Positional Asynchronous Electric Drive with Vector Control and Non-Linear Correction

The urgency of the study is determined by the need to improve the control system of the positional electric drive, ensuring the execution of the specified movement by the executive mechanism with the maximum possible fast-action and the required indicators of the quality of the transient process. The aim of the paper is to increase the fast-action of a positional asynchronous electric drive with vector control. Nonlinear correction is realized on the basis of a microprocessor control system of an asynchronous electric drive. The algorithm of the non-linear correction program has two stages. At the first stage, the motion of the electric drive with the limiting acceleration is formed. To do this, a positive feedback proportional to the engine speed is applied, valid until the error (mismatch) in the speed loop exceeds the calculated switching value. At the second stage, the electric drive is effectively braked to produce a monotonic transient motion process. This is achieved by disabling positive and enabling negative speed feedback in the error function of mismatch. The time for working off a set position is reduced by almost 30% according to the mathematical modelin carried out in the Matlab (Simulink) software environment with respect to the movement of the balancing machine portal. The obtained result allows one to draw a conclusion about the advisability of using nonlinear correction in positional asynchronous electric drives with vector control and coordinate observer when external contours are built on the principle of subordinate regulation.