Abstract：Aiming at the problem of starting torque fluctuation, difficulty in response information extraction and susceptibility to disturbance caused by directly injecting high-frequency signals into the main generator during position sensorless start control of aerospace three-stage synchronous motors, a novel method of indirect high-frequency signal injection through the main exciter of the three-stage synchronous motor is proposed. The method using sixth harmonics generated by three-phase AC control of main exciter as the indirect injected high frequency signal is analyzed and compared with main exciter stator side high frequency signal injection method from the aspects of frequency characteristics of the injected high frequency and rotor position detection accuracy. Besides, the method of initial position detection through the establishment of three-stage synchronous motors excitation current. Good position tracking accuracy of the two high-frequency signal injection method in the low-speed start-up stage is verified by the experimental results. It is easier to realize the three-phase AC excitation and using the generated sixth harmonic as indirect high-frequency signal injection of the main exciter, and the rotor position angle estimation accuracy is better.
薛哗, 魏佳丹, 周波. 三级式同步电机低速阶段无位置传感器起动控制高频信号注入法的对比[J]. 电工技术学报, 2018, 33(12): 2703-2712.
Xue Hua, Wei Jiadan, Zhou Bo. Comparative Investigation on Sensorless Control of Three-Stage Synchronous Motor Based on High-Frequency Injection Method at Low Speed. Transactions of China Electrotechnical Society, 2018, 33(12): 2703-2712.
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2018, Vol. 33 
