Questions? Looking for parts? Parts for sale? or just for a chat,

The WD Motorcycle forum

WD Motorcycle forum
Start a New Topic 
Author
Comment
Checking resistance of armature and field separately?

Further to my charging problems, I took the dynamo apart for visual inspection, but could not find any sign of a disconnection or so. I would like to know what would the right way be of check the resistance of the rotor and of the field, separately.
Thanks.

Re: Checking resistance of armature and field separately?

Hello Michael.

Armature testing:

https://www.youtube.com/watch?v=VXV4p3m9TwY

The field resistance is just the resistance between the 2 terminals of it,
When at least one side is disconnected from anything.

Best regards,
Noam.

email (option): noam10@gmail.com

Re: Checking resistance of armature and field separately?

Thanks Noam, that's exactly what I was looking for.
Any idea regarding the field inside? Took it also out from the dyno.
Shabat Shalom.

Re: Checking resistance of armature and field separately?

Hi

Just looked back through your postings.

You mentioned that you sent the dynamo off to a UK specialist for refurbishment.

Would it be too expensive to put the dynamo back together, post it back and get them to check/fix it free of charge (no pun intended)?

As a general question, cannot any local re-winding firm check/fix it? For example any local firm that re-winds starter motors (vintage or not) should be able to check/fix it.

All you need to tell them is that it should be putting out around 12 to 14 volts.

I share your pain!

Regards

Pat

email (option): sacombsashtrees@hotmail.com

Re: Checking resistance of armature and field separately?

http://www.dynamoregulatorconversions.com/field-coil-testing-and-winding.php

The above link may help re testing the field coil.

email (option): sacombsashtrees@hotmail.com

Re: Checking resistance of armature and field separately?

Hi Patrick,
I appreciate your kind help.
Well, those dinosaurs who where fixing those old items back in the old days are mostly gone now, here in Israel. The only one left in my area quoted me via phone conversation with 1000 NIS as for beginning (That’s almost 220 English Pounds) and he also gave me the feeling that he’s doing me a favor… I do understand him though; He has to make his living and in other words he is actually telling me that he has no time for these things, as his workshop is full with urgent modern jobs he has to do, committed to the workshops/ garages he’s servicing.
Regarding sending back – the overhauling took place in the UK about 10 years ago, so not relevant and I am quiet sure it is me to blame (better said- the regulator) who destroyed the dynamo.
So, I am asking for help over here and thanks to people like you, Noam and all other grate guys I get it. You guys are vey patient.
Thank you all again and have a lovely weekend.
Michael

Re: Checking resistance of armature and field separately?

Hello dear Michel,

Regarding your question "Any idea regarding the field inside?"
I did not fully understand...
There is a field cil, looks like a "squarish" doughnut, wrapped in fabric,
located inside of the dynamo body, at the middle of the barrel, more or less,
attached to the inside wall,
Held by a piece of metal in the middle of it, with one screw (from the outside)
For the "Short" dynamo, and 2 screws for the "long" dynamo.

2 wires are coming out of it, and are poing to the brush board. ("Terminal plate")
The resistance has to be measured between these 2 terminals,
When at least one of them is not connected to anything.
The reading should be as stated in the other post.

Where are you from in Israel?
I know that there is David Hadadi, located in 20, Ben-Avigdor st', Tel-Aviv that does these windings.

https://www.webpage.co.il/biz/28391

If you need any help, please e-mail me or send your phone No.

Cheers,
Noam.

email (option): noam10@gmail.com

Re: Checking resistance of armature and field separately?

2.8 Ohms for the E2L (60W)
3.2 Ohms For the E3N (40W)

email (option): noam10@gmail.com

Re: Checking resistance of armature and field separately?
Nieuwe pagina 1