Computation of eddy current losses in the mounting rail of a magnetically levitated conveyor vehicle

Leßmann, Marc; Hameyer, Kay

doi:10.1108/03321640610666880

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…But the more relevant losses are the iron losses. In [5] it is shown that the eddy current losses amount to 200 W at 10 m/s for all four magnets.…”

Section: ) Levitation Lossesmentioning

confidence: 98%

“…2) Propulsion Losses: The iron losses of the linear drives will increase from zero at standstill to 300 W at 10 m/s [5]. To compensate the overall iron losses of the system at this speed the propulsion has to produce a force of This means that the copper losses are only 20 W at constant speed.…”

Section: ) Levitation Lossesmentioning

confidence: 98%

“…In this equation the magnetic levitation forces, the damping forces due to the eddy-currents induced in the track and the position dependent propulsion and cogging forces (Fig. 6), which have been calculated by the finite element method in a previous research [5], [6], are considered.…”

Section: A Mechanical Modelmentioning

confidence: 99%

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Mathematical description and control design for the simultaneous levitation and propulsion of a conveyor vehicle

Herold

Pohlmann

Hameyer

2009

2009 IEEE International Electric Machines and Drives Conference

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Magnetic levitation is still an important issue for industry and research. Wherever high dynamics, position accuracy, high reliability and low mechanical wear are required, magnetic levitation is an effective alternative to conventional technologies. Conventional systems with mechanical guiding have shown to be limited in speed. For transporting goods over long distances, levitation can thus lead to a significant saving in time and cost. This paper describes a control design for an autonomous magnetically levitated conveyor vehicle with a linear direct drive for propulsion. Based on a mathematical description as a 2-rigid-body system with elastic coupling in torsion, a simulation environment for the vehicle is created. After that, a degree-of-freedom control is designed for the levitation operation, whereas a conventional PI control is used for the propulsion. This control design is based on the representation of the system as a 2-body system as well. The combination of control and simulation environment offers the opportunity for extensive testing and optimization before the control is applied to a test bench. By intensive analysis the stable and efficient operation of the vehicle is determined. An assortment of measurement results is presented and discussed in this paper.

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“…But the more relevant losses are the iron losses. In [5] it is shown that the eddy current losses amount to 200 W at 10 m/s for all four magnets.…”

Section: ) Levitation Lossesmentioning

confidence: 98%

Section: ) Levitation Lossesmentioning

confidence: 98%

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Mathematical description and control design for the simultaneous levitation and propulsion of a conveyor vehicle

Herold

Pohlmann

Hameyer

2009

2009 IEEE International Electric Machines and Drives Conference

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“…Finite‐element analysis software is suitable to analyze electromagnetic characteristics (Leßmann and Hameyer, 2006). Finite‐element method (FEM) based software ANSOFT is used to analyze the proposed BSRM in several static states, assuming motor axis symmetry.…”

Section: Electromagnetic Analysis Of the Proposed Bsrmmentioning

confidence: 99%

A novel bearingless switched reluctance motor

Wang

Ge²,

Wu³

et al. 2012

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -This paper seeks to propose a novel bearingless switched reluctance motor (BSRM). Design/methodology/approach -The operating principle and structure characteristics of the proposed three-phase 12/8-pole BSRM is analyzed in detail. Finite element method-based calculations are applied to a prototype and some important characteristics are obtained, including radial force, static torque, air-gap magnetic flux density, and effect of control winding current on the torque, where magnetic saturation is taken into account by using a nonlinear B-H curve. Findings -On the basis of the simulated results, it can be concluded that the proposed BSRM presents an excellent performance in the suspending force and in the torque. The analyzed results show that the two control-winding currents can effectively control the radial suspending forces and produce negligible effect on the motor torque, which is mainly produced by the main-winding currents. Originality/value -In this paper, a novel BSRM is proposed. Instead of the six sets of radial suspending control windings required by conventional three-phases BSRM, the proposed structure requires only two sets of suspending control windings, regardless of the phase number, leading to a simpler power converter with less power switches, thus lowering the overall system cost.

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“…The lower is the friction between the chain and the beam, the lower is the power consumption and the surface wear. The magnetic levitation technology can be utilized to reduce friction using properly designed coils (Leßmann and Hameyer, 2006;Hong and Kim, 2008) or permanent magnets (PM) (Moser et al, 2006;Ravaud et al, 2009a, b;Long et al, 2011;Bachovchin et al, 2013). Passive repulsive bearing using PM have been extensively studied and can be used in motors, turbines, flywheels, etc.…”

Section: Introductionmentioning

confidence: 99%

Design and testing of a magnetic suspension for a 90° horizontal bend conveyor

Fabbri

Ribani

Zuffa³

2015

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -A conveyor device is studied with the aim to reduce the friction between the inner surface of the beam and the chain. The lower is the friction between the chain and the beam, the lower is the surface wear. The magnetic repulsion force among permanent magnets (PMs) placed on the beam and on the chain is utilized to reduce friction. The paper aims to discuss these issues. Design/methodology/approach -The considered magnetic suspension is realized with PMs in repulsive configuration; it is designed by solving a constrained optimization problem, with reference to the geometry of the 901 horizontal bend FlexLink WL322 conveyor. Flux density field and its gradient are evaluated using volume integral equation method, allowing to calculate the forces acting on the chain and the stiffness of the magnetic suspension. Findings -The magnetic suspension prototype was manufactured and tested. The experimental and calculated values of the forces acting on the chain compares well. A stable horizontal equilibrium of the chain was obtained during both static and dynamical tests.Research limitations/implications -The quasi-static model used neglects the dynamical interactions among the elements of the chain, the PMs and loads weight during motions and the eddy current losses in the aluminium beam. However the dynamical tests on the prototype show that the chain motion is regular up to the nominal velocity all along the conveyor with the exception of the trailing edge of the 901 curve. Practical implications -The tests on the prototype show the possibility of a removal or at least a reduction of the friction force between the chain and the inner side of the beam by means of a passive magnetic suspension. As a consequence a reduction of noise and vibrations and an increase of the mean-time-to-failure is expected. Originality/value -Prototype testing shows that the unavoidable vertical instability of the magnetic forces has no practical consequence since, reducing the allowed vertical gap, the chain is stabilized by the gravitational force.

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Computation of eddy current losses in the mounting rail of a magnetically levitated conveyor vehicle

Cited by 7 publications

References 3 publications

Mathematical description and control design for the simultaneous levitation and propulsion of a conveyor vehicle

Mathematical description and control design for the simultaneous levitation and propulsion of a conveyor vehicle

A novel bearingless switched reluctance motor

Design and testing of a magnetic suspension for a 90° horizontal bend conveyor

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