Tri-state overrunning clutch

The invention provides a three-state overrunning clutch which comprises an outer circle, an inner circle, a plurality of wedge blocks positioned between the outer circle and the inner circle, and an outer holding rack and an inner holding rack positioned between the outer circle and the inner circle and holding the plurality of wedge blocks. A plurality of arc grooves are formed on the working face of the outer circle and each arc groove is matched with a working face of the corresponding wedge block and holds the working face inside the arc groove; the inner holding rack is provided with a plurality of protruding plates axially extending outwards, and each protruding plate is provided with oblique holes inclined relative to the axial direction. An axial sliding poke tray is arranged on the outer circumference of the outer circle, wherein a plurality of poke rods, which are respectively inserted into the corresponding oblique holes, are fixed on the poke tray. Through the electromagnetic driving mechanism, th