中文摘要：

由于大型潜水电机中的电磁场环境非常复杂，电机端部损耗和温升的计算也变得困难。本文针对于水冷式潜水电机端部建立了三维磁热耦合分析计算模型，通过有限元法分析了端部涡流场、磁场及温度场的分布状况，计算了端盖及边框涡电流与表面损耗的大小。并根据电机端部电磁场的分析，提出了一种以降低端部损耗与温升为目的的改进型定子压板。对比分析发现，对于该型号水冷式潜水电机，使用改进型定子压板可以有效的降低电机端部的损耗和温升。本文的结论可为大型水冷式潜水电机的优化设计提供参考。

英文摘要：

Due to the complex leakage electromagnetic field in the large submersible motor, it is difficult but also important to calculate the loss and temperature of the motor end region precisely. In this paper, the three dimensional （3D） coupled magnetic-thermal analysis model of submersible motor end region was established. The eddy current field and the magnetic field distribution were obtained by the finite element method, and the characteristics of the temperature distributions of the end structures were also analyzed. The eddy current of the pressboard as well as the surface loss of the end shield and frame was evaluated. Based on the electromagnetic analysis of end region, an improved shape of the stator pressboard was proposed for loss and temperature reduction. Finally, both the loss and temperature distributions of the end structures were compared in detail between the improved and the original. The results indicated that motor with improved stator pressboard could reduce both the loss and temperature- rise of the end region for water filling submersible motor. The useful conclusions could provide a reference for further optimization designs of large water filling submersible motors.