There are still a lot of DC drive motive power out there. If I'm not mistaken AC drives came of age in locomotive power with the advent of power inverters that work by altering AC sinewaves to the motors. Couple these with computer control (that's working correctly) and the whole system works to maintain programmed parameters hundreds if not thousands of times a minute based on feedback from a zillion sensors. This continually tweeks everything from fuel feed to wheel slip to maintain peak efficency. The engineer basically blows the horn at grade crossings and catches h**l if his train is 2 milliseconds late. DC drive is very powerful but woefully inefficent.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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