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Actuators
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Magnetic Bearing Actuators II
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Magnetic Bearing Actuators II

A special issue of Actuators (ISSN 2076-0825). This special issue belongs to the section "Miniaturized and Micro Actuators".

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 3812

Special Issue Editor

Prof. Dr. Takeshi Mizuno

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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 Issues, Collections and Topics in MDPI journals

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, control, sensing, and evaluation. Linear magnetic bearings for non-rotating objects are also targeted.

This Special Issue will follow the former one: "Magnetic Bearing Actuators" that focused on the various aspects of the electromagnetic actuator.

Prof. Dr. 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 submissions that pass pre-check are 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 monthly 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 2400 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
  • control
  • sensing
  • special-environment operations
  • reduction of hardware

Published Papers (2 papers)

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Research

16 pages, 4616 KiB  
Article
Design of a Noncontact Torsion Testing Device Using Magnetic Levitation Mechanism
by Mengyi Ren and Koichi Oka
Actuators 2023, 12(4), 174; https://doi.org/10.3390/act12040174 - 17 Apr 2023
Cited by 1 | Viewed by 1250
Abstract
To facilitate torsion testing in special environments, a noncontact torsion testing device, where a noncontact torque can be transmitted to a specimen, was developed using magnetic levitation technology. A permanent magnetic gear is used to produce noncontact torque. In addition, four electromagnets and [...] Read more.
To facilitate torsion testing in special environments, a noncontact torsion testing device, where a noncontact torque can be transmitted to a specimen, was developed using magnetic levitation technology. A permanent magnetic gear is used to produce noncontact torque. In addition, four electromagnets and four attractive-type permanent magnetic bearings were employed to realize levitation; in more detail, the four electromagnets actively stabilized two levitation degrees of freedom (DoFs), while the four attractive-type permanent magnetic bearings passively stabilized four DoFs. Furthermore, a plant model considering the effect caused by the four attractive-type permanent magnetic bearings was built for the two levitation DoFs requiring active control. Based on the plant model, two PD-controllers were designed. Moreover, a control simulation was conducted to obtain appropriate PD-gains. Finally, experiments further validated the feasibility of the whole scheme, and it was proven that the device can apply a 0.126 N·m torque to the specimen while maintaining levitation. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators II)
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17 pages, 14296 KiB  
Article
Experimental Study on Magnetic Resonant Coupling AC Magnetic Suspension Considering Electrical Power Transmission
by Yuji Ishino, Takeshi Mizuno and Masaya Takasaki
Actuators 2022, 11(8), 208; https://doi.org/10.3390/act11080208 - 28 Jul 2022
Viewed by 1524
Abstract
A three-degree-of-freedom AC magnetic suspension system using magnetic resonant coupling was fabricated. The AC magnetic suspension system can produce restoring force without active control. This system is dynamically stabilized by adding indirect damping, which is produced by suspending to the stator with viscoelastic [...] Read more.
A three-degree-of-freedom AC magnetic suspension system using magnetic resonant coupling was fabricated. The AC magnetic suspension system can produce restoring force without active control. This system is dynamically stabilized by adding indirect damping, which is produced by suspending to the stator with viscoelastic support mechanisms. A non-contact electrical power transmission is achieved simultaneously by magnetic resonant coupling. The structure of magnetic resonant coupling is similar to the structure of the transformer. The magnetic flux path for suspension is combined with that of electrical power transmission. The electric characteristics of the transformer depend on the resistance of a load connecting the secondary circuit. The measured results indicate that the driving frequency needs to be adjusted to achieve stable suspension in relation to the resistance of the load. These characteristics are confirmed experimentally. Full article
(This article belongs to the Special Issue Magnetic Bearing Actuators II)
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