Calculation of eddy current loss for magnetic thrust bearings

Tian, Y-S; Sun, Ying; Yu, Lie

doi:10.1177/1350650111409824

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Under the condition of one-dimensional hypothesis, the stator and the thrust disk just have radial flux component while the air gap and two poles of the stator only have axial flux component. 10 Therefore, the flux of a thrust bearing is divided into six parts shown in Figure 6. The equivalent reluctances for all the divided parts are shown in Table 2.…”

Section: Equivalent Reluctance Models For Mtbmentioning

confidence: 99%

“…Tian et al. 10 presented a less-complicated reluctance model by using the segmentation method without regard to the transition region, and the simplified model is very suitable to analyze the eddy current problems of the MTBs. The results show that, when eddy currents are generated in the bearing, dynamic reluctance would increase, which causes the bandwidth of the displacement and current stiffnesses of MTB to decrease.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic performances of a magnetic thrust bearing based on new soft magnetic composites

Xiao

Hou

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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According to the material theory and analysis method, the characteristics of the soft magnetic composites were analyzed. As the required magnetic properties can be achieved by adjusting the formulation ratio, the high electrical resistivity (about 10−4 Ωm) and decent magnetic properties were obtained. Based on the good performance, soft magnetic composites were firstly applied to the magnetic thrust bearings. The dynamic models including the dynamic stiffnesses, magnetic force based on the effective reluctance model were analyzed. The parameters for soft magnetic composites were obtained by experiments and theoretical calculations. The results showed that the dynamic bandwidth of magnetic force for the bearing with MgO-based soft magnetic composites can reach more than 1000 Hz, which is far beyond that for carbon steel bearing. If the magnetic permeability is further increased to 650, the dynamic bandwidth of the electromagnetic force can also exceed 1000 Hz for the magnetic thrust bearings made by soft magnetic composites. Therefore, the possibility of magnetic thrust bearing made by soft magnetic composites instead of carbon steel materials is equipped with the satisfactory performance, which may provide a theoretical basis and technical support for high-performance magnetic thrust bearing.

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Section: Equivalent Reluctance Models For Mtbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic performances of a magnetic thrust bearing based on new soft magnetic composites

Xiao

Hou

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…As we all know, the power loss is small in HMB because the supporting force is produced by the permanent magnet. [12][13][14] However, the negative displacement stiffness in HMB can cause the instability of the magnetically suspended rotor system. In Wu et al 15 and Yang et al, 16 the relationship between stiffness of control system and structural parameters of AMB is presented.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of permanent magnet biased magnetic bearing based on hybrid factor

Sun

Bai

et al. 2016

Advances in Mechanical Engineering

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In this article, hybrid factor is proposed for hybrid magnetic bearing. The hybrid factor is defined as the ratio of the force produced by the permanent magnet and the forces produced by the permanent magnet and current in hybrid magnetic bearing. It is deduced from a certain radial hybrid magnetic bearing using its important parameters such as the current stiffness and displacement stiffness at first and then the dynamic model of magnetically suspended rotor system is established. The relationship between structural parameters and control system parameters is analyzed based on the hybrid factor. Some influencing factors of hybrid factor in hybrid magnetic bearing, such as the size of the permanent magnet, length of air gap, and area of the stator poles, are analyzed in this article. It can be concluded that larger hybrid factor can be caused by the smaller power loss according to the definition of hybrid factor mentioned above. Meanwhile, the hybrid factor has a maximum value, which is related to control system parameters such as proportional factor expect for structural parameters. Finally, the design steps of parameters of hybrid magnetic bearing can be concluded.

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“…In a finite element mode, the eddy current losses in the windings can be obtained from [175] ( It is expected that the magnetic thrust bearing is the main source of eddy current losses [176].…”

Section: (8-3)mentioning

confidence: 99%

Preliminary Design and Analysis of an Energy Storage Flywheel

Kailasan¹

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Machinery and Controls Laboratory (ROMAC). The technical and social experiences that I have gained under his guidance will last a lifetime. I am thankful to Dr. Timothy Dimond for his fullfledged support and guidance throughout my time in ROMAC. I am especially thankful for his advising and mentoring at a very difficult time. This thesis would have not been made possible without both Prof. Allaire and Dr. Dimond. I would also like to mention my thesis committee Prof. Houston Wood, Prof. George Gillies, Prof. Andre Clarens and Dr. Wei Jiang for providing me with their valuable insights to shape up this thesis. I would like to thank all my colleagues who helped me shape up this thesis. I would like to specially mention Mr. Jason Kaplan for his time in helping me with the ROMAC codes and Mr. Parinya Ananthachaisilp for his enthusiasm and patience in helping me understand the controller design. I shall always be indebted to my family for their constant support and encouragement during this time period. I would like to thank my wife, Subhashini Vel, for being there for me whenever I needed help or a shoulder. I am thankful to my parents, Muthaiyan Kailasan and Thangamani Kailasan, for showing me the right path when in doubt. I would also like to thank my sister, Dr. Kruthikaveni Kailasan, and my brother in law, Dr. Vinodh kumar, for being a pillar of strength and support. Special thanks to my nephew, Vishaal Vinodhkumar, for helping me balance work and play. I would like to end my note by mentioning that my graduate life at ROMAC and UVA has provided me with the necessary tools to succeed in my career and more importantly, to succeed as a human being.

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Calculation of eddy current loss for magnetic thrust bearings

Cited by 5 publications

References 10 publications

Dynamic performances of a magnetic thrust bearing based on new soft magnetic composites

Dynamic performances of a magnetic thrust bearing based on new soft magnetic composites

Analysis and design of permanent magnet biased magnetic bearing based on hybrid factor

Preliminary Design and Analysis of an Energy Storage Flywheel

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