Affiliations: [a] School of Mechanical Engineering, Shenyang University of Technology, Economic & Technological Development Zone, Shenyang, Liaoning, China | [b] Department of Intelligent Mechanical Systems Engineering, Kochi University of Technology, Tosayamada, Kami city, Kochi, Japan
Correspondence:
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Corresponding anthor: Zhenyun Duan, School of Mechanical Engineering, Shenyang University of Technology, Economic & Technological Development Zone, No. 111 Shenliao West Road, Shenyang 110870, Liaoning, China. Tel.: +86 13604045543; E-mail:13604045543@139.com
Abstract: The parallel permanent magnetic suspension system using
flux-path control is composed of a servo motor, a radially magnetized disk
magnet, and a pair of magnetizers. Establishing an accurate mathematical
model is difficult owing to the system's special structure and nonlinear
characteristics. To acquire an accurate mathematical model, an
autoregressive exogenous (ARX) model identification method is applied to the
system. First, the system input and output data are acquired from the
suspension experiment. Then, an ARX model is established utilizing the data
from the system identification method. Lastly, the relevant simulations and
experiments are carried out to verify the validity of the ARX model. The
results show that the simulation data with the ARX model closely agree with
the test data obtained from the same controller. This model identification
method can provide a better way to acquire a more accurate mathematical
model for improving the controller.
Keywords: Permanent magnetic suspension, model identification, ARX model
