[PSUBS-MAILIST] pump motor

[glen brown via Personal_Submersibles]

Alan
Nice and compact.Im sure control is possible.
Glen

On Sun, Jul 26, 2015 at 7:09 PM, Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Glen,
> have run this one in the pool with prop & no housing.
>
> http://www.hobbyking.com/hobbyking/store/__18184__Turnigy_Aerodrive_SK3_6374_149kv_Brushless_Outrunner_Motor.html
> It's tiny at 3hp. The number 6374 means 63mm diameter x 74mm long.
> I am intending to oil compensate it. There is nothing to the motor, but
> the electronic speed controllers are complex & don't usually have reverse.
> there are issues caused by long wire runs from battery to esc that need
> addressing.
> Alan
>
>   ------------------------------
>  *From:* glen brown via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Monday, July 27, 2015 3:33 AM
>
> *Subject:* Re: [PSUBS-MAILIST] pump motor
>
> 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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