Abstract
Determination of an Optimum Fictitious Air Gap and Rotor Disk Thickness for a Coreless AFPMM
Highlights
Axial flux permanent magnet machines (AFPMM) are growing more and more popular lately due to their compactness, a high degree of reliability, efficiency, simple construction and high power density [1,2,3,4,5,6,7]
2 METHODS 2.1 Analytical Determination of Magnetic Flux Density in the Fictitious Air Gap The AFPMM considered in this article is a doublesided AFPMM with two external rotors and one internal coreless stator
The magnetic flux would follow the mean flux path, but in reality, there is the leakage flux, which can be reduced by using measures listed in [16]: - the axial length of the air gap has to be smaller than double thicknesses of the PMs in the magnetization direction (d < 2hPM), - the distance between neighboring PMs on the same disk has to be larger than the fictitious air gap
Summary
Axial flux permanent magnet machines (AFPMM) are growing more and more popular lately due to their compactness, a high degree of reliability, efficiency, simple construction and high power density [1,2,3,4,5,6,7]. All of the above-mentioned topologies can be constructed with or without iron cores (coreless) and with surface mounted or buried PMs. Low power PM machines are usually coreless and have surface mounted PMs [1]. Each machine topology has its own strengths and weaknesses. Topologies without stator cores are used for low and medium power generators and have the advantages, such as absence of cogging torque, linear torque-current characteristics, high power density and compact construction
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