Optimization Design And Fluid Field Calculation Of High-speed Amorphous Alloy Permanent Magnet Motor

High speed permanent magnet motor has the characteristics of high power,high torque,small size and poor heat dissipation conditions.During its runtime more loss and higher temperature rise than ordinary motor leads to relative lower efficiency and even demagnetization fault.It is necessary to optimize the design of the motor,analyze the loss and temperature distribution of the motor combined with the fluid field of the cooling structure.Firstly,the time stepping finite element simulation calculation is adopted to compare and analyze the four magnetization methods of permanent magnet.Halbach array magnetization has been proved having the better electromagnetic performance through the comprehensive analysis and comparison of the fundamental magnetic density amplitude and harmonic distortion rate.Based on Taguchi method and orthogonal test,parameters have been optimized for the rotor magnetic pole structure of Halbach array combined with combined magnetic pole.Specifically,the thickness of magnetic steel,the angle of low magneto energy product material,the Halbach magnetization angle and the coercivity of low magneto energy product material are the four optimized parameters.Meanwhile.a 2-pole amorphous motor and a 2-pole silicon steel motor are designed,both of which are magnetized in parallel.Then,taking the 50kW,48000r/min amorphous alloy high-speed permanent magnet motor as an example.the loss of each part of the motor is analyzed.The motor loss is selected as the heat source.The temperature field of the amorphous motor is calculated,and the temperature increasement of the motor under rated condition is obtained.Finally.the finite element calculation of high-speed permanent magnet motor with circumferential spiral water-cooling structure is carried out.The fluid field and temperature distribution under different cooling conditions are analyzed,and the appropriate initial flow rate and initial temperature of cooling water are determined.The research contents of this thesis lay a good foundation for the design and operation of amorphous alloy high speed permanent magnet motor.