Aiming at the complicated design and large computation problem of the present initial rotor position estimation method for interior permanent magnet synchronous motor (IPMSM) , an improved initial rotor position estimation method based on rotating high-frequency signal injection and Fourier algorithm is proposed in this paper. Phase shift and Fourier algorithm were used to obtain the preliminary estimation of rotor position from the response current, and the nonlinear characteristic of magnetic saturation was utilized to identify the rotor pole polarity. Finally the initial rotor position was determined by synthesizing the results above, and furthermore the effect of the nonlinear factor such as dead-time was analyzed. On that basis, methods such as using displacement instead of phase-shift filter (by selecting proper frequencies of the pulse width modulation ( PWM) and injected signal) , using averaging filter was proposed to improve the realization process. In the end, the verification experiments were implemented on the experimental platform. The experimental results show that the proposed method obtains the initial rotor position quickly and accurately (the estimation error is less than 6 electrical degrees), and it is simpler to realize and needs less computation than the traditional methods, which makes it suitable for engineering applications.%针对现有内置式永磁同步电机(IPMSM)转子初始位置估计方法设计复杂与计算量大的问题,提出了基于旋转高频信号注入和傅氏算法的改进方法.使用移相和傅氏算法从响应电流中提取转子位置初步估算值,利用磁路饱和特性获得转子磁极方向,综合其结果得到转子初始位置,并对死区效应等非线性因素对该方法的影响进行了分析.在此基础上提出使用移位代替移相滤波器(通过选择适当的PMW频率和注入信号频率)、平均滤波等方法改进算法实现.在实验平台上完成验证实验,实验结果表明本文提出的方法能够快速且准确地估算出IPMSM转子初始位置(误差小于6°电角度),并且该方法相比传统方法更容易实施、计算量更小,适合工程应用.
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