Hybrid Cooling system of an IPMSM for Electric Vehicle Traction applications

Document Type : Original Article

Authors

1 Electrical Engineering Dept., Faculty of Engineering, Minia University, Minia, Egypt

2 Dept. of Mechanical Power and Energy Engineering, Faculty of Engineering, Minia University, Minia, Egypt

Abstract

In this paper, an improved hybrid ventilation method of interior permanent magnet synchronous motor (IPMSM) is proposed to improve its thermal and electrical characteristics. Increasing motor temperature affects the stator winding and the permanent magnet (PM) inserted in the rotor. The water jacket method was proposed in different traction systems; however, the total weight and cost were increased. To increase the effectiveness of the cooling system, stator and rotor ducts are inserted to increase heat exchange between inner parts and external cooling water. One-layer ducts are inserted into the stator, and two-layer ducts are inserted into the rotor. However, the ducts may affect the flux density in the rotor and stator, which increases saturation level and degrades the electromagnetic performance. Optimum design is performed to determine the size of the stator and the rotor ducts. The effect of the designed ducts on electromagnetic and thermal performance is analyzed using the two-dimensional finite element method. The performance of the proposed method is evaluated under short transient and standard duty cycle operation. The numerical results show an effective reduction in stator winding and PM temperature. Under short peak power transient, the maximum temperature of the PM decreases from 78 to 60 oC and the maximum temperature of the stator winding is decreased from 177 to 167.9 oC. During long transient, the temperature of the PM and stator winding are 85 C and 101 oC, respectively.

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