Re: [CAD_CAM_EDM_DRO] Re: Stepper Motor Power Calculations

On 1/23/06, Phil Mattison <mattison20@...> wrote:
[snip]

> I would think
> that the motor current ratings are for holding current, and could be
> substantially exceeded when stepping at high speed without damaging the
> motor, since heat dissipation is the main reason for current limitation.


It is, indeed the main limitation. Out of curiosity I did some searching and
came up with this table: http://www.kjmagnetics.com/specs.asp

Those are some seriously low temperatures! It shows that it does not take
much heat to permanently damage a neodymium magnet. Depending on the motor
design, I think, the magnets may have a hard time transferring heat to the
body of the motor. You may not even realize that your motor is at risk until
it is too late.

(probably 99% of you knew that already, but just how low the safe operating
temperature can be was news to me. So I figured I'd share what I found and
maybe save somebody a bit of extra grief)

Vlad

[snip]

--
Vlad's shop
http://www.krupin.net/serendipity/index.php?/categories/2-metalworking


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