Recent developments and comparative study of magnetically geared machines

Abstract

This paper overviews the recent developments and various topologies of magnetically geared (MGd) machines. Particularly, current design trends and research hotspots of this kind of MGd machines are emphasized, with the aid of statistic summary of the published papers. According to different evolutions from a magnetic gear (MG), four mainstreams of MGd machines are extracted and compared in terms of both mechanical complexity and electromagnetic performance. By virtue of their inherent features, such as high torque density and multi-power port, the feasibility of MGd machines for applications, where continuously variable transmission (CVT) and power split are demanded, is also described.

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“…(1) (2) where P is the number of pole pairs; Ns is the number of FMP-Ps, and , is the harmonic frequency. When ( = 1& = −1), this corresponds to the useful flux modulation and torque transducing case.…”

“…There are some other super and sub harmonics that do not contribute to torque transducing but tend to generate iron losses and torque ripple. For better torque transmission, the number of FMP-Ps should equal the sum of the pole-pairs of the low-speed rotor (LSR) and highspeed rotor (HSR) as indicated in (2). Moreover, since all the three rotors are able to rotate, we can have three different gear ratios by making one of them stationary and let the other two rotors rotate as shown in (3), The torque equation assuming no loss operation is given by (4):…”