Pulsating high-frequency voltage injection is an effective method for estimating the initial rotor position for interior permanent magnet synchronous motors (IPMSMs). This method is based on the magnetic saliency of a motor rather than a back-electromotive-force (back-EMF) model. In addition, it is feasible when the motor is static or in low-speed operations. However, accurate estimation of the rotor position is realized on the assumption that the direct-axis and quadrature-axis of the motor are completely decoupled, which is not always satisfied. Then, the mutual inductance between the two axes introduces a theoretical error into the rotor position estimation. In this paper, the theoretical error of the rotor position estimation caused by mutual inductance is deduced. An improved initial rotor position estimation method is proposed to eliminate harmonic theoretical errors by injecting high-frequency voltage in the decoupling coordinate system. Finally, the effectiveness of this method is verified by experimental results.

脉动高频电压注入是估计内置永磁同步电机 (IPMSM) 初始转子位置的有效方法。这种方法基于电机的磁凸极，而不是反电动势（反电动势）模型。此外，在电机静止或低速运行时也是可行的。然而，转子位置的精确估计是在电机的直轴和交轴完全解耦的假设下实现的，这并不总是令人满意。然后，两个轴之间的互感将理论误差引入转子位置估计中。本文推导了互感引起的转子位置估计的理论误差。提出了一种改进的转子初始位置估计方法，通过在解耦坐标系中注入高频电压来消除谐波理论误差。最后，通过实验结果验证了该方法的有效性。