Ever wonder how to convert brushless motor kv to rpm? In ths article will tell you a sample formula, But before that you should know what’s the KV and RPM meaning? Therefore, the main parameters of motor constant explained to you first.
What’s the KV meaning?
KV is the main parameter of motor, it is measure the speed of motor. 1Kv is 1 revolution per minute meaning that apply 1 volt to an unloaded motor. KV is in proportion to Volt, 2 volts will rotate twice value of KV.
KV is related to the torque level of the motor, what’s the torque? It’s another concept of motor. For rough conclusion, a low kv motor can produce higher torque with bigger prop and can carry more volts at less currents for your drone, and vice versa.
Take an example,
What’s the PRM meaning?
RPM the full name is revolution per minute. It’s used as a measure of revolution of the motor, the most intuitive formulation is that how fast the motor will totate.
Brushless Motor KV To RPM
How to calculate motor RPM? First you should know how many factors impact the value of RPM? In theory, in order to get RPM value just need to know only 2 factors, there are KV value and battery voltage.
RPM = Motor KV Racing * Battery Voltage
For your convenience, below is auto formula to get the value of PRM, just need to enter the kv rating of motor and your battery voltage.
The best way to measure RPM
In fact, many factors affect the test result, such as battery discharge rating, motor windings, propeller loading and motor efficiency etc.
In order to more accurately meausre the PRM, I suggest that use the professional tool to help. Below product is a great tool to measure the RPM of motors. A handy tool for checking the PRM of Brushless Motors. Click the image to purchase it.