Adaptive Synchronization Control Design for High-Speed Magnetic Bearings

1995 ◽  
Author(s):  
Li-Farn Yang ◽  
Jeen-Gwo Tsao
Keyword(s):  
Disturbance Rejection ◽  
High Speed ◽  
Feedforward Control ◽  
Rotating Disk ◽  
Rotor System ◽  
Magnetic Bearings ◽  
Adaptive Synchronization ◽  
Synchronization Control ◽  
Plant Variation ◽  
Adaptive Feedforward

Abstract The performance of actively controlled magnetic bearings is greatly degraded if subjected to unpredictable disturbances or system dynamic variations. This paper present an adaptive synchronization control on a magnetically suspended rotor system for disturbance rejection and plant variation compensation. The rotor system consists of a rotating disk mounted on a shaft which is actively positioned in the radial directions via two magnetic bearings at both ends. Under the synchronizing control, four displacements of shaft along bearing axes are coordinated such that the disturbed displacement can promptly be recovered with those undisturbed in a complementary way. Such motion synchronization requires strict regulation and adaptation through four local controllers with an adaptive feedforward control scheme. The local controllers can be linked by the coupling law, in which an error along one bearing axis can affect overall control loop of four axes. Two control algorithms are developed under the biaxial and quadaxial synchronization conditions, and their adaptation laws are optimized in an attempt to minimize the adaptation errors. Simulations of disturbance rejection responses will also be presented.

Imbalance Detection and Health Monitoring From Gain Variations in an Adaptive Disturbance Rejection Controller

2007 ◽  
Author(s):  
Kelly Barber ◽  
George T. Flowers ◽  
Alex Matras ◽  
Mark Balas ◽  
Jerry Fausz
Keyword(s):  
Health Monitoring ◽  
Disturbance Rejection ◽  
High Speed ◽  
Crack Detection ◽  
Adaptive Strategy ◽  
Magnetic Bearings ◽  
Test Rig ◽  
Rotor Systems ◽  
Common Technique ◽  
Insight Into

Health monitoring is of critical importance in maintaining the integrity of high-speed rotating machinery. In this paper, a health monitoring strategy based upon the acquisition and analysis of vibration measurements is described and evaluated. A common technique in this regard is to track changes in the synchronous vibration due to imbalance. However, such an approach must consider the controller strategy used with the magnetic bearings. Herein, a simulation model is developed that consists of a flywheel system supported by magnetic bearings, which are controlled using an adaptive strategy that suppresses synchronous vibration. The interaction between the rotor vibration and the controller responses are evaluated in order to provide insight into indicators of crack initiation and growth. The results and conclusions are also validated using an experimental test rig. Some insights and guidelines as to appropriate strategies for crack detection in rotor systems interacting with active bearing controllers is presented and discussed.

Synchronization of Two Motion Control Axes Under Adaptive Feedforward Control

1992 ◽  
Vol 114 (2) ◽  
pp. 196-203 ◽  
Author(s):  
Masayoshi Tomizuka ◽  
Jwu-Sheng Hu ◽  
Tsu-Chih Chiu ◽  
Takuya Kamano
Keyword(s):  
Motion Control ◽  
Time Domain ◽  
Adaptive Systems ◽  
Feedforward Control ◽  
Synchronization Error ◽  
Adaptive Synchronization ◽  
Motion Error ◽  
Feedforward Controller ◽  
The Difference ◽  
Adaptive Feedforward

In this paper, motion synchronization of two d-c motors, or motion control axes, under adaptive feedforward control is considered. The adaptive feedforward control system for each axis consists of a proportional feedback controller, an adaptive disturbance compensator and an adaptive feedforward controller. If the two adaptive systems are left uncoupled, a disturbance input applied to one of the two axes will cause a motion error in the disturbed axis only, and the error becomes the synchronization error. To achieve a better synchronization, a coupling controller, which responds to the synchronization error, i.e., the difference between the two motion errors, is introduced. In this case, when a disturbance input is applied to one axis, the motion errors appear in the undisturbed axis as well as in the disturbed axis. The motion error in the undisturbed axis is introduced by the coupling controller and the adaptive feedforward controller. The adaptive synchronization problem is formulated and analyzed in the continuous time domain first, and then in the discrete time domain. Stability conditions are obtained. Effectiveness of the adaptive synchronization controller is demonstrated by simulation.

