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Thread: Automatic Window Help

  1. #1
    Associate Engineer
    Join Date
    Jan 2018
    Posts
    1

    Automatic Window Help

    Hi guys,
    I am currently in college and have to complete a project. For this project, i have decided to create an automatic window opener, based on internal temperature and rain conditions. The window this will be installed on is a top hinged window and about a metre wide.
    After some research of existing methods, i have found this design on thingiverse:
    https://www.thingiverse.com/thing:134236

    I really like this idea and would like to base my design on it, however i think that my window will be much more difficult to open than the one in the video, and am worried that the motor won't be powerful enough.
    I also want to use a raspberry pi to control the mechanism, and so the motor will need to be compatible with it.
    I don't know anything about controlling motors with raspberry pi's, however from research, i have found that i can use a L293D board to control a motor up to 2A.
    It would also be preferable if the motor was relatively cheap, as i am paying for it myself.

    I have found this motor which i think might be powerful enough on RS Components which i think might work:
    https://uk.rs-online.com/web/p/dc-ge...otors/1346440/

    I can also move the mechanism from the hinge side to the opening side, to make it easier to open, as well as using one mechanism on each side.

    Therefore, i was wondering if any of you have an advice on what motor i can use, how i could alter the design to make it more powerful, or anything else you might know.
    Sorry if this is in the wrong place or the question i am asking is obvious, but i am still in college and quite stuck.

    Thanks,
    Chris

  2. #2
    Project Engineer
    Join Date
    May 2015
    Posts
    120
    Start by looking at the low cost solutions that are on the market: https://www.menards.com/main/doors-w...4423378396.htm.

    It only has temperature control but get creative on the rain closure by making it automatic as well. Or design it as rain proof from the start with a bottom vented cover.

  3. #3
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,096
    To determine the force required of your motor, sum the mass of all components being lifted and apply a frictional force to each contact surface(s) within the mechanism(s).


    Apply a factor of safety (FOS) that seems reasonable (1.4?).

    https://www.engineersedge.com/analys...ety-review.htm

    When you know the expected axial force applied to the motor, use one of the following equation/calculators to determine the required motor design torque.


    https://www.engineersedge.com/calcul...orque_calc.htm

    https://www.engineersedge.com/mechan...ions_13698.htm

    Don't forget that you could include a torque multiplier or gear reduction design as well.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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