부산대학교 도서관

This article presents a new type of axial active–passive suspension electromagnetic system for the maglev pump. In industrial applications, the variable residual axial hydraulic force on the impeller may lead to collision and vibration, which need to be compensated. In this article, a new type of electromagnetic system is constructed with the advantage of providing both active and passive axial force. The designed active magnetic support can generate the axial force on the diameter magnetized rotor in both positive and negative directions, but it only occupies a small space in the radial air gap. It is proven by theoretical derivation that the generated active axial force will not change with the rotation angle of the rotor. Besides, its control algorithm is also proposed. We designed, simulated, and built a prototype, and tested it through the control experiment. And the active force is almost unaffected in the test during rotation and speed step. The prototype system achieves maximum controllable axial force of $\pm$2.0 N (0.67 N/A), which effectively enhances the axial stiffness. The damping factor of active suspension is 70 times higher than that of passive suspension, which can successfully suppress axial vibration.