Effective method to control the levitation force and levitation height in a superconducting maglev system*
Yang Peng-Tao, Yang Wan-Min, Wang Miao, Li Jia-Wei, Guo Yu-Xia
       
The magnetic field gradient (d H /d x ) of the four kinds of PMGs along the x direction within the x range from −10 mm to 10 mm.