Model with brushless motor has a few hundred to 23000 KV value is low, high to 56000, every increase 1 v, it represents the voltage, the value of speed increase. For the brushless motor, this value is a constant.
motors KV value: the speed of the motor (No-load)X = KV value voltage; For example KV1000 it under 10 v voltage of motor speed,No-load)Is 10000 RPM.
for the same size of brushless:
the winding number of motor, low KV value, maximum output current is small, but large torque;
less number of turns of the motor winding, high KV value, maximum output current is big, but small torque;
single from KV value, not can evaluate the quality of the motor with KV high and low, also can not to measure motor pulling force is strong with KV, because different KV value have different applicable occasion:
* low voltage (7. 4v）
KV value is low, because of the low speed, match with small reduction ratio and large propeller, ascension by large load current, the output is high power;
high KV value, due to the high speed, match with large reduction ratio and the smaller the propeller, under the condition of meet the power output, to reduce the load, and avoid excessive current;
* high voltage environment (11. 1 v)
low KV value, under the environment of the voltage can achieve high speed, torque is good also, ideal. Need to match and large reduction ratio and the smaller the propeller, under the condition of meet the power output, to reduce the load, and avoid excessive current;
KV value high speed is too high in this environment, in order to avoid too much electricity, as far as possible to reduce the load. With its high speed, with the word of Yu Han fan engine is appropriate.
7. 4 v and 11. V is for example, is a common small level. Brushless voltage range is very wide, amazing performance.
（Kv can only explain motor idling condition, specific performance depends on the actual situation of the load. )
of course, brushless motor with propeller, batteries, electric has a close relationship. brushless motor manufacturers
