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SD8 - rewinding for 28V

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digidocs

Joined: 04 Dec 2013
Posts: 59

Posted: Wed Aug 25, 2021 8:13 pm Post subject: SD8 - rewinding for 28V

I have a SD8 alternator (14V) on the shelf and a 28V single alternator system in the hangar.



Under the guise of education and recreation, I wonder if I could disassemble the SD8 and rewind it with more turns of smaller wire to make it more appropriate for a 28V application?



Conceptually this is a simple idea, but I wonder if in practice I will have issues like losing strength in the magnets when I disassemble the alternator, or it being impossible to remove the existing windings without damage to the stator, etc.



Any and all input welcome.

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nuckolls.bob(at)aeroelect
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Posted: Thu Aug 26, 2021 8:35 am Post subject: SD8 - rewinding for 28V

At 11:13 PM 8/25/2021, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "digidocs" <junk(at)dcarr.org>



 I have a SD8 alternator (14V) on the shelf and a 28V single alternator system in the hangar.



 Under the guide of education and recreation, I wonder if I could disassemble the SD8 and rewind it with more turns of smaller wire to make it more appropriate for a 28V application?



 Conceptually this is a simple idea, but I wonder if in practice I will have issues like losing strength in the magnets when I disassemble the alternator, or it being impossible to remove the existing windings without damage to the stator, etc.



 Any and all input welcome. 	


   It is possible/practical to rewind the SD8 stator

   for other performance goals. There are no risks to

   the hardware for having disassembled it.



   You basically need to double the number of turns

   per pole and use smaller wire so that the increased

   turns do not overrun the available space.



   Count the turns on each pole as it's disassembled

   and note the wire routing between poles for

   installing the new winding.



   Remember that cross section of the wire varies

   as square of diameter. So for 1/2 the area, you'll

   need wire on the order of 0.7x the diameter of

   the original.



   Good luck! Let us know what you discover.



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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