1. What is Brushless Motor RPM?

The RPM (Revolutions Per Minute) of a brushless motor is determined by the input voltage, motor's Kv rating, and gear ratio. This calculation helps in designing and optimizing motor performance in various applications like drones, RC vehicles, and industrial machinery.

2. How Does the Calculator Work?

The calculator uses the brushless motor RPM equation:

Where:

• \( Voltage \) — Input voltage to the motor (V)
• \( Kv \) — Motor velocity constant (RPM per volt)
• \( Gear\ Ratio \) — Ratio between motor and output shaft

Explanation: The Kv rating indicates how many RPM the motor will turn per volt with no load. The gear ratio reduces this speed while increasing torque.

3. Importance of RPM Calculation

Details: Accurate RPM calculation is crucial for proper motor selection, performance prediction, and system design. It affects speed, torque, and efficiency of the entire system.

4. Using the Calculator

Tips: Enter voltage in volts, Kv in RPM per volt, and gear ratio as a number (e.g., 3:1 ratio is entered as 3). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is Kv rating in brushless motors?
A: Kv is the motor velocity constant representing RPM per volt with no load. Higher Kv means higher speed but lower torque.

Q2: How does gear ratio affect performance?
A: Higher gear ratios reduce output speed but increase torque. Lower ratios provide higher speed with less torque.

Q3: Is this RPM calculation accurate under load?
A: This calculates theoretical no-load RPM. Actual RPM under load will be lower due to efficiency losses and load torque.

Q4: What's a typical Kv range for brushless motors?
A: Kv varies widely from <100 RPM/V for large motors to >3000 RPM/V for small, high-speed motors.

Q5: How does battery voltage affect RPM?
A: RPM is directly proportional to voltage. Doubling voltage (with proper motor) doubles the RPM.