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?