Stator flux orientation inverse system decoupling control strategy of bearingless induction motor considering stator current dynamics

Abstract

The bearingless induction motor (BLIM), is a multi‐variable, nonlinear, and strongly coupled system. In order to improve its dynamic control performance, considering the stator current dynamics, a stator flux orientation (SFO) inverse system decoupling control strategy is proposed in this paper. Taking the dynamic characteristics of the torque winding current into account, the state equation of the BLIM system based on SFO is established. Then, on the basis of invertibility analysis, the inverse system dynamic mathematical model of the BLIM system is derived, the inverse system dynamic decoupling control strategy is presented, and the comprehensive design of the closed loop for each decoupled linear subsystem is carried out. Simulation experimental results show that the BLIM control system has excellent dynamic and static decoupling control performance, the influence of rotor parameters can be effectively overcome, and the ability to resist the load torque disturbance can be obviously improved. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.