Spin-down Losses and Vibration Analysis of a Flywheel Energy Storage System
(English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073Article in journal (Refereed) Submitted
An integrated flywheel prototype designed to store 868 W h at 30 000 rpm with a novel radial flux core-less electric machine was constructed. The rotor was suspended contactlessly on active radial magnetic bearings and passive axial magnetic bearings. This paper describes the system in detail. The rotor was found to be weakly damped (even at standstill) and the magnetic bearings were used to specifically compensate particular eigenfrequencies. The levitation system was then used to experimentally evaluate the vibrations of the rotor, and compared to FEM studies. Spin-down tests were conducted to evaluate levitation system performance.
flywheel energy storage, spin-down losses, vibrations
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Engineering Science with specialization in Science of Electricity
IdentifiersURN: urn:nbn:se:uu:diva-319522OAI: oai:DiVA.org:uu-319522DiVA: diva2:1087213