[PSUBS-MAILIST] Brushless Thrusters
Alan via Personal_Submersibles
personal_submersibles at psubs.org
Wed Sep 10 09:32:21 EDT 2014
Thanks Hank,
I have been looking under "planetary gear box"; "gearhead" turns up a lot
more results. Finding a motor of sufficient power with a gearhead already
on it would be a real plus, as the gearboxes themselves are only compatible
with certain motors.
I have put out an SOS to a Chinese National working in the electronics field.
There are a lot of Chinese products that show up on searches, but the sites
& information is a bit bewildering to me.
Alan
Sent from my iPad
> On 10/09/2014, at 7:27 pm, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Alan,
> Check out ebay for gearhead dc motors. I had a look a while ago for a motor to run my external hyd pump. There area bunch of cheap China inline motors.
> Hank--------------------------------------------
> On Wed, 9/10/14, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> Subject: Re: [PSUBS-MAILIST] Brushless Thrusters
> To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
> Received: Wednesday, September 10, 2014, 6:04 AM
>
> Hi
> Brian,I don't know a lot about them, but I
> believe you can't run them off DC& they
> are generally heavyweight industrial
> units.Alan
>
> Sent
> from my iPad
> On
> 9/09/2014, at 10:48 pm, Brian Cox via Personal_Submersibles
> <personal_submersibles at psubs.org>
> wrote:
>
> Why not just use an AC induction
> motor then?
>
> --- personal_submersibles at psubs.org
> wrote:
>
> From: Alan via
> Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Brushless
> Thrusters
> Date: Tue, 9 Sep 2014 22:24:04
> +0700
>
> Hi
> Alec,not sure what motivated me down this path,
> but eventually it will add more to the
> psubknowledge pool.The brushless
> motors are used successfully on a lot of rovs &
> expensive submersibles,so I assume the pros out
> way the cons. Just a matter of learning how to put
> togethera good package. The Haswing Protruar
> brushless Chinese trolling motor that Emile
> useswas a very cheap unit. I made enquiries a few
> years ago & they offered me an ex
> factory sample thruster for I think a couple of
> hundred dollars. The motors I'm looking at
> are used on model trucks for racing on short courses; so
> should be able to wind them up quickly. One problem is that
> a lot of motor controllers for themdon't have
> reverse.The motors are so small, you could
> probably use a standard peice of aluminium pipeto
> house them, & machine the propellor shaft & bearing
> housing end out of a solid tube ofaluminium.
> Alan
> Sent from my
> iPad
> On 9/09/2014, at 8:30 pm,
> Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
>
> That is
> remarkable power for the size, very interesting for that
> reason alone. But it seems to me like quite a challenge to
> adapt as a thruster. I recall Emile's comment that the
> high-RPM Chinese brushless trolling motor he was using
> required something like ten seconds to wind up when you gave
> it juice. The efficiency makes it great for surface runs but
> not useful for submerged maneuvering. You might have the
> same issue with this if you need to gear it down.
> Best,
> Alec
> On
> Tue, Sep 9, 2014 at 12:35 AM, Alan via Personal_Submersibles
> <personal_submersibles at psubs.org>
> wrote:
> Update,Am
> still Googling away in pursuit of a home made brushless
> thruster.I am set on using an in-runner motor as
> they have the coils on the outside & will be
> ableto transfer heat through the
> can.The problem with in-runners is they have
> higher revs than out-runners, however either
> will require a planetary gearbox. I am looking
> at reducing the revs down to below 3000
> rpm. This is based on other brushless thrusters
> I have looked at but might not be right ( any
> recommendations)?Another problem is that most
> seem to draw huge amps.Here is a 1200W motor for
> $30-. Of course there is the price of the controller &
> planetary gear that are needed.http://www.hobbyking.co.uk/mobile/viewproduct.asp?idproduct=17720&type=&idparentcat=364Most
> of the suitable motors seem to be found at places like Hobby
> King, and are used on RC trucks, or found on E bike sights.
> The aircraft motors aren't as
> robust.These motors are tiny, but hugely
> powerful, so there is the potential to make a small
> streamlinedpowerful unit.I haven't
> had much luck with a matching gearbox. Some of the planetary
> gearboxes recommendoiling (no good to me unless I
> oil compensate) while others don't. I am looking for a
> cylindrical unit to match my motor, preferably with thrust
> bearings.If anyones got any advice or experience
> in this realm I'd be pleased to hear
> it.Regards Alan
>
> Sent from my
> iPad
> On 7/09/2014, at
> 8:43 pm, Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
>
> Hi
> Hank,the kort nozzle on the Indonesian thruster
> looks a bit Naff. ( I am designing an art work
> here.)I could get a price for the unit without
> kort nozzle, butI'm wondering if I could
> build something for 1/2 that price.There are some
> reasonably priced brushless motors about.I
> don't know that I could just retro fit a thrust bearing
> inside the can of the motor.I tried to put a
> thrust bearing for reverse inside my brushed thrusters,
> butcouldn't find one with a thin enough
> section to fit.Also the motors are a bit
> expensive to just buy & hope you can fit
> one.How did you fit the thrust bearing on Gamma?
> Did the propellor shaft extend out the backof
> the motor?Alan
>
> Sent from my iPad
> On
> 7/09/2014, at 7:22 pm, hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org>
> wrote:
>
> Allan
> Dont
> worry about thrust bearings to much. They are aesy to get,
> I bought one for Gamma , real heavy duty for 80 dollars.
> Personally I would just use a good quality bearing and
> replace it once a year for 8 bucks, if it is a small
> thruster. Are you not happy with the Indonesia thrusters?
> Or to pricey?
> Hank
>
>
>
>
>
>
>
>
> From:
>
> Alan via Personal_Submersibles
> <personal_submersibles at psubs.org>;
>
>
>
> To:
>
> Personal Submersibles General
> Discussion <personal_submersibles at psubs.org>;
>
>
>
>
> Subject:
>
> [PSUBS-MAILIST] Brushless
> Thrusters
>
>
> Sent:
>
> Sun, Sep 7, 2014 11:58:56 AM
>
>
>
>
>
> Hi people,
> I've
> spent several hours today looking at brushless thrusters
> & wonder if anyone else has looked at them or got any
> ideas. There is the Indonesian thruster I posted a few weeks
> back at US 2,200. There is also the Haswing Protruar 2hp
> that Emile has; however they state that it's for fresh
> water only, & I think Emile said it was a bit noisy.
> The inrunner motors that have the winding on
> the outside, seem a good option as they cool through
> convection to the can. They also need higher revs for torque
> & require a planetary gear box or similar. ( which a lot
> have built in)
> I was looking at the
> option of making my own thruster, however the motor would
> require a thrust bearing & I don't
> know of any that would have one other than
> maybe a high powered battery operated drill.
> Any thoughts, suggestions thanks.
> Alan
>
> Sent from
> my
> iPad
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