Self‐sensing active magnetic bearings with zero‐bias‐current control

2008 ◽  
Vol 165 (2) ◽  
pp. 69-76 ◽  
Author(s):  
Yuki Kato ◽  
Toshiya Yoshida ◽  
Katsumi Ohniwa
Keyword(s):  
Bias Current ◽  
Current Control ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Zero Bias

scholarly journals Self-Sensing Active Magnetic Bearings with Zero-Bias-Current Control

2006 ◽  
Vol 126 (10) ◽  
pp. 1399-1405 ◽  
Author(s):  
Yuki Kato ◽  
Toshiya Yoshida ◽  
Katsumi Ohniwa
Keyword(s):  
Bias Current ◽  
Current Control ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Zero Bias

scholarly journals Evaluation of the Topology of Switching Power Amplifiers for Active Magnetic Bearings

Proceedings ◽  
2020 ◽  
Vol 64 (1) ◽  
pp. 25
Author(s):  
Yefa Hu ◽  
Kezhen Yang ◽  
Xinhua Guo ◽  
Jian Zhou ◽  
Huachun Wu
Keyword(s):  
Power Amplifier ◽  
Power Amplifiers ◽  
Comprehensive Evaluation ◽  
Magnetic Bearing ◽  
Bias Current ◽  
Magnetic Bearings ◽  
Active Magnetic Bearing ◽  
Active Magnetic Bearings ◽  
Switching Power ◽  
Bearing System

A switching power amplifier is a key component of the actuator of an active magnetic bearing, and its reliability has an important impact on the performance of a magnetic bearing system. This paper analyzes the topologies of a switching power amplifier of an active magnetic bearing. In the case of different coil pair arrangements and bias current distributions, comprehensive evaluation of the different topologies of switching power amplifiers is introduced. This evaluation has a guiding role in the design of a switching power amplifier of an active magnetic bearing.

Nonlinear Low Bias Current Control for Magnetic Bearing System Using Active Disturbance Rejection Technology

2021 ◽  
Author(s):  
Yichen Yao ◽  
Yixin Su ◽  
Suyuan Yu
Keyword(s):  
Control Strategy ◽  
Disturbance Rejection ◽  
Control Method ◽  
System Modeling ◽  
Magnetic Bearing ◽  
Bias Current ◽  
Current Control ◽  
Zero Bias ◽  
Active Disturbance Rejection ◽  
Bearing System

Abstract Magnetic bearing is widely used in helium-turbine circle of the high temperature gas-cooled reactor and many other highspeed rotating machinery because of its unique advantages in vibration and noise reduction. However, the power consumption of magnetic bearing increases its cost of use. Moreover, the design of magnetic bearing controller relies on accurate system modeling. All these restrict the industrial application of magnetic bearings. Based on the structure of the eight-pole magnetic bearing and its corresponding traditional decentralized differential PID control strategy, this paper proposes a magnetic bearing control framework including expected bearing force realization control strategy and centralized control strategy. Under this framework, a nonlinear low bias current control method for magnetic bearing system is given. Afterwards, an active disturbance rejection controller based on low(zero) bias current is proposed to compensate the gyroscopic disturbance and modeling uncertainty of the system. The controller can keep small loss of magnetic bearing and have good stability. It has a frame of active disturbance rejection control (ADRC) and its compensation performance is analyzed. In order to verify the effectiveness of the controller, a corresponding experimental verification is carried out on the test rig. The results show that the control strategy is effective.

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