[PSUBS-MAILIST] thrusters

[Alan via Personal_Submersibles]

Hank,
didn't click that this was for your rov project.
The brushless motors are a 3 phase motor & need a brushless motor
controller. I am not sure how far you can run the controller from the motor.
You would have to have the controller on the rov & signal wires in the sub.
The motors & controllers are quite cheap through Hobby King or China.
There are mounts that normally come with the motors.
You could buy a 36V option. Hobby motors are classed in S's,  1S is 3.7V
so 10S is 37V.
They come in two flavours, sensored & uncensored. Sensored have rough
start up & low speed characteristics under load. However if you go with
sensored then you have to coat the sensor board, & I'm not sure how the
sensors will perform with a coating on them.
The company blue robotics has the whole thruster minus the speed controller
for $169-
https://www.bluerobotics.com/store/thrusters/t200-thruster/
Well worth the price for the time you'll save.
Cheers Alan

Sent from my iPad

> On 14/11/2017, at 2:10 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> Yes they are low powered, but that works for me because I am not dragging a 300 foot tether.  My tether will be 50 feet.  Do the brushless motors need a special controller?  or will a PWM controller work?  We tend to design and build things to last for an unrealistic life span.  You mentioned a while back about water bearings lasting only 2,000 hrs.  I doubt any Psub will see 2,000 hrs in its entire life time.  If an 119 dollar ROV motor lasts 100 hr, I would get several years out of it.  I am very realistic about spending versus life expectancy.
> Hank
> 
> On Monday, November 13, 2017, 5:08:40 AM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> yes there is a lot of DIY in some of those groups.
> I did run a motor without a housing & things like the magnets got rusty.
> I don't think they would stand up to sea water & any mucky water. As
> the motors would have any thin layers of expoxy / glue sand blasted off.
> From memory the motors were reasonably low powered.
> Alan
> 
> 
> Sent from my iPad
> 
>> On 14/11/2017, at 12:44 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Alan,
>> I joined an ROV group and have found some pretty interesting thruster stuff.  I think you have done the same?  You can buy thrusters that are brushless and built to run in the water with no sealing.  Sounds like they just epoxy the armature and replace the bushings with plastic. 
>> Hank
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> 
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