A DRIVE UNIT FOR RAISING AND/OR LOWERING A ROLLER SHUTTER

摘要

A drive unit ( 10 ) for a roller shutter assembly is disclosed. The drive unit ( 10 ) includes at least two electrical motors ( 14 ) and a reduction gear train ( 12 ). Each electric motor ( 14 ) includes an output shaft that is mechanically coupled to an axle engaging means ( 20 ) via the reduction gear train ( 12 ). The electric motors ( 14 ) are operable to generate mechanical power generated by the combination of the electric motors ( 14 ) is coupled to the axle engaging means ( 20 ) via the reduction gear train ( 12 ) to wind a roller shutter of the roller shutter assembly onto or off an axle.