Analysis of Voltage Restrictions for Induction Motor with an Improved Energy-Efficient Control Algorithm

Abstract

Most energy-efficient control algorithms impair the dynamics of the control system (CS). The most popular of these algorithms is the maximum torque per ampere (MPTA). The low power consumption of the electric drive is achieved by reducing the rotor flux linkage level. Improved algorithms help improve the dynamic performance of control systems without making them less efficient. The three considered possible approaches to ensuring the advanced dynamics of the control system are to sustain the current along the q axis, sustain the motor shaft torque value, and transform the torque command from a steplike function to a sloping straight. The procedure of estimating allowable stator currents with voltage constraints is presented, as well as its possible implementation in an improved energy-efficient control algorithm. The results allow using the suggested algorithm in the induction motor CS in systems with raised requirements on dynamics.