Special Issue "Magnetic Bearing Actuators"

A special issue of Actuators (ISSN 2076-0825).

Deadline for manuscript submissions: closed (31 January 2019).

Special Issue Editor

Prof. Dr. Takeshi Mizuno
E-Mail Website
Guest Editor
Department of Mechanical Engineering, Saitama University, Shimo-Okubo 255, Skuara-ku, Saitama 338-8570, Japan
Interests: mechatronics; magnetic bearing; magnetic suspension; vibration control; force and mass measurement; micro assembly

Special Issue Information

Dear Colleagues,

Active magnetic bearings have several distinguishable advantages over other bearings—complete contact-free suspension of a rotating object, controllable and observable bearing force, lubrication-free and maintenance-free characteristics, etc. The range of applications steadily increases and novel systems are still being developed. This Special Issue is aimed at presenting this technology with a focus on the various aspects of actuators: Geometric design, choice of materials, modeling, analysis, measurement, control, and evaluation. Linear magnetic bearings for non-rotating objects are also targeted, even though “magnetic bearing” implies a rotating object.

Encouraged contributions related (but not limited) to novel configurations/functions, designs for special-condition operations, power amplifier and drive schemes, sensing/estimating techniques, sophisticated control schemes, coupled with motor drive, minimization of loss, and reduction of hardware, are welcome.

Prof. Takeshi Mizuno
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Actuators is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Active magnetic bearings
  • Design optimization
  • Power amplifier
  • Magnetic losses
  • Special-environement operations
  • Reduction of hardware and cost

Published Papers (7 papers)

