[PSUBS-MAILIST] Motor Suggestion?

Tue May 15 17:37:31 EDT 2018

James,
just thought you are probably putting it in your hull & driving a 
pulley on the propeller shaft. So ignore the last email lol.
I would think you could get something a lot cheaper, but make sure
it has good bearings.
Cheers Alan

Sent from my iPad

> On 16/05/2018, at 9:28 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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