A 0.5 kWh flywheel energy storage system using a high-T/sub c/ superconducting magnetic bearing

Author

Miyagawa, Y. ; Kameno, H. ; Takahata, R. ; Ueyama, H.

Author_Institution

Koyo Seiko Co. Ltd., Osaka, Japan

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

996

Lastpage

999

Abstract

A flywheel rotor having a main shaft, two flywheel disks and one permanent magnet for a SMB (superconducting magnetic bearing) was designed and manufactured. The flywheel was made of CFRP material which is light weight and has high tensile strength. The permanent magnet was hooped by CPRP in order to prevent centrifugal bursting. The rotor was levitated by a SMB in the axial direction. The radial vibration of the rotor was damped by active magnetic bearings. The superconducting magnetic bearing was made of YBa/sub 2/Cu/sub 3/O/sub 7-X/ which had a strong pinning force. The whole rotor system was stably accelerated up to 30000 rpm by an induction motor in a vacuum chamber, and then its energy storage value reached 479 Wh. In this paper, the rotor design, bearing and rotational properties of the rotor are discussed.

Keywords

barium compounds; carbon fibre reinforced plastics; flywheels; high-temperature superconductors; magnetic bearings; permanent magnets; rotors; superconducting devices; yttrium compounds; 0.5 kWh; 479 Wh; CFRP material; YBa/sub 2/Cu/sub 3/O/sub 7-X/; YBa/sub 2/Cu/sub 3/O/sub 7/; active magnetic bearings; axial direction; centrifugal bursting prevention; flywheel disks; flywheel energy storage system; flywheel rotor; high tensile strength; high-T/sub c/ superconducting magnetic bearing; induction motor; permanent magnet; pinning force; rotor design; rotor levitation; rotor radial vibration damping; vacuum chamber; Energy storage; Flywheels; Magnetic levitation; Magnetic materials; Manufacturing; Permanent magnets; Rotors; Shafts; Superconducting magnets; Superconducting materials;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783466

Filename

783466