Optimized Design And Research Of Vibration Reduction With A Permanent Magnet Synchronous Motor

Because of its small size and simple structure,permanent magnet synchronous motor(PMSM)is more and more popular in all walks of life,and is widely used in transportation,mining,medical,aerospace and other fields.In recent years,especially in the new energy automobile industry in China,the use of permanent magnet synchronous motor is more common.In normal operation,permanent magnet synchronous motor will generate vibration as well as other traditional motors.It will not only affect the performance and the duration of the motor itself,but also affect the comfort of the vehicle.Especially in some cases with higher vibration requirements,the vibration of permanent magnet synchronous motor appears to be more prominent.In the paper,an interior permanent magnet synchronous motor(IPMSM)is taken as the research object,and a two-dimensional finite element model is established by combining the basic parameters of the prototype.The flux density in two different operating conditions(no-load and rated-load)was calculated,the harmonic was analyzed;according to the Maxwell tensor formula,the radial electromagnetic force density in no-load and rated-load conditions with the space and time variation was calculated,and summarized the distribution of radial electromagnetic force density of stator tooth.Based on the distribution of radial electromagnetic force density,combined with the slotting effect and the principle of magnetic force line walk minimum reluctance path,a structure of stator tooth top arc deviation is proposed,calculation and comparison of radial electromagnetic force density by stator tooth migration at different distance.Aiming at the optimized new structure,the radial electromagnetic force density of the prototype is calculated,and the spectrum analysis is compared.The electromagnetic performance of the optimized prototype is analyzed,including the output torque average value,the torque fluctuation range and the cogging torque.Through the experiment,the measured speed,torque output and power of the basic prototype are measured.The three-dimensional finite element model was established,and the radial electromagnetic force changes with time as the load added to the stator tooth.The vibration calculation of basic prototype and optimized prototype is carried out respectively,the displacement curve is extracted and compared,and the spectrum analysis of the displacement wave is carried out at the same time.For the optimized prototype,the vibration displacement test is done,and the vibration displacement of the prototype is extracted.Meanwhile,the correctness and reliability of the finite element method is verified by comparing with the finite element calculation results.The modal analysis of stator core and whole structure is carried out,and the frequencies of low order mode shapes are obtained.At the same time,the static analysis of the rotor is carried out,and the influence rule of magnetic bridge thickness and speed on the deformation and stress of the rotor is summarized.