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Hi Allen, I hope others will also chip in. For my part, difference between brushed and brushless would be great. Personally I have very little knowledge of brushless motors so would appreciate your explanation there.
I was interested in your comment the Kt = 1/Kv. That seemingly simple relationship must have an explanation that eludes me.
Also, I was interested in the calculation of efficiency from the basic parameters as you described. This seems to open the possibility of using a motor as a generator to measure an engine power output, an application where an estimate of motor efficiency is clearly required. Or do parameters change when the motor is being driven as a generator? I probably skipped a step or two there.