[PSUBS-MAILIST] Motor Suggestion?

Tue May 15 18:39:40 EDT 2018

James,
just checked the Golden Motors site for the price on your
HPM 5000B motor & it's US $446- plus $120 freight ( for me in NZ)
Alan

Sent from my iPad

> On 16/05/2018, at 10:16 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> James,
> a bit more info; it is made by Golden Motors, China.
> https://www.goldenmotor.com/frame-bldcmotor.htm
> main site...
> https://www.goldenmotor.com/
> There is a lot more info here along with accessaries.
> Not sure what freight would cost you, but the price is better & the speed
> controllers would be compatible.
> Alan
> 
> Sent from my iPad
> 
>> On 16/05/2018, at 9:37 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 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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