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I have something that everybody that I ask to clear this riddle for me come with transformer theory!

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+1 vote
I have something that everybody that I ask to clear this riddle for me come with transformer theory!

I have some experience in making my own transformers so I am not a complete uninformed about them. I was taught that to work better have less hyteresis the core is laminated and THE LAMINATIONS ISOLATED WITH varnish from each other. This is also the case for motors. even the humble toy motors are laminated . The latest trend is now to weld these transformers where the E and I plates meet. What I did discover is that they tend to be bigger physically than the unwelded kind and that they run hotter under load.
asked Nov 10, 2013 by KROKKENOSTER (220 points)

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Best answer

Good question and I think that I know the answer.

For best results, the laminations are interleaved (one inserted in one direction and the next in the opposite direction).  To reduce cost because transformers are labor intensive, the laminations may be grouped as pairs rather than singly.  To reduce labor even further, they may be grouped at up to about five laminations at a time.  The drawback is higher leakage flux and higher magnetizing current--not a big issue at power line frequencies.

The ultimate cheapness is to stack all the E laminations together and weld to a bar of all the I laminations stacked together.  The drawback is further increased leakage flux, higher magnetizing current, and higher eddy currents that are induced into the core because they are no longer fully insulated from eachother--in other words, efficiency goes down and temperature rise increases.  While this is an acceptable manufacturing method, performance suffers.
answered Nov 11, 2013 by j-keith (12,800 points)
selected Nov 12, 2013 by KROKKENOSTER

Thanks a lot this was then exactly the losses that I did think it was but the professors that I asked did not know this answer themselves. I was looking for this answer for over thirty years

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