Encoder made of rubber material and method of manufacturing thereof

摘要

A method of manufacturing an encoder comprises mixing unvulcanized rubber with a magnetic powder, in order to form a rubber compound. The rubber compound is then extruded or rolled to form a sheet having a predetermined thickness. A ring is cut from the sheet and hot-pressed and moulded using vulcanization in order to reduce its thickness to an amount that is from 1/5 to 2/3 of the predetermined thickness of the sheet. S-poles and N-poles are subsequently magnetised onto the ring in a configuration in which the S-poles and N-poles alternate in a circumferential direction of the ring.