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A motor assembly for driving a foldable screen includes an inner tube, a motor device mounted in the inner tube and including a DC motor, an outer tube mounted around the inner tube, a control device, and a connecting device mounted to an end of the inner tube. A screen is mounted to the outer tube.

A motor assembly for driving a foldable screen includes an inner tube, a motor device mounted in the inner tube and including a DC motor, an outer tube mounted around the inner tube, a control device, and a connecting device mounted to an end of the inner tube. A screen is mounted to the outer tube. The control device includes a power circuit connected to an external AC power source via a plug. The control device reduces a voltage from the external AC power source and rectifies current from the external AC power source. The control device generates a first DC power source for a circuit system and a second DC power source for driving the motor.

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What is claimed is: 1. A motor assembly for driving a foldable screen, comprising: an inner tube; a motor device mounted in the inner tube, the motor device including a DC motor; an outer tube mounted around the inner tube, a screen being adapted to be mounted to the outer tube; a control device in

What is claimed is: 1. A motor assembly for driving a foldable screen, comprising: an inner tube; a motor device mounted in the inner tube, the motor device including a DC motor; an outer tube mounted around the inner tube, a screen being adapted to be mounted to the outer tube; a control device including a power circuit connected to an external AC power source via a plug, the control device reducing a voltage from the external AC power source and rectifying current from the external AC power source, the control device generating a first DC power source for a circuit system and a second DC power source for driving the motor; a connecting device mounted to an end of the inner tube wherein the outer tube and the motor turn jointly, the control device further comprising a main controller, a motor detecting circuit, a drive circuit, a manual controller, a receiving circuit, a remote controller, and a magnetic ring, the magnetic ring being mounted to an end of the outer tube to turn therewith, the motor detecting circuit being electrically connected to the main controller and including a sensor for detecting an angular position of the magnetic ring and sending a signal regarding the angular position of the magnetic ring to the main controller, the drive circuit being electrically connected to the main controller and the motor, the main controller outputting commanding signals to control operation of the motor, the receiving circuit being electrically connected to the main controller, the remote controller including a plurality of buttons allowing manual input of a user, the magnetic ring including a magnetic member having a plurality of poles corresponding different angular positions of the magnetic ring, the outer tube and the magnetic ring being turned when the motor is activated, with the sensor detecting turns of rotation of the magnetic ring and the angular position of the magnetic ring wherein the motor device comprises a transmission sleeve that is securely connected to the outer tube to turn therewith, the outer tube further comprising an engaging notch in an end thereof, the magnetic ring including a protrusion for engaging with the engaging notch, allowing joint rotation of the magnetic ring and the outer tube. 2. The motor assembly for driving a foldable screen as claimed in 1 wherein the connecting device comprises an inner connecting seat securely mounted in the end of the inner tube, the connecting device further comprising an outer connecting seat securely connected to the inner connecting seat to turn therewith, with an annular groove being defined between the inner connecting seat and the outer connecting seat for receiving the magnetic ring.