Assessment of dynamics of asynchronous drive by nonlinear transfer function. Correction of nonlinearity of asynchronous electric drive

Abstract

The article describes methods for analyzing dynamic processes in structures that form a mechanical moment in asynchronous electric motors with frequency control. For the first time, the nonlinearity of the mechanical characteristics of an asynchronous electric motor is taken into account in the transfer function of the torque former, which is expressed in dependence of this function on sliding (lag of the rotor speed of rotation of the speed of rotation of the stator magnetic field) and on the frequency of the voltage at the motor stator. It is shown how dynamic positive feedback on the stator current «linearizes» an asynchronous electric drive without violating the stability of transients. This work is an example of how the initial complicated (but more accurate!) Interpretation of nonlinearity made it possible to find a new better solution to the problem of controlling a complex dynamic object.

Keywords

• ac drive
• mathematical analysis
• dynamic nonlinearity
• frequency response
• dynamic correction
• positive feedback