Feedforward decoupling control for rigid rotor system of active magnetically suspended high‐speed motors

Zhao, Haoyu; Zhu, Changsheng

doi:10.1049/iet-epa.2018.5824

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…(5) The hysteresis and eddy of magnetic materials are ignored. (6) The supporting surface is assumed to be a rigid body. (7) The gravity of the rotor is ignored.…”

Section: Dynamic Equation Of the Multi-dof Supporting Systemmentioning

confidence: 99%

“…The literature [6] proposed a feedforward decoupling control strategy of radial four degrees of freedom for the rigid rotor system of the electromagnetic bearing. The simulation and experimental results showed that the proposed feedforward decoupling controller can decouple the original radial coupling of the rigid rotor system of the electromagnetic bearing from a four-DOF system to a four single-DOF system.…”

Section: Introductionmentioning

confidence: 99%

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Decoupling Control of Multi-DOF Supporting System of MLDSB

et al. 2021

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Magnetic liquid double suspension bearing (MLDSB) is composed of an electromagnetic system and hydrostatic system and its bearing capacity and stiffness can be greatly improved. It is very suitable for occasions of medium speed, heavy load, and starting frequently. Due to the gyroscopic effect and interference between the supporting system, the space state of the rotor can be affected and the operation stability of the MLDSB can be reduced greatly. Therefore, the coupling features of the multi-degree of freedom (multi-DOF) system are analyzed and a decoupling controller is designed and verified in the paper. Firstly, the paper introduces the structural characteristics, stress forms, and control regulation mechanism. Then, the mathematical transfer function of the multi-DOF supporting system is established and the coupling principle is revealed. The state feedback decoupling controller is designed by means of a state feedback decoupling, and its decoupling effect is analyzed by the Simulink module. Finally, the single-DOF decoupling system is independently controlled by the use of the root locus method. The coupling characteristics between channel x and channel y are tested experimentally, and the decoupling controller is added and its effect tested. The results show that the state feedback decoupling controller can effectively reduce the coupling degree in the multi-DOF system and convert the multi-DOF coupling problem into a single-DOF independent control problem. The coupling effect of channel x and channel y is reduced by using the decoupling controller, with the subsequent displacement characteristic of the rotor increased, and then the operation stability of the MLDSB is improved greatly. This paper can enrich the support system of the MLDSB and provide a theoretical reference for stability control.

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“…(5) The hysteresis and eddy of magnetic materials are ignored. (6) The supporting surface is assumed to be a rigid body. (7) The gravity of the rotor is ignored.…”

Section: Dynamic Equation Of the Multi-dof Supporting Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decoupling Control of Multi-DOF Supporting System of MLDSB

et al. 2021

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“…Therefore, to realize high-precision control at higher speeds, more sophisticated control strategies must be developed. Zhao [5] used the feedforward decoupling method and a time-optimal tracking differentiator to realize decoupling of the rotor system at the cost of a minimum calculation amount, but this method will cause the decoupling subsystem to be not entirely symmetrical, and this is not conducive to controller design for high-precision control. Chen [6] used a combined strategy involving the feedback decoupling method and a 2-DOF PID controller to realize radial displacement control in the higher speed range.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimal Design of μ–Controller for Active Magnetic Bearing in High-Speed Motor

Zhu

2023

Actuators

Self Cite

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In this paper, a control strategy based on the inverse system decoupling method and μ-synthesis is proposed to control vibration in a rigid rotor system with active magnetic bearings that are built into high-speed motors. First, the decoupling method is used to decouple the four-degrees-of-freedom state equation of the electromagnetic bearing rigid rotor system; the strongly coupled and nonlinear rotor system is thus decoupled into four independent subsystems, and the eigenvalues of the subsystems are then configured. The uncertain parametric perturbation method is used to model the subsystem, and the multi-objective ant colony algorithm is then used to optimize the sensitivity function and the pole positions to obtain the optimal μ-controller. The closed-loop system thus has the fastest possible response, the strongest internal stability, and the best disturbance rejection capability. Then, the unbalanced force compensation algorithm is used to compensate for the high-frequency eccentric vibration; this algorithm can attenuate the unbalanced eccentric vibration of the rotor to the greatest extent and improve the robust stability of the rotor system. Finally, simulations and experiments show that the proposed control strategy can allow the rotor to be suspended stably and suppress its low-frequency and high-frequency vibrations effectively, providing excellent internal and external stability.

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“…As a typical mechatronics product, active magnetic bearing (AMB) finds various applications in rotating machinery recently 5 . Besides supporting the shaft with no lubrication and no mechanical wear, it was applied with both the feedback 6,7 and feedforward 8,9 controller design for active vibration suppression.…”

Section: Introductionmentioning

confidence: 99%

Active fast vibration control of rotating machinery via a novel electromagnetic actuator

Shao

Wang

et al. 2021

Struct Control Health Monit

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Summary This paper presents an active fast vibration control (AFVC) strategy applicable to rotating machinery. The actuator utilized is a novel active magnetic bearing that could achieve the integration with a hole‐pattern seal. The control algorithm leading to an electromagnetic force with an optimal combination of phase and magnitude under a certain speed is based on the principle of feedforward compensation and self‐optimization. The AFVC algorithm is implemented in a real compressor rotor system model and experimentally demonstrated on two test rigs of different scales. There is at least a 70% reduction in vibrations within 1 s over the case with no control. Excellent vibration control effects can be maintained even when the rotating speed is fluctuating. Furthermore, the proposed method could be free from elaborate system modeling and vibration phase extraction in practice, dramatically simplifying the control system design.

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Feedforward decoupling control for rigid rotor system of active magnetically suspended high‐speed motors

Cited by 4 publications

References 22 publications

Decoupling Control of Multi-DOF Supporting System of MLDSB

Decoupling Control of Multi-DOF Supporting System of MLDSB

Multi-Objective Optimal Design of μ–Controller for Active Magnetic Bearing in High-Speed Motor

Active fast vibration control of rotating machinery via a novel electromagnetic actuator

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