Design of high performance linear feedback laws for operation that extends into the nonlinear region of AMB systems
Xujun LYU
Yefa HU
Huachun WU
Zongli LIN
摘要：Existing active magnetic bearings (AMBs) operate in the linear region of the magnetic material flux density,which limits the utilization of the bearing capacity.In order to increase the utilization of the bearing capacity and enhance the performance of the AMB system,this paper develops a method for designing high performance linear feedback laws.The resulting feedback laws allow the AMB to operate in its nonlinear region and hence improve the closed-loop performance.We first establish an approximate nonlinear AMB current force response model,and place this nonlinear curve inside a sector formed by two piecewise linear lines.Based on the linear line segments in these two piecewise linear lines,we determine the maximum disturbance that can be tolerated by solving an optimization problem with linear matrix inequality (LMI) constraints.For a given level of disturbance under the maximum tolerable disturbance,we formulate and solve the problem of designing the linear feedback that achieves the highest level of disturbance rejection as another LMI problem.Both L2 disturbances and L∞ disturbances are considered.Finally,we illustrate our design by both simulation and experimental results.
机标关键词：piecewise linearbearing capacitylinear matrix inequalitydisturbance rejectionoptimization problemmagnetic materialmagnetic bearingshigh performance
论文发表日期：2017-01-01
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：15( 301-315 )
英文信息