Analysis of electromagnetic forces in a levitated short rotor LIM. II. Lateral stabilization

Venkataratnam, K.; Chattopadhyay, Adhir Baran

doi:10.1109/60.986445

Cited by 9 publications

(11 citation statements)

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“…Its attenuation constant is 1/α 1 and end-effect half-wave length is τ e . b 2 travels along the x-axis in the negative direction with an attenuation constant of 1/α 2 [10].…”

Section: IImentioning

confidence: 99%

“…Most parameter definitions from (1) to (10) are given in the appendix. In (2), the flux density b y includes three parts: b 0 , b 1 and b 2 .…”

Section: IImentioning

confidence: 99%

“…The power factor curves. the primary phase current and phase voltage were recorded using a power analyzer [10]. The simulation and experimental results for the thrust, power factor, and efficiency are given in Figs.…”

Section: Simulation and Experimentationmentioning

confidence: 99%

“…THE PHYSICAL MODEL To simplify the analysis, some assumptions are used [6][7][8][9][10][11][12]: (a) the stator iron has infinite permeability; (b) skin effect is neglected in the secondary; (c) winding space harmonics are negligible; and (d) the primary and secondary currents flow in infinitesimally thin sheets. The structure and one-dimensional representation of the SLIM are shown in Fig.…”

Section: IImentioning

confidence: 99%

“…b 0 is the normal traveling wave which moves forward in a similar manner to the fundamental flux density wave in a rotating induction machine (RIM). b 1 and b 2 are determined from the boundary conditions, which are the entrance and exit end-effect waves [9][10][11]. b 1 is a gradually attenuating wave traveling along the x-axis.…”

Section: IImentioning

confidence: 99%

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An improved series equivalent circuit of a single-sided linear induction motor

Zhu

Zhang

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

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The derivation of the equivalent circuit for a singlesided linear induction motor (SLIM) is not straightforward. Especially if it includes longitudinal end effects from the cutopen primary magnetic path, transverse 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. The transverse edge effects accounted for with a correction coefficient K t and an air-gap flux density correction coefficient K b . Using the series circuit, the performance of the SLIM was assessed in a similar manner to a rotating induction machine. A 4 kW SLIM prototype was tested which validated the simulation technique.

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“…Its attenuation constant is 1/α 1 and end-effect half-wave length is τ e . b 2 travels along the x-axis in the negative direction with an attenuation constant of 1/α 2 [10].…”

Section: IImentioning

confidence: 99%

“…Most parameter definitions from (1) to (10) are given in the appendix. In (2), the flux density b y includes three parts: b 0 , b 1 and b 2 .…”

Section: IImentioning

confidence: 99%

Section: Simulation and Experimentationmentioning

confidence: 99%

Section: IImentioning

confidence: 99%

Section: IImentioning

confidence: 99%

See 3 more Smart Citations

An improved series equivalent circuit of a single-sided linear induction motor

Zhu

Zhang

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

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Analysis of electromagnetic forces in a levitated short rotor LIM. I. Finite length and finite width effects

Venkataratnam

Chattopadhyay

2002

IEEE Trans. On Energy Conversion

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The paper proposes a partly analytical and partly numerical method for evaluating the propulsion, levitation and lateral destabilizing forces in a levitated short rotor linear induction motor (LIM) considering the finite width of the stator and finite width and length of the rotor. The calculated forces at unity slip are compared with experimental results on a laboratory size model built for this purpose. Constructional details of the levitated LIM (LLIM) are also given. Method of lateral stabilization and its analysis are considered in Part II of the paper.

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Prospects and Challenges of the Hyperloop Transportation System: A Systematic Technology Review

Nøland

2021

IEEE Access

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The present article outlines the core technologies needed to realize the Hyperloop transportation system (HTS). Currently, the HTS vacuum tube train concept is viewed as the fastest way to cross the earth's surface. However, the concept has not yet been demonstrated for subsonic or near-sonic speeds in large-scale implementations. Among the challenging technical areas are the tube's depressurization, the capsule's air resistance, and choked flows occurring around the capsule. There is also a need for effective levitation and propulsion solutions compatible with the velocities being proposed. Moreover, several conflicting objectives have been identified in the HTS design. It is highlighted that the tubes should be wide enough to lower the capsule's drag forces but that a large-sized tube comes at the expense of higher operational energy costs and infrastructure investments. Another struggle is aiming at a low-cost passive track design and, and at the same time, a lightweight vehicle. One technical path is to turn the whole guideway into an electric propulsor, arriving at a 'lightweight capsule solution' (LCS). Alternatively, the vehicle could be transformed into a 'modified airplane' that stores massive amounts of onboard energy, yielding an energy-autonomous 'low infrastructure solution' (LIS). In a case study, it is shown that even LIS technology is compatible with short-haul flights (1500 km) but that it requires an energy reservoir of about 30 % of the capsule's overall mass. Results and discussions presented in this paper are supported by analytical predictions with parameters or input data either supported by referred simulations or experiments. In general, the paper aims to open up the discussion, provide a sufficient understanding of the Hyperloop field's multidisciplinary aspects, and establish a foundation for further investigations. In the end, new research tasks have been defined, which have the potential to go beyond the state of current knowledge.

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Analysis of electromagnetic forces in a levitated short rotor LIM. II. Lateral stabilization

Cited by 9 publications

References 1 publication

An improved series equivalent circuit of a single-sided linear induction motor

An improved series equivalent circuit of a single-sided linear induction motor

Analysis of electromagnetic forces in a levitated short rotor LIM. I. Finite length and finite width effects

Prospects and Challenges of the Hyperloop Transportation System: A Systematic Technology Review

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