Hello everyone,
I am working on a project that will use an electric motor to wind two garage door springs.
The two springs together will have a maximum torque of 720 in-lbf. I am using a 10:1 worm gear reducer in order to achieve a more manageable torque.
I am looking for a 12v DC motor that is capable of producing 72 in-lbf. I’ve found a few options in industrial-use motors, but they all cost $400+, and I’m hoping I don’t need to spend that much!
60 RPM+ would be ideal, since we would like to fully wind the springs in less than a minute. (60 RPM becomes 6 RPM through the worm gear, and the springs can turn 6 rotations)
One option I’ve found so far:
robokitsworld.com/index.php?main_page=product_info&cPath=2&products_id=275
This 12v DC motor rotates at 200 RPM and produces 32 kg cm of torque = 28 in lb.
I could make this work with another gear reduction of around 2.75, which would also bring down the speed to about 73 RPM
However, I notice on some websites they list the maximum torque as the “stall torque” which occurs as the RPM approach zero. Does anyone know if the torques listed here are produced at the listed RPM? Or is the torque listed here also the stall torque?
Any help would be appreciated! Thanks!
Kevin