A Novel Flywheel Energy Storage System With Partially-Self-Bearing Flywheel-Rotor

Author

Zhang, Chi ; Tseng, King Jet

Author_Institution

Nanyang Technol. Univ., Singapore

Volume

22

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

477

Lastpage

487

Abstract

A compact and efficient flywheel energy storage system is proposed in this paper. The system is assisted by integrated mechanical and magnetic bearings, the flywheel acts as the rotor of the drive system and is sandwiched between two disk type stators to save space. The combined use of active magnetic bearings, mechanical bearings and axial flux permanent magnet (PM) synchronous machine assists the rotor-flywheel to spin and remain in magnetic levitation in the vertical orientation, while constrains the other four degrees of freedom in radial directions mechanically. The mathematical model of the proposed system has been derived. Three-dimensional finite element method (3D FEM) is applied for studying the performances and verifying the mathematical model of the system. The analysis results support the feasibility of the system.

Keywords

finite element analysis; flywheels; machine bearings; magnetic bearings; magnetic levitation; motor drives; permanent magnet machines; rotors; stators; 3D finite element method; FEM; axial flux permanent magnet synchronous machines; drive systems; flywheel energy storage system; integrated mechanical-magnetic bearings; magnetic levitation; mathematical model; partially-self-bearing flywheel rotors; Drives; Energy storage; Finite element methods; Flywheels; Magnetic levitation; Mathematical model; Mechanical bearings; Permanent magnets; Stators; Synchronous machines; Axial flux permanent magnet (AFPM) motor; flywheel energy storage system (FESS); partially self bearing motor; three-dimensional finite element method (3D FEM) analysis;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/TEC.2005.858088

Filename

4207482