Analysis Of A Novel Cooling Method Of Rotor And Its Industrial Applications Of The Special Motor For Vacuum Dry Pump

The drive motor of the vacuum dry pump generally uses asynchronous motor,because the vacuum degree of the air gap of the drive motor is close to vacuum,the heat generated by the loss of the rotor part is difficult to dissipate.The content of the research on the problem of the rotor heat dissipation of asynchronous motors for vacuum dry pumps are as follows:Firstly,the main dimension parameters of the motor are calculated according to the design requirements of the motor,and the structure,material and winding form of the stator and rotor of the motor are determined.According to the electromagnetic field theory,the finite element software is used to simulate and analyze the asynchronous motor for vacuum dry pump,and the magnetic field distribution diagram,magnetic density cloud map and working characteristic curve of the motor are obtained.The working state of the vacuum dry pump unit is simulated,from the ultimate vacuum to the direct discharge,the working characteristics of the driving motor applied to the vacuum dry pump unit are obtained.Secondly,the bearing,casing and shaft of the motor are drawn by drawing software,and the three-dimensional model of the motor is assembled by the finite element software,the loss of each part of the motor is taken as the heat load of the temperature field simulation,and the temperature distribution of the motor is obtained by the method of fluid structure coupling,the temperature rise test of the prototype is carried out and the winding temperature rise of the motor is obtained,which is in good agreement with the simulation results.Thirdly,the vacuum radiator applied to the rotor heat dissipation under vacuum conditions is studied,the vacuum radiator is composed of a thermoelectric power generation device and an electromagnetic emission device.According to the principle of thermoelectric power generation,the thermal energy of the rotor is converted into electrical energy.According to the thermoelectric power generation principle,the thermal energy of the rotor is converted into electrical energy;the electromagnetic emission device is to select the appropriate LED lamp according to the voltage and current generated by the thermoelectric power generation device,thereby changing the electrical energy for light energy and radiation energy,black chrome technology is applied to the inner surface of the motor casing to enhance the radiation absorption capacity of the casing and reduce the radiation emission capacity of the casing.The electric energy consumption of the vacuum radiator is calculated,and the temperature distribution of the rotor after the application of the vacuum radiator is simulated.The simulation results show that the cooling effect is obvious.A simple vacuum heat dissipation device was made for simulation experiments,the experimental results show that the thermoelectric power generation device successfully drives the electromagnetic emission device.Finally,the rotating heat pipe radiator applied to shield motor is studied,a circle of water channel is added at the bearing position of the casing to create the condensation section of the heat pipe,and a cooling fan is added at the motor position of the whole casing of the unit to increase the cooling of the condensation section,according to the temperature in the field simulation of the temperature of the rotating shaft,water is selected as the working medium,stress analysis is performed on stainless steel and copper alloy heat pipes with good adaptability to water.The stress analysis of heat pipe with different cone angle at different temperature is carried out,and the appropriate heat pipe material and size are selected considering certain safety margin.