0
Research Papers

A Uniform Control Method for Imbalance Compensation and Automation Balancing in Active Magnetic Bearing-Rotor Systems

[+] Author and Article Information
Jiang Kejian

 College of Informatics and Electronics, Zhejiang Sci-Tech University, Hangzhou 310018, China e-mail: jkjofzju@163.com

Zhu Changsheng

Tang Ming

tangming_king@163.com College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

J. Dyn. Sys., Meas., Control 134(2), 021006 (Dec 29, 2011) (13 pages) doi:10.1115/1.4005279 History: Received October 09, 2010; Revised July 21, 2011; Published December 29, 2011; Online December 29, 2011

The undesired synchronous vibration due to rotor mass imbalance is a main disturbance source in all rotating machinery including active magnetic bearing (AMB)-rotor systems. In the AMB-rotor system, imbalance compensation, which causes the AMB actuators to spin a rotor about its geometric axis, and automation balancing, which spins a rotor about its inertial axis, are two kinds of common control aim for the rotor imbalance control. In this study, the internal relation between the imbalance compensation and the automation balancing is analyzed and a uniform control method is proposed. With the identical control algorithm, the proposed control method can realize the automation balancing or the imbalance compensation, respectively, by switching the controller’s junction position in the original control loop. The proposed control method does not depend on the dynamic plant model, because its algorithm is based on the real-time identification for the Fourier coefficient of the rotor imbalance disturbance. In this paper, the process of identification algorithm is given in detail and all the possible junction forms of the controller are illustrated. By the simulations, the identification performances of the control algorithm are compared in the conditions with three variable factors, including the signal noise ratio (SNR), the imbalance phase and the identification delay time. The noise level has considerable influence on the identification precision, but the imbalance phase has little. To prolong the identification delay time will be of benefit to improve the identification precision but slow down the identification process. Experiments, which are carried out on an AMB-rigid rotor test rig, indicate that by switching the junction position of the controller in control loop, both kinds of rotor imbalance control can achieve the good effectiveness.

Copyright © 2012 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Principle of rotor-AMB control

Grahic Jump Location
Figure 2

1DOF AMB model with imbalance disturbance

Grahic Jump Location
Figure 3

Unbalance planar rotor

Grahic Jump Location
Figure 4

Controller junction position for automation balancing

Grahic Jump Location
Figure 5

Controller junction position for imbalance compensation

Grahic Jump Location
Figure 6

Simplified control system

Grahic Jump Location
Figure 7

The internal structure of controller

Grahic Jump Location
Figure 8

Identification performance without noise

Grahic Jump Location
Figure 9

Identification performance with SNR = 29.5 dB

Grahic Jump Location
Figure 10

Identification performance with SNR = 23.5 dB

Grahic Jump Location
Figure 11

Identification performance with SNR = 14 dB

Grahic Jump Location
Figure 12

Identification performance with SNR = 9.5 dB

Grahic Jump Location
Figure 13

Identification performance with SNR = 6 dB

Grahic Jump Location
Figure 14

Identification performance with SNR = 3.5 dB

Grahic Jump Location
Figure 15

Identification orbit for the different imbalance phases

Grahic Jump Location
Figure 16

Identification orbit for the different identification delay time

Grahic Jump Location
Figure 17

AMB-rotor system rig

Grahic Jump Location
Figure 18

Rotor motion orbits without imbalance control

Grahic Jump Location
Figure 19

Rotor displacement and power spectrum distribution without imbalance control

Grahic Jump Location
Figure 20

Control current orbits without imbalance control

Grahic Jump Location
Figure 21

Control current and power spectrum distribution without imbalance control

Grahic Jump Location
Figure 22

Rotor motion orbits with imbalance compensation

Grahic Jump Location
Figure 23

Control current orbits with imbalance compensation

Grahic Jump Location
Figure 24

Rotor displacement and power spectrum distribution with imbalance compensation

Grahic Jump Location
Figure 25

Control current orbits with automation balancing

Grahic Jump Location
Figure 26

Rotor motion orbits with automation balancing

Grahic Jump Location
Figure 27

Control current and power spectrum distribution with automation balancing

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In