Special Issue "Electromagnetic Levitation Actuators"

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

Deadline for manuscript submissions: closed (31 March 2021).

Special Issue Editor

Dr. Kirill V. Poletkin
E-Mail Website
Guest Editor
1. Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2. Innopolis University, 1, Universitetskaya Str., 42500 Innopolis, Russia
Interests: levitating micro-actuators; levitating micro-systems; inductive levitation; micro-inertial sensors; energy transfer; heat transfer; modeling; stability; pull-in dynamics
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Special Issue Information

Dear Colleagues,

Electromagnetic levitation phenomena have already become a driving force towards creating a new generation of actuators with inherent benefits, such as controllable mechanical friction, considerably extended motional range, thereby yielding actuators with wider operational capabilities, and at the same time, significantly reducing the dissipated energy. Complete elimination of mechanical attachments and, consequently, mechanical wear and control of mechanical friction by means of vacuum in such actuators open up a number of advantages, offering their further miniaturization and significant improvements in performance, and the promise of actuators with longer operational lifetimes. This Special Issue is aimed at collecting original papers and state-of-the-art reviews with a focus on levitating actuators based on electric, magnetic, inductive, diamagnetic, superconducting, optical, and hybrid levitation.

The topics of interest include but are not limited to:

  • Bulk- and micro-fabrication, and new magnetic, optical materials and meta-materials;
  • New conceptual designs of levitating actuators for application in bearings, motors, energy-harvesters, sensors, etc., as well as microsystem actuators;
  • Nonlinear phenomena in levitating actuators including coupling effects, pull-in dynamics and instability, dissipation induced instability, chaotic behavior, etc.;
  • Analytical and numerical methods related to the topic for modeling and analysis of actuator stability and dynamics (analytical methods based on Lagrangian and Hamiltonian mechanics, FEM, topology optimization, model order reduction, etc.).

Dr. Kirill V. Poletkin
Guest Editor

Manuscript Submission Information

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Keywords

  • Actuators
  • Microactuators
  • Electromagnetic levitation
  • Microsystems
  • Coils
  • Magnets
  • Stable levitation
  • Modeling

Published Papers (5 papers)

