Thermal Model and Experimental Test of Tubular Permanent Magnet Linear Motor

The moving magnetic cylindrical Tubular Permanent Magnet Linear Motor (moving magnetic type TPMLM) has a large charged coil, high output thrust density and high current density, so the high heat generated by copper loss and iron loss will seriously affect normal operation. In this paper, the thermal research of TPMLM is carried out through theoretical analysis, simulation analysis and experimental test, which provide the necessary basis for motor design. According to the theoretical calculation and the 3D finite element model, the temperature field distribution and the thermal equilibrium phenomenon of the motor are obtained. In the no-load experimental test of TPMLM, the temperature in the middle part is too high and at both ends is low. The main reason of difference is the excessive length and the poor convective heat transfer capacity. In addition, the input excitation current is the main cause of the temperature fluctuation. In study, the thermal changes of experimental research and theoretical analysis are basically consistent, which proves that the thermal model can accurately calculate the temperature distribution of the motor. So, on the basis of this model, it is put forward that adding cooling rib or setting winding heat pipe for cooling may result in better cooling effect.