针对用于驱动数控机床的可控励磁直线磁悬浮同步电机特殊结构，对磁热耦合机理进行研究。分析电机在不同电枢电流时磁场对温升的影响，建立该电机二维温度场中热传导的微分方程、热对流的牛顿冷却公式以及温度场的边界条件；确定电机不同材料的导热系数及对流换热系数，给出对流换热系数的解析表达式。采用ANSYS有限元仿真磁热耦合分析方法，分析电机主要热源，应用ANSYS Maxwell软件计算其定子、转子损耗，以此作为电机热源导入Workbench软件对其进行热分析，得到该电机通入不同电枢电流时的温度分布云图。仿真结果表明，可控励磁磁悬浮直线同步电机内发热主要集中在绕组处，随电枢电流的增加而增大。温度场计算数据可为电机设计提供依据。

Aiming at the special structure of the controllable excitation magnetic levitation linear synchronous motor used to drive the CNC machine tool, the magnetic-thermal coupling mechanism is studied. The influence of the magnetic field on the temperature rise of the motor at different armature currents is analyzed. The differential equation of heat conduction in the two-dimensional temperature field of the motor, the Newtonian cooling formula of heat convection and the boundary conditions of the temperature field are established. The thermal conductivity and convective heat transfer coefficient of different materials of the motor are determined, and the analytical expression of the convective heat transfer coefficient is given. Using ANSYS finite element simulation method in the magnetic-thermal coupling analysis, the main heat sources of the motor are analyzed. The ANSYS Maxwell software is used to calculate the motor stator and rotor losses, which are used as the motor heat source and imported into the Workbench software for thermal analysis to obtain the temperature distribution cloud diagram of the motor when different armature currents are applied. The simulation results show that the heat in the controllable excitation magnetic levitation linear synchronous motor is mainly concentrated in the windings，and the temperature increases with the increase of the armature current. The calculated data of temperature field can provide the basis for motor design.

国家自然科学基金项目(51575363)