Design, Fabrication, and Test of a 5-kWh/100-kW Flywheel Energy Storage Utilizing a High-Temperature Superconducting Bearing

Author

Strasik, M. ; Johnson, P.E. ; Day, A.C. ; Mittleider, J. ; Higgins, M.D. ; Edwards, J. ; Schindler, J.R. ; McCrary, K.E. ; McIver, C.R. ; Carlson, D. ; Gonder, J.F. ; Hull, J.R.

Author_Institution

Boeing Co., Seattle

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2133

Lastpage

2137

Abstract

The Boeing team has designed, fabricated, and is currently testing a 5-kWh/100-kW flywheel energy-storage system (FESS) utilizing a high-temperature superconducting (HTS) bearing suspension/damping system. Primary design features include: a robust rotor design utilizing a composite rim combined with a metallic hub to create a 164-kg rotor assembly without critical resonances within the normal operating range, a closed-loop passive HTS bearing suspension/damping system, and a brushless 100-kW motor/generator. The Boeing FESS provides true isolation for the critical load as the 3-phase 480-V AC input power is converted to 600-V DC and re-inverted to clean, 3-phase 480-V AC output power by the inverter power electronics. When fully charged, the system is capable of responding within 4 ms for the uninterruptible protection of critical digital loads. Low losses and stable operation were demonstrated at rotational speeds exceeding 15,000 rpm.

Keywords

brushless machines; electric generators; flywheels; machine bearings; rotors; superconducting devices; suspensions (mechanical components); Boeing team; FESS; brushless motor-generator; closed-loop passive HTS bearing; flywheel energy storage system; high-temperature superconducting bearing; inverter power electronics; mass 164 kg; power 100 kW; rotor design; suspension-damping system; time 4 ms; voltage 480 V; voltage 600 V; Assembly systems; Damping; Energy storage; Fabrication; Flywheels; High temperature superconductors; Resonance; Robustness; Rotors; System testing; Bulk HTS; flywheel energy storage; magnetic levitation;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.898065

Filename

4277737