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Stepper motors increase speed when touched.

Posted by snorrus 
Stepper motors increase speed when touched.
July 26, 2016 09:50AM
I'm working on a robotic arm and just hooked up my elektronics. All the steppers move just fine, but when I touch the motors they crank up the speed. What could be the cause of this? I've heard of driver IC's being sensetive to static but I can't understand why the motors would react like this when touching the motor casing!

Hope you guys have some explanation for this.
Re: Stepper motors increase speed when touched.
July 28, 2016 01:39PM
I guess it's related to long motor cables?!
How do you know it's faster? Do you actually see it or does it only sound different?
Did you twist the wires of each phase and then twist both phases to eliminate interference?
Is there a good ground connection between stepper and driver/controller? Maybe you are irritating the phase current control loop by touching the motor.
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