- Joined Sep 24, 2015
Since the E and the I are two different parts they can vibrate when 50 or 60Hz or higher frequencies are used with them. If they are bolted together with side brackets they can still vibrate significantly so often the entire construction is vacuum varnished. Welding is another way to stop the two from vibrating without the need for vacuum varnishing. A third method is to run a stainless steel band around the entire outside of the construction and use a crimp buckle to keep it banded tightly although varnishing after that is still a good idea for the audible frequencies.Thanks for all the input. Just a curiosity question, that's all. Wondering when one type would be favored over another. And the EI core - - - I've seen two types: One where all the E's are stuck together and the I's are welded over the ends. The other was an EI laminated with a reversed IE (EI backwards)to build up the core. The first - I've seen lots of those in microwave oven transformers. The second, I've seen them in smaller transformers. I would imagine the second method is more labor intensive (or machine labor intensive).
Probably. That type is just a big inductor so ignoring the resistive component, AC voltage and current will be 90 degrees out of phase.. There is another type of choke that has two parallel windings. The supply is connected to the pair on one end of the windings and the load on the other. The DC current flows in opposite directions in the pair so the magnetic fields from the conductors cancel each other out and the core does not saturate. Any AC interference also cancels out.So am I thinking of a choke? A coil of wire turned around an iron core?
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