1. What is Brushless Motor KV?

The KV rating of a brushless motor represents the motor's velocity constant, measured in RPM per Volt (RPM/V). It indicates how fast the motor will spin when a given voltage is applied with no load.

2. How Does the Calculator Work?

The calculator uses the KV formula:

Where:

• \( KV \) — Motor velocity constant (RPM/V)
• \( RPM \) — Revolutions per minute (no load)
• \( Voltage \) — Applied voltage (V)

Explanation: The KV value is calculated by dividing the motor's RPM by the applied voltage under no-load conditions.

3. Importance of KV Calculation

Details: Knowing a motor's KV rating helps in selecting the right motor for your application, whether it's for drones, RC vehicles, or other electric propulsion systems.

4. Using the Calculator

Tips: Enter the motor's RPM (measured under no load) and the applied voltage. Both values must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What does a higher KV value mean?
A: Higher KV motors spin faster at a given voltage but produce less torque. They're better suited for lighter loads or smaller propellers.

Q2: What's a typical KV range for drone motors?
A: Typically between 1000-3000 KV for small drones, while larger drones may use motors in the 200-800 KV range.

Q3: Does KV affect battery selection?
A: Yes, higher KV motors generally require lower voltage (more cells in parallel) while lower KV motors can handle higher voltage (more cells in series).

Q4: Can I measure KV myself?
A: Yes, by measuring the motor's RPM under no load at a known voltage and using this calculator.

Q5: Is KV the only factor in motor selection?
A: No, you must also consider power rating, torque, efficiency, and physical size for your specific application.