Adaptive compensation of sensor run-out and mass unbalance in magnetic bearing systems without changing rotor speed
US6763285B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2001 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Mar 31, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C32/0451
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method and system for stabilizing a rotor about its geometric center in a magnetic bearing system at a constant rotor speed. In the method, the controller for controlling the magnetic bearing uses an adaptive control algorithm which simultaneously identifies and compensates for synchronous sensor runout and rotor mass unbalance while determining a control action that drives the rotor rotating at a constant speed to its geometric center. The identification of sensor runout and mass unbalance is by varying the magnetic stiffness which is achieved by perturbation of the bias currents in opposing electromagnet coils in a manner that does not alter the equilibrium of the rotor while it is rotating at a constant speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.