Bearingless induction motor (BLIM), is a nonlinear, multivariable and strongly coupled object. In order to improve its dynamic decoupling control performance, and overcome the influences of the load disturbance and the motor parameter variation, under the conditions of considering the stator current dynamics of the torque system, the inverse system model of BLIM system is established firstly, and by the inverse system method, the BLIM system is decoupled into four second-order pseudo linear subsystems. And then, according to the sliding mode control (SMC) theory, the SMC regulator is designed for each subsystem, an exponential approach law is used to reduce the chattering of SMC system; the stability of SMC system is verified by the Lyapunov method. Simulation experimental results have shown that the inverse system decoupling SMC system not only has an excellent dynamic decoupling control performance, but also has a faster response speed and a stronger robustness.
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