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A conveyor comprising a conveyor belt having rollers with metallic or magnetic rotors. A magnet or metallic element next to the conveyor belt is positioned to rotate the rotor. A magnetic field produced by the magnet or by the magnetic rotor rotates the rollers as they pass the magnetic field or as

A conveyor comprising a conveyor belt having rollers with metallic or magnetic rotors. A magnet or metallic element next to the conveyor belt is positioned to rotate the rotor. A magnetic field produced by the magnet or by the magnetic rotor rotates the rollers as they pass the magnetic field or as the magnetic field is changed.

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1. A conveyor belt advanceable in a direction of belt travel and comprising a plurality of first rollers having rotors containing ferrous or magnetic material forming poles passing through a magnetic field to effect the rotation of the rollers. 2. A conveyor belt as in claim 1 wherein the poles are

1. A conveyor belt advanceable in a direction of belt travel and comprising a plurality of first rollers having rotors containing ferrous or magnetic material forming poles passing through a magnetic field to effect the rotation of the rollers. 2. A conveyor belt as in claim 1 wherein the poles are helical. 3. A conveyor belt as in claim 1 wherein the poles are linear. 4. A conveyor belt as in claim 1 wherein the rotors have clockwise parallel grooves and counterclockwise parallel grooves in their peripheries intersecting to provide segmented poles between the grooves. 5. A conveyor belt as in claim 1 wherein the first rollers are article-supporting rollers. 6. A conveyor belt as in claim 1 wherein the first rollers are in-line rollers. 7. A conveyor belt as in claim 1 wherein the first rollers are transverse rollers. 8. A conveyor belt as in claim 1 wherein the first rollers are oblique rollers. 9. A conveyor belt as in claim 1 wherein the rotors are made of a metallic material. 10. A conveyor belt as in claim 1 wherein the first rollers have an outer cylindrical shell made of a non-metallic material covering the rotors. 11. A conveyor belt as in claim 1 further comprising a plurality of rotorless second rollers arranged in frictional contact with the plurality of first rollers in stacked pairs, wherein each of the pairs includes one of the second rollers atop one of the first rollers so that rotation of the first roller by magnetic interaction with the magnetic field causes rotation of the second roller in the opposite direction. 12. A conveyor belt as in claim 1 further comprising: a series of belt modules hingedly interlinked end-to-end to form a conveyor belt, each of the belt modules comprising a body section extending from a first end to a second end in the direction of belt travel;wherein the body section of at least some of the belt modules includes a top surface and a bottom surface opposite the top surface, at least one cavity formed in the body section and opening onto the top surface and one of the plurality of first rollers rotatably disposed in the cavity. 13. A conveyor comprising: a conveyor belt advancing in a direction of belt travel and having a plurality of rollers;a plurality of magnets producing a magnetic field that passes through the conveyor belt and interacts with the rollers, wherein the advancing of the conveyor belt in the direction of belt travel through the magnetic field causes the interaction of the magnetic field with the rollers to rotate the rollers. 14. A conveyor as in claim 13 wherein the magnets are stationary magnets underlying the conveyor belt. 15. A conveyor as in claim 13 wherein the rollers include rotors with at least two poles. 16. A conveyor as in claim 15 wherein the magnets comprise stators underlying the conveyor belt producing the magnetic field and forming switched reluctance motors with the rotors. 17. A conveyor as in claim 15 wherein the rotors contain ferrous or magnetic material. 18. A conveyor comprising: a conveyor belt advancing in a direction of belt travel and having a plurality of rollers having rotors made of a magnetic material to produce a magnetic field, wherein the rotors have magnetic poles;a plurality of metallic elements underlying the advancing conveyor belt and interacting with the magnetic field produced by the rotors to cause the rollers to rotate by the magnetic attraction of the magnetic poles to the metallic elements.