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Research

Article
Analysis of High Force Voice Coil Motors for Magnetic Levitation
Actuators 2020, 9(4), 133; https://doi.org/10.3390/act9040133 - 09 Dec 2020
Cited by 3 | Viewed by 1128
Abstract
A voice coil motor is a simple and linear electromagnetic actuator. Since it has a non-contact force and very low stiffness, it is widely used for precision positioning devices including magnetic levitation systems. During magnetic levitation, high force of a voice coil motor [...] Read more.
A voice coil motor is a simple and linear electromagnetic actuator. Since it has a non-contact force and very low stiffness, it is widely used for precision positioning devices including magnetic levitation systems. During magnetic levitation, high force of a voice coil motor is required to compensate for the weight of the device and ensure a fast dynamic response. In this paper, two types of voice coil motors were analyzed by their volumetric change. The change of the generated force according to the volumetric change was inspected by finite element simulation models. The enhancement of force was dependent on which type of the voice coil motor is used, which component is enlarged, and which direction is the voice coil motor expands in. Based on the analysis results, two voice coil motors were optimally designed for a magnetic levitation positioning device. As a result of the design, it was confirmed that different types of voice coil motor generate different forces even if they have the same volume. For the two types of voice coil motors, the force differed by up to 40%. Full article
(This article belongs to the Special Issue Electromagnetic Levitation Actuators)
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Article
Linearizing Control of a Distributed Actuation Magnetic Bearing for Thin-Walled Rotor Systems
Actuators 2020, 9(4), 99; https://doi.org/10.3390/act9040099 - 07 Oct 2020
Cited by 2 | Viewed by 837
Abstract
This paper describes an exact linearizing control approach for a distributed actuation magnetic bearing (DAMB) supporting a thin-walled rotor. The radial DAMB design incorporates a circular array of compact electromagnetic actuators with multi-coil winding scheme optimized for supporting thin-walled rotors. A distinguishing feature [...] Read more.
This paper describes an exact linearizing control approach for a distributed actuation magnetic bearing (DAMB) supporting a thin-walled rotor. The radial DAMB design incorporates a circular array of compact electromagnetic actuators with multi-coil winding scheme optimized for supporting thin-walled rotors. A distinguishing feature is that both the x and y components of the radial bearing force are coupled with all four of the supplied coil currents and so a closed form solution for the linearizing equations cannot be obtained. To overcome this issue, a gradient-based root-finding algorithm is proposed to solve the linearizing equations numerically in real-time. The proposed method can be applied with any chosen constraints on current values to achieve low RMS values while avoiding zero-current operating points. The approach is implemented and tested experimentally on a rotor system comprising two radial DAMBs and a uniform cylindrical shell rotor. The results show that the method achieves more accurate reproduction of demanded bearing forces, thereby simplifying the rotor suspension control design and providing improved stability and vibration control performance compared with implementations based on operating point linearization. Full article
(This article belongs to the Special Issue Electromagnetic Levitation Actuators)
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Article
A Novel Low-Frequency Piezoelectric Motor Modulated by an Electromagnetic Field
Actuators 2020, 9(3), 85; https://doi.org/10.3390/act9030085 - 13 Sep 2020
Cited by 1 | Viewed by 1217
Abstract
For expanding the driving mode of the piezoelectric motor, a novel piezoelectric motor modulated by a magnetic field is proposed. This driving system combines piezoelectric driving and magnetic modulation together and can transform the reciprocating swing of the stator into step running of [...] Read more.
For expanding the driving mode of the piezoelectric motor, a novel piezoelectric motor modulated by a magnetic field is proposed. This driving system combines piezoelectric driving and magnetic modulation together and can transform the reciprocating swing of the stator into step running of the rotor via the intermittent magnetic clamping between the rotor and stator. For investigating the inherent character of dynamics, the dynamic equations of key parts of the driving system are established. The natural frequencies and mode functions of the driving system are solved. A prototype was fabricated to prove the dynamic analysis and measure the output characteristic. The results show that the nature of the frequency measured from the test is coincident with theoretical analysis. In addition, by applying the driving frequency of 3 Hz, the voltage of the modulating signal of 4.5 V, the phase difference α between driving signal and modulating signal of 30°, the ideal outputs are 0.1046 rad/min for velocity and 0.405 Nmm for torque. Full article
(This article belongs to the Special Issue Electromagnetic Levitation Actuators)
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Article
Analytical Analysis of Magnetic Levitation Systems with Harmonic Voltage Input
Actuators 2020, 9(3), 82; https://doi.org/10.3390/act9030082 - 11 Sep 2020
Cited by 1 | Viewed by 1387
Abstract
In this paper, a new analytical method using Lagrange equations for the analysis of magnetic levitation (MagLev) systems is proposed, using Thomson’s jumping ring experiment. The method establishes the dependence of the primary and induced currents, and also the equilibrium height of the [...] Read more.
In this paper, a new analytical method using Lagrange equations for the analysis of magnetic levitation (MagLev) systems is proposed, using Thomson’s jumping ring experiment. The method establishes the dependence of the primary and induced currents, and also the equilibrium height of the levitating object on the input voltage through the mutual inductance of the system. The mutual inductance is calculated in two ways: (i) by employing analytical formula; (ii) through an improved semi-empirical formula based on both measurements and analytical results. The obtained MagLev model was analyzed both analytically and numerically. Analytical solutions to the resulting equations were found for the case of a dynamic equilibrium. The numerical results obtained for the dynamical model under transient operation show a close correspondence with the experimental results. The good precision of the analytical and numerical results demonstrates that the developed method can be effectively implemented. Full article
(This article belongs to the Special Issue Electromagnetic Levitation Actuators)
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Article
A Parametric Solution to the Generalized Bias Linearization Problem
Actuators 2020, 9(1), 14; https://doi.org/10.3390/act9010014 - 04 Mar 2020
Cited by 2 | Viewed by 2634
Abstract
Previously, a generalized bias current linearization was presented for the control of radial magnetic bearings. However, a numerically intensive procedure was required to obtain bias linearization currents. The present work develops an analytical solution to the generalized bias linearization problem in which solutions [...] Read more.
Previously, a generalized bias current linearization was presented for the control of radial magnetic bearings. However, a numerically intensive procedure was required to obtain bias linearization currents. The present work develops an analytical solution to the generalized bias linearization problem in which solutions are indexed by a small number of parameters. The formulation also permits the analytical computation of bias linearization currents for faulted-coil cases. A limitation of the solution presented is that it only applies to stators with an even number of evenly spaces poles of equal area. Full article
(This article belongs to the Special Issue Electromagnetic Levitation Actuators)
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