油摩损耗对电潜泵用永磁电机流固耦合传热计算的影响

电潜泵用永磁电机工作在高温高压的特殊环境下，采用润滑油作为潜油电机的润滑和冷却物质，润滑油随着转子在气隙中运动。以往研究只考虑了转子油摩损耗，然而相比于空冷、水冷等冷却方式，油冷时，润滑油黏度较大的特性是不可忽略的因素。且电潜泵用电机转速较高，润滑油对定子侧产生的油摩损耗是否可以忽略及其对电机温升的影响需进一步探究。因此，以一台15 kW潜油永磁电机为例，推导出了定子油摩损耗近似解析式，提出了定子油摩损耗与转子油摩损耗的关系规律。基于计算流体力学和流固耦合传热理论，研究了气隙处流体流动特性，证明了定子油摩损耗近似解析式的准确性，得出了电机各部件温升分布，并分析了定子油摩损耗对电机的温升影响。

Influence of Oil Friction Loss on Calculation of Fluid-Structure Coupling Heat Transfer of Permanent Magnet Motor for Electric Submersible Pump

The permanent magnet motor for electric submersible pump works in a special environment of high temperature and high pressure. The lubricating oil is used as the lubricating and cooling material of the submersible motor and lubricating oil moves with the rotor in the air gap. In previous studies, only the oil friction loss of the rotor is considered. However, compared with cooling methods such as air cooling and water cooling, the higher viscosity of the lubricating oil is a factor that cannot be ignored when oil cooling. And the motor speed of the electric submersible pump is high. Whether the oil friction loss caused by lubricating oil on the stator side can be ignored and its influence on the temperature rise of the motor need to be further explored. Therefore, taking a 15 kW submersible permanent magnet motor as an example, the approximate analytical formula of the stator oil friction loss is derived, and the relationship between the stator oil friction loss and the rotor oil friction loss is proposed. Based on computational fluid dynamics and fluid-structure coupling heat transfer theory, the fluid flow characteristics at the air gap are studied. The accuracy of the approximate analytical formula for stator oil friction loss is proved. The temperature rise distribution of each part of the motor is obtained, and the influence of the stator oil friction loss on the temperature rise of the motor is analyzed.