View Full Version : 3.0Nm stepper from Zapp stopped working / faulty

19-11-2010, 06:37 PM
One of these stepper motors that I have is not working properly:


The max rpm has suddenly decreased greatly - won't go above 620 rpm with no load. It just misses steps, or just stalls whilst accelerating. :thumbdown:

I've tried it on to other identical, PM752, drivers running on 70v and get the same symptoms - so it's not the driver that's the problem.

My other 3 of these steppers are all fine...

Any ideas what could be wrong / where to go from here?

19-11-2010, 06:43 PM
Ok well that was weird ... it's suddenly started working just fine!
Still, I'd like to know what might have caused it so it can't happen whilst the machine is running.

Robin Hewitt
19-11-2010, 08:41 PM
Is it possible you overheated the rotor and it eventually cooled down?

19-11-2010, 09:03 PM
No, the motor had only been on a few seconds, and off for about a month. Not warm at all. It happened just after I'd installed 4th stepper driver and cleaned out all the dust from the computer.