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JEET, Vol. 13, No. 6, November 2018 
LumpedParameter Thermal Analysis and Experimental Validation of Interior IPMSM for Electric Vehicle
Qixu Chen 
Area 
B  Electric Machinery and Power Electronics 
Abstract 
A 50kW4000rpm interior permanent magnet synchronous machine (IPMSM) applied to
the highperformance electric vehicle (EV) is introduced in this paper. The main work of this paper is
that a 2D Ttype lumpedparameter thermal network (LPTN) model is presented for IPMSM
temperature rise calculation. Thermal conductance matrix equation is generated based on calculated
thermal resistance and loss. Thus the temperature of each node is obtained by solving thermal
conductance matrix. Then a 3D liquidsolid coupling model is built to compare with the 2D Ttype
LPTN model. Finally, an experimental platform is established to verify the abovementioned methods,
which obtains the measured efficiency map and current wave at rated load case and overload case.
Thermocouple PTC100 is used to measure the temperature of the stator winding and iron core, and the
FLUKE infraredthermalimager is applied to measure the surface temperature of IPMSM and
controller. Test results show that the 2D Ttype LPTN model have a high accuracy to predict each part
temperature. 
Keyword 
Interior Permanent Magnet Synchronous Machine (IPMSM),LumpedParameter Thermal Network (LPTN),Thermal resistance,Thermal conductance.

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