HTS Magnet for Maglev Applications (1)— Coil Characteristics

When a strong on-board magnet is moved relative to a conducting sheet, a circulating eddy current will be induced in the conductor. The eddy current in turn produces a magnetic field, which by Lorentz force law, produces repulsive forces between the two magnetic fields. An experimental study on the electrodynamic suspension system was carried with a 1.5 m diameter rotary type test wheel. Two types of on board magnets are tested. One is a HTSC magnet and the other one is a Halbach-arrayed permanent magnet. The Lorentz forces of the two EDS systems are measured and compared with theoretical and numerical calculations.Index Terms-Electrodynamic suspension systems, Halbach arrayed permanent magnets, HTSC magnets.

Section: Calculation Of Levitation and Drag Forcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Electrodynamic Suspension System With HTSC and PM Halbach Array Magnets

Cho

Bae

Sung

et al. 2008

“…S EMI-PERSISTENT current mode operation with a high temperature superconducting (HTS) coil can be used in some applications [1]- [5]. For example, a maglev with an HTS magnet is charged once and is operated for one day [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Current Charge and Discharge Characteristics of a Small-Scale Turn-to-Turn Soldered HTS Coil

Lee

Song

et al. 2015

A semipersistent current-mode operation with a high-temperature superconducting (HTS) coil is very useful for some applications, including maglev. An HTS coil for semipersistent mode operation includes at least one residual joint to make a closed-loop coil. A low current decaying rate is achieved by reducing the residual joint resistance. This paper suggests a winding method with a turn-to-turn soldering process. The turn-to-turn soldering process provides a wide flow path for the charged current in the HTS coil during the semipersistent mode operation. Therefore, the total equivalent residual resistance is reduced. However, this reduced residual resistance also prevents the current from participating in the charging process. Therefore, a new current charging method for the turn-to-turn soldered HTS coil needs to be tested. In this paper, a small-scale sample HTS coil with turn-to-turn soldering method is fabricated for testing. A simple charging-discharging experiment is performed on the sample coil. The time constant of the sample coil is calculated from the experimental results. A fast current charging sequence for the turn-to-turn soldered coil is also tested and analyzed from the perspective of power and energy consumption during the current charging operation.Index Terms-Charge and discharge, semipersistent, turn-toturn soldered.

“…1) Electrodynamic (repulsion) suspension using HTS coil magnets [16]- [18], where the auxiliary support system should be used to support the suspension body when the system stays stationary or has a speed smaller than a critical value; 2) Electromagnetic (attraction) suspension using HTS coil magnets [23], [24], which needs a feedback signal to regulate the suspension height in real time; 3) HTS bulk-PM magnetic suspension (repulsion) using field-cooled (FC) HTS bulks on the mover and PM guideways (PMGs) as the track [25]- [27], which has the capabilities of self-levitation and self-guidance without using any feedback control. When an HTS linear motor is integrated with an HTS magnetic suspension subsystem, the linear motor can run without sliding friction and will have both advantages of applying HTS materials to the linear motion drive and the magnetic suspension.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Superconducting Linear Synchronous Motors Integrated With HTS Magnetic Levitation Components

Jin

Zheng

Guo

et al. 2012

High-temperature superconductors (HTSs) including HTS bulks and tapes have potential applications in linear motion drive and magnetic levitation/suspension systems generating substantial advantages over conventional ones. When an HTS linear motor is integrated with an HTS magnetic suspension subsystem, it can inherit both merits of HTS linear motion drive and HTS magnetic suspension simultaneously and can be applied into various fields, such as the maglev and electromagnetic aircraft launch systems (EMALSs). Based on different HTS aspects and arrangements, three modes of HTS linear synchronous motor (HTSLSM) integrated with HTS magnetic suspension subsystems have been proposed in this paper. To verify the modes for the design of a practical HTSLSM, the structural features of these systems are described, the magnetization characteristics to obtain HTS bulk magnets, the trapped-field attenuation characteristics of the HTS bulk magnet exposed to external traveling field, and the magnetic field distribution characteristics for different permanent-magnet guideways have been studied with experimental verification. Based on the study, a demonstration prototype of a single-sided HTSLSM integrated with HTS magnetic suspension subsystems has been developed. Its performance and thrust characteristics have been obtained by experimental measurements and compared with theoretical results. With regard to practical applications, two modes of double-sided HTSLSM integrated with HTS magnetic suspension subsystems have been designed for the maglev and EMALS, respectively, and then, the 2-D finiteelement-analysis models for the HTSLSMs were built to analyze their performance characteristics. The comprehensive simulations and experimental results constitute a framework for the structural and electromagnetic design of the HTSLSM integrated with HTS magnetic suspension for practical applications.