RE: [CAD_CAM_EDM_DRO] Stepper Motor Overheating

The motors I have that have temperature ratings on the plate all specify
temperatures that are far above what you can hold. I don't know if that is
normal, but one is stickered as not to exceed 100 C on the endbell.

It would seem more likely to me that you would ruin a motor by exceeding the
rated amperage. Of course if you continued to run at the elevated amperage
you would soon exceed the temperature rating as well.

Tim
[Denver, CO]

> 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
>
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