Limiting electromagnetic torque fluctuations of an induction motor with scalar control

The paper presents mathematical models of induction motor as a system of equations and a structure. It also suggests the correction methods of induction motor with scalar control, which decrease fluctuations of electromagnetic torque. The graphs of the transients of the frequency-controlled electric drive with scalar control, obtained based on the mathematical model with and without additional correction device, are given. The presented scalar control system for induction motor allows starting the electric drive and regulating the speed with the stabilization of the electromagnetic torque of induction motor with a maximum deviation from the mean value under 5 %, as well as suppressing the engine speed fluctuations in transient modes. The frequency-controlled electric drives with induction motor and scalar control with improved dynamic properties can be applied in metallurgical mechanisms.