The influence of inhomogeneous magnetic field over a NdFeB guideway on levitation force of the HTS bulk maglev system

• Published in: Physica. C, Superconductivity Vol. 547; pp. 41 - 45
• Main Authors: Zhao, Lifeng, Deng, Jiangtao, Li, Linbo, Feng, Ning, Wei, Pu, Lei, Wei, Jiang, Jing, Wang, Xiqin, Zhang, Yong, Zhao, Yong
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.04.2018; Elsevier BV
• Subjects: Amplitudes; Decay; Dynamic performance; High temperature; High-temperature superconductor (HTS) maglev; Levitation; Levitation force; Magnetic fields; Magnetic levitation systems; Permanent magnet guideway; Permanent magnets; Superconductors; Dynamic performance; High-temperature superconductor (HTS) maglev; Levitation force; Permanent magnet guideway
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2018.01.003

•A new way to vary the amplitude of magnetic field over permanent guideway is proposed to discuss the effect of inhomogeneous magnetic field distribution of permanent magnet guideway on levitation performance.•The instantaneous levitation force is found to be depended on the variation rate of magnetic field (dB/dt).•The decay of levitation force almost increases linearly with the increase of alternating magnetic field amplitude. Dynamic responses of high temperature superconducting bulk to inhomogeneous magnetic field distribution of permanent magnet guideway, as well as enlarged amplitude of magnetic field obtained by partially covering the permanent magnet guideway (PMG) with iron sheets in different thickness, are investigated. Experiments show that the instantaneous levitation force increases with the increase of the variation rate of magnetic field (dB/dt). Meanwhile, inhomogeneous magnetic field from PMG causes the decay of levitation force. The decay of levitation force almost increases linearly with the increase of alternating magnetic field amplitude. It should be very important for the application of high-speed maglev system.