A Novel Equivalent Circuit Model of Linear Induction Motors Considering Static and Dynamic End Effects

Amiri, Ebrahim; Mendrela, E. A.

doi:10.1109/tmag.2013.2285222

Cited by 58 publications

(23 citation statements)

References 18 publications

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“…3, 4 it can be seen that the magnetic field distribution on both ends of the machine shows typical asymmetry. These end-effects have already been analyzed in many papers, both analytically and numerically [8][9][10][11], [14]. If the machine is supplied from the voltage inverter, this end-effect asymmetry leads to the asymmetry of phase currents.…”

Section: Lim Finite Element Analysismentioning

confidence: 99%

Current mode performance of a traction linear induction motor driven from the voltage converter

Pałka

Woronowicz

2018

Transportation Systems and Technology

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Background: The paper deals with the modelling of a traction Linear Induction Motor (LIM) for public transportation. Typical problems arising from the electromagnetic finite element model development are described. The end effect causes asymmetry of phase impedances of the LIM. Because of that, if the LIM is supplied from the voltage inverter, which is usually the case, the phase currents become asymmetric. This causes performance calculation discrepancies in models that assume phase current symmetry. Aim: The aim of the paper is to develop a method for calculating the imbalanced three-phase LIM currents to precisely predict the LIM performance. Methods: Here, a method is developed to calculate the LIM phase current asymmetry by means of a self-developed electromagnetic finite element program – ELMAG, capable of adapting mesh generation based on Reynolds, Péclet and skin-depth numbers. Results: The calculated asymmetric currents are used in a real size traction LIM calculation in COMSOL, to derive the performance characteristics for comparison with the results achieved when supplying the LLIM with the symmetric three phase current. Conclusion: These results show that the natural asymmetry of the currents is an important factor that must be considered in appropriately calculating the LIM performance.

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Section: Lim Finite Element Analysismentioning

confidence: 99%

Current mode performance of a traction linear induction motor driven from the voltage converter

Pałka

Woronowicz

2018

Transportation Systems and Technology

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“…Using the method similar with case I, the equivalent circuit under case II can be solved, and two coefficients correcting the secondary resistance and magnetising inductance are expressed in (19) and (20)…”

Section: Case IImentioning

confidence: 99%

An equivalent circuit of the single‐sided linear induction motor considering the discontinuous secondary

Yan

Zeng

et al. 2018

IET Electric Power Applications

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Due to the influence of the switch and rail equipment, the secondary cannot be laid continuously in the linear metro. An equivalent circuit of the single-sided linear induction motor (SLIM) is presented to consider the discontinuity of the secondary plate, and the electromagnetic characteristics of the motor with the discontinuous secondary are obtained. First, the analysis model of the SLIM considering the missing part of the secondary plate is proposed. Second, the variation of the length of the coupled region between the primary and secondary are considered by the method of approximate linearisation to correct the parameters including the primary leakage inductance, magnetising inductance, secondary resistance and secondary leakage inductance. Third, three typical cases of the relative position between the primary and discontinuous secondary are analysed, and the equivalent circuit in each case is deduced according to the distribution of the secondary magnetic motive force and air gap flux density. Then, two coefficients considering the longitudinal end effect, on the basis of the corrected secondary time constant, are proposed to correct the magnetising inductance and secondary resistance. Finally, the analytical results are verified by the results measured on the test rig of an SLIM.

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“…In recent years, the Linear Induction Motor (LIM) is mainly used in transport applications due to their advantages like high efficiency, low cost, less maintenance, and absent of motion converting mechanical equipment [1]. But controlling and modeling of LIM is difficult because its parameters are affected by different time-varying effects like end-effect, a saturation of the core, and Air-gap flux [2]. The design of the closed-loop control drive requires an accurate dynamic model with including all effects, which influences the performance of the LIM.…”

Section: Introductionmentioning

confidence: 99%

An Indirect Matrix Converter Fed Linear Induction Motor Drive by Considering Time-Varying Parameters

Nagaraju¹,

Sukumar²,

Marutheswar³

2020

MMEP

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An indirect matrix converter fed linear induction motor drive by considering timevarying parameters is presented in this paper. The operation and closed-loop control of the LIM is difficult due to its continuous time-varying parameters such as an air gap flux, end effect, saturation, and iron loss. Hence, the accurate mathematical model is required by considering all these effects. In this paper, the LIM is modeled by splitting the flux and current into two components, and the end and saturation effects are also considered. The indirect vector control of SLIM requires the AC to DC and DC to AC with a large capacitor. This large capacitor creates limitations such as the size of the converter increases, the life of converter decreases, and bidirectional power flow is not possible. These limitations are overcome by using direct AC to AC converter is called a matrix converter. In this paper, the indirect matrix converter is used in the indirect vector control technique in place of AC to DC and DC to AC converter. The indirect matrix converter is controlled with space vector modulation. The transient and steadystate performance of LIM, such as Thrust force, velocity, and matrix converter output voltage, input, and output currents, virtual DC link voltage, and Total Harmonics Distraction of currents are verified through using Matlab. The obtained simulation results are verified by an experimental setup with Dspace DS1104 kit.

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A Novel Equivalent Circuit Model of Linear Induction Motors Considering Static and Dynamic End Effects

Cited by 58 publications

References 18 publications

Current mode performance of a traction linear induction motor driven from the voltage converter

Current mode performance of a traction linear induction motor driven from the voltage converter

An equivalent circuit of the single‐sided linear induction motor considering the discontinuous secondary

An Indirect Matrix Converter Fed Linear Induction Motor Drive by Considering Time-Varying Parameters

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