Abstract
Many practical problems in magnetic bearing control concern essentially the minimization (maximization) of the dynamic compliance (stiffness) of the rotor. In this paper, the problem of minimizing the peak compliance of a high speed machining (HSM) spindle's thrust axis is examined. Experimental results are presented which demonstrate that μ synthesis provides an excellent tool for tackling this problem. Both complex μ and mixed μ synthesis are used to design controllers. The performance of the μ controllers is compared to that of an optimized PID controller. Under μ control, the dynamic stiffness of the system was increased by more than a factor of two over that obtained with the optimal PID controller. Careful attention was given to developing an accurate system model and uncertainty description, especially related to the transfer function of the magnetic actuators with solid stators and thrust disk.
Original language | English |
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Pages (from-to) | 19-51 |
Number of pages | 33 |
Journal | Machining Science and Technology |
Volume | 7 |
Issue number | 1 |
DOIs | |
State | Published - 2003 |
Bibliographical note
Funding Information:This work was supported by Cincinnati Milacron, Inc. The authors would like to thank Dr. Stephen Fedigan for assistance with the digital controller.
Funding
This work was supported by Cincinnati Milacron, Inc. The authors would like to thank Dr. Stephen Fedigan for assistance with the digital controller.
Funders | Funder number |
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Cincinnati Milacron, Inc. |
Keywords
- Bearing
- Controls
- High speed machining
- Magnetics
- Spindle
ASJC Scopus subject areas
- General Materials Science
- Mechanical Engineering
- Industrial and Manufacturing Engineering