What size motor for my robot hips?

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I need help! I’m in the beginning stages of building a 48" tall “humanoid” bot.

I am using a single 12v dual shaft geared motor for the hips. Essentially, I am just wanting the bot to be able to squat down. I need to know what size motor to use so it will be able to lift itself back up. I estimate the weight from the hips up will be around 35 lbs.

Voltage: 12
RPM: ?
Kg.cm: ?

Any advice would be greatly appreciated!!

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Hi @Bryan_Miller and welcome to our forum!

I think this motor sizing tutorial and motor sizing tool can help you choose a suitable motor:

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This one may help a bit too: Design of the power-assisted hip exoskeleton robot with hydraulic servo rotary drive | IEEE Conference Publication | IEEE Xplore

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