Cooling system of direct drive PMSM for mining belt conveyor
                                                                  WEI Qiang, FENG Guihong, ZHANG Bingyi
                          (School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China)

Abstract: Aiming at the problem of high temperature rise and difficult cooling of direct drive permanent magnet motor for mining belt conveyor, the cooling effect of axial triangular steel channel, axial straight channel type and radial spiral channel was compared and analyzed. Firstly, the basic scheme of the electromagnetic design of the motor and the physical model of the three waterway structures were given. The calculation method of field and circuit was used to calculate the copper loss, iron loss, permanent magnet eddy current loss, stray loss and wind wear of the motor. Threedimensional simulation models of waterway structures were established. The temperature distribution of the motor under different cooling channels was obtained. The temperature rise test was performed，the temperature rise experimental data under the rated load of the motor was collected and compared with the simulation results. The research results show that the experimental data is in good agreement with the simulation data, which verifies the correctness of the simulation. The cooling effect of the triangular steel cooling channel is the best, and the cooling effect of the straight cooling cooling channel is poor.

Key words: direct drive permanent magnet motor; cooling channel; temperature rise