1. #1
    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.

    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?

  2. #2
    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.

  3. #3
    Is it possible you overheated the rotor and it eventually cooled down?

  4. #4
    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.

Similar Threads

  1. Congratulations to Gary @ Zapp
    By JAZZCNC in forum General Discussion
    Replies: 7
    Last Post: 21-09-2013, 06:44 PM
  2. Zapp 3-Axis kit - putting it all together
    By birchy in forum Motor Drivers & Controllers
    Replies: 5
    Last Post: 18-02-2013, 11:05 AM
  3. Zapp Automation CNC Driver Kit 4 Axis
    By whensparksfly in forum Motor Drivers & Controllers
    Replies: 7
    Last Post: 01-03-2012, 12:54 PM
  4. ZAPP SY60 wiring help
    By Smiler in forum Stepper & Servo Motors
    Replies: 7
    Last Post: 07-06-2010, 07:28 PM
  5. Air compressor - faulty, how do I get the motor out?!
    By HankMcSpank in forum General Discussion
    Replies: 5
    Last Post: 26-10-2009, 10:33 AM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts