Abstract
This paper presents a flux-modulated direct drive (FMDD) motor. The key is to integrate the magnetic gear with the PM motor while removing the gear inner-rotor. Hence, the proposed FMDD motor can achieve the low-speed high-torque output and high-speed compact design requirements as well as high-torque density with a simple structure. The output power equation is analytically derived. By using finite element analysis (FEA), the static characteristics of the proposed motor are obtained. Based on these characteristics, the system mathematical model can be established. Hence, the evaluation of system performances is conducted by computer simulation using the Matlab/Simulink. A prototype is designed and built for experimentation. Experimental results are given to verify the theoretical analysis and simulation.
Highlights
To improve the fuel economy and reduce the emissions in the transportation areas, electric vehicles (EVs) and hybrid electric vehicles (HEVs) are the most viable solution [1]
The other is the inwheel motor driving; especially the PM in-wheel motors have been paid much attention, which have the advantages of simple structure and high efficiency
There are two types of PM in-wheel motors; one is the outer-rotor topology without gear; another is the inner-rotor one in which a planetary gear is employed. The former can provide the low-speed operation directly, but it causes big size and heavy weight. The latter has the advantages of reduced size and weight, but the planetary gear has the defects such as lubrication, transmission loss, and acoustic noise [3]
Summary
To improve the fuel economy and reduce the emissions in the transportation areas, electric vehicles (EVs) and hybrid electric vehicles (HEVs) are the most viable solution [1]. The magnetic gear has some distinct advantages when compared to mechanical gears: no mechanical fatigue; no lubrication; overload protected; no contact losses; no transmission contact acoustic noise; high efficiency (only a little core loss and bearing loss); and high torque per volume ratio (ten times the standard motors) [5]. When such a magnetic gear is coupled with a conventional PM motor, the overall torque density can be significantly improved.
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