Lumped-parameter thermal network model and experimental research of interior pmsm for electric vehicle

Abstract

A 25kW interior permanent magnet synchronous machine (IPMSM) applied to the electric vehicle is introduced in the paper. A lumped-parameter thermal network model is presented for IPMSM temperature rise calculation. Furthermore, a 3D liquid-solid coupling model considering the assembly clearance is compared with the 2D lumped-parameter thermal network model. Finally, a dynamometer platform for temperature rise measurement is established to verify the above-mentioned methods, which obtains the measured efficiency map at rated load case and overload case. At the same time, the measured no-load back electromotive Force (EMF), load line input voltage and load current are gathered. Thermocouple PTC100 is used to measure the temperature of the stator winding and iron core, and the FLUKE infrared thermal imager is applied to measure the surface temperature of PMSM and controller. Testing result shows that the lumped-parameter thermal network have a high accuracy to predict each part temperature. Index Terms-Interior permanent magnet synchronous machine, lumped-parameter thermal network, liquid-solid coupling, thermal resistance, thermal conductance.