化工泵用屏蔽电机是化工泵的主要动力源，具有运行可靠、无介质泄漏等优点，因而对其运行性能及多物理场分布情况进行分析十分重要。设计了一种用于化工泵用屏蔽电机的新型复合鼠笼结构，通过商业场路耦合时步有限元软件确定电机尺寸，并对其驱动性能进行了分析。基于流固耦合思路，对比分析了新型复合鼠笼结构以及常规纯铜鼠笼电机的三维温度场分布和应力场分布，通过试验和解析计算，验证了所设计的化工泵用屏蔽电机新型复合鼠笼结构及电机方案的合理性和可行性。在基本确保力能指标的前提下，其起动转矩倍数提高了2.6%，起动电流倍数减小了2.2%，绕组端部温度降低了3.18 ℃，电机质量和成本均有所降低。

The canned motor for chemical pump is the main power source of chemical pump. It has the advantages of reliable operation and no medium leakage. It is very important to analyze its operating performance and multiphysics distribution. A new composite squirrel cage structure is designed for the canned motor for chemical pump. The size is determined by the commercial field-circuit coupling time-step finite element software, and its driving performance is analyzed. Based on the idea of fluid-solid coupling, the three-dimensional temperature field and stress field distribution of the new composite squirrel cage structure and the conventional pure copper squirrel cage motor are compared and analyzed. Through experiments and analytical calculations, the new canned motor for chemical pump designed is verified. The composite squirrel cage structure and the motor scheme are reasonable and feasible. On the premise of ensuring the energy index, the starting torque multiple is increased by 2.1%, the starting current multiple is reduced by 2.6%, and the winding end temperature is reduced by 3.18 ℃. In addition, the weight and cost of the motor are reduced.

辽宁省科技重大专项项目(2019JH1/10100016)