Does anybody want to read a tech paper I’m working on?
Every once in a while I solder things together and watch what happens. Several years ago, I was fussing with making a tachometer work, and generally getting frustrated because none of the filters I was using worked. Then I hit upon an idea that avoids the filtering altogether, and feeds the noisy mess right into the microcontroller, which happily detects what it needs, ignoring the rest. I was very surprised it worked - more specifically, surprised it didn’t come up with a new way to give me even stranger data. Instead, the tachometer readings settled down and matched every independent cross-check I could throw at it. Ever since then the tachometer has been THE most reliable number on my data logging system.
Years later it has sunk in that I may have made something unusual, or at least worth writing about.
Since I’ve never written a tech journal paper before, this has been something of a learning exercise for me, but undaunted I’ve given it a try. I’m thinking of a few journals that this might suit and I plan to submit to. If you have suggestions, I’d like to hear them. The one I prefer has an 8-page limit, and if you look at my paper you’ll see that it’s 9 pages long. So if you have any suggestions, the best ones will be how to cut it down!!
Tachometer, polyphase circuit, microcontroller, noise, harmonics, filtering, programming, wind turbine
A sensorless digital tachometer is described that uses phase rotation in a polyphase electrical machine (two or more phases) to determine its speed of rotation, ignoring most characteristics of the output AC waveform. No additional device such as an encoder is required to obtain an accurate measurement of rotational speed. The technique needs no input filtering, and requires only input voltage dividers to condition the input signals from each phase to a programmable IC microcontroller. An application of the polyphase tachometer is described.