Special Issue "Magnetic Bearing Actuators"

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

Deadline for manuscript submissions: 31 January 2019

Special Issue Editor

Guest Editor
Prof. Takeshi Mizuno

Department of Mechanical Engineering, Saitama University, Shimo-Okubo 255, Skuara-ku, Saitama 338-8570, Japan
Website | E-Mail
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 350 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 (4 papers)

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Research

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
Received: 31 August 2018 / Revised: 20 September 2018 / Accepted: 28 September 2018 / Published: 2 October 2018
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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
Received: 3 September 2018 / Revised: 13 September 2018 / Accepted: 25 September 2018 / Published: 28 September 2018
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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
Received: 9 July 2018 / Revised: 1 August 2018 / Accepted: 6 August 2018 / Published: 7 August 2018
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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
Received: 22 March 2018 / Revised: 20 April 2018 / Accepted: 27 April 2018 / Published: 10 May 2018
Cited by 1 | PDF Full-text (8351 KB) | HTML Full-text | XML Full-text
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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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Modeling and characterization of a flexible rotor supported by active Magnetic bearings using model reduction techniques
Authors: Felipe C. Carvalho, Marcus V. F. de Oliveira, Bruno L. Pereira, Aldemir Ap. Cavalini Jr, Valder Steffen Jr
Abstract: Active magnetic bearings (AMBs) have attracted the attention of researchers to find new applications and make them viable for industrial applications. AMBs technology has now achieved a considerable level of maturity, and represents one of the most promising solutions for several applications involving rotating machinery. In such devices, the rotating shaft levitates suspended by magnetic forces, preventing from any wear due to mechanical contact between the bearings and the rotor journals. AMBs are lubricant free, reaching high speeds without any relevant heating. In this context, the present work is devoted to the design of a reduced model of an experimental test rig composed of a flexible shaft supported by two radial AMBs. For this purpose, this study was divided into two parts. The first part is dedicated to the development of individual numerical models to represent the dynamic behavior of each subsystem that composes the rotor system, as based on the design characteristics of each subsystem. Thereafter, the models of the subsystem are assembled together to obtain a representative model of the entire system. Then, model reduction techniques are applied to make the system simpler and still representative. Next step is the correlation of the numerical models with the experimental results for validation purposes. Based on the data obtained, the stability analysis of the system is performed by considering existing standards for magnetic bearings. The obtained results demonstrate the representativeness of the reduced model.
Keywords: Active Magnetic Bearing, Reduced Model, Model validation, Control 

 

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