Features of frequency analysis of torque control loop in ac electric drives

Abstract

In the article, the structural scheme of the synchronous motor torque control channel is shown and mathematically described. Passing of a sine signal in the torque control loop is considered, equations for describing the dynamic properties of the current control loop are given. Specific features relating to the frequency characteristics of the channel for controlling of the electromagnetic torque in the adjustable variable speed drive with synchronous electric machines are considered. The control channel is regarded as a linear system with amplitude modulation. A comparative analysis of the experimental and calculated Bode plots of the current and torque control loops is carried out.