Abstract
An active magnetic bearing (AMB) is a kind of high-performance bearing that uses controllable electromagnetic force to levitate the rotor. Its control performance directly affects the operation characteristics of high-speed motors and other electromechanical products. The magnetic bearing control model is nonlinear and difficult to control. Sliding mode control algorithm can be used in the magnetic bearing control system, but the traditional sliding mode control has the problem of high-frequency chattering, which affects the operation stability of magnetic bearings. Based on the second-order sliding mode control algorithm, a new second-order sliding mode controller for active magnetic bearing control was designed, and the stability of the designed sliding mode control law was proven by Lyapunov criterion. On the basis of the established active magnetic bearing control model, the numerical analysis of the designed controller was carried out, and the control effect was compared with that obtained by the exponential reaching law for the sliding mode control algorithm. The experimental results show that the designed sliding mode controller has better dynamic performance and stability than the exponential reaching law for the sliding mode controller.
Highlights
An active magnetic bearing (AMB) is a kind of bearing structure that uses controllable electromagnetic force to make the rotor suspend stably
The traditional sliding mode control has the problem of high-frequency chattering near the stable point, which may excite the unmodeled high-frequency components in the system, reducing the stability of AMB
The control effects of the designed controller and sliding mode controller based on exponential reaching law were compared by simulation, and the experimental results were verified by the magnetic bearing control hardware experimental platform
Summary
An active magnetic bearing (AMB) is a kind of bearing structure that uses controllable electromagnetic force to make the rotor suspend stably It has the advantages of strong antidisturbance ability, fast dynamic response, adjustable bearing capacity, and small loss. The traditional sliding mode control has the problem of high-frequency chattering near the stable point, which may excite the unmodeled high-frequency components in the system, reducing the stability of AMB and weakening its ability to resist dynamic load disturbance [6,7]. In order to realize the stability control of AMB, which is a time-varying, complex, and nonlinear system, a magnetic bearing system control method based on PID surface sliding mode control was proposed in [8]. For the traditional sliding mode control algorithm applied to the control of a magnetic bearing system, there is a high-frequency chattering problem near the stable point. The control effects of the designed controller and sliding mode controller based on exponential reaching law were compared by simulation, and the experimental results were verified by the magnetic bearing control hardware experimental platform
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
