Development of active magnetic bearings for high speed rotors

Boehm, J.; Gerber, R.; Hartley, J.R.; Whitley, S.

doi:10.1109/20.104792

Cited by 19 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The functions and are quantities related to magnetic flux. They depend on the rotor displacements and coil currents in the following way: (2) where is the nominal air gap and is always positive in the operation range because that the rotor displacement is always smaller than the nominal air gap, i.e.,…”

Section: Nondimensional Modelmentioning

confidence: 99%

Nonlinear Smooth Feedback Control of a Three-Pole Active Magnetic Bearing System

Chen

2011

IEEE Trans. Contr. Syst. Technol.

View full text Add to dashboard Cite

In this study, a class of smooth feedback controllers is proposed for the stabilization of a three-pole active magnetic bearing (AMB) system. The three-pole AMB system is strongly nonlinear and nonaffine. Conventional controllers are nonsmooth and complicated, which is difficult for implementation and further study. The proposed smooth controllers are designed utilizing a linear transformation on the system inputs (coil currents). As a result, simple smooth controllers, such as quadratic state feedback controller, can be obtained. The domain of attraction of the origin under the smooth controller is estimated. The proposed smooth controller is verified through both numerical and experimental results.

show abstract

Section: Nondimensional Modelmentioning

confidence: 99%

Nonlinear Smooth Feedback Control of a Three-Pole Active Magnetic Bearing System

Chen

2011

IEEE Trans. Contr. Syst. Technol.

View full text Add to dashboard Cite

show abstract

“…In the medical sector, the bearingless motor has been successfully implemented for blood pumps [16], [17], which can be used either externally or, as so-called left ventricular assist devices, implanted into patients to support the heart function. Other possible applications in different industrial sectors (e.g., space, energy sector) include high-speed applications, energy storage in flywheels, and precise angular positioning [18]- [21]. In the majority of these applications, an interior rotor construction is used.…”

Section: Introductionmentioning

confidence: 99%

Bearingless 300-W PMSM for Bioreactor Mixing

Reichert

Nußbaumer²,

Kolar

2012

IEEE Trans. Ind. Electron.

109

View full text Add to dashboard Cite

This paper presents a novel exterior rotor topology of a bearingless brushless synchronous motor with rated power of 300 W. Owing to the large possible magnetic gap and the absence of mechanical bearings, this motor is especially qualified for high-purity and low-shear applications (e.g., bioreactor mixing). Both torque and magnetic bearing forces are created inside this disk-shaped motor using a sophisticated control (proportionalintegral-differential vector control) with superimposed drive and bearing currents fed to the concentrated combined stator coils. Optimal design is derived based on an electromagnetic analysis using the three-dimensional finite element method (3D-FEM), and the simulation results are verified with a prototype mixer setup.

show abstract

“…Unfortunately, the AMB is a highly complex nonlinear system and presents challenging difficulty from the standpoint of a closed-loop control design. To overcome this difficulty, many control methods have been applied to this system, such as linear control [1,2], PID control [3,4], sliding mode control [5], feedback linearization [6][7][8], and adaptive control [9]. However, many of the existing methods which deal with nonlinearity of the AMB usually require complicated algorithms or are effective only in the limited small neighborhood of the nominal equilibrium point, since they utilize linear control techniques by linearizing the dynamics of the AMB.…”

Section: Introductionmentioning

confidence: 99%

Robust H ∞ control for uncertain nonlinear active magnetic bearing systems via Takagi-Sugeno fuzzy models

Lee

Park

Joo

et al. 2010

Int. J. Control Autom. Syst.

View full text Add to dashboard Cite

In this paper, a systematic procedure to design the robust ∞ H fuzzy controller for a nonlinear active magnetic bearing (AMB) system affected by time-varying parametric uncertainties is presented. First, the continuous-time Takagi-Sugeno (T-S) fuzzy model is employed to represent the nonlinear AMB system. Next, based on the obtained fuzzy model, sufficient conditions are derived in terms of linear matrix inequalities (LMIs) for robust stability and ∞ H performance of the control system. The main feature of this paper is that some drawbacks existing in the previous approaches such as truncation errors and nonconvex bilinear matrix inequality (BMI) problem are eliminated by utilizing the homogeneous fuzzy model which includes no bias terms in the local state space models rather than the affine one which includes bias terms. Hence, the design method presented here will prove to be more tractable and accessible than the previous ones. Finally, numerical simulations demonstrate the effectiveness of the proposed approach.

show abstract

Development of active magnetic bearings for high speed rotors

Cited by 19 publications

References 5 publications

Nonlinear Smooth Feedback Control of a Three-Pole Active Magnetic Bearing System

Nonlinear Smooth Feedback Control of a Three-Pole Active Magnetic Bearing System

Bearingless 300-W PMSM for Bioreactor Mixing

Robust H ∞ control for uncertain nonlinear active magnetic bearing systems via Takagi-Sugeno fuzzy models

Contact Info

Product

Resources

About