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Research Papers

Design of Magnetic Bearing Control System Based on Active Disturbance Rejection Theory

[+] Author and Article Information
Chaowu Jin

College of Mechanical and
Electrical Engineering,
Nanjing University of
Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: jinchaowu@nuaa.edu.cn

Kaixuan Guo

College of Mechanical and
Electrical Engineering,
Nanjing University of
Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: 13770575122@163.com

Yuanping Xu

College of Mechanical and
Electrical Engineering,
Nanjing University of
Aeronautics and Astronautics,
Nanjing 210016, China;
Laboratory of Robotic Systems,
Ecole Polytechnique Federale Lausanne (EPFL),
Lausanne 1015, Switzerland
e-mail: ypxu@nuaa.edu.cn

Hengbin Cui

College of Mechanical and
Electrical Engineering,
Nanjing University of
Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: cuihengbin1993@foxmail.com

Longxiang Xu

College of Mechanical and
Electrical Engineering,
Nanjing University of
Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: fqp@nuaa.edu.cn

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received November 15, 2017; final manuscript received July 3, 2018; published online August 13, 2018. Assoc. Editor: Patrick S. Keogh.

J. Vib. Acoust 141(1), 011009 (Aug 13, 2018) (9 pages) Paper No: VIB-17-1497; doi: 10.1115/1.4040837 History: Received November 15, 2017; Revised July 03, 2018

At present, most of the magnetic bearing system adopts the classical proportional–integral–derivative (PID) control strategy. However, the external disturbances, system parameter perturbations, and many other uncertain disturbances result in PID controller difficult to achieve high performance. To solve this problem, a linear active disturbance rejection controller (LADRC) based on active disturbance rejection controller (ADRC) theory was designed for magnetic bearing. According to the actual prototype parameters, the simulation model was built in matlab/simulink. The step and sinusoidal disturbances with PID and LADRC control strategies were simulated and compared. Then, the experiments of step and sinusoidal disturbances were performed. When control parameters are consistent, the experiment showed that the rotor displacement fluctuation decreased by 28.6% using the LADRC than PID control under step disturbances and decreased by around 25.8% under sinusoidal disturbances. When the rotor is running at 24,000 r/min and 27,000 r/min, the displacement of rotor is reduced by around 15% and 13.7%, respectively. Rotate the rotor with step disturbances and sinusoidal disturbances. It can also be seen that LADRC has the advantages of fast response time and good anti-interference. The experiments indicate that the LADRC has better anti-interference performance compared with PID controller.

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Figures

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Fig. 1

Structure of AMB system

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Fig. 3

Control system structure of ADRC

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Fig. 2

Block diagram of magnetic bearing control system

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Fig. 4

The simulation model of magnetic bearing control system based on LADRC

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Fig. 5

Simulations under step disturbance

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Fig. 6

The rotor displacement under sinusoidal disturbance of 150 Hz

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Fig. 9

Displacement waveform of rotor radial freedom under sine disturbance of 150 Hz: (a) rotor displacement under PID and (b) rotor displacement under LADRC

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Fig. 10

Rotor displacement waveform at the speed of 24,000 r/min: (a) rotor displacement waveform under PID and (b) rotor displacement waveform under LADRC

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Fig. 11

Rotor displacement waveform at the speed of 27,000 r/min: (a) rotor displacement waveform under PID and (b) rotor displacement waveform under LADRC

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Fig. 7

Magnetic bearing test rig: 1. Computer; 2. Oscilloscope; 3. Control system; 4. Signal generator; 5. NI data acquisition card; 6. Frequency converter; and 7. AMB rotor test rig

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Fig. 8

Displacement curve of rotor under sudden impulse disturbance: (a) rotor displacement under PID and (b) rotor displacement under LADRC

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Fig. 12

Rotor displacement waveform at the speed of 24,000 r/min with step disturbance: (a) rotor displacement waveform under PID and (b) rotor displacement waveform under LADRC

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Fig. 13

Rotor displacement waveform at the speed of 27,000 r/min with step disturbance: (a) rotor displacement waveform under PID and (b) rotor displacement waveform under LADRC

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Fig. 14

Rotor displacement waveform at the speed of 24,000 r/min with sine disturbance: (a) rotor displacement waveform under PID and (b) rotor displacement waveform under LADRC

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Fig. 15

Rotor displacement waveform at the speed of 27,000 r/min with sine disturbance: (a) rotor displacement waveform under PID and (b) rotor displacement waveform under LADRC

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