Dynamic Performance of the Bearing-Rotor System in the Ultra-High Speed Electric Spindle with a Additional Supporting System Make up of the Permanent Magnetic Bearings

2011 ◽  
Vol 295-297 ◽  
pp. 2294-2299
Author(s):  
Song Sheng Li ◽  
Hua Wei Mao ◽  
Ping Chen ◽  
Xiao Huang ◽  
Peng Zhou ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnets ◽  
Dynamic Performance ◽  
Rotor System ◽  
Magnetic Bearings ◽  
Supporting System ◽  
Ultra High Speed ◽  
Novel Method ◽  
Additional Support

A novel method, aiming at solving the problem that the ultra-high-speed electric spindle tends to vibrate as its stiffness is small, using the repulsion of permanent magnets based on the theory that repulsion increased while the two magnets come close, is provided in this paper to design a electric spindle within additional support bearing system consist of two radial permanent magnet rings against each other. This paper also analyses the dynamic performance of radial permanent magnet bearings additional supporting system for ultra-high speed electric rotor system, result shows that the radial permanent magnetic bearings additional supporting system designed for improving the critical speed of the rotor system, reducing the rotor radial dynamic response, can effectively improve the dynamic performance and operational stability of ultra-high speed electric spindle rotor system.

scholarly journals Mathematical model of the hybrid system of magnetic levitation energy production equipment autonomous power 97 supply systems

2016 ◽  
Vol 2 (3) ◽  
pp. 97-108
Author(s):  
V E Vavilov
Keyword(s):  
Mathematical Model ◽  
High Speed ◽  
Mutual Influence ◽  
Magnetic Bearing ◽  
Production Equipment ◽  
Rotor System ◽  
Magnetic Suspension ◽  
Magnetic Bearings ◽  
Object Position ◽  
The Impact

Introduction. Typically, when developing mathematical models magnetocavitation systems (magnetic bearings, electrostatic bearings, hybrid magnetic bearings (GMP, etc.) is considered just the very bearing as a separate, isolated Electromechanical system. This approach allows us to accurately explore the process magnetocavitation systems, but practically does not allow to evaluate the processes occurring in the system of magnetic bearing-object position. To solve this problem, the author proposes a different approach to the analysis of the processes in magnetocavitation systems in General and GPC in particular considering the magnetic bearing-object position, as a single complex. Goal. The work aimed the creation of a generalized analytical model of high-speed, AMPE with coercivity permanent magnet (VPM) on an elastic bearing supports, taking into account the mutual influence of processes in AMPA and bearing supports. This task is new and relevant and is essential to modern engineering. To solve this problem this paper developed a generalized mathematical model of the rotor system on a hybrid magnetic suspension. Evaluate the impact of hybrid magnetic bearings on the overall behavior of the rotor system. Performed analysis of processes in Electromechanical energy converters and mechanical processes occurring in the rotary system. Method and methodology. The research methodology is based on the joint solution of Maxwell equations and equations describing the mechanical processes of a rotor system with five degrees of freedom. Conclusion. The generalized mathematical model of high-speed, AMPE with VPM on a non-contact bearing supports and conducted her research. Based on research of the developed mathematical model, the authors developed an original control algorithm for the rotor position in a hybrid magnetic bearings, which allows for the design of high-speed, AMPE with VPM to abandon the position sensors of the rotor. In addition, on the basis of the results of calculations, a method was developed for diagnostics of eccentricity of rotor are high-speed, AMPE with VPM, as well as new methods of calculation of high-speed, AMPE with VPM, past experimental verification.

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