Originally Posted by Cartierusm  OK, so I'm building an automated machine for a specific operation and I'm going to use a stepper motors as I can control speed and location accurately.
Now I know if you up the volts you get better torque at higher speeds. SO what if I'm only going to be moving the stepper at 3 RPMs? What voltage would I need.
I'll be using 850 oz. in. stepper motors and probably wired bipolar parallel and use an inexpensive Probotix driver. At 3 RPM what oz in would I get and what power supply should I use? |
it all depends on the speed/torque curve of the steppers. The reason for running higher voltages is to push more current through the inductive reactance of the motor winding earlier in the step and so move the 'knee point' of the curve further to the right (maintaining torque at higher revs). Without the speed/torque curve and the motor specifications (inductance/resistance) its impossible to say, however the data sheets I have suggest that you should typically get 80 - 90% of the holding torque below 500 steps/sec on a big motor, thats 2.5 rps or about 180rpm...