A New Passive Maglev System Based on Eddy Current Stabilization

Musolino, Antonino; Rizzo, Rocco; Tucci, Mauro; Матросов, В.М.

doi:10.1109/tmag.2009.2012533

Cited by 30 publications

(13 citation statements)

References 2 publications

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“…Contactless bearings based in both permanent magnets and superconducting magnetic levitation are of interest in order to avoid all the tribological problems, such as friction, wear, or energy losses [21][22][23][24][25][26] associated with contact at very low temperatures [12]. In addition, there is no contact between the moving parts, so lubrication is not required.…”

Section: Superconducting Magnetic Bearings (Smb)mentioning

confidence: 99%

Performance of Magnetic-Superconductor Non-Contact Harmonic Drive for Cryogenic Space Applications

et al. 2015

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Abstract:Harmonic drives are profusely used in aerospace mainly because of their compactness and large reduction ratio. However, their use in cryogenic environments is still a challenge. Lubrication and fatigue are non-trivial issues under these conditions. The objective of the Magnetic-Superconductor Cryogenic Non-contact Harmonic Drive (MAGDRIVE) project, funded by the EU Space FP7, is to design, build, and test a new concept of MAGDRIVE. Non-contact interactions among magnets, soft magnetic materials, and superconductors are efficiently used to provide a high reduction ratio gear that smoothly and naturally operates at cryogenic environments. The limiting elements of conventional harmonic drives (teeth, flexspline, and ball bearings) are substituted by contactless mechanical components (magnetic gear and superconducting magnetic bearings). The absence of contact between moving parts prevents wear, lubricants are no longer required, and the operational lifetime is greatly increased. This is the first mechanical reducer in mechanical engineering history without any contact between moving parts. In this paper, the test results of a −1:20 inverse reduction ratio MAGDRIVE prototype are reported. In these tests, successful operation at 40 K and 10 −3 Pa was demonstrated for more than 1.5 million input cycles. A maximum torque of 3 N· m and an efficiency of 80% were demonstrated. The maximum tested input speed was 3000 rpm, six times the previous existing record for harmonic drives at cryogenic temperatures.

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Section: Superconducting Magnetic Bearings (Smb)mentioning

confidence: 99%

Performance of Magnetic-Superconductor Non-Contact Harmonic Drive for Cryogenic Space Applications

et al. 2015

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“…Both these approaches are based upon the following consideration: according to (6), when two axial magnetisations are considered (θ I = θ E = 0 • ) the force on each element depends only on A 4 . Similarly when θ I = θ E = 90 • − α only A 1 is involved, when θ I = 90 • − α, θ E = 0 the force is proportional to A 2 , and finally when to θ I = 0, θ E = 90 • − α the force is proportional to A 3 .…”

Section: Geometric Vectors Evaluationmentioning

confidence: 99%

“…The question of instability can be faced in different ways, e.g., by introducing an active control or diamagnetic elements or superconductors. In addition the element shapes and the field directions can be conveniently modified in order to reduce the unstable force [6]. In this way, although the question of instability is not completely solved, the control system can be prompter and more reliable.…”

Section: Introductionmentioning

confidence: 99%

Permanent Magnet Bearings: Analysis of Plane and Axisymmetric v-Shaped Element Design

Puccio¹,

Bassani²,

Ciulli³

et al. 2012

PIER M

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Abstract-Applications of permanent magnets bearings have gained a new interest thanks to the development of rare earth materials, characterised by residual magnetic induction greater than 1 T. The present paper proposes a new geometry for permanent magnets bearings with V-shaped elements, both for a plane slide and for cylindrical bearings. The aim of this geometry is to give new possibilities to the application of these bearing systems, by reducing its inherent instability. A design method, involving Finite Elements and Magnetic Field Integral Equations analyses, is also described for defining the most suitable V-opening angle and the two magnetisation directions. These parameters can be varied in order to reduce the unstable force in the coupling, and to reach the desired force and stiffness in the stable direction. The design is founded on the evaluation of four "geometric" vectors, that depend on the geometry of the elements. Some results are reported for a reference geometry for both the slide and the cylindrical bearings.

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“…The availability of an analytical solution has a twofold utility: 1) allows a deep understanding of the operation of the device and of its potentialities and drawbacks; 2) constitutes a benchmark for the validation of numerical codes that are indispensable in the analysis of real devices. However, the proposed formulation can be used also for the investigation of magnetic levitation systems [11]. The paper is organized as follows: in Section II the problem setup is discussed in detail.…”

Section: Introductionmentioning

confidence: 99%

Analytical model of a travelling wave multipole field electromagnetic launcher

Musolino

Rizzo

Tripodi

2012

2012 16th International Symposium on Electromagnetic Launch Technology

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The problem of the evaluation of eddy currents induced in a conductive cylinder is here reconsidered under the light of possible application in the electromagnetic launch context. In particular we derive an analytical solution when the system is excited by a sinusoidal current flowing on a saddle coil moving in the axial direction. Subsequently we consider an arrangement of such coils distributed in the axial and azimuth direction. When properly fed they produce a travelling wave of flux distribution which is able to exert a thrust force on the conductive cylinder. Since the governing vector field equation is not separable in the cylindrical coordinate, an approach based on the second order vector potential (SOVP) formulation has been here adopted. Scalar field equations are obtained whose solutions are expressed in terms of Bessels function.

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A New Passive Maglev System Based on Eddy Current Stabilization

Cited by 30 publications

References 2 publications

Performance of Magnetic-Superconductor Non-Contact Harmonic Drive for Cryogenic Space Applications

Performance of Magnetic-Superconductor Non-Contact Harmonic Drive for Cryogenic Space Applications

Permanent Magnet Bearings: Analysis of Plane and Axisymmetric v-Shaped Element Design

Analytical model of a travelling wave multipole field electromagnetic launcher

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