Improved Incomplete Derivative PID Control of Axial Active Magnetic Bearing

JIANG Qilong; HU Zhenqiu

doi:10.3969/j.issn.0258-2724.2015.02.006

Volume 28 Issue 2

Apr. 2015

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Journal of Southwest Jiaotong University > 2015 > 28(2): 241-246.

JIANG Qilong, HU Zhenqiu. Improved Incomplete Derivative PID Control of Axial Active Magnetic Bearing[J]. Journal of Southwest Jiaotong University, 2015, 28(2): 241-246. doi: 10.3969/j.issn.0258-2724.2015.02.006

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JIANG Qilong, HU Zhenqiu. Improved Incomplete Derivative PID Control of Axial Active Magnetic Bearing[J]. Journal of Southwest Jiaotong University, 2015, 28(2): 241-246. doi: 10.3969/j.issn.0258-2724.2015.02.006

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Improved Incomplete Derivative PID Control of Axial Active Magnetic Bearing

doi: 10.3969/j.issn.0258-2724.2015.02.006

JIANG Qilong^1,2,
HU Zhenqiu^1,2

Received Date: 15 May 2013
Publish Date: 25 Apr 2015

Abstract

Abstract

In order to reduce the interference of measurement noise and improve the steady-state precision of magnetic bearing control, the active magnetic bearing of a vertical motor was adopted to analyze the influence of measurement noise on the traditional PID control. Considering that the incomplete derivative PID controller with the first-order filter and the traditional PID controller cannot meet the requirement in performance of controlling the measurement noises, an improved algorithm for the incomplete derivative PID control with the second-order filter was proposed. A simulation platform was then built in Simulink of MATLAB, and the improved algorithm was verified experimentally on the active magnetic bearing platform using C programming language. Results of simulation and experiments show that the improved algorithm can improve the static performance of the magnetic bearing. Using the incomplete derivative PID controller with the second-order filter, the steady-state error of the air gap of the magnetic bearing was about 20 m, reduced by nearly 50% (i.e., 30 m in magnitude) compared to the traditional PID controller and the incomplete derivative PID controller with the first-order filter. This proves the effectiveness of the improved algorithm.
- magnetic bearing,
- PID controller,
- digital filter,
- stability

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Improved Incomplete Derivative PID Control of Axial Active Magnetic Bearing

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