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

A little late coming into this discussion, but just one more thing to
consider -- when the motors are holding their position, is one winding
energized, or both? If you have 1.4A flowing through one winding, it's quite
different from 1.4A flowing simultaneously through two. In fact, depending
on the ambient temperature, and how efficient the motor is at dissipating
heat, I think the temperature in one case can be close to twice that of the
other. At least theoretically that seems possible.

Vlad

On 8/23/06, 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
>
>
>
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
> timg@...
> Moderator: pentam@... indigo_red@... davemucha@...
> [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it
> if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for OT
> subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
> THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>


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


[Non-text portions of this message have been removed]