Current-Voltage Angle Feedback Linearization Based Field Weakening Control Strategy for Suppressing Current Harmonics of High-Speed SPMSM Drives

The voltage angle regulation field weakening (FW) strategy can avoid the issue of output voltage saturation. However, the frequency characteristic of its transfer function exhibits resonance peaks at operating frequencies, leading to an increase in current harmonics. This article proposes a current-voltage angle feedback linearization based FW strategy to suppress the current harmonics of the high-speed surface-mounted permanent magnet synchronous motor (SPMSM). By constructing the linear intermediate variable and designing the voltage angle transformation law, the nonlinear voltage angle regulation model is transformed into a linear control model. Based on this, feedback decoupling in the equivalent linear model can be established to modify the frequency characteristic. The controller coefficients are optimized according to the damping ratio of the system’s dominant poles to ultimately eliminate the resonance peaks. Besides, the integral sliding mode control is employed to adaptively compensate for feedback decoupling and voltage angle transformation deviations caused by motor parameter mismatch, which enhances the robustness of the feedback linearization control. Experimental results demonstrate the proposed method effectively suppresses the stator current harmonics at operating frequencies and reduces current ripples under motor parameter mismatch conditions.