真空干泵用屏蔽电机温度场仿真分析与试验

Simulation and Experiment of Temperature Field of Canned Motor for Vacuum Dry Pump

针对真空干泵用屏蔽电机在额定运行过程中温升过高导致绝缘老化,影响机组运行安全的问题,对1台4.5 kW真空干泵用水冷式屏蔽电机的水冷结构进行了设计,并进行了温度场仿真分析和试验。利用机械软件建立了屏蔽电机三维模型,借助有限元分析软件建立屏蔽电机温度场计算的仿真模型,设置热源激励和边界条件,获得了电机内各部件的温度场分布规律,并分析了冷却水流量、水道宽度、水道数及冷却水温对电机温升的影响;搭建试验平台进行温升试验,获得了从冷态起动到温升稳定过程中各部位温度,绘制温度随时间变化特征曲线。温度场分析与试验结果表明该电机设计合理,为后续的真空泵用屏蔽电机温度场分析及冷却系统的选择提供了一定的参考依据。

During the rated operation of canned motor for vacuum dry pump, insulation aging may occur when the temperature rise is too high, which threatens the operation safety of the vacuum dry pump. Aiming at this problem, the water-cooled structure of a 4.5 kW canned motor for vacuum dry pump is designed, and the temperature field simulation analysis and experiment are carried out. A three-dimensional model of the canned motor is established by using mechanical software, and a simulation model for calculating the temperature field of the canned motor is established by using finite element analysis software. By setting the thermal source and boundary conditions, the temperature field distribution in each part of the motor is obtained. An experimental platform is set up to carry put the temperature rise test, and the characteristic curves of temperature changing with time are obtained during the start process in cold condition to stable process after temperature rise. Combined with the temperature field analysis and experimental results, it showes that the internal temperature of the motor meets the thermal design requirements. This research has a certain guiding significance for the subsequent investigation of temperature field and the design of cooling system of the canned motor for vacuum dry pump.