[PSUBS-MAILIST] Speed and Direction Control for Small Brushed Motors

Sat Jul 10 10:52:01 EDT 2021

 Nice setup Rick, no extra electronics needed with the linear actuator.
Jon

    On Friday, July 9, 2021, 04:35:10 PM EDT, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

  accuator.MOVJonI posted this awhile back and am not sure if you saw it but this is what I have chosen to do with my steering for the aft motor on my K sub as I didn't like the way the yoke was in the way of the person laying down. I have only dry tested it and I like how it works but have yet to test its performance in the water. I am also using a gauge in the sub that shows the position of the motor as I have this same set up on my sailboat and it really works well. I can't find the video of the steering one but I am using the same principle to open and close the flood valve for the VBT which I have attached.Hope this helpsRick
On Fri, Jul 9, 2021 at 3:36 AM Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 I've thought about that as well but haven't got there yet.  A simple potentiometer connected to the rudder would be enough to give feedback regarding its position if I can come up with a way of waterproofing it.  I recall Alan trying to deal with this years ago and not sure if he did find a solution or not.  In terms of returning to center position, just not there yet.  If anyone has suggestions, I'm open.
Jon

    On Friday, July 9, 2021, 09:11:47 AM EDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

  Nice work Jon; well documented and helpful.  I have found that to make fly by wire work for control surfaces, you need a position sensor and/or  have the ability for the control surface to return to a neutral position through the joystick sending out a centralized position signal.  What are you planning to use on your boat for rudder feedback?
Thanks for this excellent contribution to site.
Cliff 
    On Thursday, July 8, 2021, 11:07:50 PM CDT, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 For a couple of weeks I've been toying with the idea of a "fly-by-wire" approach to rudder control.  I really don't like the idea of manually operated foot control found in K-subs and while thinking about how I might implement a hand control I started delving into a fly-by-wire solution after seeing a youtube video on a totally unrelated topic demonstrating small motor controllers.
I've converted a 5 volt hand-held power screwdriver into a 1-ATM housing partially filled with oil for lubrication purposes.  The torque on these small things are quite impressive and I believe may be strong enough to handle a rudder.  Even if it isn't, I can still use the motor for something else.
I combined a small motor controller that can handle 10 amps, with a TEENSY microprocessor, and a joystick which allows me to control motor spin direction, and speed.  It works amazing and total cost was about $60.  If you've got a purpose for a small electric motor with speed/direction control, you might find this project interesting.  I've written a paper and also included software, both available at PSUBS.ORG > PSUBS Community > Community Projects > Speed and Direction Control for Small Brushed Motors.
Direct link:http://www.psubs.org/community/projects/moto-1.pdf

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