Position Sensorless Control for Doubly Salient Electromagnetic Machine with Bridge Semi-Controlled Rectifier Based on Current Gradient
Zhou Xingwei1, Guo Yaowu1, Yang Zefeng1, Zhou Bo2, Zhang Li1
1. School of Electrical and Power Engineering Hohai University Nanjing 210024 China; 2. College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
Abstract：The doubly salient electromagnetic machine (DSEM) features a simple structure, high reliability, flexible magnetic field regulation, and easy demagnetization in case of failure. It is promising for applications in aviation power supplies and wind power generation. Traditional doubly salient electromagnetic generator (DSEG) often employs uncontrolled rectification generation methods. The output voltage is regulated by adjusting the field current, but this method limits the output power improvement. Compared to the uncontrolled rectification generation, the controlled rectification generation can enhance the output power by adding the armature current regulation. However, the rotor position information is required. Thus, sensorless control for the DSEM with a controlled rectifier is of great research value. Taking the DSEM with a bridge semi-controlled rectifier (BSR) sinusoidal DSEG system as an example, this paper proposes a novel sensorless control strategy based on the current gradient. Firstly, by analyzing the operating mode of the DSEG with BSR, the corresponding relationship between sinusoidal DSEG inductive electromotive force (EMF) and the current gradient is explored in the negative commutation region. A current gradient acquisition method based on pulse triggering is proposed to extract the back EMF information. Furthermore, a triggering information constraint method based on non-conductive phase judgment is proposed to avoid the error trigging caused by the reverse freewheeling. Finally, the estimated rotor position through the electrical cycle can be obtained according to the three reference angular positions and the estimated angular velocity. The current waveforms aligned with previous analyses, and the system's output voltage stabilized at the command value of 36 V, confirming the effectiveness of the controlled rectification generation for the BSR DSEG. Tests on sensorless control for the BSR DSEG were conducted. Under wide speed and load conditions, the proposed method accurately estimated the rotor position throughout the angular cycle, achieving stable sensorless controlled rectification generation for the BSR DSEG. Furthermore, dynamic performance experiments were conducted under rated excitation conditions, including acceleration, deceleration, loading, and unloading tests. The results demonstrated that the proposed method consistently provided accurate rotor position estimation under varying speed and load conditions, ensuring stable power generation operation. Conclusions can be drawn as follows. (1) The proposed pulse triggering method can accurately identify the three-phase current gradient in the negative commutation interval, achieving benchmark position estimation in this particular interval. (2) The proposed method enables accurate rotor position estimation under wide speed, load, and steady-state and dynamic conditions, facilitating the sensorless operation of the BSR DSEG. (3) The proposed method does not require prior knowledge of system parameters or additional hardware, demonstrating strong adaptability and potential for application in other DSEG generation systems.
周兴伟, 郭耀武, 杨泽锋, 周波, 张犁. 基于电流梯度的桥式半控电励磁双凸极发电机无位置传感器控制[J]. 电工技术学报, 2025, 40(6): 1784-1795.
Zhou Xingwei, Guo Yaowu, Yang Zefeng, Zhou Bo, Zhang Li. Position Sensorless Control for Doubly Salient Electromagnetic Machine with Bridge Semi-Controlled Rectifier Based on Current Gradient. Transactions of China Electrotechnical Society, 2025, 40(6): 1784-1795.
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2025, Vol. 40 
