Abstract
In servo control system, the current loop as the inner loop directly affects the performance of the whole control system. In engineering practice, there are delays in forward and feedback channels of current loop due to arithmetic, power switch operation, sampling and so on. Those delays will reduce the bandwidth of current loop. This paper firstly analyses and demonstrates the effects of forward channel delay and feedback channel delay to suppress the bandwidth of current loop, and then analyses the current loop in actual situation. By using the typical elements approximate processing and the closed-loop dominant pole processing method, the current loop model is simplified based on the actual situation, and the analytical solution of bandwidth related to delays is obtained. Through the analytical solution, the capability of forward channel delay and feedback channel delay in current loop bandwidth inhibition can be directly expressed, which provides a theoretical basis for practical engineering to expand current loop bandwidth.
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