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On the Implementation of Frequency Response Estimation Method of Electric Drives

Identification of a frequency response function of a plant is an important stage in a tuning process of a servo drive control system. This article presents a design and implementation method of a frequency response function estimation. A proposed solution is based on an empirical method, when a series of injection signals with various frequencies are used. Then, the frequency response function is estimated using the Fourier transformation of an input and an output signal of the plant. There is proposed a separation of the estimation process between a human machine interface and a servo controller to reduce the servo controller loading. In this case, the servo controller generates the injection signal, collects and sends the data to human machine interface which realizes mathematical functions of the frequency response estimation. The designed method could identify any desired frequency response function using corresponding injected and collected signals. It was successfully used for experimentally identification of as a resonance plant such as a LCL filter of active front end.