超洁净真空泵用永磁同步电动机多物理场分析

发布时间：2018-04-26 20:56

本文选题：真空泵 + 永磁同步电动机　；参考：《沈阳工业大学》2017年硕士论文

【摘要】：随着我国科学技术水平不断的提高,越来越多的行业需要真空环境进行生产作业,对真空泵的需求量越来越大。传统真空泵都是采用异步电动机,由异步电动机的运行特性可知,转子铝耗使得转子的温度升高。由于屏蔽套内为高真空状态,失去了热对流的散热条件,转子只能通过热传导和热辐射进行散热,转子温度越来越高,热量通过热传导传递给轴承,使得轴承内圈温度升高。由于轴承内外圈散热条件不同,使得轴承内圈的温度远高于外圈的温度,内外圈发生不同程度的膨胀,轴承的有效游隙减小,长时间运行下来,经历漫长的动态过渡过程,轴承滚道内润滑油油膜难以建立,滚动球体受到挤压,最终可能导致轴承因滚动球体摩擦力过大而胶合抱死,后果不堪设想。本文通过设计真空泵用永磁同步电动机,来解决传统真空泵转子温度过高,轴承内外圈温度差较大,运行稳定性较差等问题。首先,对真空泵的结构特征进行介绍,根据屏蔽电动机的设计特点,对真空泵用异步电动机的转子结构进行改造,设计真空泵用永磁同步电动机,采用有限元分析软件Ansoft进行电磁场仿真计算,验证其电磁设计的合理性,对比分析真空泵用永磁同步电动机和真空泵用异步电动机的性能特性。然后,将真空泵用永磁同步电动机各部分损耗作为温度场的负荷,利用有限元分析软件Ansys workbench分析其温度场,对比分析真空泵用永磁同步电动机与真空泵用异步电动机屏蔽套、转子和轴承的温度场分布特性。为了进一步提高真空泵用永磁同步电动机的稳定性,在转子和转轴表面进行处理,提高其辐射率,并进行对比分析。最后,将温度场作为热负荷,加载到应力场中,仿真计算三种结构的真空泵用屏蔽电动机屏蔽套和轴承的应力场分布特性,并且进行对比分析,得出结论。通过仿真分析可以得出真空泵用永磁同步电动机性能优于真空泵用异步电动机,并且可以有效的提高真空泵运行的稳定性和可靠性。当转子和转轴表面进行处理后,提高其辐射率,真空泵用永磁同步电动机效果更加明显。对真空泵用驱动电动机进行实验测试,通过对实验数据的整理,验证仿真分析的可靠性。
[Abstract]:With the development of science and technology in our country, more and more industries need vacuum environment to operate, and the demand for vacuum pump is increasing. The traditional vacuum pump uses asynchronous motor. According to the operating characteristics of the asynchronous motor, the rotor temperature is increased by the aluminum consumption of the rotor. Because of the high vacuum state in the shield sleeve, the heat dissipation condition of heat convection is lost, the rotor can only dissipate heat through heat conduction and heat radiation. The temperature of rotor is higher and higher, and the heat is transferred to the bearing through heat conduction, which makes the temperature of the inner ring of the bearing rise. Because of the different heat dissipation conditions of the inner ring of the bearing, the temperature of the inner ring of the bearing is much higher than that of the outer ring, and the inner ring of the bearing expands in varying degrees, the effective clearance of the bearing decreases, the bearing runs down for a long time, and it goes through a long process of dynamic transition. The lubricating oil film in the bearing raceway is difficult to establish and the rolling ball is squeezed, which may result in the bearing being glued and locked because of the excessive friction of the rolling ball, and the consequences are unimaginable. In this paper, the permanent magnet synchronous motor used in vacuum pump is designed to solve the problems of high rotor temperature, large temperature difference of bearing inner ring and outer ring, and poor operation stability of traditional vacuum pump. First of all, the structural characteristics of vacuum pump are introduced. According to the design characteristics of shielded motor, the rotor structure of asynchronous motor for vacuum pump is reformed, and the permanent magnet synchronous motor for vacuum pump is designed. Finite element analysis software Ansoft is used to simulate electromagnetic field to verify the rationality of electromagnetic design. The performance characteristics of permanent magnet synchronous motor for vacuum pump and asynchronous motor for vacuum pump are compared and analyzed. Then, the loss of permanent magnet synchronous motor (PMSM) for vacuum pump is taken as the load of temperature field, and the temperature field is analyzed by finite element analysis software Ansys workbench, and the shielding sleeve of PMSM for vacuum pump and asynchronous motor for vacuum pump is compared and analyzed. Temperature field distribution characteristics of rotor and bearing. In order to improve the stability of permanent magnet synchronous motor (PMSM) for vacuum pump, the surface of rotor and shaft is treated to improve the emissivity. Finally, the temperature field is taken as the thermal load and loaded into the stress field, and the stress field distribution characteristics of shielding motor shield sleeve and bearing for three types of vacuum pump are simulated and analyzed, and a conclusion is drawn. The simulation results show that the performance of permanent magnet synchronous motor for vacuum pump is better than that of asynchronous motor for vacuum pump, and the stability and reliability of vacuum pump can be improved effectively. When the surface of rotor and shaft is treated, the emissivity of permanent magnet synchronous motor for vacuum pump is improved. The reliability of the simulation analysis is verified by sorting out the experimental data of the vacuum pump driving motor.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM341;TB752

【参考文献】