[PSUBS-MAILIST] Motor Suggestion?

Tue May 15 18:49:23 EDT 2018

 Alan, Wow that is a sexy motor, yikes!  and cheapHank
    On Tuesday, May 15, 2018, 4:40:04 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

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

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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.htmmain 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 speedcontrollers would be compatible.Alan

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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 sureit has good bearings.Cheers Alan
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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 hasthe option in the check box for air or water cooling.   If you have a look at the Dragon submersible, they have gone with somelarge diameter but short motors that resemble the high torque direct drivebicycle hub motors that are popular. On the Dragon submersible it lookslike they have developed thier own propeller so that the thrust isn't hittingthe 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 optionof fitting the motor tightly in to a housing & letting the heat go through thehousing into the water; but the fins on the motor won't let that happen inthis case. Maybe grind them off. It has a temperature sensor so there is theoption 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 electricsurfboards that is rated at 600Whttp://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 relyingon 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 checkwhat axial load the bearings take. In my thruster design I have my motorssuspended between two bearings in the thruster housing that take theforward & 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'sin 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 progressif you want to hold off your thruster build.There is an electric surfboard site that are using large DC motors, that may beof help, but these boards are doing 40kph, so are more like planning boatsrather than submarines that fall in to the work boat category.Good luck.Alan 

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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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