The present invention is structured by a dual-drive electric machine being combined with an epicycle gear set (EG101) and a controllable brake device, through controlling the controllable brake device to perform brake locking or releasing, the operations of transmission function of combining transmission or releasing between a rotation shaft (S101) at an output/input end, a rotation shaft (S102) at an output/input end and a sleeve type rotation shaft (AS101) at an output/input end of the epicycle gear set (EG101) are enabled to be controlled, and the interacting operation between the dual-drive electric machine (EM100) and the output/input ends are also enabled to be controlled.