1. What is Brushless Motor RPM?

The RPM (Revolutions Per Minute) of a brushless motor indicates how fast the motor's shaft rotates. It's determined by the motor's kV rating, applied voltage, and efficiency.

2. How Does the Calculator Work?

The calculator uses the brushless motor RPM equation:

Where:

• \( kV \) — Motor velocity constant (RPM per Volt)
• \( Voltage \) — Applied voltage (V)
• \( Efficiency \) — Motor efficiency percentage (%)

Explanation: The equation accounts for the motor's inherent speed constant (kV), the power supplied (Voltage), and the motor's efficiency in converting electrical power to mechanical rotation.

3. Importance of RPM Calculation

Details: Accurate RPM estimation is crucial for selecting the right motor for an application, predicting performance, and ensuring proper operation within safe speed limits.

4. Using the Calculator

Tips: Enter the motor's kV rating in RPM/V, applied voltage in volts, and efficiency percentage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is kV in brushless motors?
A: kV represents the motor's velocity constant - the RPM the motor will turn per volt applied (with no load and 100% efficiency).

Q2: What are typical efficiency values?
A: Brushless motors typically have 70-95% efficiency depending on quality, load, and operating conditions.

Q3: Does this account for load?
A: No, this is the theoretical no-load RPM. Actual RPM under load will be lower due to voltage drop and efficiency changes.

Q4: How accurate is this calculation?
A: It provides a good estimate, but actual RPM may vary due to temperature, battery condition, and other factors.

Q5: Can I use this for brushed motors?
A: No, brushed motors have different characteristics. This calculator is specifically for brushless motors.