KV values are defined

Brushless motor KV value is defined as the speed / V, meaning one volt input voltage increases, the increased idle speed brushless motor speed value.From this definition, we can know, the brushless motor voltage input to the motor idling speed is to follow a strict linear proportional relationship.

Meaning KV value

Significance of the brushless motor is not only strictly linear description of the motor speed and voltage proportional to, the performance of the motor also has a broad representation of the.

Brushless motor used friends have this feeling, the same level (OD) of the brushless motor, and the inner rotor outer rotor energized compare, you will find a large number of external rotor motor torque, to "hard" some,the inner rotor motor torque is slightly smaller, to "soft" some, a look at the motor parameters, external rotor motor KV value of more than 800, the inner rotor motors over 1000 to more than 2000.Look at the speed of the inner rotor motor speed significantly higher than the external rotor motor.In fact, these features are related with KV value, as defined by KV values to explain, brushless motor idling speed, KV value is multiplied by the input voltage, which explains why the inner rotor motor speed is higher than the exterior rotormotor.

      On the torque characteristics of view, the KV value reflects a sense motor torque performance, take external rotor motor, the motor idling speed like a general, but with the load (eg propellers), its speed dropped to idling speed of60% -70%, but to get the same level of internal rotor motors to test, then, the speed with a load of only 30% -40% of its no-load speed, which clearly reflects the difference between the two torque characteristics of the motor,with a load capacity of the inner rotor motor is relatively low, in order to meet the torque acting within its own rotor motor required deceleration, increased by the current, voltage remains unchanged, so the output power of the motor increases, the inner rotor motorsThis torque characteristic is also reflected in the specific application, before a lot of light foam fixed-wing aircraft, initially with the inner rotor brushless motor, but for the sake of torque characteristics, airplane propellers are not directly connected to the motor (notdirect drive), but adds a reduction gear set, is to improve the torque performance of the inner rotor motor.

The same series with the dimensions of a brushless motor, KV values are also able to distinguish the characteristics of the motor, such as B3674 inner rotor motor, a KV value is 1860, a KV value is 2075, that the first motor torque should be larger, the peakCurrent work on a relatively small number; the second motor technology is higher, but the torque characteristics would be worse than the first motor, the peak current is greater.

Meaning KV brushless motor, be sure to let you benefit

      Some basic knowledge model KV brushless motor brushless 1-2 one thousand low-value, high 5-6 Qian, he said that the voltage is increased by 1 volt, the speed increase of the value, for brushless thisValue is a constant

      For the same kind of brush sizes for: &

      Many winding turns, KV value is low, the maximum output current is small, but large torque

      Winding turns less, KV value, the maximum output current, but small torque

      Single from KV value, the motor can not evaluate the quality, because different KV values are for different occasions:

      Low voltage environment (7.4v)

      KV value is low due to the low speed, good with a smaller reduction ratio and a larger propeller, by a large load to improve the current, high power output;

      KV high value, due to the high speed, good with a greater reduction ratio and a smaller propeller, to meet the conditions of output power, to reduce the load, to avoid excessive current;

      High voltage environment (11.1v)

      KV low value, in this voltage environment can achieve higher speeds, torque is also good, is ideal.Need to meet a greater reduction ratio and a smaller propeller, to meet the conditions of output power, to reduce the load, to avoid excessive current;

     KV high value, speed is too high in this environment, in order to avoid excessive current, to minimize the load.Use of its high speed for the engine is suitable for ducted fan.

     7.4v and 11.v just an example, is commonly used in small levels.Brushless voltage range is very wide, amazing performance.