Re: [CAD_CAM_EDM_DRO] Gecko Heat Sink

Alan Marconett KM6VV wrote:

> 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)!

This is in the normal range for steppers. Assuming 70 F ambient, that is
a 60 F rise, or 33 C. The motors are likely rated for 40 C from a
higher ambient.

> 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!

Ugh, that may be a bit waek.

Jon