| With a rich development and application in the field of vacuum technology,vacuum dry pump market demand is increasing.When vacuum dry pumps are used in industrial production,the pump drive motor is usually directly connected to the pump body.The cavity of the vacuum dry pump and the key components of the motor are in a vacuum environment.Therefore,the heat dissipation condition of the pump drive motor is worse than that of the conventional motor.The heat generated by the loss will also threaten the life of the key components of the motor and the reliable operation of the motor.Especially when the rotor of the motor is in a vacuum environment,it can only rely on radiation and conduction to transfer heat,which cause low heat dissipation efficiency and difficulty in heat dissipation.The permanent magnets of the conventional permanent magnet motor have the risk of high temperature demagnetization and performance degradation,and the motor bearings also have the risk of wear and seizure.The above-mentioned problems will seriously threaten the smooth and reliable operation of the vacuum dry pump.Concerning the above problems,this paper designed a 4.5k W,6000 rpm FSPM as the driving motor of the vacuum dry pump.Optimized design and comprehensive research on its key parameters and performance.First,based on the application background of vacuum dry pumps and the development status of pump drive motors,analyzed the potential advantages of FSPM in the application of vacuum dry pumps.The development characteristics,structural laws and working principles of FSPM are summarized.Preliminary design of a 12/10 pole FSPM,the output performance of the motor can meet the driving demand of the vacuum dry pump.The influence law of motor structure parameters on motor performance is analyzed.Subsequently,the influence law of motor structure parameters on motor performance is analyzed and the optimized design was performed,and the performance improvement degree of the optimized design plan and the initial design plan was compared.Among them,when the stator chamfer angle is 0.6 and the rotor chamfer angle is 0.33 in the optimized design,the cogging torque is reduced by 85.2%;the stator iron loss is reduced by 20%;the rotor iron loss is reduced by 70%;the permanent magnet eddy current loss is reduced by 64%.The results show that the optimized design scheme satisfies various design requirements,and the cogging torque and back-EMF waveform have been significantly improved,which is more suitable for the working conditions of the vacuum dry pump unit.Finally,considering the special operating environment of the vacuum dry pump unit,the temperature field and stress field of the designed FSPM are calculated and analyzed.For compare the advantages of FSPM and conventional drive motors,IM and rotor permanent magnet motors with the same power,speed and main dimensions are designed.The temperature field and stress field of the motors are compared.The results show that the maximum temperature of rotor core and bearing of FSPM motor is lower than that of conventional drive motor,and the temperature rise is smaller.Among them,the maximum temperature of the rotor is 38.15% lower than that of IM and 23.5% lower than that of IPM.The thermal stress and thermal deformation of the motor bearings are small,which reduces the risk of locking or damage to the vacuum dry pump bearings,and the operating reliability of the vacuum dry pump unit is significantly improved... |
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