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Old Feb 09, 2012, 12:56 PM
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Carmichael, CA
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Thanks lf, it's nice to see others appreciate the direction I was going with those experiments. It's not about breaking some XXXmph record, it's about squeezing more potential out of existing equipment. Every day some plane out there is moving faster thanks to bigger/heavier equipment and a larger wingloading. However once in a while we find more speed without any negative side effects... like having cake and eating it too. Good stuff indeed!

The calculated Kv is around 3680 RPM/V. At these Kv's doing a no-load test is not wise; the super high rpm's can throw a magnet and destroy a motor before you even get a chance to put a prop on. The actual Kv isn't important anyways, so much as the relative difference in Kv between different winds.

The 6x2T uses what we have been calling a 'half parallel' wind (versus the 'standard wind' you're used to seeing). It actually has 12 continuous turns on each pole, similar to a standard 12T delta. The difference is in the termination... in essence you're taking a standard wind, cutting each phase in half, and soldering them back together in parallel. We don't literally cut the phases in half as the resulting short leads would make scraping/soldering difficult, but we do wind them so we end up with 6 half phases (and we get 12 wires to deal with instead of 6). A picture is worth 1000 words:



That diagram shows what would be a 1.5x2T motor, but I accidentally added one extra turn on the 'E' hammers. Imagine there are 3 physical turns per hammer. When terminated per the legend (Y or D), those 3 turns per hammer become electrically equivalent to 1.5 turns, and the Kv would be the same as a 1.5T standard wind.

Hope this helps,
Kev
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