TY - JOUR
T1 - Progress of superconducting bearing technologies for flywheel energy storage systems
AU - Koshizuka, N.
AU - Ishikawa, F.
AU - Nasu, H.
AU - Murakami, M.
AU - Matsunaga, K.
AU - Saito, S.
AU - Saito, O.
AU - Nakamura, Y.
AU - Yamamoto, H.
AU - Takahata, R.
AU - Itoh, Y.
AU - Ikezawa, H.
AU - Tomita, M.
N1 - Funding Information:
We would like to thank K. Matsui (IHI), R. Yabuno, T. Oka (IMRA), H. Kameno (Koyo Seiko), K. Demachi (U. Tokyo), K. Miya (U. Keio), M. Tomita, N. Yamachi, T. Horigami, K. Nakazato, M. Anjyu and S. Tanaka (ISTEC) for discussions and contribution to the Project. This work is supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Superconducting Bearing Technologies for Flywheel Energy Storage System.
PY - 2003/4/15
Y1 - 2003/4/15
N2 - We report present status of NEDO project on "Superconducting bearing technologies for flywheel energy storage systems". We fabricated a superconducting magnetic bearing module consisting of a stator of resin impregnated YBaCuO bulks and a rotor of NdFeB permanent magnet circuits. We obtained levitation force density of 8 N/cm2 at 81 K and rotation loss per levitation force of 3 mW/N at 77 K. We confirmed that both pre-loading and excess cooling methods are effective for suppressing gradual fall of rotor due to flux creep. We designed a 10 kWh class flywheel energy storage test system and investigated feasibility of active magnetic bearings for controlling rotation axis vibration under high speed rotation of the flywheel.
AB - We report present status of NEDO project on "Superconducting bearing technologies for flywheel energy storage systems". We fabricated a superconducting magnetic bearing module consisting of a stator of resin impregnated YBaCuO bulks and a rotor of NdFeB permanent magnet circuits. We obtained levitation force density of 8 N/cm2 at 81 K and rotation loss per levitation force of 3 mW/N at 77 K. We confirmed that both pre-loading and excess cooling methods are effective for suppressing gradual fall of rotor due to flux creep. We designed a 10 kWh class flywheel energy storage test system and investigated feasibility of active magnetic bearings for controlling rotation axis vibration under high speed rotation of the flywheel.
KW - Active magnetic bearing
KW - Flywheel energy storage system
KW - Levitation force
KW - Rotation loss
KW - Superconducting magnetic bearing
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U2 - 10.1016/S0921-4534(02)02206-2
DO - 10.1016/S0921-4534(02)02206-2
M3 - Conference article
AN - SCOPUS:0037445737
VL - 386
SP - 444
EP - 450
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
T2 - ICMC 2002
Y2 - 16 June 2002 through 20 June 2002
ER -