DESIGN AND MODELLING OF NOVEL FLYWHEEL ENERGY STORAGE SYSTEM SUPPORTED BY MAGNETIC BEARINGS


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Elpeze G., Göker E. M. , Bozkurt A. F. , Erkan K.

6th INTERNATIONAL CONFERENCE ON ADVANCES IN MECHANICAL ENGINEERING, İstanbul, Turkey, 20 - 22 November 2021, vol.1, pp.460-469

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.460-469

Abstract

Nowadays, the rapid decrease in fossil fuel resources required for electricity production in response to the

increasing electricity demand has started to create serious imbalances between supply and demand. In order to continue

energy production and have a sustainable environment, renewable energy sources appear as one of the most rational

solutions. Flywheel energy storage systems are one of these products. Active magnetic bearing systems have started to

be used in many sectors such as aviation, transportation robot systems, and the manufacturing industry. In this study,

a high level of an energy storage system using magnetic bearings to minimize energy consumption was proposed.

Magnetic bearing systems have highly non-linear characteristics and are inherently unstable. Because of those, they

require closed-loop controllers for stable operation. 4-pole hybrid electromagnets are used for levitation in the vertical

direction (z-axis) and 8-pole electromagnets are used for the radial directions (x, y-axes). Radial Magnetic bearings

(RMB) are designed and modeled for the developed 6 DoF system. The upper and lower RMBs of the system were

controlled separately (decentralized control). The air gap I-PD controllers for the vertical axis, which converges

excitation current to nearly zero because of permanent magnets, and for radial axes have been designed and simulation

results were given.