关键词: 磁悬浮永磁发电机, 被动永磁轴承, 磁力, 优化设计

Abstract: The maglev high-speed permanent magnet generator is the core component of the ultra-low temperature waste heat power generation device, and its bearing system structure and parameters are related to the generator ' s performance. Taking the passive permanent magnet bearing as the research object, the structural form of the bearing system and passive magnetic bearings of the waste heat generator and the suspension principle of the passive magnetic bearings were briefly introduced. A magnetic force calculation model and a stiffness calculation model of passive permanent magnet bearings were established. The global optimum design parameters of the passive magnetic bearing were obtained through orthogonal experiments, namely, the global optimum radial thickness d of the magnetic poles was 7. 5 mm, the pitch of the magnetic poles was 15 mm, the center radius R of the gap was 100 mm, the axial length L was 150 mm, the radial gap g was 3 mm, the radial rigidity K was 3 000 N / mm. The above bearing system structure and parameters are applied to a waste heat power generation system. The actual operation results showed that the fault shutdown rate was reduced by 52. 94%, the displacement of rotor under rated operation was reduced by 0. 09 mm, and the temperature of the passive magnetic bearing was reduced by 10 ℃ .

Key words: magnetic levitation permanent magnet generator, passive permanent magnet bearing, magnetism, optimized design