Motor braking.

[Serum]

then what makes the different KV? it's not efficiency. internal resistance varies with different KV's and since some producers of motors give the KV value with the motor as a generator, i don't think your theory is right?

[GriffinRU]

Originally Posted by Serum

then what makes the different KV? it's not efficiency. internal resistance varies with different KV's and since some producers of motors give the KV value with the motor as a generator, i don't think your theory is right?

Kv have nothing to do with resistance, it just happen that with more turns R goes up...
If you have motor 10 meters of copper wire goes through the magnetic flux but in one configuration you have single wire and in another double, the amount of power would be the same. One will have higher voltage another higher current...

Kv is complex number based on Magnet strength, gap, core properties, windings and much more, there are complicated programs dealing with how to calculate or estimate its value and most of them still black magic, in reality it is much easier to measure...

Now, definitely need to run :)
On braking part, there plenty BL motor control algorithms published on line, fined them check them. There is no other magic then shorting phases to stop the vehicle. And none of real R&D engineers will publish here unless he want to loose his job :)

[zeropointbug]

higher numbers of turns, higher inductance, along with the core which it's wound on, and some other factors which may be out of control as far as manufacturer techniques that will probably effect efficiency as well as Kv.