Research on current harmonic suppression strategy of HSPMSM based on super twisting sliding mode control

To tackle the issue of inadequate filtering of current harmonics in high-speed permanent magnet synchronous motors (HSPMSMs) caused by inverter nonlinearities and motor design, a harmonic suppression strategy based on the super twisting sliding mode control algorithm is proposed. Firstly, a mathematical model of HSPMSM containing harmonics was established; finally, a harmonic extraction module based on the Butterworth filter was designed, which obtains the DC quantity of a specific order of harmonics by setting the frequency in the d–q coordinate system. Experimental results demonstrate that implementing this harmonic suppression algorithm significantly reduces the amplitudes of the fifth and seventh harmonic currents from 38.4 and 28.8 dB to 21.3 and 13.2 dB, respectively. This method improves the suppression of fifth and seventh harmonics, thereby enhancing the operational stability of HSPMSM.