OK, I think I'm catching on here.
If the windings are far hotter than the case, it would seem that there isn't much thermal linkage between the two.
I realize this is a new installation, but have you measured the cooling performance of the forced air relative to the effectiveness of the water cooling, independent of each other?
-Tom
--- In electricboats@yahoogroups.com, James Lambden <james@...> wrote:
>
> Tom,
>
> Mars motors maintains that the varnish on the windings is capable of 150 degrees.
>
> The windings will be far hotter than the case temperature.
>
> A good rule of thumb is that if you can't hold your hand on it, it is getting too hot.
>
> Adding cooling increases the efficiency of the system so is desirable in any event.
>
> Adding a circulation fan to the engine compartment and introducing new air is the easiest way to add cooling.
>
> James
>
> www.propulsionmarine.com
>
>
>
>
> On Mar 21, 2011, at 2:00 PM, Tom wrote:
>
> > James Lambden wrote:
> >
> > "These motors are capable of winding temperatures up to 150 degrees C, though my preference is to run them at 100 to 120 max."
> >
> > I had no idea that these motors were being run as these high temperatures. Last summer my motor felt too hot to keep my hand on, but nothing like 212-248F. I'll get a good measurement, but it looks like I'm fine without adding cooling.
> >
> > -Tom
> > >
> >
> >
>
No comments:
Post a Comment