Re: Setting Gecko current

Hi John,

Setting current by motor temperature is not
going to be accurate enough to get the most
out of you motors without damage. There are
magnetic saturation effects that may limit
useful current before overheating sets in.

Stepper motors do get hot in normal use. They
will get just as hot sitting still as they
will running except in the case where the
drive has idle current reduction enabled.
Typically a stepper motor can be run hot
enough that you can touch it quickly without
pain, but is too hot to keep your hand on
for very long. This is not a precise temperature
measurement, but then this is not a precise
way to set current. :-)

Cheers,
Steve Stallings
www.pmdx.com

--- In CAD_CAM_EDM_DRO@y..., "cncnovice" <crcitser@g...> wrote:
> Hello list,
> This is my second attempt to post this question. I apologize if it
> somehow gets duplicated by Yahoo.
>
> Can the current sense resistor on a Gecko drive be set for an
> unidentified stepper motor by the operating temperature of the
motor?
>
> In heavy use, do stepper motors get too hot to touch?
>
> I am just finishing my CNC router using surplus parts, and I do not
> want to underdrive an axis.
>
> Many thanks in advance for your advice. This is a great list for
> learning.
>
> Best to all,
> John Champlain