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Research

Open AccessArticle
An Active Vehicle Suspension Control Approach with Electromagnetic and Hydraulic Actuators
Actuators 2019, 8(2), 35; https://doi.org/10.3390/act8020035 - 24 Apr 2019
Cited by 1
Abstract
An active vibration control approach from an online estimation perspective of unavailable feedback signals for a quarter-vehicle suspension system is introduced. The application of a new signal differentiation technique for the online estimation of disturbance trajectories due to irregular road surfaces and velocity [...] Read more.
An active vibration control approach from an online estimation perspective of unavailable feedback signals for a quarter-vehicle suspension system is introduced. The application of a new signal differentiation technique for the online estimation of disturbance trajectories due to irregular road surfaces and velocity state variables is described. It is assumed that position measurements are only available for active disturbance suppression control implementation. Real-time signal differentiation is independent of detailed mathematical models of specific dynamic systems and control force generation mechanisms. Active control forces can be supplied by electromagnetic or hydraulic actuators. Analytical and simulation results prove the effective and fast dynamic performance of the online signal estimation as well as a satisfactory active disturbance attenuation on a quarter-vehicle active suspension system. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators)
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Open AccessArticle
Stabilization of Magnetic Suspension System by Using Only a First-Order Reset Element without a Derivative Element
Actuators 2019, 8(1), 24; https://doi.org/10.3390/act8010024 - 09 Mar 2019
Abstract
The stabilization of a magnetic suspension system is achieved by using a low-pass filter (LPF) with a nonlinear integrator without any other element. A proportional-derivative (PD) control is commonly used as the simplest method of stabilizing a magnetic suspension system. Meanwhile, a first-order [...] Read more.
The stabilization of a magnetic suspension system is achieved by using a low-pass filter (LPF) with a nonlinear integrator without any other element. A proportional-derivative (PD) control is commonly used as the simplest method of stabilizing a magnetic suspension system. Meanwhile, a first-order reset element (FORE) was applied to improve transient characteristics. The original FORE was a first-order LPF with a nonlinear reset integrator element. A magnetic suspension system cannot be stabilized by a linear LPF, nor the original FORE. In this work, the reset conditions of the FORE were modified for magnetic suspension. This modified FORE succeeded in stabilizing a magnetic suspension system. The efficacy of the modified FORE was demonstrated by simulations and experiments. A single degree of freedom magnetic suspension system was used in the experiment. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators)
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Open AccessArticle
Analysis of a Shaftless Semi-Hard Magnetic Material Flywheel on Radial Hysteresis Self-Bearing Drives
Actuators 2018, 7(4), 87; https://doi.org/10.3390/act7040087 - 10 Dec 2018
Cited by 3
Abstract
Flywheel Energy Storage Systems are interesting solutions for energy storage, featuring advantageous characteristics when compared to other technologies. This has motivated research effort focusing mainly on cost aspects, system reliability and energy density improvement. In this context, a novel shaftless outer-rotor layout is [...] Read more.
Flywheel Energy Storage Systems are interesting solutions for energy storage, featuring advantageous characteristics when compared to other technologies. This has motivated research effort focusing mainly on cost aspects, system reliability and energy density improvement. In this context, a novel shaftless outer-rotor layout is proposed. It features a semi-hard magnetic FeCrCo 48/5 rotor coupled with two bearingless hysteresis drives. The novelty lies in the use of the semi-hard magnetic material, lending the proposed layout advantageous features thanks to its elevated mechanical strength and magnetic properties that enable the use of bearingless hysteresis drives. The paper presents a study of the proposed layout and an assessment of its energetic features. It also focuses on the modeling of the radial magnetic suspension, where the electromagnets providing the levitating forces are modeled through a one-dimensional approach. The Jiles–Atherton model is used to describe the magnetic hysteresis of the rotor material. The proposed flywheel features a mass of 61.2 kg, a storage capability of 600 Wh at the maximum speed of 18,000 rpm and achieves an energy density of 9.8 Wh/kg. The performance of the magnetic suspension is demonstrated to be satisfactory and the influence of the hysteresis of the rotor material is highlighted. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators)
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Open AccessArticle
Modeling and Validation of the Radial Force Capability of Bearingless Hysteresis Drives
Actuators 2018, 7(4), 69; https://doi.org/10.3390/act7040069 - 02 Oct 2018
Cited by 4
Abstract
The hysteresis motor technology combined with the magnetic suspension makes bearingless hysteresis drives very appealing for high- and ultra-high-speed applications. Such systems exploit the magnetic behavior of the rotor material to achieve mechanical torque, but the hysteresis can significantly influence the magnetic suspension [...] Read more.
The hysteresis motor technology combined with the magnetic suspension makes bearingless hysteresis drives very appealing for high- and ultra-high-speed applications. Such systems exploit the magnetic behavior of the rotor material to achieve mechanical torque, but the hysteresis can significantly influence the magnetic suspension performance. The literature so far has focused mainly on the motor investigation. On the bearing side, the design and the performance assessment have been carried out by neglecting the hysteresis phenomenon of the rotor material. In those cases, the hysteresis of the rotor material is negligible and hence it slightly affects the force generation. In a wider perspective, this paper intends to investigate the force capability of electromagnetic actuators based on materials of large magnetic hysteresis behavior. To this purpose, the proposed numerical model, based on the finite element method, accounts for the magnetic hysteresis. The experimental results confirm the validity of the modeling approach, thus providing a useful tool for the design as well as the investigation of such systems. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators)
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Open AccessArticle
Optimization of Axial Magnetic Bearing Actuators for Dynamic Performance
Actuators 2018, 7(4), 66; https://doi.org/10.3390/act7040066 - 28 Sep 2018
Cited by 1
Abstract
Axial magnetic bearing actuators often lack the bandwidth necessary to achieve the desired closed loop performance due to their nonlaminated construction. Since bandwidth can be directly related to actuator material and geometric properties, an opportunity exists to improve closed loop performance through the [...] Read more.
Axial magnetic bearing actuators often lack the bandwidth necessary to achieve the desired closed loop performance due to their nonlaminated construction. Since bandwidth can be directly related to actuator material and geometric properties, an opportunity exists to improve closed loop performance through the optimization of these properties. This prospect is exploited herein, both to demonstrate the improvements that can be obtained and to illustrate the relationship between various parameters and dynamic performance. For the latter, Pareto-optimal curves are generated exploring the influence that disk outer radius, peak force, axial gap, and magnetic permeability have upon actuator bandwidth. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators)
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Open AccessArticle
Offset-Free Model Predictive Control for Active Magnetic Bearing Systems
Actuators 2018, 7(3), 46; https://doi.org/10.3390/act7030046 - 07 Aug 2018
Cited by 10
Abstract
This paper presents the study of linear Offset-Free Model Predictive Control (OF-MPC) for an Active Magnetic Bearing (AMB) application. The method exploits the advantages of classical MPC in terms of stability and control performance and, at the same time, overcomes the effects of [...] Read more.
This paper presents the study of linear Offset-Free Model Predictive Control (OF-MPC) for an Active Magnetic Bearing (AMB) application. The method exploits the advantages of classical MPC in terms of stability and control performance and, at the same time, overcomes the effects of the plant-model mismatch on reference tracking. The proposed approach is based on a disturbance observer with an augmented plant model including an input disturbance estimation. Besides the abovementioned advantages, this architecture allows a real-time estimation of low-frequency disturbance, such as slow load variations. This property can be of great interest for a variety of AMB systems, particularly where the knowledge of the external load is important to regulate the behavior of the controlled plant. To this end, the paper describes the modeling and design of the OF-MPC architecture and its experimental validation for a one degree of freedom AMB system. The effectiveness of the method is demonstrated in terms of the reference tracking performance, cancellation of plant-model mismatch effects, and low-frequency disturbance estimation. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators)
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Open AccessArticle
Lateral Vibration Suppression by Varying Stiffness Control in a Vertically Active Magnetic Suspension System
Actuators 2018, 7(2), 21; https://doi.org/10.3390/act7020021 - 10 May 2018
Cited by 4
Abstract
Reduction of vibration in passively supported lateral directions by varying stiffness control is discussed in a vertically active magnetic suspension system. In the target system, one pair of electromagnets is arranged in differential driving mode to actively control the vertical motion of the [...] Read more.
Reduction of vibration in passively supported lateral directions by varying stiffness control is discussed in a vertically active magnetic suspension system. In the target system, one pair of electromagnets is arranged in differential driving mode to actively control the vertical motion of the floator. Usually the floator is prone to vibrate in the lateral direction because it is passively supported by virtue of the edge effect of the electromagnets. In this work, such vibrations are reduced by incrementing or decrementing the currents simultaneously during vibration without changing the vertical position of the floator. This control strategy is implemented in a developed apparatus where an iron ball is suspended by differentially operated electromagnets without any mechanical contact. Experiments are carried out, and the results show the reduction of lateral vibrations without changing the vertical position of the floator. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators)
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