[PSUBS-MAILIST] Fw: motor

Mon Oct 3 17:50:29 EDT 2016

Hi James,
am answering the question for Hank here, & adding some more comment.
On his original Ebay link, if you scroll through the images, there is a diagram
of the motor internals that says the controller is inside. I was wondering about
this & can't see any evidence to the contrary. All these brushless motor controllers
have large capacitors that could be susceptible to pressure in a compensated
motor if you went too deep.
It would be interesting to pressure test a similar capacitor to see where they fail.
The motor is an in-runner that has the coils on the outside & permanent magnet
part rotating. These have less torque than the out-runner motor, so I am dubious
of their performance statistics.  
Still the housings are hard to make & they look like they have done a good job.
Would love to pull one apart.
Alan
Sent from my iPad

> On 4/10/2016, at 5:23 am, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> looks a good find Hank.  How do you know the controller is in the motor?   
>  
> "equivalent to 5hp"   right.  But the other specs sounds good.  24v works for me...
>  
> Be interesting to see what they are like if you get one.  Id like to upgrade my aft motor.  This could be the ticket...
>  
> regards
> James
> 
>> On 2 October 2016 at 19:37, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Oops I meant Brian
>> 
>> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>; 
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>; 
>> Subject: Re: [PSUBS-MAILIST] Fw: motor 
>> Sent: Sun, Oct 2, 2016 6:28:50 PM 
>> 
>> Hank,    Those well pumps are multi-stage pumps with all these diffusers ( I think that's what they call them) It's possible that the principle they work on depends on those.  But you still may be able to make it work just as a motor.
>>  
>> Brian
>> 
>> --- personal_submersibles at psubs.org wrote:
>> 
>> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] Fw: motor
>> Date: Sun, 2 Oct 2016 17:22:06 +0000 (UTC)
>> 
>> Alan,
>> I just need travelling motors, no reverse needed.  Maybe I should experiment with submersible well pumps.  I can get 1 hp model for under 200 dollars.  They are pretty much ready to go, the rpm is troubling though at 3400.  I am not sure how they would last running off an inverter also.  Lots to consider.
>> Hank
>> 
>> 
>> On Sunday, October 2, 2016 10:48 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hank,
>> I Assume the seals are just rubber rotary seals like the Minnkota.
>> I have a few Cheap Chinese trolling motors. These ones might be
>> of a better standard. 
>> I would love you to buy one so I can find out how they are constructed,
>> but it is a bit of a gamble. It may be that it is a great find & you can
>> modify the seals easily. 
>> Emile was running the Protruar 2 hp brushless geared thruster on his sub,
>> & said it was a bit noisy. I believe he has now replaced it.
>> I was drawing an extra 1 amp off 50V (50w) on full throttle with oil (10cst)
>> in the housing. So it's not too much of a loss on a 2000W motor.
>> Alan
>> 
>> Sent from my iPad
>> 
>> On 3/10/2016, at 4:23 am, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Alan,
>> You say they have a substandard seal, what does that mean.  Surely they hold the water out.  Would the seal configuration determine wether it is air or oil compensated.  The part I like is the power ratings, forget thrust because that is all crap.  But the amps, watts and volts, you could assume to be true.    Maybe if the seal is poor, it could be upgraded.
>> Hankes might 
>> 
>> 
>> On Sunday, October 2, 2016 5:02 AM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hi Hank,
>> I have done endless Googling looking for brushless trolling motors &
>> saw these two which seem a similar animal
>> http://www.sportrend.com/ArticleShow.asp?ArticleID=397
>> 
>> http://www.sportrend.com/ArticleShow.asp?ArticleID=406
>> 
>> I contacted the supplier as I was wanting to buy the first item, but there were
>> things they told me that didn't seem right, & the freight was very expensive,
>> so I didn't bother.
>> You still have the problem of their sub standard seal. Would love to pull one apart.
>> I am due to put my latest motor & housing in the pool tomorrow.
>> I did some tests running it with & without oil & it's looking good.
>> If it runs well in the pool I will build my final housing (hopefully) with
>> a mechanical seal. 
>> Cheers Alan
>> 
>> 
>> 
>> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
>> Sent: Sunday, October 2, 2016 8:32 AM
>> Subject: [PSUBS-MAILIST] Fw: motor
>> 
>> Hi All
>> Check out this brushless 124lb trolling motor.  What do you think?  it has a controller inside the motor, not sure that can handle pressure.  maybe the controller can be removed and kept inside the sub.  I want to add two motors or more for long distance travel with an independent battery bank.  The current set up is to slow.   I figure this is better than adding a diesel engine.  
>> Hank
>> 
>> On Saturday, October 1, 2016 1:28 PM, xxx xxxxx <mp13 at live.ca> wrote:
>> 
>> 
>> N200-24V 120LB Brushless Electric Boat Trolling Motor Saltwater 42“ shaft
>> 
>> http://www.ebay.com/itm/N200-24V-120LB-Brushless-Electric-Boat-Trolling-Motor-Saltwater-42-shaft-/122118856640?hash=item1c6ed9dfc0:g:uukAAOSwubRXIINJ&vxp=mtr 
>> 
>> 
>> 
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