Sliding mode variable structure control strategy of bearingless induction motor based on inverse system decoupling

2018 ◽  
Vol 13 (7) ◽  
pp. 1052-1059 ◽  
Author(s):  
Wenshao Bu ◽  
Xiaofeng Zhang ◽  
Fangzhou He
Keyword(s):  
Induction Motor ◽  
Control Strategy ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Inverse System ◽  
Structure Control ◽  
Sliding Mode Variable Structure

scholarly journals Position Control Study on Pump-Controlled Servomotor for Steam Control Valve

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 221
Author(s):  
Guishan Yan ◽  
Zhenlin Jin ◽  
Tiangui Zhang ◽  
Penghui Zhao
Keyword(s):  
Control Strategy ◽  
Position Control ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Control Valve ◽  
Good Control ◽  
Variable Structure ◽  
Structure Control ◽  
Sliding Mode Variable Structure ◽  
Valve Control

In steam turbine control and actuation, the steam control valve plays a key role in operability and reliability. The electrohydraulic regulating system for the steam control valve, usually called the servomotor, needs to be reliable and high performing under nonlinear excitation interference in actual conditions. Currently, electrohydraulic servo valve control technology is widely used in servomotors. Although this technology has good control performance, it still has some technical defects, such as poor antipollution ability, low energy efficiency, large volume size, and limited installation space. Aiming at the abovementioned technical shortcomings of electrohydraulic servo valve control technology, a servomotor-pump-hydraulic cylinder volume control scheme is proposed in this paper, forming a pump-controlled servomotor for the steam control valve. By analyzing the working principle of the pump-controlled servomotor position control in the steam control valve, the mathematical model of a pump-controlled servomotor for the steam control valve is established. The sliding mode variable structure control strategy is proposed, and the variable structure control law is solved by constructing a switching function. To verify the performance of the proposed control method, experimental research was conducted. The research results show that the proposed sliding mode variable structure control strategy has a good control effect, which lays the theoretical and technical foundation for the engineering application and promotion of pump-controlled servomotors for steam control valves and helps the technical upgrade and product optimization of steam turbines.

Based on Sliding Mode Variable Structure Current Controller for Induction Motor Vector Control Technology

2013 ◽  
Vol 711 ◽  
pp. 426-431
Author(s):  
Chun Yan Cui ◽  
Kui Li ◽  
Bing Li ◽  
Chao Fu ◽  
Jia Guo
Keyword(s):  
Vector Control ◽  
Induction Motor ◽  
Control Algorithm ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Model Parameters ◽  
Structure Control ◽  
Current Controller ◽  
Sliding Mode Variable Structure

In this paper, according to the induction motor in rotating coordinate system mathematical model, established based on rotor flux oriented vector control model and realized flux linkage and torque decoupling. In order to solve the current high coupling, designed the sliding mode variable structure control algorithm of current controller. Based on the sliding mode variable structure control algorithm achievable conditions and Lyapunov stability theorem, proved that the sliding mode of accessibility and stability, determined the sliding model parameters. The simulation results show that the sliding mode variable structure control of induction motor vector control system, can reduce the torque ripple and the speed overshoot and improve the system parameter perturbation and external disturbance signal robustness.

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