The utility model discloses a smooth rotor structure of generator motor is disclosed, to form by centre ring, the son that trackslips, insulating measuring device, backing plate, sliding ring, insulating screw rod, cushion, polyimide film, connection piece, insulation board, brush, middle ring lies in pivot top position. Middle ring hot jacket trackslips sub - hot jacket on the ring of centre in the pivot, sliding ring and backing plate close be fixed in the son that trackslips on, the insulation board is fixed in on the sliding ring closing. Trackslip and be equipped with the insulating measuring device of two symmetric positions on the son, as measuring insulation resistance. Middle ring sum trackslips and adopts the mode of wrapping in proper order around polyimide film, connection piece and polyimide film between the son, increases the cooperation requirement is guaranteed to the middle ring sum tight volume between the son of trackslipping. Ring bottom position in the middle of the connection piece bottom is less than, the polyimide film bottom is less than connection piece bottom position, prevents the shaft current. The insulation board adopts partition organization, double-deck crisscross close be fixed in upper sliding ring on, prevent the dust get into in the middle of the ring with trackslip between the son production shaft current.