Application of superconducting magnetic bearings to a 10 kWh-class flywheel energy storage system

Author

Ichihara, Takumi ; Matsunaga, Koji ; Kita, Makoto ; Hirabayashi, Izumi ; Isono, Masayuki ; Hirose, Makoto ; Yoshii, Keiji ; Kurihara, Kazuaki ; Saito, Osamu ; Saito, Shinobu ; Murakami, Masato ; Takabayashi, Hirohumi ; Natsumeda, Mitsutoshi ; Koshizuka, N

Author_Institution

Supercond. Res. Lab., Tokyo, Japan

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

2245

Lastpage

2248

Abstract

Radial type superconducting magnetic bearings have been developed for a 10 kWh-class flywheel energy storage system. The bearings consist of an inner-cylindrical stator of YBCO bulk superconductors and an outer-rotor of permanent magnets. The rotor is suspended without contact via the pinning forces of the bulk superconductors that are arranged such that the c-axis of each superconductor is aligned parallel to the radial direction of the cylinder. In this paper, we describe the implementation of the stator part and report the SMB test results, namely that the rotor was successfully rotated at up to 7,500 rpm. Thus we succeeded in energy storage of 2.24 kWh.

Keywords

flywheels; magnetic bearings; permanent magnets; rotors; superconducting devices; superconducting magnet energy storage; SMB test; YBCO bulk superconductors; flywheel energy storage system; inner-cylindrical stator; outer-rotor; permanent magnets; pinning forces; radial type superconducting magnetic bearings; Circuit testing; Energy storage; Flywheels; Magnetic levitation; Mechanical bearings; Stators; Superconducting magnets; Superconductivity; System testing; Yttrium barium copper oxide; Flywheel energy storage system; YBCO bulk superconductors; pinning force; radial type superconducting magnetic bearings;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.849622

Filename

1440112