Variable Bias Current in Magnetic Bearings for Energy Optimization

Şahinkaya, M. Necip; Hartavi, Ahu Ece

doi:10.1109/tmag.2006.888731

Cited by 57 publications

(30 citation statements)

References 13 publications

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“…Some discussion on the voltage saturation in a reduced-bias flux-feedback control based on state feedback and observer designs was given in [12]. The effect of the variable bias current on the adaptive AMB control system, with respect to the energy savings and performance, was studied in [13].…”

Section: Introductionmentioning

confidence: 99%

Cascaded Position-Flux Controller for an AMB System Operating at Zero Bias

et al. 2014

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The paper reports on the implementation and the design of a controller for a fuel cell blower (FCB) with active magnetic bearings (AMBs). The cascaded position-fluxcentralized controller is comprised of a centralized position control loop and an inner flux control loop. The last one is based on state estimation without explicit flux measurements. As the position control is not dependent on the magnetic field nonlinearities, such a control structure enables operation under a zero bias. The practical working implementation of a flux control for the industrial levitated rotor is shown for the first time. The flux control gives better results than current control for both normal and zero bias operation. The system is analyzed fully, combining rotor dynamics and power amplifier analyses simultaneously. The importance of using the coil voltage in addition to current and practical treatment of the flux control is revealed. The centralized position-flux controller is compared with a state-of-the-art cascaded position-current control, which has inner current control loops. The proposed control solution with a zero bias can achieve a dynamic performance comparable that of a controller with the classical bias current.

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Section: Introductionmentioning

confidence: 99%

Cascaded Position-Flux Controller for an AMB System Operating at Zero Bias

et al. 2014

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“…Sahinkaya 와 Hartavi (7) 는 적응제어기법을 통해 부 하조건에 따라 바이어스 전류를 조절하는 방법을 제안하였으나, 적응제어기의 안정성이 검증되지 않았다. Sivrioglu 등 본 연구에서는 능동 자기베어링에 가장 흔히 사 용되는 비례-미분(proportional-derivative, PD)제어기 와 불평형 질량에 의한 영향을 최소화하는 동기 노치필터(synchronous notch filter) (10) 를 결합하여 기 준제어기를 설계하고, Sivrioglu 의 스위칭 제어기 …”

Section: 서 론unclassified

Comparative Study of Performance of Switching Control and Synchronous Notch Filter Control for Active Magnetic Bearings

Yoo¹,

Noh

2013

Transactions of the Korean Society of Mechanical Engineers A

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“…Let the generalized control flux be defined as (5) and consider the voltage switching strategy when when (6) where is the generalized control voltage. Then, from (1), (2), (3), (4), (5), and (6), the AMB model has the equivalent form (7) where .…”

Section: Amb Modelmentioning

confidence: 99%

“…On the other hand, in order to reduce electromagnetic losses in an AMB system due to eddy current or ohmic effects, it is desirable to reduce or eliminate the bias current during AMB operation, which, however, enhances the AMB-system nonlinearities and may lead to a control saturation or singularity. Due to these conflicting objectives, the design of stabilizing control laws for low-loss AMBs subject to saturation constraints is, thus, a challenging problem [1]- [5]. In this paper, we consider the control of AMBs operating in the switching mode with the constraint on the control-voltage amplitude.…”

Section: Introductionmentioning

confidence: 99%

Robust Fuzzy Control of an Active Magnetic Bearing Subject to Voltage Saturation

Zhang

et al. 2010

IEEE Trans. Contr. Syst. Technol.

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, "Robust fuzzy control of an active magnetic bearing subject to voltage saturation," IEEE transactions on control systems technology : a publication of the IEEE Control Systems Technology, 18 (1), pp. 164-169, 2010. Robust fuzzy control of an active magnetic bearing subject to voltage saturation AbstractBased on a recently proposed model for the active-magnetic-bearing (AMB) switching mode of operation, this paper presents a robust Takagi-Sugeno-model-based fuzzy-control strategy to stabilize the AMB with fast response speed subject to control-voltage saturation and parameter uncertainties. The sufficient conditions for the existence of such a controller are derived in terms of linear matrix inequalities. Numerical simulations against the proposed AMB model and a high-fidelity AMB model are used to validate the effectiveness of the proposed approach.

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Variable Bias Current in Magnetic Bearings for Energy Optimization

Cited by 57 publications

References 13 publications

Cascaded Position-Flux Controller for an AMB System Operating at Zero Bias

Cascaded Position-Flux Controller for an AMB System Operating at Zero Bias

Comparative Study of Performance of Switching Control and Synchronous Notch Filter Control for Active Magnetic Bearings

Robust Fuzzy Control of an Active Magnetic Bearing Subject to Voltage Saturation

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