永磁同步电动机PWM电压源型逆变器输出电压存在着电压畸变，而且电压畸变会随着运行条件，例如温度、电流方向以及功率器件的非理想特性呈现非线性变化。非线性电压畸变还将引起电机电流畸变，进而导致转矩脉动，影响了整个电机伺服系统性能的提高。本文提出了一种考虑永磁同步电动机参数不确定性的自适应参数预测的电压在线补偿策略。实验结果表明该方法可以有效提高电机电流的正弦度，改善了PWM电压源逆变器的输出性能。

Generally, there exists a voltage distortion in the output voltages in a pulse-width modulation (PWM) voltage source inverter (VSI). Nonlinearity varies with the operating conditions such as the temperature, device nonlinear character and the phase current level. Also, the nonlinearity affects the machine current distortions, torque pulsations, and degradation of control performance. In this paper, the nonlinearity in a PWM VSI is analyzed and new on-line voltage method is proposed to compensate the time varying voltage distortion based on the adaptive parameter estimation, considering the parameter uncertainty for a permanent magnet synchronous motor (PMSM). Experimental results shows that the proposed method can make motor current waveform sinusoidal, and improved the output performance of the PWM VSI