Compare Equal Size Brushless Motors with Very Different Kv's

Here we compare brushless motors that have different Kv values and are the same overall size and power output.

Firstly, we take a look at what limits a brushless motors power output. The limitation of power outputs is directly related to waste heat. Waste heat is generated as a byproduct of creating mechanical power from a brushless motor. Nothing in life is 100% efficient, our brushless motors are typically between 80-90% efficient.

Using a 1750w brushless motor, we can expect 10% or 175 watts of power will be produced in the form of heat. This heat must be dissipated by the motor in order to survive. Physical size of the motor determines how much waste heat the motor can get rid of. Larger motors being able to dissipate more waste heat.

Next we look at how current is responsible for creating waste heat. We are then able to calculate the amount of waste heat we expect in ideal conditions. Even though one motor operates at a much higher current, the motor operating at lower current produces a significant amount of losses through the windings of the motor.

The high voltage of the motor is offset by the low amount of current the motor is able to handle. On the other hand the other motor operates at a very high current but that is offset by the amount of voltage that the motor can handle. At the end of the day, both motors have excellent power potential. It is up to you to select the motor that can deliver this power you need at the correct voltage and RPM.

In general it is difficult for manufactures to place power outputs on brushless motors as the amount of power output can easily change depending on conditions.

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Видео Compare Equal Size Brushless Motors with Very Different Kv's канала RCexplained