在工业伺服控制领域，常采用陷波滤波器抑制机械谐振，而准确地获取谐振频率是谐振成功抑制的首要条件。采用二阶广义积分器-锁频环(SOGI-FLL)分析速度控制器输出信号以检测谐振频率。首先介绍了SOGI-FLL的基本结构及锁频环的工作原理，然后分析了幅值频率自适应SOGI-FLL的频率响应性能，最后通过仿真和试验验证了幅值频率自适应SOGI-FLL能准确且快速地测出谐振频率，将所测频率用于陷波滤波器参数设置，成功抑制了机械谐振。

In the field of industrial servo control, notch filter is often used to suppress the mechanical resonance, and accurate acquisition of resonance frequency is the primary condition for the successful suppression of resonance. The second-order generalized integrator-frequency-locked loop (SOGI-FLL) is used to analyze the output signal of speed controller in order to detect the resonance frequency. Firstly, the basic structure of SOGI-FLL and the operating principle of frequency-locked loop are introduced, and then the frequency response performance of amplitude-frequency adaptive SOGI-FLL is analyzed. Finally, simulation and experiment show that the amplitude-frequency adaptive SOGI-FLL can measure the resonance frequency accurately and quickly. The measured frequency is used to set the parameters of notch filter, and the mechanical resonance is restrained successfully.