1. What is Brushless Motor RPM?

Brushless motor RPM (Revolutions Per Minute) is the rotational speed of the motor's output shaft. It's determined by the input voltage, motor's Kv rating (RPM per volt), and any gear reduction applied.

2. How Does the Calculator Work?

The calculator uses the brushless motor RPM equation:

Where:

• \( Voltage \) — Input voltage to the motor (V)
• \( Kv \) — Motor's velocity constant (RPM per volt)
• \( Gear\ Ratio \) — Ratio of motor speed to output speed (e.g., 3:1)

Explanation: The equation calculates the no-load RPM of a brushless motor based on its Kv rating, then applies any gear reduction to determine the final output RPM.

3. Importance of RPM Calculation

Details: Knowing the output RPM is crucial for selecting the right motor and gear ratio for your application, whether it's for drones, RC vehicles, or industrial applications.

4. Using the Calculator

Tips: Enter the battery voltage in volts, motor Kv rating in RPM per volt, and gear ratio (enter 1 for direct drive). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is Kv rating?
A: Kv is the motor's velocity constant, representing how many RPM the motor will turn per volt with no load.

Q2: What is a typical Kv range?
A: Kv varies widely from <100 RPM/V for large motors to >3000 RPM/V for small, high-speed motors.

Q3: Is this the actual RPM under load?
A: No, this calculates no-load RPM. Actual RPM under load will be lower due to voltage drop and motor efficiency.

Q4: How does gear ratio affect RPM?
A: Higher gear ratios (e.g., 3:1) reduce output RPM but increase torque. Lower ratios (e.g., 1:1) maintain higher RPM.

Q5: Can I use this for brushed motors?
A: While the concept is similar, brushed motors have different characteristics and this calculator is optimized for brushless motors.