A sorter conveyor having cross-belts for supporting and discharging article is disclosed, wherein the cross-belts are driven by interaction between a rotor moving with the cross-belts and stationary electric stator parts, wherein the rotor is arranged separate from the cross-belt and is connected to a drive roller with a transmission. Further is disclosed such sorter conveyors having tilt-trays driven by interaction between rotors moving with the tilt-trays and stationary electric stator parts, as well as such sorter conveyors which are driven along the stationary track by means of stationary linear motor stator parts interacting with the reaction means. Lastly, rotors and the manufacture of such rotors are disclosed.