基于随机零矢量SVPWM控制策略的内置式永磁同步电机电磁振动抑制OA

[Objective]In inverter-fed interior permanent magnet synchronous motor(IPMSM),harmonic currents and the associated radial electromagnetic forces are primary sources of electromagnetic vibration and noise.Conventional control strategies usually target either low frequency or high frequency vibration suppression,resulting in limited effectiveness over a wide frequency range.This paper proposes an improved control strategy for coordinated suppression of low-and high-frequency electromagnetic vibration.[Methods]A random zero-vector SVPWM strategy based on Logistic mapping and Markov chains was first employed to generate uniformly distributed random zero-vector sequences,which dynamically adjust inverter switching instants to suppress high-frequency harmonics around the switching frequency.Meanwhile,a virtual sinusoidal signal injection method was incorporated into the maximum torque per ampere control scheme to optimize the current vector angle at the current control level,thereby reducing low-order harmonic currents and mitigating low-frequency electromagnetic vibration.[Results]The results indicated that,compared to the traditional control strategy,the proposed control strategy had reduced the harmonic distortion rate of A-phase current to 5.53％and achieved a maximum vibration acceleration reduction of 65.96％,significantly improving the electromagnetic vibration performance of the motor.[Conclusion]The proposed control strategy effectively suppresses both low-frequency and high-frequency harmonic currents and weakens the corresponding radial electromagnetic force components,enabling coordinated suppression of low-frequency and high-frequency electromagnetic vibration in IPMSM.The results confirm its practical potential for electromagnetic vibration and noise reduction in electric drive systems.