Lumpedparameter thermal model analysis and

thermal parameters test for PMSM

 

WANG Wenbo, CHEN Yangsheng

(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

 

Abstract: Aiming at calculate the temperature of permanent magnet synchronous motors(PMSM) rapidly, lumpedparameter thermal model of PMSM was analyzed. A lumpedparameter thermal model including the mounting plate was established to predict the temperature rise for PMSM. With dc test method proposed in this paper, these thermal parameters were tested: the equivalent thermal resistance between housing and ambient, the equivalent thermal resistance between end caps and ambient, the equivalent thermal resistance between mounting plate and ambient; the equivalent thermal conductivity between winding and lamination; the interface gap between housing and lamination, the interface gap between end caps and housing, and the interface gap between mounting plate and end caps. The sensitivity of thermal parameters was studied to identify the key part which will influence the thermal performance. The steady performance of the thermal model was validated by experiments on a test motor. The results indicate that the thermal model and tested parameters can calculate the temperature of motors accurately, with only 5% error.

Key words: permanent magnet synchronous motors(PMSM); lumpedparameter thermal model; thermal parameter determination; sensitivity analysis