Your problem sounds a lot like mine. I have the Minebea 17PM-K307-05VS motors. I can't get them turning and I am also getting the weird static when I touch the trimpot. First time I heard it I thought I blew something for sure. But ya I only touched the trimpot with one multimeter lead and it made that noise. And the noise was coming from the stepper lol. I am using a 12V supply, but now that you mention it I see the graphs in the datasheet and they do say supply voltage 24V. My motors are custom made so I can't find my exact datasheet. Have you had any more luck?
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