T-Pain Is On A Boat: Re: [Electric Boats] Water Cooled Electric Drive

Monday, March 21, 2011

Re: [Electric Boats] Water Cooled Electric Drive

Thanks for the performance info, James.

I added some sound insulation to the motor and controller area in my launch which has helped reduce the motor noise, but has also restricted the airflow in the compartment.

It's not a problem in Puget Sound this time of year, but I'm counting on it warming up one of these days, and it looks like some ducting and forced air is the place to start.

-Tom

--- In electricboats@yahoogroups.com, James Lambden <james@...> wrote:
>
> Tom,
>
> Both contribute about equally, reducing temperature by about 15 to 20 degrees C each. Its the combination that really makes a difference.
>
> There is no direct pathway between the windings and the case. The case is heated up by being in close proximity to the windings.
>
> James
>
> www.propulsionmarine.com
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>
>
>
> On Mar 21, 2011, at 6:14 PM, Tom wrote:
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> >
> >
> > 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
> > > > >
> > > >
> > > >
> > >
> >
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