Brushless DC Motor to include Linear Actuator push up mechanism; Electronic Circuit Board; Antenna; Wheel runners; Rack; Base plate. Motor used to activate the Linear Actuator push up mechanism of the unit control unit being actuated to drive the moveable seat so that the gear meshes with the rack and the rotation power unit being controlled to drive the gear to roll on the rack so as to control the canvas curtain eith to be stretched laterally or to be collapsed laterally on the rail