[PSUBS-MAILIST] pump motor

[glen brown via Personal_Submersibles]

Alan
What BLDC motor  are you considering,are you planing on filling it with oil
ect?
Regards Glen

On Sat, Jul 25, 2015 at 12:49 PM, glen brown <gbrown091 at gmail.com> wrote:

>  Alan
> Thanks for the info,I am going the bore hole pump way for sure I will give
> feed back .
>
> I think you guys have a chance today with the game we have made 8 changes
> to our team,
> Glen
>
> On Fri, Jul 24, 2015 at 10:49 PM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Glen,
>> I am just about to get back in to a project using an
>> RC BLDC motor as a thruster. Have a 3 hp one with
>> a lot of starting torque that spins a Yamaha 4 hp prop
>> without gearing.
>> With regard to your pump; you will either need a suitable
>> electronic speed controller with reverse, or you could build an H bridge
>> circuit on the appopriate 2 of the 3 wires from the speed controller
>> to the BLDC motor.  There are normally 3 wires from the controller to
>> the motor, the central one is for position feedback & the other two can
>> be
>> switched around happily for reversing the polarity.
>> You will need some sort of delay so you are not wacking it in to reverse
>> while it's still rotating.
>> Ken is an expert on this.
>> Hank had some great low priced DC pumps that he posted links to a while
>> back.
>> Alan
>>
>>   ------------------------------
>>  *From:* glen brown via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Saturday, July 25, 2015 2:55 AM
>> *Subject:* Re: [PSUBS-MAILIST] pump motor
>>
>> Hank
>> I think using a set in either direction could work, the motor is not that
>> long . Another option could be be rotating 180 deg.
>> With all the issues that the trolling motors have I think its something
>> I'm going to have to look into  plus our dollar exchange rate is at 13 to 1
>> at present.I wonder what size and pitch prop one would use?
>> Glen
>>
>>
>>
>>
>> On Fri, Jul 24, 2015 at 4:33 PM, hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Glen,
>> I looked at it real hard, the motors are well compensated with a rubber
>> bladder at the bottom.  They are also sleek and made from SS.  The problem
>> is, they are not reversible, as far as I could figure.  Maybe someone knows
>> a way to reverse them.   If you can find a way to reverse them, please let
>> me know.  I would use them in a flash!
>> Hank
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>
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