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

If you're driving lead screws with the motors there is no reason not to
reduce the current when not moving. I have a SLA7062M based system that can
do that automatically. Cheap. Full details on my web site.
--
Phil Mattison
http://www.ohmikron.com/

----- Original Message -----
From: lcdpublishing <lcdpublishing@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, August 23, 2006 8:23 AM
Subject: [CAD_CAM_EDM_DRO] How to deal with Stepper Motor heat - 150 degrees
F


> 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
>
>
>
>
>
>
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