Scheduled System Maintenance:
On Monday, April 27th, IEEE Xplore will undergo scheduled maintenance from 1:00 PM - 3:00 PM ET (17:00 - 19:00 UTC). No interruption in service is anticipated.
By Topic

Feedback linearisation of magnetic bearing actuators for a uniform upper bound of force slew rate

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Li, L. ; Dept. of Mech. Eng., Xi''an Jiaotong Univ., China ; Mao, J.

In a single-axis active magnetic bearing (AMB) actuator a one-degree-of-freedom moving mass is driven by the tractive forces of two electromagnets, since only one electromagnet is not capable of providing a driving force of changeable sign. The displacement of the moving mass is thus controlled by two current inputs to the two electromagnets. Usually a constraint is imposed on the two inputs to maintain a single input in effect. Such a constraint is also required when this nonlinear plant is linearised with the feedback linearisation (FBL) technique. However, there are infinitely many such constraints that can yield the same linearised plant, and with some of them the linearised plant is prone to be nonlinear. In the paper, two constraints for FBL are derived based on the internal physics of the plant. The first constraint is for minimum copper loss and the second is for a uniform upper bound of force slew rate. Experiment and simulation show that with the first constraint the feedback linearised plant appears to be less linear than the original plant, where the validity of the FBL algorithm is found to be sensitive to sensor noise, while with the second constraint the linearised plant does become more linear

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:146 ,  Issue: 4 )