[PSUBS-MAILIST] Brushless Thrusters
hank pronk via Personal_Submersibles
personal_submersibles at psubs.org
Wed Sep 10 08:27:58 EDT 2014
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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