Affiliations: Information Engineering College, Henan University of Science and Technology, Luoyang, Henan, China
Correspondence:
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Corresponding author: Wenshao Bu, Information Engineering College, Henan University of Science and Technology, Luoyang 471023, Henan, China. E-mail:wsbu@haust.edu.cn
Abstract: BLIM, i.e. bearingless induction motor, is a
multi-variable, nonlinear and strong coupling object. To achieve its dynamic
decoupling control with high performance, a novel dynamic decoupling control
strategy is proposed. After analyzing the working principle and mathematical
model of BLIM, the state equations based on stator flux orientation are
established firstly. On the basis of reversibility analysis of BLIM system,
the inverse system dynamic mathematical model based on stator flux
orientation is derived. And then, adopting inverse system method, the
control system of BLIM is uncoupled to four linear subsystems, including:
motor speed subsystem, stator flux-linkage subsystem, and two radial displacement
components subsystems. System simulation results have shown that reliable
dynamic decoupling control between relevant variables can be realized,
higher static and dynamic control performance can be achieved; in
particular, the influence of rotor parameters on the identification
precision of motor magnetic flux-linkage can be avoided effectively. The
proposed inverse system decoupling control strategy based on stator flux
orientation is effective and feasible; a new way has been provided for high
performance decoupling control of bearingless induction motor.
Keywords: Three-phase bearingless induction motor, stator flux orientation, model of inverse system, modeling and simulation, decoupling control strategy
