Eddy current sensor for a rotary shaft and rotary shaft apparatus

An eddy current sensor for a rotary shaft, comprising:

• a housing;
• one or more position detecting probes provided on the housing;
• a rotating speed detecting probe provided on the housing;
• and
• a filler element filling interstices within the housing to form a solid annular cylindrical body, such that the position detecting probes and the rotating speed detecting probe are plastically sealed together with the housing;
• wherein the housing comprises:
• an inner ring portion, a center of which forms a central hole for the rotary shaft to pass through;
• a middle portion connected to an exterior wall of the inner ring portion and extending outwardly;
• an outer ring portion connected to an end away from the inner ring of the middle portion and forming a recessed structure with the inner ring portion and the middle portion;
• wherein the position detecting probes being provided on the inner ring portion and/or the middle portion, the rotating speed detecting probe being provided on the inner ring portion or the outer ring portion.