Magnetic Bearings: From Theory to Applications

A special issue of Actuators (ISSN 2076-0825). This special issue belongs to the section "High Torque/Power Density Actuators".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 7352

Special Issue Editor

Department of Mechanical Engineering, College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga, Japan
Interests: magnetic bearings; self-bearing motors; control of magnetic bearings; applications of magnetic bearings and self-bearing motors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue focuses on magnetic bearings. Magnetic bearings can support the rotor without mechanical contact, and have many merits, such as low-loss, high-speed rotation, maintenance-free operation, etc. Recently, the performance of the magnetic bearings has improved and the number of applications has increased due to the progress of the associated electronics, manufacturing technologies, materials, etc. The aim of this Special Issue is to collect the latest research papers and reviews of the applications of magnetic bearings. The topics of interests include, but are not limited to:

  • Analysis and modeling of magnetic bearings;
  • Control of magnetic bearings;
  • Control of the rotor motion by magnetic bearings;
  • Sensing techniques (low-cost sensors, self-sensing, etc.);
  • Power electronics for magnetic bearings;
  • Self-bearing/bearingless motors;
  • Applications of magnetic bearings (pumps, turbines, compressors, etc.).

Prof. Dr. Ueno Satoshi
Guest Editor

Manuscript Submission Information

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Keywords

  • active magnetic bearings
  •  passive magnetic bearings
  •  self-bearing/bearing-less motors
  • superconductors
  • diamagnetic bearings
  • magnetic levitation
  • control of magnetic bearings
  •  applications of magnetic bearings

Published Papers (2 papers)

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Research

16 pages, 1906 KiB  
Article
Design Method of Bearingless Permanent Magnet Slice Motor for Maglev Centrifugal Pump Based on Performance Metric Cluster
by Yifan Zhang, Liang Hu, Rui Su and Xiaodong Ruan
Actuators 2021, 10(7), 153; https://doi.org/10.3390/act10070153 - 05 Jul 2021
Cited by 4 | Viewed by 2504
Abstract
Different from ordinary AC machines, the design of a bearingless permanent magnet slice motor (BPMSM) considers not only the torque performance, but also the passive and active suspension properties. In addition, BPMSM for a maglev centrifugal pump has unique design characteristics due to [...] Read more.
Different from ordinary AC machines, the design of a bearingless permanent magnet slice motor (BPMSM) considers not only the torque performance, but also the passive and active suspension properties. In addition, BPMSM for a maglev centrifugal pump has unique design characteristics due to the integration of the pump head and sensors. This paper investigates evaluation and design techniques based on a cluster of performance metrics targeting on developing BPMSM for a maglev centrifugal pump. The cluster of performance metrics for BPMSM, including passive stiffness (kz, kz/kx, kz/ky, kα, and kβ) and active factors (ki and cm), is first proposed and an evaluation function fiSi,Li is constructed. Then, practical configurations of BPMSM for a maglev centrifugal pump are summarized. Based on the cluster of performance metrics, the finite-element method (FEM) is used to explore the impact of the rotor magnetization (sinusoidal, diametric, and radial method) on motor properties. Subsequently, the complete design process of BPMSM for a maglev centrifugal pump is introduced and key differences (including three crucial geometric parameters: ratio of rotor height to diameter λ, magnetic gap length δ, and stator tooth width αst) in the design considerations between BPMSM and general bearingless motors are analyzed. Finally, the upgraded performance (kz, kα, kβ, ki, cm, and fiSi,Li increased by about 29%, 38%, 33%, 31%, 21%, and 15%, respectively) of the designed candidate is obtained, which verifies the effectiveness of the proposed design methods. Full article
(This article belongs to the Special Issue Magnetic Bearings: From Theory to Applications)
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16 pages, 12308 KiB  
Article
Three-Axis Inductive Displacement Sensor Using Phase-Sensitive Digital Signal Processing for Industrial Magnetic Bearing Applications
by Teemu Sillanpää, Alexander Smirnov, Pekko Jaatinen, Jouni Vuojolainen, Niko Nevaranta, Rafal Jastrzebski and Olli Pyrhönen
Actuators 2021, 10(6), 115; https://doi.org/10.3390/act10060115 - 31 May 2021
Cited by 8 | Viewed by 3305
Abstract
Non-contact rotor position sensors are an essential part of control systems in magnetically suspended high-speed drives. In typical active magnetic bearing (AMB) levitated high-speed machine applications, the displacement of the rotor in the mechanical air gap is measured with commercially available eddy current-based [...] Read more.
Non-contact rotor position sensors are an essential part of control systems in magnetically suspended high-speed drives. In typical active magnetic bearing (AMB) levitated high-speed machine applications, the displacement of the rotor in the mechanical air gap is measured with commercially available eddy current-based displacement sensors. The aim of this paper is to propose a robust and compact three-dimensional position sensor that can measure the rotor displacement of an AMB system in both the radial and axial directions. The paper presents a sensor design utilizing only a single unified sensor stator and a single shared rotor mounted target piece surface to achieve the measurement of all three measurement axes. The sensor uses an inductive measuring principle to sense the air gap between the sensor stator and rotor piece, which makes it robust to surface variations of the sensing target. Combined with the sensor design, a state of the art fully digital signal processing chain utilizing synchronous in-phase and quadrature demodulation is presented. The feasibility of the proposed sensor design is verified in a closed-loop control application utilizing a 350-kW, 15,000-r/min high-speed industrial induction machine with magnetic bearing suspension. The inductive sensor provides an alternative solution to commercial eddy current displacement sensors. It meets the application requirements and has a robust construction utilizing conventional electrical steel lamination stacks and copper winding. Full article
(This article belongs to the Special Issue Magnetic Bearings: From Theory to Applications)
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