Re: How to deal with Stepper Motor heat - 150 degrees F

Chris,
Our HobbyCNC PRO driver board kit offers idle current reduction at a
very reasonable price. We have it in a 3 or 4 axis version. Also
has driver chip protection in case of open or shorted stepper
windings, something the 7062M lacks.
Uses the very latest in Unipolar driver chips.

The SLA7062M is already old technology and we're closing them out of
our product line at very special prices.

Dave Rigotti
www.hobbycnc.com


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "lcdpublishing"
<lcdpublishing@...> wrote:

>
> Hi guys,
>
> I ran a test the other day to see how hot the stepper motors are
> getting on my machine. After 30 minutes, they (3 of them) were

all

> at 150 degrees F.
>
> The motors are 5 volt motors rated at 1.4 Amps, nema 17. I am
> driving them at 30 volts and 1.4 amps. The driver chip is the
> SLA7062M chip. This heat test was performed with the motors

holding

> their position as that is the best way I know to "push them" for
> heat build up.
>
> I know I could get another transformer and drop the voltage, but
> would prefer to keep it at 30 volts for performance. I have a bit
> of room where I could add some chunks of aluminum for heat

sinking,

> but not sure if that would get the temp down enough. I have no

room

> for fans so I am sort of pondering what directions I can go to

deal

> with this.
>
> As always, I am open to any and all suggestions or ideas.
>
> One interesting thing I heard from a very reliable source is that

if

> I switch from the SLA7062M based driver to a Gecko driver, the

motor

> heat would drop down significantly. However, I don't have the
> budget for 3 Geckos on this little machine.
>
> Chris
>