Design of hybrid thrust Magnetic bearing for heavy rotating shaft considering self-weight compensation according to axial load

Ahn, Ji Hoon; Han, Congying; Kim, Choonsig; Park, C.; Choi, Jang-Young

doi:10.1109/intmag.2017.8007919

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…According to the number of controlled degrees of freedom imposed by a magnetic bearing on the suspended rotor, it can be divided into single-degree-of-freedom (1 DOF) [38],two-degree-offreedom (2 DOF) and 3 DOF magnetic bearings. The 1 DOF magnetic bearing is a constraint on the axial degree of freedom of the rotor; the 2 DOF magnetic bearing is a constraint on the radial direction of the rotor; Different combinations of the above types can form 4 DOF and 5 DOF magnetic bearing systems.…”

Section: Degrees Of Freedommentioning

confidence: 99%

Magnetic Bearing: Structure, Model and Control strategy

Huang,

Li,

Zhou

et al. 2023

Preprint

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Bearings are crucial transmission components that offer support to mechanical rotating bodies. Nevertheless, traditional bearing failure due to friction and wear more easily. In scenarios involving ultra-high speeds and extreme applications, minimizing bearing losses and enhancing performance becomes especially vital. Magnetic bearings, characterized by zero friction, no need for lubrication, and high-speed capabilities, offer a viable solution to the issue of bearing failure attributed to friction. However, there is currently a shortage of comprehensive review literature that delves into the structural attributes, modeling mechanisms, and control strategies of magnetic bearings. This article will perform a comprehensive literature review on magnetic bearings, addressing the aforementioned aspects and discussing their core technologies. Firstly, from the perspective of classification and magnetic circuit structure analysis, the properties and characteristics of various magnetic bearings are discussed. Secondly, the working principle and performance of mathematical models of magnetic bearings with different structures are described, and the modeling steps and optimization schemes are summarized. Furthermore, the influence of control strategy of magnetic bearing on the control performance of magnetic bearing is summarized. Compared to PID control, modern control theory has achieved a performance improvement of nearly 50% in terms of improved position accuracy and adjustment time. Finally, the current research progress on magnetic bearings is summarized, and the current bottleneck issues are anticipated. This review contributes to a deeper understanding of the action mechanism and control method of magnetic levitation bearing, thus promoting the progress of magnetic levitation bearing technology.

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Section: Degrees Of Freedommentioning

confidence: 99%

Magnetic Bearing: Structure, Model and Control strategy

Huang,

Li,

Zhou

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Magnetic bearing has the advantages of being oil-free and frictionless [1], and is widely used in compressors [2,3], blowers [4,5], molecular pumps [6], flywheel energy storage [7,8], electric spindles [9] and other fields. However, when a power failure occurs in practical applications, the high-speed rotor will lose its electromagnetic force support and fall directly, thus triggering a violent collision, which will cause fatal damage to the rotor and bearings and affect the reliability of the whole system.…”

Section: Introductionmentioning

confidence: 99%

Study on abnormal power failure shutdown control of magnetic suspension centrifugal compressor

Guo

et al. 2022

IET Electric Power Appl

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The rotor of a magnetic suspension centrifugal compressor is supported by magnetic bearing, and a power failure will cause the high‐speed rotor to fall directly onto the protective bearings, affecting the reliability of the compressor. To solve this problem, this paper proposes an abnormal power failure shutdown control method with semi‐switching modulation of the inverter. Firstly, the overall scheme of abnormal power failure shutdown control is designed, and its feasibility is analysed in detail through mathematical modelling. Secondly, aiming at the non‐linear, time‐varying and gain uncertainty characteristics of the control system, a voltage control strategy based on parametric self‐regulating sliding‐mode variable structure is proposed, and the stability is analysed. Finally, the method proposed in this paper is experimentally verified, the results show that this method does not depend on the electric angle of the motor compared to existing methods, and the rotor can achieve a zero‐drop speed shutdown, which greatly improves the reliability of the magnetic suspension centrifugal compressor.

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