Study on performance of multi-secondary movable loosely coupled transformer for contactless power transfer system

Contactless power transfer (CPT) system is widely used in high power recently. The characteristics of contactless transformer in CPT system have powerful influences to the performance of whole system. This paper studies the performance on movable loosely coupled transformer (MLCT) for CPT system, which can be used in rail transit system. Making use of 3D finite element methods, this paper investigates the factors influencing on the output voltage stability, including the longitudinal displacement, the air gap and the rotation angle around different axis. The results of such studies verify that a reasonable structural design of multi-secondary partly contributes to improve voltage stability.