横向磁场电励磁磁通切换磁悬浮直线电机温度场有限元分析

研究用于轨道交通的横向磁场电励磁磁通切换磁悬浮直线电机特殊结构下的温升问题，设计冷却系统以保证电机正常运行。分析电机的结构和运行原理，建立了三维稳态温度场数学模型，并推导出边界条件方程。考虑电机各部分热交换的情况，确定各材料的导热系数以及电机不同部分的对流换热系数。通过有限元方法计算出电机的铜损耗与铁损耗，并求出相应的生成热。利用三维有限元法对电机不同工况下的温度场进行计算，得到了电机铁心、电枢、励磁绕组的温度场分布情况。最后，设计冷却系统，比较自然风冷和强制水冷的温度分布，证明该冷却系统装置的可行性和合理性。

Finite Element Analysis of Temperature Field of Transverse Magnetic Field Flux Switched Electric Excited Magnetic Suspension Linear Motor

The temperature rise problem of magnetic suspension linear motor with transverse magnetic field, electric excitation and flux switching is studied, and the cooling system is designed to ensure the normal operation of the motor. The structure and operation principle of the motor are analyzed, and the three-dimensional steady-state temperature field mathematical model are established, and the boundary condition equation are derived. Considering the heat exchange of each part of the motor, the thermal conductivity of each material and the convective heat transfer coefficient of different parts of the motor are determined. The copper loss and iron loss of the motor are calculated by finite element method, and the corresponding heat of formation is obtained. The three-dimensional finite element method is used to calculate the temperature field under different working conditions of the motor, and the temperature field distribution of the motor core, armature and excitation winding is obtained. Finally, the cooling system is designed, and the temperature distribution under natural air cooling and forced water cooling conditions is compared, which proves the feasibility and rationality of the cooling system.