Magnetic‐Geared Electric Variable Transmission Systems

Abstract

A new class of magnetic-geared electric variable transmission (MG EVT) systems has been developed based on contactless magnetic gears, which can offer the definite advantage of brushless and pseudo-gearless power-split operation. This chapter discusses the MG EVT systems for hybrid electric vehicles (HEVs), including the system configurations and multi-port magnetic gears as well as the magnetic planetary-geared (MPG) and magnetic concentric-geared (MCG) types. It presents the corresponding design criteria, design example, and potential applications. For MG EVT application, the magnetic gear should have an input mechanical port coupled with the engine and two output mechanical ports to divert the engine power. There are two kinds of MG EVT systems that have been developed for HEVs, namely the MPG and MCG ones. With the continual development of new PM materials and high-precision manufacturing, this MG EVT system is highly promising for HEVs in the near future.