箔片-电磁混合轴承的稳态承载特性及控制

箔片-电磁混合轴承(HFMB)是一种将气体箔片轴承和电磁轴承混合使用的新型轴承,有效解决了气体箔片轴承低速磨损大和电磁轴承承载力有限的不足,并且具备载荷可分配和支撑系统动力学性能可调节等优点.文中在分析两种轴承稳态承载特性的基础上详细讨论了混合轴承的稳态控制方法,给出了一种以电磁轴承实际承载力与预分配承载力差值最小为控制目标,通过等边三角形为基本单元对混合轴承工作区域进行划分的箔片-电磁混合轴承稳态工作位置搜索算法.最后建立了系统模型并进行了数值仿真,验证了稳态控制系统的可行性和有效性.

Steady State Bearing Behavior and Control of Hybrid Foil-Magnetic Bearings

A hybrid foil-magnetic bearing (HFMB) is a combination of the foil bearing and the magnetic bearing, which takes advantage of the strengths of each individual bearing while minimizing each others weaknesses. It is the solution of the coating abrasion problem of foil bearings at low speeds and limited capacity problem of magnetic bearings, meanwhile, load sharing and dynamic characteristics adjusting can be achieved in a HFMB. In this paper, the steady-state characteristics of a HFMB were analyzed. Then a steady-state controller was designed and a searching algorithm was presented to determine the steady-state working position of the HFMB. The searching algorithm which used the equilateral triangle to divide the working plane of the HFMB minimized the deviation between actual force and the predetermined sharing load of the magnetic bearing. Finally, simulations were performed to verify the performances of the steady-stare control system. The results show that the steady-state control was feasible and reliable.