由于三次谐波的影响，三相永磁同步电机的无位置传感器控制方法无法直接应用于五相永磁同步电机无位置传感器控制。在考虑三次谐波电压和电流的条件下，提出一种基于自适应滑模观测器的五相永磁同步电机无位置传感器控制方法。该方法首先利用带三次谐波的五相永磁同步电机模型设计了滑模观测器，并用sigmoid函数代替一般滑模观测器常用的符号函数作为观测器的开关函数，以减小滑模抖动并获得更为准确的反电势当量信号。其次设计了反电势自适应观测器以估计电机转速和位置信号，消除了常规无位置传感器控制系统中所必需的低通滤波器和相位补偿单元，提高了转速和位置信号的估计精度。此外，利用李雅普诺夫准则，证明了所设计的滑模观测器和反电势自适应观测器的稳定性，并利用Matlab／Simulink进行了仿真实验。仿真结果显示，与常规滑模观测器相比，所提出的自适应滑模观测器在五相永磁同步电机无位置传感器控制系统中抖动更小，转速和位置估计误差更小，反电势估计更为准确，具有较强的鲁棒性。%For the impact of the third harmonic, the sensorless control method for three⁃phase permanent magnet synchronous motor ( PMSM) can′t be applied for five⁃phase PMSM directly. This paper investigates the position sensorless control problem of five⁃phase PMSM drive system based on an adaptive sliding mode observer ( ASMO) with the consideration of the third harmonic voltage and current. First, a sliding mode current observer is designed based on the five⁃phase PMSM model with the third harmonic by replacing the conventional sign function with the sigmoid function as the switching function to reduce the chattering and obtain the equivalent signal of the back elec⁃tromotive force ( EMF) . Then, an adaptive observer of back EMF is built to estimate the back EMF, the velocity and the rotor position of five⁃phase PMSM, which eliminates the low⁃pass filter and phase compensation module in sensorless control system and improves the estimation accuracy. Meanwhile, the stability of the sliding current ob⁃server and the back EMF adaptive observer is demonstrated in detail by Lyapunov stability criteria and the simula⁃tion is done by Matlab/Simulink. The simulation results show that compared with the conventional SMO, the pro⁃posed ASMO is with less chattering, small errors of rotor speed and position, more accurate estimated value of back EMF and strong robustness.
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