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

Abstract

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.

Performance Analysis of a Linear Motor with HTS Bulk Magnets for Driving a Prototype HTS Maglev Vehicle

“…To investigate the application potential of the HTS maglev, the authors of this paper have developed a prototype vehicle as illustrated schematically in Fig. 1 [5][6][7]. The interaction between the HTS bulks on the movable body and the PM guideways (PMGs) on the ground generates a strong levitation force with passive and self-stabilizing features.…”

“…The attraction force between the mover and the stator is unwanted but unavoidable for the single-sided linear motor. To eliminate this drawback, the double-sided structure of linear motor may be considered [7]. This paper presents the performance analysis and experimental validation of a linear synchronous motor with HTS bulk magnets in an HTS maglev vehicle prototype.…”

Effect of local and global screening current on the current decay in closed-loop HTS coils

“…capacity and excellent high-field properties. These applications include magnetic resonance imaging and nuclear magnetic resonance [1,2], superconducting magnetic levitation [3][4][5], superconducting linear motors [6,7], etc. In practical applications, HTS magnets can be operated in either driven mode or closed-loop persistent mode.…”

Enhancing Performance of Permanent Magnet Motor Drives through Equivalent Circuit Models Considering Core Loss

“…Certainly, various types of electric motors have been developed using cutting-edge electromagnetic materials to achieve low power loss and high power density. Some examples of these materials are very thin electrical steel sheets [9][10][11], high silicon electrical steel sheets [12][13][14], nanocrystalline and amorphous magnetic metals [15][16][17][18][19][20][21], soft magnetic composites [22][23][24][25][26][27][28][29][30][31], and high-temperature superconductors [32][33][34][35][36][37]. Realizing the full potential of these materials hinges upon a comprehensive understanding of their physical properties and their accurate mathematical modeling.…”