[PSUBS-MAILIST] Motor Suggestion?

[Alan via Personal_Submersibles]

Hi James,
just had a look at the motor & it's a bit of a beast.
Looks like an in-runner. It says elsewhere it is cooled with a fan but has
the option in the check box for air or water cooling.
   If you have a look at the Dragon submersible, they have gone with some
large diameter but short motors that resemble the high torque direct drive
bicycle hub motors that are popular. On the Dragon submersible it looks
like they have developed thier own propeller so that the thrust isn't hitting
the body of the thruster.
The cooling system on your motor isn't going to work if you put it in a water/
pressure proof enclosure. With the in-runner the coils are on the outside
& can dissipate their heat through the can, so there would be the option
of fitting the motor tightly in to a housing & letting the heat go through the
housing into the water; but the fins on the motor won't let that happen in
this case. Maybe grind them off. It has a temperature sensor so there is the
option of monitoring the temperature & running it at a suitable power. Some 
escs can drop the power automatically if the temperature gets too high.
The motor is very expensive. There is this Maytech motor designed for electric
surfboards that is rated at 600W
http://www.michobby.com/product/electric-surfboard-skateboard-e-bike-brushless-motor-8085-160kv-motor/
It is an 8085 160 kv out-runner & priced at $188- US. I am wanting to test 
one of these but will test my smaller motors first to get a better idea of what 
kv winding I should have. Maytech will wind to your specifications; I think you 
have some knowledge of the RC world so you will understand this.
This motor being an out-runner has the coils on the inside & so I am relying
on oil for cooling. 
You will need to replace the propeller shaft with a longer stainless shaft.
Your motor is designed to drive a pulley & you would have to check
what axial load the bearings take. In my thruster design I have my motors
suspended between two bearings in the thruster housing that take the
forward & reverse axial load.
Alien Power in England have some large brushless motors & motor controllers.
I think he's a small operator & he will respond to questions. Got an idea he's
in Birmingham.
I am focussed on my thruster testing at the moment, but could not put a 
time on when I will test the 8085 motor. You can keep an eye on my progress
if you want to hold off your thruster build.
There is an electric surfboard site that are using large DC motors, that may be
of help, but these boards are doing 40kph, so are more like planning boats
rather than submarines that fall in to the work boat category.
Good luck.
Alan 




Sent from my iPad

> On 16/05/2018, at 3:51 AM, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> hi all
> 
> I am thinking about what motor I should use for my main thruster on
> Skadoc.  Its got to be big.
> 
> All these ideas are just thoughts at the moment, as I am working on
> battery pods now.
> 
> Expecting delivery of pipe from UK today.
> 
> So I have time to think how motor configuration is going to work.
> 
> What do you guys think about this motor choice here?  As a possibility.
> 
> https://www.miromax.lt/en/m-6/c-39/c-45/product-500-bldc_motor_hpm-5000b_-_nominal_power_5-86kw
> 
> I have room for 12 x12v batteries, so all voltages are a possibility.
> 
> I am also thinking of running an inverter and working at 120v AC.
> investigating this.
> 
> Regards
> James
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