Drive arrangement for driving a belt of an enclosed belt conveyor , comprising - a conveyor drive assembly arranged to drive the belt of the enclosed belt conveyor , the belt having a conveyor run in a conveying direction and a return run in an opposite direction , the conveyor drive assembly arranged to drive the belt of the conveyor run in the conveying direction , and - a return drive assembly arranged to drive the belt of the return run in the opposite direction , - wherein the conveyor drive assembly comprises a conveyor run drive roller in friction connection with at least one of two opposite longitudinal edges of the belt of the conveyor run driven by a conveyor drive unit , and the return drive assembly comprises a return run drive roller in friction connection with at least one of the two opposite longitudinal edges of the belt of the return run driven by a return drive unit , at least one control unit, characterized in that said at least one control unit is adapted to control the torque applied by the conveyor drive unit and the return drive unit , and is configured so that when the enclosed belt conveyor drives along a curved path, said conveyor run drive roller and return run drive roller are both driven with the same predefined torque in order to cause a constant movement of the enclosed belt conveyor . comprising - a conveyor drive assembly arranged to drive the belt of the enclosed belt conveyor , the belt having a conveyor run in a conveying direction and a return run in an opposite direction , the conveyor drive assembly arranged to drive the belt of the conveyor run in the conveying direction , and - a return drive assembly arranged to drive the belt of the return run in the opposite direction , - wherein the conveyor drive assembly comprises a conveyor run drive roller in friction connection with at least one of two opposite longitudinal edges of the belt of the conveyor run driven by a conveyor drive unit , and - a conveyor drive assembly arranged to drive the belt of the enclosed belt conveyor , the belt having a conveyor run in a conveying direction and a return run in an opposite direction , the conveyor drive assembly arranged to drive the belt of the conveyor run in the conveying direction , and - a return drive assembly arranged to drive the belt of the return run in the opposite direction , - wherein the conveyor drive assembly comprises a conveyor run drive roller in friction connection with at least one of two opposite longitudinal edges of the belt of the conveyor run driven by a conveyor drive unit , and the return drive assembly comprises a return run drive roller in friction connection with at least one of the two opposite longitudinal edges of the belt of the return run driven by a return drive unit , at least one control unit, characterized in that said at least one control unit is adapted to control the torque applied by the conveyor drive unit and the return drive unit , and is configured so that when the enclosed belt conveyor drives along a curved path, said conveyor run drive roller and return run drive roller are both driven with the same predefined torque in order to cause a constant movement of the enclosed belt conveyor . <EOS>