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looking for reference/info on basic electromagnetic coil design Answered

I am an inventor/re-designer and work with a wide variety of technology, tools and materials.  I repair all of my tools myself and have built a number of custom tools and devices. I was a professional auto mechanic for many years, as well as growing up and working as a building contractor for many, many years.  From those and other experiences, I have been exposed to many different coil-based devices.

I have been replacing/repairing coils, coil actuated valves. relays, etc for 30+ yrs, but I've always just replaced the coils with the appropriate new part.

I did rewire a relay last year, for the first time, when I couldn't bring myself to pay $80 for a new coil.  I measured the wire diameter, then carefully uncoiled it, measured the length, then rewound it with the same length of wire.  I figured it was worth the gamble of $4-5 on wire.  It works and controls my 240v air compressor, but it was a bit of a tenuous and nerve wracking job; I had wire ALL over my shop for an hour or two.

I'm finding a need/desire to understand how different voltage coils, ie: 12v DC, 120v AC, 24v DC... are calculated/designed.  Can anyone point me to a resource that will explain the process on a non-electrical engineer basis?

Thanks,

GeoD

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RavensCraft
RavensCraft

7 years ago

Here's a link to a free book on the subject:

http://books.google.com/books?id=9bw3AAAAMAAJ&printsec=frontcover&dq=electromagnet+popular&hl=en&sa=X&ei=ePs_U_PbIqmvsATxgYHQDw&ved=0CD8Q6AEwAzge