you have at least 2 options :
one which is a bit DIY, take wipers motor with a kind of winch or wheel you mount on it's axis or you buy with this wheel already mounted on the wiper's motor (don't know if it's the right word) using steel wire you can have a cheap system, the wiper motor will allow to have a slow move with enough torque.
second option is a mechanical strut made of an infinite screw, this screw is moving with a tiny electrical dc motor too mounted directly on the screw axis.
You can google and find it i'm sure, i'm not enough familiar with english words to find it for you but i think you see what i'm talking about.



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