Analytical Computation of Air-Gap Magnetic Field in a Viable Superconductive Magnetic Gear

Abstract. Two simulation methods, Equivalent-Circuit Model (ECM) simulation and Finite Element Method (FEM) simulation, are proposed for analyzing the time evolution of the shielding current density in a High-Temperature Superconducting (HTS) film that is part of a pellet container moving in an applied magnetic field. In the ECM simulation, Newton's equation of motion for the pellet container is solved together with the circuit equations equivalent to the governing equation of the shielding current density in the HTS film. On the other hand, it is solved together with the governing equation in the FEM simulation. Two numerical codes are developed on the basis of the ECM/FEM and the performance of the Superconducting Linear Acceleration (SLA) system is investigated by using the two codes. The results of computations show that, even for the case with a single electromagnet, the SLA system has a possibility to accelerate a pellet container up to over 140 m/s.

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“…After taking the inner product of both sides in (13) with ϕ i (r) and, subsequently, substituting (12) into the resulting equation, we get…”

Section: Resultsmentioning

confidence: 99%

Comparison between FEM and Equivalent-Circuit Model Simulations of Superconducting Linear Acceleration System for Pellet Injection

Yamaguchi

Takayama

Saitoh

et al. 2017

JASSE

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“…where the function E( j) characterizes the electromagnetic behavior of HTS films. As the function E( j), we assume the following power law [2][3][4][7][8][9][10]:…”

Section: Shielding Current Analysis Of Cracked Hts Film 21 Initial-mentioning

confidence: 99%

Convergence-property improvement of GMRES in shielding current analysis of cracked high-temperature superconducting film

Kamitani

Takayama

Saitoh

et al. 2018

JASSE

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A high-performance method is proposed for solving a linear system in the shielding current analysis of a cracked high-temperature superconducting film. After discretized with respect to time and space, the initial-boundary-value problem of the shielding current density reduces to a linear system at each iteration cycle of the Newton method. Although the linear system can be easily solved with GMRES, both crack length and the number of cracks affect convergence property significantly. In order to improve convergence property of GMRES, other variables than corrections of the current vector potential are all eliminated from the linear system. As a result, convergence property of GMRES is hardly influenced by either crack length or the number of cracks.

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“…Among the different structures of radial flux (coaxial) [24], linear [25], transverse flux [26], arcuate [27], and axial flux, the axial flux (AFMG) structure has been more widely considered [28][29][30]. This is due to the isolation of the input and output shafts, providing the possibility of oscillation of the axes relative to each other, and lower occupation of the axial space.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design and Analysis of a Novel Reluctance Axial Flux Magnetic Gear

Kashani

Ahmadreza²

2020

Scientia Iranica

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This paper proposes modelling and optimization of a new reluctance axial flux magnetic gear (RAMG) with stationary outer rotor and advantages of lower permanent magnet usage. Due to the less use of the PMs, this structure has a higher economic interest, more reliability, and very simple and robust structure than its conventional ones. Gear ratio and operating principles are extracted and verificated using 3-D finite element method (FEM) simulations. Finally, a parametric optimization is done based on effective dimensions in design procedure with maximum torque density objective function. The magnetic flux distributions of optimized RAMG are calculated by 3-D FEM, as well as static and dynamic magnetic torques are derived correspondingly.

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Analytical Computation of Air-Gap Magnetic Field in a Viable Superconductive Magnetic Gear

Cited by 31 publications

References 26 publications

Comparison between FEM and Equivalent-Circuit Model Simulations of Superconducting Linear Acceleration System for Pellet Injection

Comparison between FEM and Equivalent-Circuit Model Simulations of Superconducting Linear Acceleration System for Pellet Injection

Convergence-property improvement of GMRES in shielding current analysis of cracked high-temperature superconducting film

Optimal Design and Analysis of a Novel Reluctance Axial Flux Magnetic Gear

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