scholarly journals Analysis of output precision characteristics of digital switching power amplifier in the active magnetic bearings system

Automatika ◽  
2017 ◽  
Vol 58 (2) ◽  
pp. 205-215 ◽  
Author(s):  
Xin Cheng ◽  
Lin Zhang ◽  
Rougang Zhou ◽  
Shao Song ◽  
Bo Wang ◽  
...  
Keyword(s):  
Power Amplifier ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Switching Power ◽  
Digital Switching

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.

scholarly journals Evaluation of Switching Power Amplifier Topology for Active Magnetic Bearings

Actuators ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 131
Author(s):  
Kezhen Yang ◽  
Yefa Hu ◽  
Xinhua Guo ◽  
Jian Zhou ◽  
Huachun Wu
Keyword(s):  
Power Amplifier ◽  
Power Amplifiers ◽  
Rotating Machinery ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Current Output ◽  
Switching Power ◽  
Output Performance ◽  
Three Phase ◽  
Volume Current

Active magnetic bearings (AMBs) have led to great progress in the field of rotating machinery due to their many advantages, such as their non-contact and non-lubrication properties. As the key component of an AMB actuator, the switching power amplifier has an important impact on the performance of magnetic bearings and rotating machinery. In this paper, the topologies of switching power amplifiers for AMBs are introduced. The traditional half-bridge topology and two newly proposed topologies—the three-phase-half-bridge and neutralized-sharing-bridge topology—are analyzed and discussed. The volume, current output performance and cost of the power amplifier with different topologies are comprehensively evaluated, providing a theoretical basis and guidance for the selection and design of the topology of switching power amplifiers for AMBs under different conditions.

A Generalized Nonlinear Model for Active Magnetic Bearings

1995 ◽  
Author(s):  
Jianmin Gao ◽  
Xiaomei Zhu ◽  
Ray McCafferty ◽  
Nigel Leighton
Keyword(s):  
Power Amplifier ◽  
Nonlinear Model ◽  
Arbitrary Number ◽  
Magnetic Bearing ◽  
Experimental Results ◽  
Magnetic Bearings ◽  
Pd Controller ◽  
Active Magnetic Bearings ◽  
Bearing Material ◽  
Generalized Nonlinear Model

Abstract This paper describes a generalized nonlinear model of active magnetic bearings, for arbitrary number, size and position of pole-pairs, including the coordinate coupling between the vertical and horizontal directions, the nonlinearility of the power amplifier and the effect of finite permeability of the ferromagnetic bearing material. As an example, a practical magnetic bearing with four pole-pairs is examined. The predicted force from the model is quite consistent with experimental results. For the PD controller implemented for a horizontal rotor, the expectation of the equilibrium of the rotor also agrees quite well with the measurement.

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