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 (11, 12) 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 (11, 12) 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 (11, 12) 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 (11, 12) 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 (11, 12) 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.