Patent ID: 6208053
Filing Date: 2001-03-27
Classification: H02K

Abstract:
A hysteresis slip clutch having an adjustable stall torque comprising:a first rotor and a second rotor;an annular permanent magnet rigidly mounted on said first rotor and an annular hysteresis sleeve rigidly mounted to said second rotor,said first and second rotors mounted such that said magnet and hysteresis sleeve are concentrically located and axially aligned so that magnetic flux from said magnet penetrates said hysteresis sleeve and magnetic hysteresis developed within said hysteresis sleeve opposes relative angular motion between said first and second rotors;said second rotor comprising a concave support member and a first annular sidewall defining a first cylindrical space within said concave support member adapted at its distal end to support the hysteresis sleeve in a manner allowing said first rotor to be partially inserted into said concave support member to a point where the permanent magnet is in axial alignment with the hysteresis sleeve and a second annular sidewall formed by said concave support member defining a second cylindrical space;an internal shaft extension formed on said first rotor, insertable into said second cylindrical space;support bearings disposed between said internal shaft extension and the second annular sidewall, said support bearings allowing said first rotor to rotate freely relative to said second rotor; andan annular magnetic shunt adjustably mounted relative to hysteresis sleeve and permanent magnet, said shunt being movable between a first position remote from said hysteresis sleeve and magnet wherein said magnetic flux is substantially unaffected by said shunt, and a second position wherein a substantial amount of magnetic flux is diverted from said hysteresis sleeve to said shunt.