Enter the voltage applied to a motor and its no-load speed constant to determine the RPM (Revolutions Per Minute).
Voltage to RPM Formula
The following formula is used to calculate the RPM of a motor given the voltage and no-load speed constant.
RPM = V * Kv
Variables:
- RPM is the revolutions per minute of the motor
- V is the voltage applied to the motor (V)
- Kv is the no-load speed constant of the motor (RPM/V)
To calculate RPM, multiply the voltage (V) by the no-load speed constant (Kv). The no-load speed constant is a characteristic of the motor and represents the RPM per volt under no load conditions.
What is Voltage to RPM?
Voltage to RPM is a way to determine the speed of a motor based on the voltage applied to it. This is particularly useful for electric motors in RC cars, drones, and other electronic devices where the motor speed needs to be controlled or predicted based on the input voltage.
How to Calculate RPM from Voltage?
The following steps outline how to calculate the RPM from Voltage.
- First, determine the voltage (V) applied to the motor.
- Next, determine the no-load speed constant (Kv) of the motor, which is usually provided by the manufacturer.
- Use the formula RPM = V * Kv to calculate the RPM.
- Finally, enter the values into the calculator above to verify the result.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Voltage (V) = 12V
No-Load Speed (Kv) = 1000 RPM/V
