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http://dx.doi.org/10.3795/KSME-A.2017.41.2.121

Estimation of Center Error in Active Magnetic Bearings through a Pull Test  

Nam, Sunggyu (Dept. of Mechatronics Engineering, Chungnam Nat'l Univ.)
Noh, Myounggyu (Dept. of Mechatronics Engineering, Chungnam Nat'l Univ.)
Park, Young-Woo (Dept. of Mechatronics Engineering, Chungnam Nat'l Univ.)
Lee, Nam Soo (HAE R&D Center, LG Electronics)
Jeong, Jinhee (HAE R&D Center, LG Electronics)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.41, no.2, 2017 , pp. 121-127 More about this Journal
Abstract
From the perspective of commercializing rotating machines equipped with magnetic bearings, maintaining the error between the mechanical center and the magnetic center within an acceptable level is crucial. The existing method of measuring the center error is to adjust the position references that minimize the current imbalance present in levitation control outputs. However, this method can be applied only after all the components of the system are operational. In this paper, we present a new method of estimating the center error by using only the position sensors and a current source. A force model that relates the position of the rotor with the coil currents is set up. Using this model, the center error is estimated by minimizing the difference between the force angles and the contact angles measured in a pull test. The feasibility of the method is numerically and experimentally validated.
Keywords
Active Magnetic Bearings; Center Error; Automatic Test;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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