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Magnetic gear has eddy current loss due to permanent magnets (PMs) unlike the mechanical gear. The eddy current loss becomes a main cause of decrease of gear efficiency. Therefore, this paper presented the eddy current loss reduction design of the PMs in the magnetic gear. The eddy current loss is calculated using a non-linear finite element method (FEM) based on 3-D numerical analysis and the effect...
Magnetic gears have the advantages of high efficiency and high reliability. The idea that magnetic gears might solve the physical contact problem of mechanical gears has drawn considerable research attention. However, magnetic gears are disadvantageous for implementing high gear ratios because the gear ratio is defined by a combination of the number of pole pairs of the inner rotor and the outer rotor...
The mechanical gear, which is used in many fields of modern industry, is used primarily in power transmitting mechanical devices. Magnetic gears, which solve the physical contact problem of mechanical gears, have drawn much attention. The magnetic gear has many advantages such as no mechanical friction loss, very little noise and vibration, and no need for lubricant. Because of these unique noncontact...
Magnetic gear which is capable of non-contact transfer torque has replaced mechanical gear and has advantages of high-efficiency and improved reliability. However, the magnetic gear has eddy current loss due to magnets unlike the mechanical gear. In addition, the magnetic gear has ferromagnetic pole pieces between two rotors. When kinds of steel use stainless (SUS) materials which have high strength...
A magnetic gear that is capable of noncontact torque transmission has replaced mechanical gear, and has advantages of high efficiency and improved reliability. However, it also has the problem of a low torque density, which requires improvement. In this paper, a novel pole piece shape is proposed in order to improve the problem of low torque density of the magnetic gear. In order to identify the functional...
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