This paper presents a method for transitioning between sensorless rotor position estimation methods for an interior permanent magnet synchronous motor (IPMSM). Through the proposed method, rotor position estimation over the entire speed range of the IPMSM is possible. Considering that each sensorless method governs a different speed range for estimating rotor position and speed with good accuracy, a strategy for transitioning between two methods is indispensable. In this study, a sensorless method based on extended back electromotive force (EMF) is used for high-speed operation. In addition, during low-speed operation, rotor position is estimated using the slope of measured current through the application of a zero-voltage vector. A weight function is applied to the position and speed information obtained from the two sensorless methods. The combined information is then used throughout the speed range of the IPMSM. To achieve smooth transitions, the weight function is altered based on the rotor speed in the transition region. The effectiveness of the proposed transition method was demonstrated via simulations and experiments.

本文提出了一种在内部永磁同步电动机（IPMSM）的无传感器转子位置估计方法之间转换的方法。通过提出的方法，可以在IPMSM的整个速度范围内估算转子位置。考虑到每种无传感器方法都以不同的速度范围控制以高精度估计转子位置和速度，因此在两种方法之间进行转换的策略是必不可少的。在这项研究中，基于扩展反电动势（EMF）的无传感器方法用于高速操作。另外，在低速运行期间，通过施加零电压矢量，使用测量电流的斜率估算转子位置。权重函数应用于从两种无传感器方法获得的位置和速度信息。然后在IPMSM的整个速度范围内使用合并的信息。为了实现平稳的过渡，根据过渡区域中的转子速度更改权重函数。通过仿真和实验证明了所提出的过渡方法的有效性。