[PSUBS-MAILIST] thrusters

Mon Nov 13 17:32:58 EST 2017

 Alan,I won't make a move without your input.  Hank
    On Monday, November 13, 2017, 12:41:21 PM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,the electronic speed controllers (esc) generally don't have a reverse as they are normallyfor planes & helicopters. They can say "reverse" in their specs but this generallyrefers to the ability to program it to go in the other direction. ( big trap)I believe some boat & car escs have a proper reverse function. I have the V esc &Kelly controller that does reverse.Nearly all speed controllers operate off a radio signal from a transmitter. Theyhave a receiver that plugs in to them for receiving this signal. There are unitsaround that plug in to your esc that don't operate off the transmitter. See the robotshop for these. I think also Hobby King has some. You could however use a radiocontrol unit in your sub, if you have the receiver also in your sub & wired to the esc,through a through hull.The speed controllers need to be programmed either with a programming cardor via a complicated system of switching from your transmitter, or via a programloaded to your PC. There are a number of programming parameters & you needto be familiar with the RC terminology to program them. So you are walking head first in to a technological rats nest!BUT... if you buy a unit like the thruster I linked to, you should be able to buy theiresc with the parameters set up ready to go & also some type of joystick input for it.   If you can't buy it, talk to them as they would set you up with what you want for a price. Let me know what you are going to do before you pull the trigger & I will tellyou what I think.Cheers Alan

Sent from my iPad
On 14/11/2017, at 7:43 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,I will but the ready made thrusters, they are dirt cheap.  I will look at a built ROV, but I want it rated for 3,000 feet as it will also ride on Elementary 3000.Hank
    On Monday, November 13, 2017, 10:55:07 AM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,additionally you have to replace the propeller shaft with stainless.It is a press fit into the bell ( outer spinning part) you also need to cut a few circlip grooves.Should mention that there are inrunner & outrunner brushless motors.You are wanting the outrunner as they have a lower rpm for a givensize & more torque. There is an important term "kv" which is no load revsper volt applied. You can have the same size motor with the option ofseveral different kv's due to the motor windings. You want the lowestkv if you are going direct drive. Mine are 6374 motors (63 diameter 74 length)with a 60kv rating.  I had mine especially wound but you can now buy themoff the shelf. There are some pretty cheap rovs that would save you a lot of time& learning, however these little motors are amazing & worth playing with..Alan

Sent from my iPad
On 14/11/2017, at 6:30 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hank,didn't click that this was for your rov project.The brushless motors are a 3 phase motor & need a brushless motorcontroller. 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..7Vso 10S is 37V.They come in two flavours, sensored & uncensored. Sensored have roughstart up & low speed characteristics under load. However if you go withsensored then you have to coat the sensor board, & I'm not sure how thesensors will perform with a coating on them.The company blue robotics has the whole thruster minus the speed controllerfor $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. Asthe 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

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www..psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www..psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20171113/5397724c/attachment-0001.html>