These equations are based on

this thread,

here and

here.

How to get Kv by Hz measurement on multimeter on brushless motors

1. Put your motor shaft in a drill chuck.

2. Connect two of the three leads to the multimeter and put it in ACV.

3. Run the drill and measure the ACV.

4. Change multi meter setting to Hz and record the data.

And here is the equation i used {(60 / #No of pole pairs) x Hz}/(ACV x sqrt 2)=Kv

If some people can check the validity of this equation, by running tests on their motors, it would be great.

Note:#No Pole pairs =#No of magnets divided by 2(usually but some motors are not like this)

Note#2: finding appropriate Kv by C4H10 is: No# turns motor 1/motor 2 kv= No# turns motor 2/motor 1 kv