Title :
Design of a High-Speed Superconducting Bearingless Machine for Flywheel Energy Storage Systems
Author :
Wenlong Li ; Chau, K.T. ; Ching, T.W. ; Wang, Yannan ; Mu Chen
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong, China
Abstract :
In this paper, an 8-pole/12-slot high-speed superconducting bearingless machine is proposed for flywheel energy storage systems. The proposed machine adopts a homopolar configuration: the rotor only consists of iron lamination with eight salient iron poles and the 12-slot stator accommodates all three groups of windings: the high temperature superconducting (HTS) field winding; the armature winding; and the suspension winding. With the HTS field winding, eight iron poles in the rotor are magnetized as 4-pole-pair electromagnets. Also, by adjusting the dc current in the HTS field winding, the air-gap flux can be controlled flexibly. By deploying the suspension winding which shares the same slot with the armature winding, a two-degree-of-freedom suspension force can be generated for bearingless operation.
Keywords :
flywheels; high-temperature superconductors; homopolar machines; machine bearings; rotors; stators; superconducting machines; 12-slot stator; 4-pole-pair electromagnets; HTS field winding; air-gap flux; armature winding; flywheel energy storage systems; high temperature superconducting field winding; high-speed superconducting bearingless machine; homopolar configuration; iron lamination; rotor; salient iron poles; suspension winding; two-degree-of-freedom suspension force; High-temperature superconductors; Iron; Rotors; Stator windings; Suspensions; Windings; Bearingless machine; Superconducting machine; bearingless machine; energy storage; flywheel; homopolar machine; superconducting machine;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2014.2367008
