scholarly journals Force Analysis of Single Axis Actuator Used in Active Magnetic Bearing (AMB)

2019 ◽  
Vol 9 (2) ◽  
pp. 2870-2874
Keyword(s):  
Three Dimensional ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Specific Structure ◽  
Attractive Force ◽  
Force Analysis ◽  
Single Coil ◽  
Amb System ◽  
Bearing System

This paper presented the force analysis of single coil actuator for Active Magnetic Bearing (AMB) system. Actuator is the most important segment of AMB system. In the bearing system rotor should be levitate before rotation. For the levitation required force is generated by actuator. For the specific structure attractive force is different. These force analysis is done in this manuscript. Depending upon the force appropriate structure can be used for design a perfect AMB system. Here force analysis is performed in ANSYS Maxwell software and characteristics graphs are presented in 2D and three dimensional plots are constructed using MATLAB for the better observation.

scholarly journals Fem Software Based 2-D and 3-D Construction and Simulation of Single and Double Coils Active Magnetic Bearing

2019 ◽  
Vol 8 (11) ◽  
pp. 665-675
Keyword(s):  
Magnetic Field ◽  
Three Dimensional ◽  
Magnetic Bearing ◽  
Simulation Software ◽  
Active Magnetic Bearing ◽  
Two Dimensional ◽  
Active Magnetic Bearings ◽  
Single Coil ◽  
Distinctive Structure ◽  
Amb System

This elaboration offers a dynamic model of an Active Magnetic Bearing (AMB) simulated in ANSYS Maxwell 17.1. This work reports simulation for two distinctive structure of AMBs that utilizations single electromagnets and double attraction type electromagnets put in 180 degrees separated from each other. At first, the theoretical model of single coil AMB and double coils AMB has been presented. It also deals with a simulation study of active magnetic bearings utilizing Finite Element Method (FEM) in two-dimensional (2-D) and three-dimensional (3-D) platform. 2-D and 3-D simulation have been compared for single and double coils AMB system. Magnetic properties such as- force, magnetic, flux pattern and flux density are performed and observed utilizing ANSYS Maxwell simulation software. This paper also includes a comparative study of an AMBs system with the variation in the gap between the actuator and the rotor and the effect of variation in inductance, flux, magnetic field and force are detected which is obligatory for hardware execution of an AMB system

An anti-windup control strategy to actuator saturating input voltage for active magnetic bearing system

2016 ◽  
Vol 35 (3) ◽  
Author(s):  
Avadh Pati ◽  
Richa Negi
Keyword(s):  
Control Strategy ◽  
Pid Control ◽  
Input Voltage ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Region Of Attraction ◽  
Control Scheme ◽  
Amb System ◽  
Voltage Saturation ◽  
Bearing System

Purpose The active magnetic bearing is highly nonlinear and unstable system. In general most of physical systems, conventional PID control strategies are employed for their stable operation but the dynamics of the system are influenced by input voltage saturation that degrades the performance of the system. The conventional PID control scheme does not work properly alone. In such a situation, PID faces windup phenomenon that leads to instability in the system. To overcome this problem, an anti-windup control scheme leads to stable and smooth operation of active magnetic bearing system. Design/methodology/approach The proposed anti-windup control strategy is based on dynamic output feedback that is applied on linearized active magnetic bearing (AMB) system to stabilize and avoid the input voltage saturation effect in the actuator. Findings An anti-windup controller is designed for active magnetic bearing system in presence of input voltage saturation. The stability of AMB system with anti-windup controller is derived in sense of Lyapunov and expressed as linear matrix inequality problem for AMB system and the designed anti-windup controller also enlarges the region of attraction of considered AMB system. Originality/value T-S fuzzy technique is used for obtaining local linear model of nonlinear active magnetic bearing system for easy and simple implementation of anti-windup control scheme. In proposed methodology the region of attraction for anti-windup compensator is also discussed. The effectiveness of proposed method is verified by the numerical simulation results for considered active magnetic bearing system and domain of attraction or stability region of closed loop AMB system are also calculated using Eigen Value Optimization technique for both the cases such as with and without anti-windup controller. The comparative result and the contribution of proposed control strategy are also discussed.

Nonlinear Vibration of a Rotor-Active Magnetic Bearing System With 16-Pole Legs

2017 ◽  
Author(s):  
Ruiqin Wu ◽  
Wei Zhang ◽  
Ming Hui Yao
Keyword(s):  
Parametric Excitation ◽  
Multiple Scales ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Dynamical Response ◽  
Time Varying ◽  
Chaotic Motions ◽  
Dimensionless Equation ◽  
Amb System ◽  
Bearing System

In this paper, the nonlinear dynamics of a rotor-active magnetic bearing system with 16-pole legs and the time varying stiffness is investigated. The magnetic forces are obtained through an electromagnetic theory. The motion governing equation is derived by using Newton law. The resulting dimensionless equation of motion for the rotor-AMB system with 16-pole legs and the time varying stiffness is presented with the two-degree-of-freedom system including parametric excitation, the quadratic and cubic nonlinearities. The averaged equations of the rotor-AMB system are obtained by using the method of multiple scales under the case of the primary parametric resonance and 1/2 sub-harmonic resonance. The numerical results show that there exist the periodic, quasi-periodic and chaotic motions in the rotor-active magnetic bearing system. Since the weight of the rotor effect the system, it is also found that there are the different shapes of motion on the two directions of the rotor-AMB system. The parametric excitation, or the time-varying stiffness produced by the PD controller has great impact on the system. Thus, the complicated dynamical response in the rotor-AMB system can be controlled through adjusting the parametric excitation.

