Shin-Etsu Rare Earth Magnets

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Cogging

A phenomenon in which the mechanical attractive force between the armature and the rotor in the motor pulse finely depending on the rotation angle. This is distinguished from rotation torque fluctuation. This occurs because the armature position and shape and the rotor magnetic flux influence each other. When the cogging torque is small, the motor rotates smoothly and highly precise control is possible. With permanent magnet synchronous motors, measures are taken to reduce cogging, such as using tile shaped magnets that are thin at both ends, using skew magnetization, and further skewing the field magnet.

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Glossary list