Re: [CAD_CAM_EDM_DRO] Stepper Motor Overheating

Hi John,

What are you using for a stepper motor driver? From the temp you
describe, I doubt if you have hurt the motors. I'd suggest swapping the
drive to the two steppers, and see if the "problem" moves. IMO,
steppers don't need to "break in".

Alan KM6VV

keenlyside831@... wrote:

>
> Hi Folks:
>
> Having received great advice on simple stepper motor control software
> I have been trying some out and definetly moving up on the learning
> curve.
>
> Recently I have noticed that of the two stepper motors I am currently
> testing (Sherlines Shinano Kensi 100 oz holding torque jobbies) one
> of them has significantly less cogging resistance than the other. The
> one that has less cogging resistance is the one I have been primarily
> testing - the other is still basically unused.
>
> Now I understand that overheating a stepper motor will damage it and
> I am curious if I have damaged this one. During tests it definetly
> got plenty hot - but never so hot that it I couldn't still hold it in
> my hand (for a few seconds anyway). Experience with judging
> temperature of other devices has told me that if you can hold it in
> your hand it is probably still 50 ~ 60 degrees celcius or less.
>
> Is this too hot??
> What is the general operating temp for steppers??
>
> I am guessing that either I have caused the permanent magnets to loos
> some of their magnetism due to the heat OR everything is ok and it is
> normal for the stepper to "break in" a bit.
>
> The motor otherwise still works fine.
>
> Your advice is muchly appreciated.
>
> Thanks
>
> John