Re: [CAD_CAM_EDM_DRO] Gecko Heat Sink

Hi Joe,

How warm does the heat sink get? Mariss can probably give you a formula
to calculate the heat sink thermal resistance needed at various
currents/voltages. A lot like ohms' law, you have a certain amount of
heat, and you must conduct it away to keep the temp below the rated
limits.

My heat sink is cool, it's the old Superior Electric M062 motors I'm
worried about! 1.9A 4.7V, series connected, I selected 2A drive (do I
need to derate by .707?), and they get quite hot (over 130F)! So I
think these old motors may not be suitable! They're only 60 oz/in
anyway, I don't have new bipolar motors yet!

Alan KM6VV


Joe Vicars wrote:

>
> Ok, now I am worried about heatsinking my G201's properly. I am running 75V 7amp basically maxed out. I have all three drivers on the
> same heat sink. It's about 6" by 8" with ten or twelve 2 inch fins. I also have a fan blowing directly on the fin area.
> Is this adequate?
>
> Alan Marconett KM6VV wrote:
>
> >
> > Although I mounted the pair on
> > a 6x6x1.5" finned heatsink, they run perfectly cool (37v, 2A)!