scholarly journals Optimal Design of Tolerance Ring in Double-Decker Catcher Bearing System

2015 ◽  
Vol 9 (1) ◽  
pp. 618-623 ◽  
Author(s):  
Zhu Yili ◽  
Zhang Yongchun
Keyword(s):  
Optimal Design ◽  
Theoretical Analysis ◽  
Numerical Simulations ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Design Parameters ◽  
Impact Forces ◽  
Double Decker ◽  
Amb System ◽  
Bearing System

In an active magnetic bearing (AMB) system, the catcher bearings (CBs) are essential to protect the system in cases of AMB failure. On the basis of the former researches of double-decker catcher bearings (DDCBs), a tolerance ring is proposed to further improve the performance of DDCB. Firstly, the support model of DDCB supported by tolerance ring is established. Then numerical simulations are carried out to determine the design parameters of tolerance ring. Finally, the tolerance ring is manufactured according to the obtained parameters and relative experiments are carried out to verify the theoretical analysis results. Both theoretical and experimental results validated that proper tolerance ring is beneficial to reduce the following impact forces and vibrations after rotor drop.

Development of Exclusive Controller and HILS for Active Magnetic Bearing System

2012 ◽  
Vol 241-244 ◽  
pp. 1365-1369
Author(s):  
Seok Jo Go ◽  
Chi Yen Kim ◽  
Min Kyu Park ◽  
Young Jin Lee ◽  
Bin Yao
Keyword(s):  
High Speed ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
System Response ◽  
Current Output ◽  
Linear Current ◽  
Amb System ◽  
Fast Control ◽  
And Control ◽  
Bearing System

The active magnetic bearing system has been studied for long period. Comparing with long research history, the AMB application into industrial field is shown slowly for various causes. One of primary factor is to make up exclusive controller which can generate fast linear current output. Thus, this paper developed the exclusive AMB controller mounted high speed DSP which can operate so fast control calculation that improve system response ability. Especially, to consider the fusion of AMB system and control software, the development is conducted in HILS system with dSPACE from the beginning. Although HILS system is adopted, the developed ABM controller simplified the whole system and could make up optimized control algorithm promptly by measuring and applying the system gain and characteristics of them monitored by the HILS system in real time.

Some Nonlinear Effects of Magnetic Bearings

1999 ◽  
Author(s):  
Norbert Steinschaden ◽  
Helmut Springer
Keyword(s):  
Equations Of Motion ◽  
Period Doubling ◽  
Path Following ◽  
Nonlinear Effects ◽  
Magnetic Bearing ◽  
Operating Conditions ◽  
Active Magnetic Bearing ◽  
Nonlinear Phenomena ◽  
Amb System ◽  
Large Rotor

Abstract In order to get a better understanding of the dynamics of active magnetic bearing (AMB) systems under extreme operating conditions a simple, nonlinear model for a radial AMB system is investigated. Instead of the common way of linearizing the magnetic forces at the center position of the rotor with respect to rotor displacement and coil current, the fully nonlinear force to displacement and the force to current characteristics are used. The AMB system is excited by unbalance forces of the rotor. Especially for the case of large rotor eccentricities, causing large rotor displacements, the behaviour of the system is discussed. A path-following analysis of the equations of motion shows that for some combinations of parameters well-known nonlinear phenomena may occur, as, for example, symmetry breaking, period doubling and even regions of global instability can be observed.

Force Analysis of a Slotless Lorentz-Type Active Magnetic Bearing Actuator

2018 ◽  
Author(s):  
Guzman Borque Gallego ◽  
Leopoldo Rossini ◽  
Timon Achtnich ◽  
Christof Zwyssig ◽  
Douglas Martins Araujo ◽  
...  
Keyword(s):  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Force Analysis

Dynamic Modeling and Analysis of Active Magnetic Bearings

2014 ◽  
Vol 494-495 ◽  
pp. 685-688
Author(s):  
Rong Gao ◽  
Gang Luo ◽  
Cong Xun Yan
Keyword(s):  
Dynamic Characteristic ◽  
Dynamic Modeling ◽  
Magnetic Bearing ◽  
Integrated System ◽  
Magnetic Bearings ◽  
Active Magnetic Bearing ◽  
Active Magnetic Bearings ◽  
Modeling And Analysis ◽  
Amb System ◽  
Mathematics Method

Active magnetic bearing (AMB) system is a complex integrated system including mechanics, electronic and magnetism. In order to research for the basic dynamic characteristic of rotor supported by AMB, it is necessary to present mathematics method. The dynamics formula of AMB is established using theory means of dynamics of rotator and mechanics of vibrations. At the same tine, the running stability of rotor is analyzed and the example is presented in detail.

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