1. What is Drone Motor KV Rating?

The KV rating of a drone motor represents the motor's velocity constant, indicating how many RPM (revolutions per minute) the motor will turn per volt applied, with no load. It's a key specification for selecting motors for your drone.

2. How Does the Calculator Work?

The calculator uses the KV equation:

Where:

• \( RPM \) — Motor revolutions per minute (measured)
• \( Voltage \) — Applied voltage (V)
• \( KV \) — Motor velocity constant (rpm/V)

Explanation: The KV rating shows how fast the motor will spin when a certain voltage is applied. Higher KV means more RPM per volt.

3. Importance of KV Rating

Details: KV rating helps match motors to propellers and battery voltage. Lower KV motors with larger props are better for heavy lift, while higher KV motors with smaller props are better for speed.

4. Using the Calculator

Tips: Measure motor RPM at a known voltage (no load), enter values to calculate KV. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical KV range for drone motors?
A: Typically 100-3000 KV, with racing drones using higher KV (2000+) and cinematography drones using lower KV (100-1000).

Q2: Does KV affect battery choice?
A: Yes, higher KV motors need lower voltage (cell count) to stay within safe RPM limits, while lower KV motors can handle higher voltages.

Q3: How does KV relate to torque?
A: Generally, lower KV motors produce more torque at the expense of speed, while higher KV motors produce less torque but higher speeds.

Q4: Can I use this for brushed motors?
A: The KV concept applies, but brushed motors typically don't specify KV ratings as they're less efficient and predictable than brushless motors.

Q5: How accurate is the calculated KV?
A: Accuracy depends on precise RPM and voltage measurements. For best results, use a tachometer and calibrated power supply.