A little help, PLEASE

[tymeonadime]

I am currently working on a couple MOT (microwave oven transformers) and out of my small collection of five of them, two have shoddy primaries.
I wat to re-wrap them, but having never wrapped a transformer I am at a loss.
I noticed that in my dead MOTs the primary is made of TWO coils, a very short one onfabout ten wraps and a large one of ~+/-90 wraps.
I honestly am not sure if it's intentional or a defect/damage. I have the wire to re wind these coils , but wanted to ask about the short coils and if y'all know rather or not they are intentional.
Sorry for the noob question....
Thanx for Anya and all help.

 

[Einstein]

The short coil will produce a higher voltage output. I would need to see the schematic to know what the second primary coil is there for.

 

[tymeonadime]

I am going to be winding a secondary, to draw high current low voltage.
That being said would the short film be needed?

That doesn't look right.... I mean voltage around <15 and as much amperage as possible. I can and probably will run two or more of these in series. When I am done I will be building a spot welder capable of joining auto body panels. I have a small version using only one MOT that will do nice slugs on thinner metal

 

[tymeonadime]

When I said two coils on the primary, I may have been misleading.
On one INPUT a wire about 14 inches long makes a few wraps and then terminates. It's not physically attached to anything. The the other INPUT is the remainder of the ~121 turns. The end of that one also dead ends. Both faulty primaries are made that way.
I am relatively sure that are purposely made this way, however my knowledge of transformers and coils in general is. lacking to say the least.

 

[tymeonadime]

Another question,

The coils from an AC fan motor, being extracted from their housing, an dbeing supplied with mains current, would it then behave as an electromagnet? OR would I have to rectify the the AC into DC via bridge or uad diode arrangement?