Jim,
There is a
disadvantage for brushless; High RPM. If you hear the term outrunner”it
means that the motor housing rotates for lower rpm/ higher
torque.
For a
thruster you will need a 1:4 reduction anyway.
As far as
I know there are no brushless outboards. Mastervolt offers Brushless
inboards.
http://www.mastervolt.us/marine/products/e-propulsion/
Not cheap.
But complete… I assume their units will not interfere with fishfinders
etc.
All the
best, Emile
Van:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens JimToddPsub@aol.com
Verzonden: zaterdag 25 december 2010
14:12
Aan:
personal_submersibles@psubs.org
Onderwerp: Re: [PSUBS-MAILIST] Brushless
motors
Yes, brushless are
used in model aircraft for two primary reasons: higher efficiency and
low RF interference. There are other advantages as
well.
I really know very
little about electric motors, controllers, etc. which is why I'm hoping
to hear comments from the experts. I prefer to buy and adapt
off-the-shelf units that are already designed for underwater applications
(saltwater) rather than building housings and so forth
myself.
I hope you and all
the PSubbers around the world are having a very merry Christmas.
The sun will rise in another 20 minutes here in the central
US.
In a message dated
12/25/2010 6:37:21 A.M. Central Standard Time, MerlinSub@t-online.de
writes:
Hmm.. the 1,6
to 2,6 kw high power running a modelhelicopter units also?
Better
test before speed on building 2-3 thruster this way and find out that the
sub sensors are blind by by pulse noise. The brushless electronic is also
pulse moudulation isn't it?
vbr
Carsten
<JimToddPsub@aol.com> schrieb:
>
Carsten,
>
> You brought up another advantage of
brushless motors. They cause much
> less interference
than brushed motors which is one reason they're used in hard
>
drives and cooling fans in computers.
>
>
Jim
>
>
> In a message dated 12/25/2010
3:17:46 A.M. Central Standard Time,
> MerlinSub@t-online.de
writes:
>
> Why not. But make shure that brushles motors
and sonar/echosounder do not
> interfer.
> vbr
Carsten
>
> <JimToddPsub@aol.com> schrieb:
>
> Since one of the problems with compensated motors is the tendency
of the
>
> > brushes to float at higher RPM,
this begs the question of why brushless
> > motors are
not commonly used instead to eliminate that issue?
>
Brushless also
> > tend to generate less heat as
well as having other advantages. Is the
>
>
> issue just the higher cost? Less availability?
Complexity of
> controllers?
> >
>
> I don't know If Minnkota produces brushless units or not, but
I can
> > contact them. What about the
manufacturers of bow thrusters?
> > Weigh in with what
you know.
> >
> > Thanks,
> >
Jim
>
>
>
>
>
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