In this article, an initial rotor position estimation method for an aircraft three-stage starter/generator (TSSG) based on self-injected harmonic signal (SIHS) is proposed. Different from the traditional method in which an external high-frequency signal is injected into the stator winding of the main generator (MG), the second harmonic voltage caused by the rotating rectifier in the ac excitation is regarded as the self-injected high-frequency signal into the rotor field winding of MG at standstill. The high-frequency response signals in the stator winding of MG are extracted by a designed bandpass filter (BPF), and the signals orthogonal to the response signals are generated by a cascaded all-pass filter (APF). Then, based on the obtained response signals and orthogonal signals containing rotor position information, a practical approach to estimate the initial rotor position is implemented, where the induced currents in the excitation establishment of MG are detected to identify the polarity of the initial rotor position angle. Finally, the feasibility and effectiveness of the proposed method are verified by simulation and experimental results.

中文翻译：

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基于自注入谐波信号的飞机三级启动/发电机转子初始位置估计方法

在本文中，提出了一种基于自注入谐波信号（SIHS）的飞机三级启动/发电机（TSSG）转子初始位置估计方法。不同于传统的将外部高频信号注入主发电机（MG）定子绕组的方法，交流励磁中旋转整流器引起的二次谐波电压被视为自注入高频信号进入 MG 的转子励磁绕组。MG 定子绕组中的高频响应信号由设计的带通滤波器 (BPF) 提取，与响应信号正交的信号由级联全通滤波器 (APF) 生成。然后，基于获得的响应信号和包含转子位置信息的正交信号，实现了一种估计转子初始位置的实用方法，其中检测 MG 励磁建立中的感应电流，以确定转子初始位置角的极性。最后通过仿真和实验结果验证了所提方法的可行性和有效性。