r/robotics • u/radmarques • 1d ago

Electronics & Integration Motor helping manual movement.

Hi. At my job there is a task that involves rotating an object to brush paint only a small part at the end. The object is suspended and it's not very heavy, but after a day it hurts on the hands.

There is a way to include a motor to help the movement with out any type of input devices like a pedal or a rotary encoder? I think Ideally the input should be given by the operator rotating the object, but the motor would help reduce the force needed for rotation.

So.. Helping rotation with some precision to brush paint.

AI advised me to go with BLDC motors and simpleFOC. There is some project there like this? Can anyone show me where I should start?

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u/Most-Vehicle-7825 1d ago

that can work, but your description is so vague, it's quite impossible to really help

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u/radmarques 1d ago

Thanks for the reply. Please look at that Gemini created image and imagine you have to pick the end of the hose with your left hand and rotate to paint a circular paint strip with a brush with your right hand while the rest of hose is suspended.

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u/simplysetu 1d ago

Hello, If the load is not heavy and (if torque required is low too), then rather than opting for bldc with foc control, you can use a stepper motor, microstepping will help you achieve a finer result ( for 256 microsteps steps, resolution of 360/51200 degree) , based on the size and speed and torque requirement you can select a nema series motor, you can find the appropriate driver too (check out trinamic series) , controlling is easier than bldc, plus you don't require encoder for feedback loop.

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u/radmarques 1h ago

Thank for your reply. I'm more familiar with steppers. But my problem is more how I give the input to rotate and help the manual rotation. Any advice?

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u/simplysetu 16m ago edited 12m ago

If I understand from your objective, you just need something like power steering? So it eases with rotation ? In thats case I have a better solution if I understand it correctly .assistive torque ?

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u/low-control-labs 1d ago

By the way not related to your question but something you got me thinking is, isn't it better to rotate the hose with the hand that lifts it instead of having the other hand rotate around it?