Three-Dimensional Finite Element Analysis and Experiment of Temperature Rise of Permanent Magnet Linear Synchronous Motor

Permanent magnet linear synchronous motors (PMLSM) are widely used in semiconductor processing, laser cutting, inspection and precision positioning because of high thrust density, high power density, high acceleration, fast response, good reliability and high precision. The torque of the PMLSM is proportional to the input current, that is, to output large electromagnetic thrust, the PMLSM needs a large input current. The large current will cause large losses, mainly copper loss in the winding, which will eventually heat up the winding and other parts and cause temperature rise. High temperature rise will reduce the motor’s insulation life or even destroy the insulation, which will reduce the performance of the motor or cause the motor failure. Thus, by studying and analyzing the temperature rise of PMLSM, it is beneficial to achieve rational design or motor operating condition prediction. In this paper, finite element modeling analysis of the three-dimensional temperature field of the motor is conducted based on a linear motor test rig, which includes a linear motor, a sliding table, a linear bearing, a linear module base and a marble platform. The finite element analysis results are compared with the experiment results and they are consistent. This paper provides a reference method for linear motor temperature rise analysis.