基于流固耦合方法的真空泵用屏蔽电机冷却系统分析

Analysis of Cooling System of Shielded Motor for Vacuum Pump Based on Fluid-Structure Coupling Method

针对罗茨真空泵驱动电机在特殊环境下运行温升过高而导致电机烧毁的问题,通过流固耦合法综合选择合适的冷却系统,以保证电机的有效散热。以5 kW电机为研究对象,通过有限元法建立周向螺旋水路和轴向折返水路的电机仿真模型。基于流固耦合传热理论,分析电机内冷却介质的流动状态和电机温度分布,利用计算流体动力学(CFD)和温度场从流速、进出水口压差、电机鼠笼和绕组的温度分布等方面综合比较并选择更合适的冷却水路结构和尺寸配置。最后,对相应样机进行温升试验。试验数据与仿真数据吻合较好,从而验证了冷却系统设计的合理性以及仿真分析的准确性,为产品批量生产提供了科学依据。

When the Roots vacuum pump drive motor runs under some special environments,the temperature rise of the motor is too high and then causes overburning.In order to solve this problem,the fluid-structure coupling method is used to select the appropriate cooling system to ensure the effective heat dissipation of the motor.Taking a 5 kW motor as the object,the motor simulation models of circumferential spiral channel and axial zigzag channel are established by finite element method.Based on the fluid-structure coupling heat transfer theory,the flow state of the cooling medium in the motor and the motor temperature distribution are analyzed.Taking the flow rate,inlet and outlet pressure difference,and temperature distributions in the motor squirrel cage and winding into consideration,the more suitable cooling water channel structure and size configuration are selected by utilizing the computational fluid dynamics(CFD)software and temperature field analysis.Finally,the temperature rise test of the prototype is carried out,and the test results are in good agreement with the simulation data.The rationality of the cooling system design and the accuracy of the simulation analysis are verified,providing a scientific basis for mass production of the product.