[PSUBS-MAILIST] Brushless Thrusters

[Alan via Personal_Submersibles]

Vance,
that sounds like a good solution, thanks. The shafts out of most of these brushless motors
are very short so a flexible coupling would be a solution to that problem as well.
Alan


Sent from my iPad

> On 8/09/2014, at 12:01 am, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> 
> You could take the thrust issue out of the system entirely by the addition of your thrust bearings in the seal package. Use a flexible coupling between inner shaft stub and gear or motor output, then all you have to plan for is torque.
> 
> Vance
> 
> 
> -----Original Message-----
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Sent: Sun, Sep 7, 2014 12:04 pm
> Subject: Re: [PSUBS-MAILIST] Brushless Thrusters
> 
> Thanks Hank,
> in hindsight, the thrust bearing would have to be in the planetary gearbox.
> This may simplify things as I could possibly mount a gearbox with thrust bearing on to
> any suitable motor.  
> Alan
> Sent from my iPad
> 
> On 7/09/2014, at 9:07 pm, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
>> 
>> Alan
>> When I upgraded the cartridge seal in Gamma, I needed a pretty Beafy thrust bearing, it was no problem to get. have since changer to Magnetic. I think you could replace the bushing in a thruster with a ball bearing and never look back. 
>> Hank
>> 
>> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>; with 
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>; 
>> Subject: Re: [PSUBS-MAILIST] Brushless Thrusters 
>> Sent: Sun, Sep 7, 2014 1:43:49 PM 
>> 
>> 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, but
>> I'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, but
>> couldn'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 back
>> of 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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