Cross-Feedback Stabilization of the Digitally Controlled Magnetic Bearing

[+] Author and Article Information
Y. Okada, B. Nagai

School of Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Japan 316

T. Shimane

Semiconductor Div., Toshiba Ltd., 580-1, Horikawa, Kawasaki, Japan 210

J. Vib. Acoust 114(1), 54-59 (Jan 01, 1992) (6 pages) doi:10.1115/1.2930234 History: Received December 01, 1989; Online June 17, 2008


A method of stabilizing a high speed rotor supported by magnetic bearings is presented. The magnetic bearing is controlled by a digital controller with rotationally synchronized interruption. The main problem with the rotating disc is the cross-coupling effect caused by the gyroscopic or inductive forces which sometimes make the high speed rotor unstable. Standard PID control is carried out with constant time interval interruption, while the rotational interrupt subroutine performs the cross-coupling feedback. The cross-feedback in the x-y directions well compensates for the undesirable coupling effect. This scheme is applied to a four-mass, two-bearing rotor system and its capability is tested.

Copyright © 1992 by The American Society of Mechanical Engineers
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