Magnetic suspension bearing system for vertical axial disk generator

WANG Jin-mei1, SUN Jing-hong2, LI Guang-hua1, ZHANG Zhen-yi1, ZHU Jun1
（1.School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000,China;
2.Henan Electronic Information Product Quality Supervision and Inspection Institute, Zhengzhou 450002, China）

Abstract: Aiming at the problem of bearing capacity and rigidity of permanent magnet magnetic suspension bearings, the structural unit composition and structural optimization of permanent magnetic suspension bearings were studied.A full suspension permanent magnet bearing system for vertical axis disc motor consisting of two independent suspension units of radial three-ring magnetic suspension bearing and axial magnetic suspension bearing was designed.The multi-objective optimization of the upper axial magnetic ring was carried out by using the Taguchi algorithm. Through the structural comparison, parameter determination and simulation optimization, the design scheme of the radial magnetic suspension bearing and the axial magnetic suspension bearing was analyzed in detail.With the magnetic ring width w, the magnetic ring height h and the magnetic gap g between the magnetic rings as the optimization variables, the bearing capacity and stiffness were optimized, and the effectiveness of the method was verified by simulation modeling.The results indicate that the designed radial magnetic suspension bearing stiffness is improved by 2.4 times, the optimized axial magnetic suspension bearing capacity is increased by 175 N, the stiffness is improved by 1.5 times, the system suspension performance is excellent, the structure is compact, and the parameter design is reasonable.
Key words: magnetic bearing; bearing capacity; stiffness; multi-objective optimization