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

• Published in: IEEE transactions on applied superconductivity 2016-09, Vol.26 (6), p.1-12
• Main Authors: Dianati, Babak, Heydari, Hossein, Afsari, Seyed Ahmadreza
• Format: Article
• Language: English
• Subjects: analytical method; FEM; Gears; high temperature superconductor; High-temperature superconductors; magnetic field; Magnetic fields; Magnetic flux; Partial differential equations; radial flux; Superconducting magnets; superconductive magnetic gear; Torque
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2016.2544832

The basic concept of superconductive magnetic gears (SMGs) is to maximize the benefits and impact of the magnetic gearing technology by highlighting the future perspective of SMGs to produce a more efficient and compact system. This paper deals with a new analytical method (AM) for the calculation of magnetic field distribution in an SMG. A 2-D AM based on Laplace's partial differential equations of magnetic scalar potential in the different subdomains of a magnetic gear is introduced and solved by considering the corresponding boundary conditions. The proposed method shows a significant reduction in the consumed calculation time compared with the finite-element method (FEM) and can be used as a basis for design optimizations. Two-dimensional AM results are compared against those obtained from 2-D FEM simulations, using an accurate, yet efficient, high-temperature superconductor (HTS) modeling, yielded by a detailed localized E{-}J power law approach combining the different aspects of HTS in a numerical method, so as to find out the benefits and validity of the presented AM. Finally, the effects of PMs and pole pieces' dimensions on torque density are realized.