This is a special magnetic ring for magnetic encoder, the material is injection molded ferrite, the surface has a raised structure, the outer diameter is 34.1mm, the hole is 18mm, the total thickness is 3mm, single side multi-pole magnetization (62 and 64 poles)....
The product you see now is a thin flat ring magnet with more than 100 poles, 128 poles in the outer ring (64 N poles, 64 S poles), 126 poles in the inner ring, belongs to the double code channel multi-pole magnetic ring, the material is rubber magnet, so the magnetism is not strong, the surface magnetic strength is only a few hundred gauss....