RE: [CAD_CAM_EDM_DRO] Re: Step motor current

> step motors run hot specialy when stoped,but not to hot or it will
> desmagnatize.If you can't hold it with bare hands than lower the
> courrent.
> Hope it helps.
> Fogassa.

Using what you can hold with your bare hands as a measure is probably being
very conservative. I just double checked some of the motors I have. The
instructions with a Vexta NEMA 23 says to keep the outer case under 100 deg
Centigrade and if temps are higher to use fans for cooling. The Superior
NEMA 34 with an encoder says the rear end bell of this encoder equipped
motor is not to exceed 100 deg Centigrade and the plate has the temperate
rise marked as 65 deg centigrade so if you are starting at room temp you
will expecting temps around 100 deg Centigrade. No, I don't run any of them
that hot, but my point is most steppers I have seem are rated to a
temperature that I wouldn't even want to touch much less hold. Agreed you
get little reduction in torque if you drop from the maximum amperage, but
the safety margin temperature wise is there.


Tim
[Denver, CO]

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http://www.ktmarketing.com