A motor drive unit for driving a motor of a motorized window treatment may comprise software-based and hardware-based implementations of a process for detecting and resolving a stall condition in the motor, where the hardware-based implementation is configured to reduce power delivered to the motor if the software-based implementation has not first reduced the power to the motor. A control circuit may detect a stall condition of the motor, and reduce the power delivered to the motor after a first period of time from first detecting the stall condition. The motor drive unit may comprise a stall prevention circuit configured to reduce the power delivered to the motor after a second period of time (e.g., longer than the first period of time) from determining that a rotational sensing circuit is not generating a sensor signal while the control circuit is generating a drive signal to rotate the motor.

A motor drive unit for driving a motor of a motorized window treatment may comprise software-based and hardware-based implementations of a process for detecting and resolving a stall condition in the motor, where the hardware-based implementation is configured to reduce power delivered to the motor if the software-based implementation has not first reduced the power to the motor. A control circuit may detect a stall condition of the motor, and reduce the power delivered to the motor after a first period of time from first detecting the stall condition. The motor drive unit may comprise a stall prevention circuit configured to reduce the power delivered to the motor after a second period of time (e.g., longer than the first period of time) from determining that a rotational sensing circuit is not generating a sensor signal while the control circuit is generating a drive signal to rotate the motor.

The invention provides an overhead door tilt protection package comprising an enclosure secured to an overhead door, an electrical connection within the enclosure, electrical components within the enclosure including an electronic tilt detector continuously measuring the angle of door deviation between either a horizontal or a zero-set condition and a determined tilt angle of the bottom bar, producing a deviation signal, determining a stable deviation value from the deviation signal, and setting an electrical deviation condition upon the stable deviation signal reaching a predetermined level. The electrical components produce a visible door power on and door power off condition based upon tilt deviation.

The invention further provides a procedure for improving the operation and safety of overhead doors including measuring deviation of the bottom bar of a door from either horizontal or a pre-set zero condition in real time with an electronic inclinometer, restricting the deviation measurement to a single axis of deviation, averaging the real time signal, determining the average signal as below or above a preset limit and then setting a start/stop condition.

The invention provides an overhead door tilt protection package comprising an enclosure secured to an overhead door, an electrical connection within the enclosure, electrical components within the enclosure including an electronic tilt detector continuously measuring the angle of door deviation between either a horizontal or a zero-set condition and a determined tilt angle of the bottom bar, producing a deviation signal, determining a stable deviation value from the deviation signal, and setting an electrical deviation condition upon the stable deviation signal reaching a predetermined level. The electrical components produce a visible door power on and door power off condition based upon tilt deviation.

The invention further provides a procedure for improving the operation and safety of overhead doors including measuring deviation of the bottom bar of a door from either horizontal or a pre-set zero condition in real time with an electronic inclinometer, restricting the deviation measurement to a single axis of deviation, averaging the real time signal, determining the average signal as below or above a preset limit and then setting a start/stop condition.

A cover opening device of an electric sunshade for a side window is provided for connecting between a base and a protecting cover of the electric sunshade and connecting with a curtain support rod. The cover opening device operates by the curtain support rod mounted with a driving element passing through a pedestal, a linkage rod part connected with an abutted part connecting with the protecting cover to move the abutted part downward by a press of the driving element and to pivot the protecting cover for covering a groove by the linkage rod part, and an elastic element providing resilience force for opening the protecting cover. The cover opening device has a mechanism that opens the protecting cover beforehand and closes the protecting cover afterwards, thereby preventing the curtain from colliding with the protecting cover when the curtain is extending out and rolling up.

A cover opening device of an electric sunshade for a side window is provided for connecting between a base and a protecting cover of the electric sunshade and connecting with a curtain support rod. The cover opening device operates by the curtain support rod mounted with a driving element passing through a pedestal, a linkage rod part connected with an abutted part connecting with the protecting cover to move the abutted part downward by a press of the driving element and to pivot the protecting cover for covering a groove by the linkage rod part, and an elastic element providing resilience force for opening the protecting cover. The cover opening device has a mechanism that opens the protecting cover beforehand and closes the protecting cover afterwards, thereby preventing the curtain from colliding with the protecting cover when the curtain is extending out and rolling up.

A braking device for an automatic winding type screen device that stably brakes the automatic winding of a screen regardless of the temperature. The braking device comprises: a housing that is provided inside a winding shaft so as to be able to turn with the winding shaft to wind up a screen; a sleeve that is inserted into the housing and is mounted to a bracket so as not to be able to turn; and a mobile element that can rotate with the housing. A first spring and a second spring are provided on the outer side of the sleeve so as to have the mobile element therebetween. The mobile element twists forward on the sleeve along with rotation of the housing, and biasing forces of the first spring and the second spring that expand and contact with the forward twist of the mobile element brakes the rotation of the winding shaft.

A braking device for an automatic winding type screen device that stably brakes the automatic winding of a screen regardless of the temperature. The braking device comprises: a housing that is provided inside a winding shaft so as to be able to turn with the winding shaft to wind up a screen; a sleeve that is inserted into the housing and is mounted to a bracket so as not to be able to turn; and a mobile element that can rotate with the housing. A first spring and a second spring are provided on the outer side of the sleeve so as to have the mobile element therebetween. The mobile element twists forward on the sleeve along with rotation of the housing, and biasing forces of the first spring and the second spring that expand and contact with the forward twist of the mobile element brakes the rotation of the winding shaft.

A method for operationally controlling a motor-driven device for driving a home automated closure or sun-shading apparatus includes at least the following steps: —measuring (E21), via a measuring device, a first value of the strength of an electrical current passing through an electric motor; —determining (E24) a difference in strength relative to the first measured strength value after a period of time starting from the moment that the first strength value is measured has elapsed; —selecting (E25) one of the first threshold strength values on the basis of the elapsed time period; —comparing (E26) the difference in strength determined relative to the selected threshold strength value; and—determining (E27) the presence or absence of an obstacle or end of travel on the basis of the result of the comparison step (E26).

A rolling shutter driving device includes a motor, a locking assembly and a gearbox. The motor includes a stator and a rotor. The rotor includes a rotary shaft connected to the gearbox. The rotary shaft drives through the gearbox a rolling shutter to extend or retract. The locking assembly includes a brake pad slidingly fitted on the rotary shaft and a rotary member fixedly mounted to the rotary shaft. The brake pad is circumferentially fixed relative to the stator. The brake pad is slidable relative to the rotary shaft so as to be selectively engaged with the rotary member to lock the rotary shaft and hence hold the load in position, or disengaged from the rotary member to unlock the rotary shaft.