Abstract：A permanent magnet-assisted synchronous reluctance starter/generator (PMaSynRS/G) has high power density and short-circuit fault tolerance characteristics. It has a promising application in the aviation starter/generator system. Due to the small permanent magnet flux and large reluctance torque, zero position drifting and stability distortion of the rotor equilibrium point exist when using the pre-positioning method to calibrate its zero position. Besides, the pre-positioning method suffers from interference such as frictional torque. The previous research mainly focused on surface-mounted permanent magnet synchronous motors without involving motors with reluctance torque and modeling the impact of frictional torque. This paper analyzes the influence of the reluctance torque component on the equilibrium point and accuracy of the pre-positioning method. An approximate formula is derived for the angle error generated by frictional torque. Additionally, a reference for the selection of the positioning current is provided. Due to the torque characteristics of the PMaSynRS/G, this paper proposes a novel positioning method based on unstable equilibrium points and a parameter estimation method for the control algorithm. The proposed positioning method utilizes a PI controller with permanent magnet torque and reluctance torque to keep the rotor at an unstable equilibrium point, effectively reducing errors from frictional torque. The proposed method is based on motors’ inherent torque angle characteristics and needs to be applied in scenarios where the rotor is movable. The effectiveness of the proposed positioning error estimation model and zero calibration method is verified through experiments with a PMaSynRS/G prototype. A dynamometer is connected to the prototype to simulate the zero calibration of the machine installed in the system, which increases the frictional torque and inertia. Experimental results show that when the stator current gradually increases to over 60 A in the pre-positioning method, the original stable equilibrium point becomes unstable, and two new symmetrical stable equilibrium points are generated. The zero-position deviation is below 1.5 degrees of mechanical angle using the proposed method, while the pre-positioning method is about 9.5 degrees. The following conclusions can be drawn. (1) Based on the proposed approximate calculation method of positioning angle error, the reluctance torque component, which accounts for a large proportion of PMaSynRS/G total torque, is in the opposite direction of the permanent magnet component near the stable equilibrium point. The pre-positioning method decreases the positioning accuracy of the rotor. As the positioning current increases, the position and stability of the PMaSynRS/G rotor equilibrium points also change. (2) The proposed calibration method based on unstable equilibrium points uses the permanent magnet torque and reluctance torque, reducing the impact of frictional torque on calibration accuracy. (3) The proposed method does not require additional hardware, is easy to apply, and has high calibration accuracy. Only three parameters are needed, exhibiting high robustness.
谭越瑾, 孔武斌, 刘子睿, 李子旻, 曲荣海. 永磁辅助同步磁阻起/发电机位置传感器零位标校方法[J]. 电工技术学报, 2025, 40(14): 4494-4505.
Tan Yuejin, Kong Wubin, Liu Zirui, Li Zimin, Qu Ronghai. Position Sensor Zero-Position Calibration Method for Permanent Magnet Assisted Synchronous Reluctance Starter/Generator. Transactions of China Electrotechnical Society, 2025, 40(14): 4494-4505.
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