A Convenient Control Strategy of Bearingless Induction Motor Based on Inverse System Method

For the strong coupling problem of three-phase bearingless induction motor which is a multi- variable and nonlinear object, a kind of decoupling control strategy based on inverse system method is proposed. The reversibility of torque subsystem was analyzed based on rotor flux orientation, and the decoupling control strategy based on inverse system method was analyzed. Then the torque system was decoupled into two second-order linear subsystems, i.e. the rotor speed subsystems and the rotor flux subsystems. The suspension system adopts negative feedback control; the required air-gap flux linkage of torque system was obtained from the rotor flux and stator current. Finally, synthesis and simulation of the overall control system were researched. Simulation results demonstrate that good performance of decoupling control can be achieved. The presented control strategy is feasible and available.

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Inverse System Analysis and Modeling of Bearingless Induction Motor and Its Combined Control Strategy

Mathematical Problems in Engineering ◽

10.1155/2014/698171 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 4

Author(s):

Wen-shao Bu ◽

Cong-lin Zu ◽

Chun-xiao Lu

Keyword(s):

Induction Motor ◽

Strong Coupling ◽

Control Strategy ◽

Inverse System ◽

Decoupling Control ◽

Flux Linkage ◽

Inverse System Method ◽

Stator Current ◽

System Method ◽

Stator Flux

Bearingless induction motor is a multi-variable, nonlinear and strong coupling object, the existing inverse control method ignores the stator current dynamics of torque system. Aiming at its nonlinear and strong coupling problems, a novel combinatorial decoupling control strategy based on stator flux orientation and inverse system method is proposed. Taking the stator current dynamics of four-pole torque system into account, the reversibility and inverse system model of torque system are analyzed and established. Adopting the inverse system method, the dynamic decoupling between motor speed and stator flux-linkage is achieved; by online identification and calculation, the airgap flux-linkage of torque system is got. Based on above, feedback and compensation control of two radial displacement components of two-pole suspension system is realized. Simulation results have shown the higher decoupling control performance and stronger anti-interference ability of the decoupling control system; the proposed decoupling strategy not only owns the characteristics of be simple and convenient, but also is effective and feasible.

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Decoupling Control of the 5 Degree-of-Freedom Bearingless Induction Motor Based on ¿-th Order Inverse System Method

2007 Chinese Control Conference ◽

10.1109/chicc.2006.4346882 ◽

2006 ◽

Author(s):

Liu Xianxing ◽

Dong Lei ◽

Fan Wenjin ◽

Sun Yuxin

Keyword(s):

Induction Motor ◽

Inverse System ◽

Degree Of Freedom ◽

Decoupling Control ◽

Inverse System Method ◽

System Method

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Nonlinear Internal Model Control for Bearingless Induction Motor Based on Inverse System Theory

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1037.258 ◽

2014 ◽

Vol 1037 ◽

pp. 258-263

Author(s):

Zheng Qi Wang ◽

Xue Liang Huang

Keyword(s):

System Theory ◽

Induction Motor ◽

Internal Model ◽

Control Method ◽

Internal Model Control ◽

Inverse System ◽

Inverse System Method ◽

Coupling System ◽

System Method ◽

Model Control

The bearingless induction motor is a nonlinear, multi-variable and strongly coupling system. In this paper, a new nonlinear internal model control (IMC) strategy based on inverse system theory is proposed to realize the decoupling control for the bearingless induction motor. The mathematical model of the motor is built and then the inverse system method is applied to decouple the original nonlinear system. Finally the internal model control method is introduced to ensure the robustness of the closed-loop system. The effectiveness of the proposed strategy are demonstrated by simulation.

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