Rotor Optimization Design And Electromagnetic Characteristics Analysis Of High Speed Permanent Magnet Synchronous Motor

In recent years,more and more attention has been paid to high-speed permanent magnet motor,and higher requirements have been put forward for its performance.Rotor as an important part of the motor,the optimization design of the rotor can improve the working efficiency of the motor,and reduce its vibration and noise,but also affect its mechanical strength and electromagnetic characteristics.Under this background,the high-speed permanent magnet motor was taken as the research object.Given its mechanical strength,the design of the rotor was optimized to reduced the motor loss and cogging torque.Finally,the electromagnetic characteristics of the optimized motor was analyzed in detail.The main contents included the following aspects:(1)Rotor structure design and optimization of high speed permanent magnet synchronous motor.This paper took permanent magnet synchronous motor as the research object,designed its stator and rotor structure,mainly analyzed the advantages and disadvantages of different rotor structures,and determined the structure and size parameters of the stator and rotor,respectively.The optimal design of the rotor sheath was carried out,and the appropriate sheath thickness was selected considering the rotor stress and eddy current loss.(2)The optimization design of rotor pole parameters.This paper analyzed the methods of reducing cogging torque by optimizing the parameters of rotor pole,and studied the cogging torque under different parameters of rotor pole by using ANSYS Maxwell.However,the mechanical stress of rotor was also affected by the parameters of rotor magnetic pole,so using ANSYS Workbench,the mechanical stress of the rotor under different rotor pole parameters was analyzed,and the optimal rotor pole parameters were selected when the rotor strength was satisfied.Finally,the basic dynamic characteristics of the rotor were analyzed,and the modal response and critical speed of the rotor were studied by finite element software.(3)The analysis of electromagnetic characteristics of high-speed permanent magnet synchronous motors.The electromagnetic performance of the motor under no-load and load was simulated,and the distribution of magnetic field lines,magnetic flux density,air-gap magnetic density,and back EMF size and waveform were analyzed respectively.The magnetic flux density and the size of the three-phase current and torque when the motor loaded were also studied.After that,the theoretical calculation model of air-gap magnetic density and electromagnetic torque was established.Using the finite element software,the air-gap magnetic density and electromagnetic torque under different rotor pole parameters were analyzed in detail,and the effects of rotor magnetic pole parameters on them were discussed respectively.(4)Performance test of high speed permanent magnet synchronous motor.The cogging torque and back EMF of the prototype with the power of 4kw and the speed of 60000 r/min were tested,and the results were compared with the simulation results of the finite element simulation.The results are consistent,the accuracy of the finite element analysis results is verified.