I'm looking at using a motor to open/close a 3 way valve (see attached photo for reference) and have a few questions...
My thoughts were to use a stepper motor, to allow me to control how far to turn.
I've noticed all the motor I see have a "holding torque" listed. Is this the maximum torque that the motor can turn, or is it the most that it can hold? (or both?)
I have measured the amount of torque required to about 2.5Nm. I did this by hanging weight on the end of the handle and adding extra weight until it started to turn, so is is probably really not an accurate measurement, but at least it gives an idea.
I have found the following motor online, I has listed a holding torque of 121Ncm(1.21Nm), however it also lists the maximum permissable torque of 2Nm and a moment permissable torque of 4Nm.
Would this be suitable, or do I need a more powerful motor? I have also found the following one that has 3Nm of holding torque.
Thanks for your help.