RZ/RD 350 & Misc. 2-Stroke Tech BBS

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PostPosted: Sun Nov 12, 2017 12:18 pm 
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Joined: Mon Jul 03, 2017 7:01 am
Posts: 30
Hi
After frying my stator (as described here viewtopic.php?f=3&t=15095)
I have started playing With the idea of rewinding the stator myself. After a quick search both here and on Google I think it should be within reach.

Anyway, I found that the charging part of the stator has a somewhat non-symmetrical layout that had me puzzled. That is - it has 14 charging coils where I was expecting to find a factor of 3 number of coils. However the spacing was phase 1,2,3...1,2,3 and so on untill it ended with 1,2 making up a total of 14 coils. I discovered that the number of windings was approximately 40 for each coil and in 3 cases it was only 20 windings/turns on the coi. When I added them all up, I found that phase 1 and 3 had 160 turn totalt distributed through its coils, but phase 2 had 180!?

My initial thoughts was that the total number of windings should have been equal between all three phases, even if the layout is a non-symmetrical distribution.

I am therefore asking you all if I shuold leave it like this - or should I compensate when rewinding and loose 20 turns on phase 2 to make them all 160? Or is there some though behind these from the factory perhaps? Its beyound me for sure at this point, and I have no idea if it has been rewound before.
If anyone has any data to support the number of windings etc I would be pleased to hear it.

Check out my stator disassembly notes inn pptx format here https://1drv.ms/p/s!ArCvt5JQQSh2sxLCkCriNj4_-9SQ

Thanks for reading
Kjell


Last edited by kjellz on Sat Nov 18, 2017 6:57 pm, edited 1 time in total.

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PostPosted: Sun Nov 12, 2017 3:26 pm 
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Joined: Tue Jul 23, 2013 2:16 pm
Posts: 96
RM stator rewinds coils and are very good about technical questions like what you are asking. You might want to give them a call.


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PostPosted: Thu Jan 18, 2018 3:02 pm 
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Joined: Mon Jul 03, 2017 7:01 am
Posts: 30
I now finished my dyi rewind. Wasn't as bad as first thought.
I decided not be that picky on the total number of windings and replicated roughly the original setup.~40 turn pr core.
The hardest part was to wind it tight enough, and I could clearly not get it as tight as factory.
I plan tp compensate with a generous amount of transformer grade varnish in several coatings.

The ignition coils were left as is.

I got about 0,7-0.8 ohm for each phase when finished. Quite pleased with myself at this stage, but note that this is before testing :smt001
Now I will revert back to some other more mechanical issues to get ready for spring.
Thanks


Attachments:
File comment: all three phases
Stator 3phases finished.jpg
Stator 3phases finished.jpg [ 167.2 KiB | Viewed 301 times ]
File comment: 1st phase wound
Stator 1st phase.jpg
Stator 1st phase.jpg [ 159.08 KiB | Viewed 301 times ]
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PostPosted: Thu Jan 18, 2018 7:34 pm 
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Joined: Mon Mar 03, 2014 8:44 pm
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Location: Calgary, Alberta, Canada
You are an absolute animal for attempting this...kudos. Interested in knowing if it works.
More windings = more voltage, not sure about amperage though.

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PostPosted: Thu Jan 18, 2018 9:47 pm 
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Joined: Sat Oct 10, 2009 4:33 am
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Location: Sydney
I agree with Rory, what a great thing to do yourself. Im keen to know how this works out, it sounds like we might all be doing this soon as the price of wire is cheap enough compared to the cost of a Pro rewind.

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PostPosted: Fri Jan 19, 2018 8:24 am 
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Joined: Sat Nov 26, 2005 11:44 am
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Location: Wolfenb├╝ttel, Germany
There's good chance that it'll work.
People in Germany did that in the past and if you compensate the weak point (aka epoxy the loose windings) it should do the job.

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Martin


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