Analysis Of Temperature Field Distribution For Dual-Redundancy PMSM

This paper is a sub-project of “dual-redundancy permanent magnet synchronous motor with low thermal coupling and non-electromagnetic coupling between windings of each phase(DRPMSM)” which supported by National Natural Science Foundation of China. It main studies on the insulating material design, the establishment of fine motor model and temperature rise of dual-redundancy permanent magnet synchronous motor. Permanent magnet synchronous motor(PMSM) has been widely used in aerospace, precision guidance and other precision instruments due to its high power density, small volume and good controlling performance. Traditional PMSM can't satisfy the increasing need in reliability and safety, redundancy motor emerged as the times require. Although redundancy motor characterizes by its fault-tolerance performance, but many problems exist as its complex controling strategies, low efficiency and serious temperature rise when worked under fault state. Researches on temperature rise of redundancy motor have become a hot topic. Loss calculation and temperature field analysis play an important role in knowing temperature distribution in motor and motor optimization.New DRPMSM was taken as study object in the paper, prosperities of different insulating materials and their applicability according to practical situation of the motor were compared, and material of insulating board was selected. Reasonable simplification of the motor was made, and refined model of the stator winding according to the features of concentrated winding was built. Every single turn in stator slot and end region was modeled and evenly arranged. Wire paint and impregnating varnish were equivalent to insulation. Thus, the model was more in line with practical situation compared with traditional modeling approaches.Temperature rise is one of key problems motor manufacturers and scientific research institutes concerns about. Temperature distributions can be obtained through researching on temperature field. This paper calculated losses in components under two working modes, one is working at rated load in dual-redundancy, and the other is working at 0.7 times of rated load under mono-redundancy. 3D steady-state temperature distribution and heat flux in key components were obtained. Comparisons are made between simulation results and experimental results based on the structure of DRPMSM. The results show that thermal coupling between phases is low, thermal insulation board has good heat insulation performance, and verifies the efficiency of analysis method. In the end, the causes of error between experimental results and simulation results were analyzed.