A Study on Optimal Operating Point of Linear Induction Motor Considering Normal Force and Efficiency in MAGLEV Vehicle

Lim, Jaewon; Park, Doh-Young; Jeong, Jong Seob

doi:10.1109/tmag.2018.2846767

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…The normal force of traditional motors has been studied for many years. These researches are of great significance for improving the stability of motor (Kim et al , 2014; Lim et al , 2018; Lu et al , 2013), and the research results are critical references to the normal force research of 2DOFM. However, there is still an obvious difference between the normal force research on the traditional motor and 2DOFM, which is that two motion units (rotary motion unit and linear motion unit) of a 2DOFM always interact with each other.…”

Section: Introductionmentioning

confidence: 99%

Normal force calculation of two-degree-of-freedom direct drive induction motor considering coupling effect

Nie

Meng

Wang

et al. 2023

COMPEL

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Purpose The purpose of this study is to calculate the normal force of a two degree of freedom direct drive induction motor considering coupling effects based on an analytical model. Compared with the traditional single degree of freedom motor, normal force characteristics of two-degree-of-freedom direct drive induction motor (2DOFDDIM) is affected by coupling effect when the machine is in a helical motion. To theoretically explain the influence mechanism of coupling effect, this paper conducts a quantitative analysis of the influence of coupling effect on normal force based on the established analytical model of normal force considering coupling effect. Design/methodology/approach Firstly, the normal forces generated by 2DOFDDIM in linear motion, rotary motion and helical motion are investigated and compared to prove the effect of the coupling effect on the normal force. During this study, several coupling factors are established to modify the calculation equations of the normal force. Then, based on the multilayer theoretical method and Maxwell stress method, a novel normal force calculation model of 2DOFDDIM is established taking the coupling effect into account, which can easily calculate the normal force of 2DOFDDIM under different motions conditions. Finally, the calculation results are verified by the results of 3D finite element model, which proves the correctness of the established calculating model. Findings The coupling effect produced by the helical motion of 2DOFDDIM affects the normal force. Originality/value In this paper, the analytical model of the normal force of 2DOFDDIM considering the coupling effect is established, which provides a fast calculation for the design of the motor.

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Section: Introductionmentioning

confidence: 99%

Normal force calculation of two-degree-of-freedom direct drive induction motor considering coupling effect

Nie

Meng

Wang

et al. 2023

COMPEL

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“…The products of experimental display the features of dynamic are dissimilar between the lateral 5803 and vertical orientations. They got results to help an insight to the vehicle of composite magnetic levitation employed PML, SML and establish argument of the optimization and promotion Lim, et al, [4], they presented the characteristics of electromagnetic for an induction motor in nonlinear properties for MagLev in high speed. The magnetic levitation train impetus system supplies exceptional ride standard, but has drawback in the aptitude of propulsion is little owing to its intrinsic properties.…”

Section: Introductionmentioning

confidence: 99%

Model predictive control of magnetic levitation system

Alkurawy

Mohammed

2020

IJECE

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In this work, we suggest a technique of controller design that applied to systems based on nonlinear. We inform the sufficient conditions for the stability of closed loop system. The asymptotic stability of equilibrium and the nonlinear controller can be applied to improvement the stability of Magnetic Levitation system(MagLev). The MagLev nonlinear nodel can be obtained by state equation based on Lagrange function and Model Predictive Control has been used for MagLev system.

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“…However, due to the dynamic longitudinal end effect, with the increase of speed, the performance curve of slip frequency and thrust of the short primary LIM moved to the right, which would lead to the motor not working at the maximum output thrust point, resulting in low system efficiency. In this regard, many scholars had proposed improvement strategies [14][15][16][17][18][19]. As the speed increases, the equivalent excitation inductance decreases and the secondary flux linkage decreases.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al [16] dynamically adjusted the reference current of the d ‐axis and q ‐axis to make the LIM output peak thrust. On the premise of not reducing the performance of rail transit suspension system, Lim et al [17] proposed variable slip frequency operation mode to improve propulsion efficiency. In order to reduce the driving loss of the LIM, Hu et al [18] proposed a control scheme based on the loss model to minimise the loss of the LIM.…”

Section: Introductionmentioning

confidence: 99%

Improved vector control strategy of linear induction motors for electromagnetic launch

Han

Rui

et al. 2020

IET power electron.

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Due to the change of parameters caused by the dynamic longitudinal end effect, the operation characteristics of linear induction motors (LIMs) applied in an electromagnetic launch field are different from that of ordinary LIM. Due to the continuous increase of the LIM port voltage under high acceleration, the phase voltage is close to the inverter output limit. The conventional indirect field-oriented control (IFOC) strategies of LIM based on the flux attenuation compensation or maximum thrust control cannot solve the problem well. Based on the LIM mathematical model, this study analyses the output thrust characteristics of the LIM and discusses different control methods. This study presents an improved vector control strategy. By dynamically adjusting the value of 'k' based on the moving speed of the LIM, the maximum thrust output is maintained at medium and low speeds, and the voltage rise of a motor port is restrained at high speed. The effectiveness of the proposed control method is verified by simulation and experiment. The method proposed in this study is helpful to broaden the application of the LIM in the higher speed field.

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A Study on Optimal Operating Point of Linear Induction Motor Considering Normal Force and Efficiency in MAGLEV Vehicle

Cited by 12 publications

References 5 publications

Normal force calculation of two-degree-of-freedom direct drive induction motor considering coupling effect

Normal force calculation of two-degree-of-freedom direct drive induction motor considering coupling effect

Model predictive control of magnetic levitation system

Improved vector control strategy of linear induction motors for electromagnetic launch

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