Design and Simulation of a Five Degrees of Freedom Active Control Magnetic Levitated Motor

Tezuka, Takayuki; Kurita, Nobuyuki; Ishikawa, Takeo

doi:10.1109/tmag.2013.2242452

Cited by 33 publications

(17 citation statements)

References 7 publications

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“…AMBs can be utilized in many industrial applications where fast and precise operations are desired, such as linear induction motors, turbo-molecular vacuum pumps, artificial hearts, and gas-turbine engines [2]- [4]. In [5], a novel motor with a magnetically levitated rotor is designed, and its dynamic characteristics are simulated. The proposed motor is shown to have successfully achieved five degreesof-freedom active control.…”

Section: Introductionmentioning

confidence: 99%

System Identification and Robust Control of Multi-Input Multi-Output Active Magnetic Bearing Systems

Noshadi

Shi

Lee

et al. 2016

IEEE Trans. Contr. Syst. Technol.

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Abstract-This paper studies the system identification and robust control of a multi-input multi-output (MIMO) active magnetic bearing (AMB) system. The AMB system under study is open-loop unstable, and the presence of right-half plane zeros and the rotor flexible modes bring additional degrees of difficulty to the control design of such a system. Firstly, a closed-loop system identification is performed by using frequency-domain response data of the system. Genetic Algorithm-based Weighted Least Squares method is employed to obtain the best frequencyweighted model of the system. As the cross-coupling channels have negligible gains in the low-frequency region, it is assumed that the system can be diagonalized. This allows the analysis of the system as a family of low-order single-input single-output (SISO) subsystems. On the other hand, the effects caused by the coupling channels become more significant at higher frequencies. Therefore, a similar method is used to obtain a high-order MIMO model of the system by including the cross-coupling effects. Next, SISO H∞ controllers and lead-lag type compensators are designed on the basis of the SISO models of the systems. To strive for a better performance, MIMO H2 and H∞ optimal controllers are synthesized on the basis of the MIMO model of the system. Extensive experimental studies are conducted on the performance of the designed SISO and MIMO controllers in real-time by taking into consideration both constant disturbances while the rotor is stationary, as well as sinusoidal disturbances caused by the centrifugal forces and the rotor mass-imbalance while the rotor is in rotation. Unlike the recently published works, it is shown that the accurate modeling of the system being controlled is the key to successful design of high-performance stable controllers that not only guarantee the internal stability of the system-controller interconnection, but also no further modifications are required before the real-time implementation of the designed controllers.

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Section: Introductionmentioning

confidence: 99%

System Identification and Robust Control of Multi-Input Multi-Output Active Magnetic Bearing Systems

Noshadi

Shi

Lee

et al. 2016

IEEE Trans. Contr. Syst. Technol.

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“…agnetic bearings have been widely used in flywheels [1] [2], control momentum gyro [3], actuators of space craft [4], artificial hearts [5] and high-speed machines [6] [7] because they have advantages such as no friction, no lubrication, and potential micro vibration.…”

Section: Introductionmentioning

confidence: 99%

Designing and Experimental Verification of the Axial Hybrid Magnetic Bearing to Stabilization of a Magnetically Suspended Inertially Stabilized Platform

Sun

Wang

2016

IEEE/ASME Trans. Mechatron.

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To decrease the mass and power loss of axial hybrid magnetic bearings (HMBs) in the application of inertially stabilized platform (ISP) with a large axial diameter, this paper investigates the effects of the layout of axial HMBs and the degree of asymmetry (DOA). An asymmetry axial HMB is proposed for ISP based on DOA. Each single axial HMB is modeled and analyzed using the reluctance network method. And the relationship between current and force, as well as the displacement and force, are studied. Additionally, the optimization design method of the axial HMB is presented based on DOA. According to the principle of the design, the layout of the complete asymmetry axial HMB is designed with eight single axial HMBs in the upper end and four single axial HMBs in the lower end of ISP. Furthermore, the relationship among displacement, current and displacement stiffness and the relationship among displacement, current and current stiffness are analyzed as the DOA varies. A prototype is manufactured based on the above design and analysis, and experiments are carried out. Experimental results illustrate that the mass and power loss will be decreased dramatically compared to the symmetry layout of axial HMBs.Index Terms-Axial hybrid magnetic bearing, reluctance network method, inertially stabilized platform, degree of asymmetry.

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“…AMBs have numerous advantages over their mechanical and hydro-static counterparts. The absence of mechanical contacts allows efficient operation of AMBs for extremely high-speed applications [1][2][3][4]. AMBs can be utilized in several industrial applications where precise operations are desired such as energy storage flywheels, artificial hearts, turbo-molecular vacuum pumps, and jet engines [5,6].…”

Section: Introductionmentioning

confidence: 99%

Optimal PID-type fuzzy logic controller for a multi-input multi-output active magnetic bearing system

Noshadi

Shi

Lee

et al. 2015

Neural Comput & Applic

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The performance of the fuzzy controllers depends highly on the proper selection of some design parameters which is usually tuned iteratively via a trial and error process based primarily on engineering intuition. With the recent developments in the area of global optimization, it has been made possible to obtain the optimal values of the design parameters systematically. Nevertheless, it is well known that unless a priori knowledge is available about the optimization search-domain, most of the available time-domain objective functions may result in undesirable solutions. It is consequently important to provide guidelines on how these parameters affect the closedloop behavior. As a result, some alternative objective functions are presented for the time-domain optimization of the fuzzy controllers, and the design parameters of a PID-type fuzzy controller are tuned by using the proposed time-domain objective functions. Finally, the real-time application of the optimal PID-type fuzzy controller is investigated on the robust stabilization of a laboratory active magnetic bearing system. The experimental results show that the designed PID-type fuzzy controllers provide much superior performances than the linear on-board controllers while retaining lower profiles of control signals.

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Design and Simulation of a Five Degrees of Freedom Active Control Magnetic Levitated Motor

Cited by 33 publications

References 7 publications

System Identification and Robust Control of Multi-Input Multi-Output Active Magnetic Bearing Systems

System Identification and Robust Control of Multi-Input Multi-Output Active Magnetic Bearing Systems

Designing and Experimental Verification of the Axial Hybrid Magnetic Bearing to Stabilization of a Magnetically Suspended Inertially Stabilized Platform

Optimal PID-type fuzzy logic controller for a multi-input multi-output active magnetic bearing system

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