[PSUBS-MAILIST] Alan's new motors

[Alan James via Personal_Submersibles]

Thanks Hank,the BLDC (brushless DC) motors have 3 large power wires coming from them.If you energized the right 2 you would get a momentary partial movement of the motor. In a "sensored" BLDC you usually have 3 hall effect sensorsthat send position feedback to a microcontroller, which turns on mosfets,(switches), & these send power through to the correct 2 of the 3 wiresin sequence.There are various integrated circuits you can buy that do the job of receivingthe signals from your speed controller & the hall sensors, & then switch themosfets on at the correct time. The wiring diagrams are provided for all of this;however I will need to work on the mosfet circuitry & power input to them, plusa lot more, like over current protection & reversing.It's amazing what has happened with the internet over the last 20 years. Iwouldn't have had a foggy clue about any of this without it. If you don'tunderstand anything there are oodles of online videos & resourses.Cheers Alan



      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Tuesday, August 16, 2016 12:17 AM
 Subject: Re: [PSUBS-MAILIST] Alan's new motors
   
Alan,Not many people would attempt to do what you are doing, it is  impressive!  What happens when you run the motor direct off the battery without the controller.  Hank
 

    On Monday, August 15, 2016 3:47 AM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hi Hank,thanks for the enquiry. Yes have finally got my lathe up & goingafter 2 months. The thruster motors are running a bit rough on both myKelly sensored controllers & my sensorless controllers. Althoughthey are reaching the correct rpm for the volts applied.There is very little out there in the way of brushless, sensored orunsensored DC motor controllers, that will run up to 40 amps & 48Vwith reverse. (& not cost the earth). I am coming to terms with the factthat I may have to make my own controller. Have just bought a frequencygenerator & oscilloscope to help with the process & to try & find whythe motors are running rough on the Kelly controller.I am appreciating the fact that I'm learning a bit more, but not happywith the lack of progress.Cheers Alan


      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, August 15, 2016 10:43 AM
 Subject: [PSUBS-MAILIST] Alan's new motors
  
Alan,How are your motors progressing?  You get your lathe working?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


  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20160815/c8f4d399/attachment.html>