Investigation of Linear Induction Motor According to Secondary Conductor Structure

Byung-Jun, Lee; Koo, Dae‐Hyun; Cho, Yun‐Hyun

doi:10.1109/tmag.2009.2018687

Cited by 51 publications

(11 citation statements)

References 6 publications

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“…7a, it is found that we need 300-400 ms in order to obtain the thrust at the steady state. Hence B z and J sy , which are denoted in (5), both are sinusoidal components, second harmonics are added to thrust. The thrust of SLIM with transverse symmetry are 17, 13.6 and 9.1 kN when frequencies are 5, 15 and 35 Hz, respectively.…”

Section: Experiments Resultsmentioning

confidence: 99%

“…The calculation accuracy is improved and much more structure parameters can be considered by finite‐element method (FEM). In [5], air‐gap flux density, thrust and vertical force are analysed by 2D FEM with an external circuit. In [6], finite‐element formulation is applied and the electromagnetic field problem is solved for the magnetic vector potential.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetism calculation of single‐sided linear induction motor with transverse asymmetry using finite‐element method

Liu

Sun

2016

IET Electric Power Applications

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Electromagnetic variations of the single-sided linear induction motor (SLIM) are calculated by threedimensional (3D) finite-element method (FEM) when the primary is displaced sideways from a symmetrical position. For geometrical and electrical asymmetry, a full 3D model, which considering the longitudinal and transverse end effects, overhangs of the primary windings and secondary, as well as lateral displacement, is developed. Apart from the thrust and vertical force, lateral force is produced when the transverse asymmetry occurred. Hence, the calculation equation of thrust, vertical and lateral forces in each element of the 3D FEM model and boundary conditions are presented. Air-gap flux densities along the longitudinal and transverse directions with different lateral displacements are obtained, as well as the distortion coefficients of the air-gap flux density is proposed. Corresponding induced currents in the secondary are predicted. Finally, the variations of the thrust, vertical and lateral forces are experimentally validated by measurements on reciprocal power-fed test rig. It shows that the flux in between overhangs of the primary winding and secondary has great effect on the lateral force, the thrust and vertical force decrease with the increase of the lateral displacement.

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Section: Experiments Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electromagnetism calculation of single‐sided linear induction motor with transverse asymmetry using finite‐element method

Liu

Sun

2016

IET Electric Power Applications

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“…By now, there are more than 20 commercial linear metro lines of about 400 kilometers in the world, such as the Kennedy air line in America, the linear metro in Japan, the Vancouver light train in Canada, the Guangzhou subway line 4 and the Beijing airport rapid transport line in China, and so on. The SLIM drive system has the following merits compared with the RIM drive [9][10][11][12][13][14][15][16]. Firstly, it can achieve direct propulsive thrust, which is not dependent on the friction between wheel and rail.…”

Section: Nomenclature σmentioning

confidence: 99%

“…However, this now needs to be referred to primary where the coordination is relatively still to the primary. Hence, the speed term in the right side of (2) can be ignored, and then we can get (11) With the knowledge of the air-gap flux density distribution, the electric field intensity produces three terms: E 0 , E 1 and E 2 which are deduced in appendix I. These individually produce an induced electromotive force in the machine windings so that…”

Section: Physical Modelmentioning

confidence: 99%

An Improved Equivalent Circuit Model of a Single-Sided Linear Induction Motor

Zhu

Zhang

et al. 2010

IEEE Trans. Veh. Technol.

125

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The derivation of the equivalent circuit for a single-sided linear induction motor (S LIM) is not straightforward, particularly if it includes longitudinal end effects from the cut-open primary magnetic path, transversal edge effects from the differing widths between the primary lamination and secondary sheet, and half filled primary slots. This paper proposes an improved series equivalent circuit for this machine. The longitudinal end effects are estimated using three different impedances representing the normal, forwards and backwards flux density waves in the air-gap, whose two boundary conditions are deduced by introducing the conception of magnetic barrier surface. The transversal edge effects are accounted by correction coefficient t K and an air-gap flux density correction coefficient b K. Using the series circuit, the performance of the S LIM was assessed in a similar manner to a rotating induction machine. A 4 kW S LIM prototype was tested which validated the simulation technique.

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“…Many researches were conducted on the design [4] and analysis [5][6][7][8] of a LIM, as well as its application in transportation systems [9][10][11][12] that were focused on two or three-dimensional analytical and numerical methods. The complexities of these methods are high, as well as their accuracy.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Double-Sided Linear Induction Motor for Transportation

2015

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An air-bus system is proposed as one of the alternatives for urban mass transportation. The propulsive force of this system is generated by a linear motor. Several single or double-sided linear motor topologies could be employed, but a double-sided linear induction motor (DSLIM) is preferred, due to its simple passive track, and high value of force density. Several researches were carried out to develop analytical models for analysis of linear induction motor performance. In this research, a quasi one-dimensional analytical method is proposed in order to analyze motor performance, whereas the longitudinal and transversal edge effects are considered as well. Accuracy of the proposed method, is evaluated by comparison of the analytical results with the experimental data that shows acceptable conformity. Then, the motor design for the desired application is presented, and its performance is evaluated by both finite element method and analytical modeling. Derivations of major equations are given as well. Index Terms-linear induction motor; double sided; longitudinal end effect; transversal edge effect; Maxwell equations

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Investigation of Linear Induction Motor According to Secondary Conductor Structure

Cited by 51 publications

References 6 publications

Electromagnetism calculation of single‐sided linear induction motor with transverse asymmetry using finite‐element method

Electromagnetism calculation of single‐sided linear induction motor with transverse asymmetry using finite‐element method

An Improved Equivalent Circuit Model of a Single-Sided Linear Induction Motor

Design and Analysis of a Double-Sided Linear Induction Motor for Transportation

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