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Jonathan_hodgkins's avatar

Selecting a correct DC stepper motor for a project?

Asked by Jonathan_hodgkins (678points) November 11th, 2017

I haven’t done much with motors, so I need some assistance.

I am trying to rotate a 20” stainless steel shaft back and forth in a 130 degree rotation. It needs to rotate to the 130 degree position and then move back to the 0 degree and repeat. The movement should be relatively quick, say the entire 130 degrees in 10 seconds.

Is a stepper motor the best option for this and if so, what other factors do I need to make the best selection?


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3 Answers

LuckyGuy's avatar

You will need to calculate the moment of inertia of the shaft you are turning so you can determine the required torque. You will get that after you determine the peak acceleration from the velocity profile or the position profile.
For example, you say you want to complete the movement in 10 seconds. Do you want to spend half the time accelerating and half decelerating? Or do you want it to move one way quickly and the other direction slowly?
Once you have acceleration, displacement, and moment of inertia you can size the motor for power.

ARE_you_kidding_me's avatar

Yes, a stepper is what you want.

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