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RE: [PSUBS-MAILIST] Brushless motors



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

 

Carsten,

 

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.

 

Cheers,

Jim

 

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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