scholarly journals Permanent magnet thrust bearings for flywheel energy storage systems: Analytical, numerical, and experimental comparisons

2019 ◽  
Vol 233 (15) ◽  
pp. 5280-5293
Author(s):  
Nikolaj A Dagnaes-Hansen ◽  
Ilmar F Santos
Keyword(s):  
Energy Storage ◽  
Permanent Magnet ◽  
Storage Systems ◽  
Magnetic Suspension ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Flywheel Energy Storage ◽  
Energy Storage Systems ◽  
Thrust Bearings ◽  
Stiffness And Damping

A new type of flywheel energy storage system uses a magnetic suspension where the axial load is provided solely by permanent magnets, whereas active magnetic bearings are only used for radial stabilization. This means that the permanent magnet bearing must provide all the axial damping. Furthermore, it must have as low a negative radial stiffness as possible to reduce the workload on the radial active magnetic bearings. Many different mathematical models for determining force, stiffness, and damping of permanent magnet bearings are available in the literature. This work will further develop the most applicable analytical and numerical methods in order to make them directly implementable for designing permanent magnet thrust bearings for flywheel energy storage systems. The outcome is a fast and efficient method for determining force, stiffness, and damping when the bearing setup contains magnetic materials with relative permeability higher than one as well as when it does not. The developed method is validated against numerical and experimental results with good agreement.

scholarly journals Critical Review of Flywheel Energy Storage System

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2159
Author(s):  
A.G. Olabi ◽  
Tabbi Wilberforce ◽  
Mohammad Ali Abdelkareem ◽  
Mohamad Ramadan
Keyword(s):  
Energy Storage ◽  
Permanent Magnet ◽  
Storage Systems ◽  
Storage System ◽  
Energy Storage System ◽  
Synchronous Machines ◽  
Flywheel Energy Storage ◽  
Permanent Magnet Synchronous Machines ◽  
Energy Storage Systems ◽  
Flywheel Energy Storage System

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.

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