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We have a drive with tacho for speed feedback. We once found problem in tacho bearing and so changed it with new one. but then found drive started tripping. on checking finally concluded that the tacho feed back was less compared to earlier feed back. People say that when the armature is taken out of permanent magnet field, the magnetism is reduaced and so is the generated voltage.
what are the reasons for this process. How can this magnetism be resumed? Some suggests that while taking armature out, if the two opposite side of magnet is shorted with metallic loop the chances of reducing magnetism is less.
what are the reasons for this process. How can this magnetism be resumed? Some suggests that while taking armature out, if the two opposite side of magnet is shorted with metallic loop the chances of reducing magnetism is less.