[PSUBS-MAILIST] Rotary Seal

Tue Dec 2 14:01:25 EST 2014

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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