以用于轨道交通的六相横向磁场磁通切换直线磁悬浮电机（SPTMFFSLMSM）为研究对象。该电机电枢绕组、励磁绕组以及永磁体都在动子铁心上，可同时实现牵引、悬浮与导向。由于SPTMFFSLMSM结构特殊，因此电机散热比较困难，极易引起电机的温升，从而影响电机的运行特性。为解决动子铁心温升严重的问题，设计了一套冷却系统，确保电机正常运行。首先，根据电机的结构建立了三维稳态温度场数学模型，并推导出边界条件；然后，确定电机内部各种材料的热参数，对电机的热源和损耗进行分析，计算得到对应的生热率；最后，采用三维有限元法分析电机在自然散热和强迫水冷下的温度场，并对比两种散热方式下的温度分布。结果表明采用水冷装置降低了动子铁心的温度，验证了所设计冷却系统的有效性和可行性。

This study focused on the six-phase transverse magnetic field flux switching linear magnetic suspension motor (SPTMFFSLMSM) used in rail transit. The armature windings, excitation windings, and permanent magnets are all located on the mover iron core, enabling the motor to achieve traction, levitation, and guidance simultaneously. Due to the unique structure of the SPTMFFSLMSM, heat dissipation is challenging, which can lead to significant temperature rise and negatively affect the motor′s operating characteristics. To address the issue of severe temperature rise in the mover iron core, a cooling system was designed to ensure normal motor operation. First, a three-dimensional steady-state temperature field mathematical model was established based on the motor′s structure, and the boundary conditions were derived. Then, the thermal parameters of various materials inside the motor were determined, and the motor′s heat sources and losses were analyzed, with the corresponding heat generation rates calculated. Finally, the motor′s temperature field was analyzed using a three-dimensional finite element method under both natural cooling and forced water cooling conditions, and the temperature distributions of the two cooling methods were compared. The results showed that the water cooling system effectively reduced the temperature of the mover iron core, verifying the effectiveness and feasibility of the designed cooling system.