Shin-Etsu Rare Earth Magnets

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Radial magnets

Cylinder anisotropic magnets whose easy magnetization axis direction is the radial direction. For radial anisotropy, the number of magnetic poles and the magnetization pattern of the magnet can be adjusted with the way the magnetization is performed and the cogging torque etc. can be adjusted through multi-pole and skew magnetization. Also, assembly in a motor rotor is generally easy, reducing motor manufacturing costs. However, from the perspective of magnet manufacture, the processes for manufacturing radial magnets are complex and the production efficiency and yield are poor, which raises costs. Also, in motor rotors, even at the changeover points between magnetic poles, in other words at the sections where magnetic flux is not generated, magnetic material is used, so compared to manufacture using segment magnets, the weight of magnets used is greater, which increases costs.

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Glossary list