that the slot full rate remains unchanged. The comprehensive influence of this structural change on the electromagnetic and thermal performance of the motor is studied. Furthermore, three representative cases are selected for detailed comparison. Finally, the law of auxiliary teeth on electromagnetic performance and motor temperature rise is given. The predicted results reveal that the proposed method provides a new solution for the thermal design of concentrated winding permanent magnet motor.