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 (RPM per volt), and gear ratio. This calculation helps in selecting the right motor and gearing for your application.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

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

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: Calculating motor RPM is essential for matching motor performance to your application requirements, whether for drones, RC vehicles, or industrial applications.

4. Using the Calculator

Tips: Enter the battery voltage, motor Kv rating, and gear ratio. For direct drive (no gear reduction), use a gear ratio of 1.

5. Frequently Asked Questions (FAQ)

Q1: What affects actual motor RPM?
A: Actual RPM may be lower due to load, efficiency losses, and voltage drop under load.

Q2: How do I find my motor's Kv rating?
A: Kv is specified by the manufacturer. It's often printed on the motor or available in the product specifications.

Q3: What's a typical Kv range for brushless motors?
A: Kv ranges from about 100 RPM/V for large, slow motors to over 5000 RPM/V for small, fast motors.

Q4: How does gear ratio affect performance?
A: Higher gear ratios reduce RPM but increase torque. Choose based on your speed and torque requirements.

Q5: Can I use this for brushed motors?
A: The calculation works similarly, but brushed motors typically have lower Kv ratings and different efficiency characteristics.