Motor combo Question, rotor/ kv

[TheShaughnessy]

Here is the question. I recently had the insulation on an aquacraft 2030kv motor melt and the wires touched and shorted it out. I also had a 1800 kv aq motor laying around but the rotor isn't any good on it. So i took the rotor from the 2030 kv motor and put it in the can of the 1800 kv motor. I tested it on the bench and it spooled up good and sounded like a brushless motor sounds. This time i put 3 layers of shrink wrap around each motor wire and then silicon where the exit the motor. (a little trick i picked up from PropperChopper) I'm going to test the motor in water later on today. So the question is what effects the motors Kv is it the rotor or the can? Do i have a 1800 kv, a 2030 kv or something unknown? I don't have one of those nifty kv meters so its not like i can check it that way. Does anybody know what i created?

[m4a1usr]

The windings and type (delta or Y) determine a motors Kv. Although increasing and decreasing the air gap between the rotor and steel laminations will change the Kv slightly as well. Since your using the 1800Kv can its probably more approximate to that. If the rotor magnets are in the same location in comparison on the 2 rotors and they have the same diameter chances are pretty good its an 1800kv now.

John

[Make-a-Wake]

Yeah.....i'm sayin' 1800kv too.

[TheShaughnessy]

after running it today it seemed more like an 1800. Lost my shaft at the stub though. so much for that new 40x57/3 prop I got.