General-purpose controller for multiple types of magnetic bearing rotor systems

• Published in: Energy reports 2023-03, Vol.9, p.345-354
• Main Authors: Xu, Cheng, Zhao, Feng, Xu, Guxuan, Lian, Guangkun
• Format: Article
• Language: English
• Subjects: Displacement conditioning; Generality; Linear active disturbance rejection control; Magnetic bearing; Power amplifier
• ISSN: 2352-4847; 2352-4847
• DOI: 10.1016/j.egyr.2022.10.423

With the increasingly widespread application of magnetic bearings (MBs) in high-speed motors, turbomachinery, and machine tools, the development of magnetic bearing controllers (MBCs) is becoming increasingly significant. Conventional MBCs are designed specifically for a particular type of MB and have poor generality. Given this, an MBC with a digital signal processor (TMS320F28377S) as the core is developed. Meanwhile, a generality calculation method for the circuit module is proposed. The displacement conditioning circuit designed in this paper can match most MB displacement sensors, and the generality is improved to 91.66%. The designed power amplifier can realize the switching of two-level and three-level pulse width modulation (PWM). It can also realize the switching of unidirectional and bidirectional power amplifier control. Therefore, it can apply to most MB rotor systems, and the generality is improved to 66.67%. In addition, the proposed dual closed-loop control strategy based on linear active disturbance rejection control (LADRC) makes the system’s anti-interference capability, robustness and self-adaptive capability enhanced, further improving the generality of the controller. Simulation and experimental results show that the MBC is highly general and has good dynamic performance, and the electrical control system of the MB is optimized.