[PSUBS-MAILIST] Rotary Seal

Tue Dec 2 14:34:44 EST 2014

Thanks Ken,
yes the electronic speed controller is a 3 phase inverter.
I have only recently made a foray in to the World of RC.
Certainly interesting, and some seriously neat little gadgets.
Amazing power from these tiny motors. The number 50 65
on the motor I mentioned corresponds to diameter & length in mm. 
So that motor Is 2" diameter for the 2hp.
Alan

Sent from my iPad

> On 3/12/2014, at 8:01 am, Ken Martindale via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> 
> Thanks for the response.
> 
> It's my understanding that a BLDC motor requires a three phase inverter to
> operate which may be different from a motor controller.
> 
> Assuming you have the right controller BLDC motors are a good choice. They
> should be more efficient and better reliability since no brushes.
> 
> You ought to get around 2 HP if run at maximum.
> 
> Good luck,
> 
> Ken
> -----Original Message-----
> From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
> On Behalf Of Alan via Personal_Submersibles
> Sent: Tuesday, December 02, 2014 1:41 PM
> To: Personal Submersibles General Discussion
> Subject: Re: [PSUBS-MAILIST] Rotary Seal
> 
> Hi Ken,
> I have bought a Turnigy 5065 236kv from Hobby King & have a couple of bigger
> Turnigy motors on order.
> The 80 amp electronic speed controller I have, was bought separately.
> Also bought a unit for programming the ESC & another item that monitors the
> battery  & controls the ESC for testing purposes. Have also bought an
> arduino board for controlling the ESC. The motors are normally operated from
> a radio transmitters reciever.
> Alan
> 
> Sent from my iPad
> 
>>> On 3/12/2014, at 7:12 am, Ken Martindale via Personal_Submersibles
>> <personal_submersibles at psubs.org> wrote:
>> 
>> Alan, Where did you buy the BLDC motor from and do they include the 
>> inverters?
>> 
>> Thanks,
>> 
>> Ken Martindale
>> 
>> -----Original Message-----
>> From: Personal_Submersibles 
>> [mailto:personal_submersibles-bounces at psubs.org]
>> On Behalf Of Alan via Personal_Submersibles
>> Sent: Tuesday, December 02, 2014 1:02 PM
>> To: Personal Submersibles General Discussion
>> Subject: Re: [PSUBS-MAILIST] Rotary Seal
>> 
>> Hi Hank,
>> the high rpm is because of the brushless motors I'm wanting to use.
>> I don't want to use a gearbox because of added expense, power loss, 
>> noise, maintenance & risk of failure. I did look for a gear box 
>> initially but couldn't find a suitable candidate. Looking at other 
>> commercial thrusters I saw that they went up to 3000rpm, so have 
>> bought bigger BLDC motors that are slower revving & are going to use 
>> them at about half their capacity to keep below this.
>> I have one motor & 2 on the way & will do a bit of experimentation 
>> with the revs & different props. Fortunately you can test these in 
>> water as is, so I don't need a can for each option.
>> I am also looking at the motor canister & seal options though.
>> Alan
>> 
>> 
>> 
>> Sent from my iPad
>> 
>>>> On 3/12/2014, at 2:33 am, hank pronk via Personal_Submersibles
>>> <personal_submersibles at psubs.org> wrote:
>>> 
>>> 
>>> Alan,
>>> That is an interesting idea, to reverse them.  What happens when 
>>> there is
>> no internal pressure, maybe nothing.  You would have to look at them 
>> closely to decide.  It has been so long since I saw one, but I think 
>> it is a simple wiper seal.  I have one apart, I can check it out.  I 
>> think that high rpm is going to haunt you.  I thought low rpm and big prop
> was the most efficient.
>> 
>>> Hank
>>> --------------------------------------------
>>>> On Mon, 12/1/14, Alan James via Personal_Submersibles
>>> <personal_submersibles at psubs.org> wrote:
>>> 
>>> Subject: Re: [PSUBS-MAILIST] Rotary Seal
>>> To: "Personal Submersibles General Discussion"
>> <personal_submersibles at psubs.org>
>>> Received: Monday, December 1, 2014, 9:32 PM
>>> 
>>> Hank,what seals
>>> do trolling motors use?Would I be
>>> better to mount them the other way round, as I have a 4psi internal 
>>> overpressure?Alan
>>> 
>>> 
>>> 
>>> 
>>>  From: hank pronk via
>>> Personal_Submersibles
>>> <personal_submersibles at psubs.org>
>>> 
>>> To: Personal
>>> Submersibles General Discussion
>>> <personal_submersibles at psubs.org>
>>> 
>>> Sent: Tuesday,
>>> December 2, 2014 2:54 PM
>>> Subject: Re:
>>> [PSUBS-MAILIST] Rotary Seal
>>> 
>>> 
>>> Alan,
>>> It seems that trolling
>>> motor seals work pretty good, what about them.  Are you planning a 
>>> high rpm?
>>> Hank
>>> --------------------------------------------
>>> On Mon, 12/1/14, Alan James via
>>> Personal_Submersibles <personal_submersibles at psubs.org>
>>> wrote:
>>> 
>>> 
>>> 
>>> Subject:
>>> [PSUBS-MAILIST] Rotary Seal
>>> To:
>>> "Personal Submersibles General Discussion"
>> <personal_submersibles at psubs.org>
>>> Received: Monday, December 1, 2014, 8:44 PM
>>> 
>>> Has anybody got any
>>> recomendations on a rotary
>>> seal type for
>>> my thruster propeller shaft. Looked at the Parker seal pdf & there 
>>> seems a lot of options.I am wanting to oil compensate using the 3 cst 
>>> silicone oil that Carsten recomended,& intend to have about 4 psi 
>>> internal pressure above ambient.ThanksAlan -----Inline Attachment 
>>> Follows-----
>>> 
>>> 
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