An Effective Noncontact Torque Mechanism and Design Considerations for an Evershed-Type Superconducting Magnetic Bearing System

Cansız, Ahmet; Yildizer, Irfan; Oral, Emin Argun; Kaya, Yunus

doi:10.1109/tasc.2013.2280033

Cited by 17 publications

(8 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The composite flywheels are designed to carry high speeds as well as rotational stress thresholds compared to steel-based ones [65,66]. Therefore, it is recommended that composite materials are used for high-speed flywheels, and steel is used for low-speed flywheels [67,68]. The main challenge with composite materials, however, is the fact that they are very costly.…”

Section: Components Of Flywheel Energy Storage Systemmentioning

confidence: 99%

“…The induction machine shown in Figure 5 should be considered the best allround choice for high-power installations [73]. They are stoutly constructed, with low build cost, they suit high torque applications, and they are highly reliable [67,74]. They do not suit high-speed applications [75], although doublefed induction machines (DFIM) are in development to overcome this limitation [76,77].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Critical Review of Flywheel Energy Storage System

et al. 2021

View full text Add to dashboard Cite

This review presents a detailed summary of the latest technologies used in flywheel energy storage systems (FESS). This paper covers the types of technologies and systems employed within FESS, the range of materials used in the production of FESS, and the reasons for the use of these materials. Furthermore, this paper provides an overview of the types of uses of FESS, covering vehicles and the transport industry, grid leveling and power storage for domestic and industrial electricity providers, their use in motorsport, and applications for space, satellites, and spacecraft. Different types of machines for flywheel energy storage systems are also discussed. This serves to analyse which implementations reduce the cost of permanent magnet synchronous machines. As well as this, further investigations need to be carried out to determine the ideal temperature range of operation. Induction machines are currently stoutly designed with lower manufacturing cost, making them unsuitable for high-speed operations. Brushless direct current machines, the Homolar machines, and permanent magnet synchronous machines should also be considered for future research activities to improve their performance in a flywheel energy storage system. An active magnetic bearing can also be used alongside mechanical bearings to reduce the control systems’ complications, thereby making the entire system cost-effective.

show abstract

Section: Components Of Flywheel Energy Storage Systemmentioning

confidence: 99%

mentioning

confidence: 99%

Critical Review of Flywheel Energy Storage System

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The main challenge in performing spin-down tests is to engineer a driving system to accelerate and decelerate the levitating PM. Gas jets [10,22], electrical motors [10,[23][24][25], a three-phase handmade brushless motor [26], eddy current clutches [15,23,[27][28][29][30], and magnetic gears [31] have been employed to accelerate the rotating part of superconducting bearings. These methods are associated with complex coupling structures, loss creation, limited maximum speed, and lack of precision when it comes to speed control.…”

Section: Introductionmentioning

confidence: 99%

Design, Build, and Evaluation of an AC Loss Measurement Rig for High-Speed Superconducting Bearings

et al. 2022

View full text Add to dashboard Cite

Friction and heat generated in conventional bearings impose a limit on maximum design speed in electrical machines. Superconducting bearings offer the potential for low loss, simplified, and passively stable bearings that can overcome the speed limit and operate at high loads. Although such bearings are contactless and seem to be loss free, AC loss mainly caused by magnetic field inhomogeneity gradually slows down the rotating body. This loss, whose mechanism has not been fully explored, is measured through spin-down tests where the rotational speed of the spinning rotor is measured as a function of time. However, there are some challenges in performing a reliable spin-down test. In this paper, we discuss these challenges as well as the engineering of an experimental test rig that enables us to spin-up, release, and recapture the levitated permanent magnet. We also discuss the specifications of the driving mechanism including the self-aligning coupling, which accommodates permanent magnets of different sizes. Initial test results at 6600 rpm are discussed and further technical improvements to the test rig suggested. This rig will be used as a key tool to explore the AC loss mechanism and inform the design of bearings for high-speed superconducting machines.

show abstract

“…Economical reasons and energy savings are key issues in industries, especially for those using rotational systems [1,2]. The introduction of magnetic suspension systems using permanent magnets (PMs) helped solving industrial problems in special operating conditions such as aerospace, flywheels and turbomolecular pumps, radiation, vacuum and clean room environments, and equipment for severe conditions, for example, low temperature and rotational speeds over 10,000 rpm [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

An axial passive magnetic bearing using three PM rings

Marignetti

AlizadehTir

Mirimani

2021

IET Electric Power Appl

View full text Add to dashboard Cite

The results of numerical and experimental analysis of passive magnetic bearings are presented. The proposed structure is composed of three radially stacked ring-shaped permanent magnets. The improvements of stiffness and load capacity are proven in comparison to the classical passive magnetic bearing composed of two rings. A preliminary sensitivity analysis is carried out by means of the 2-dimensional finite element method (FEM) modelling, which is used to provide the initial points for the stochastic optimisation and also to define the best fitness and penalty functions. Finally, the 2-dimensional FEM is used to compare the force density and the cost of the proposed structure to those of the classical passive magnetic bearing composed of two rings. The optimised structure was manufactured and validated by experimental measurements. The proposed passive magnetic bearing exerts greater axial force and stiffness than similar structures. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

An Effective Noncontact Torque Mechanism and Design Considerations for an Evershed-Type Superconducting Magnetic Bearing System

Cited by 17 publications

References 20 publications

Critical Review of Flywheel Energy Storage System

Critical Review of Flywheel Energy Storage System

Design, Build, and Evaluation of an AC Loss Measurement Rig for High-Speed Superconducting Bearings

An axial passive magnetic bearing using three PM rings

Contact Info

Product

Resources

About