Ckk Chan

Overview of wireless power transfer for electric vehicle charging

This paper presents an overview of current wireless power transfer (WPT) technologies for the application of electric vehicles (EV) wireless charging. The basic principles of each technology are introduced. Followed by classification, the advantages and limitations of each technology for EV charging are discussed. Promising technologies such as coupled magnetic resonance and magnetic gear technologies are systematically reviewed. The latest development, key technical issues, challenges and state-of-art researches are introduced. The research trends are also been given.

Development of a Singly Fed Mechanical-Offset Machine for Electric Vehicles

A new singly fed mechanical-offset (SF-MO) magnetless machine that can produce the desired torque performances for electric vehicle applications is proposed in this paper. By purposely mismatching the angle between two torque producing segments, the proposed SF-MO machine can well integrate individual torque components to reduce the resultant torque ripple values. Based on the electrical-offset concept, the proposed machine needs only one set of inverter. Therefore, the proposed machine can employ conventional control algorithm to reduce the hardware count of power electronics and to ease control complexity. Various machine performances are analyzed by using finite element method while experimental prototype is also built for verification.

Quantitative comparison of permanent magnet linear machines for ropeless elevator

This paper presents a quantitative comparison of three topologies of double-sided long-stator type permanent magnet linear machines (PMLMs) as possible candidates for the ropeless elevator propulsion system. First, the parameters of each PMLM topology are designed using the same criteria. Then the finite element method (FEM) is employed to evaluate the performance of each topology. Specifically, the translator mass, propulsion forces, detent forces, and no-load EMFs are analyzed and compared. The quantitative comparison results show that the Halbach array PMLM configuration is preferable for the ropeless elevator application because of its small detent force as well as low total mass.