1. What is Brushless Motor Output Power?

The output power of a brushless motor is the mechanical power delivered by the motor shaft. It's calculated from the electrical input power (voltage × current) multiplied by the motor's efficiency.

2. How Does the Calculator Work?

The calculator uses the brushless motor power equation:

Where:

• \( P \) — Output power (watts)
• \( V \) — Input voltage (volts)
• \( I \) — Input current (amps)
• \( \eta \) — Motor efficiency (0-1)

Explanation: The equation accounts for the conversion of electrical power to mechanical power, with efficiency representing energy lost as heat.

3. Importance of Power Calculation

Details: Knowing the output power helps in selecting the right motor for an application, determining battery requirements, and ensuring the motor operates within its thermal limits.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, and efficiency as a decimal between 0 and 1 (e.g., 85% efficiency = 0.85). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's typical efficiency for brushless motors?
A: Most quality brushless motors have 80-95% efficiency under normal operating conditions.

Q2: How does power relate to torque and RPM?
A: Mechanical power (watts) = Torque (Nm) × Angular Velocity (rad/s), where rad/s = RPM × π/30.

Q3: Should I measure voltage under load?
A: Yes, for accurate results measure voltage while the motor is running at the desired load.

Q4: Why does efficiency vary?
A: Efficiency depends on load, RPM, temperature, and motor design. Peak efficiency typically occurs at 70-80% of maximum load.

Q5: Can I use this for brushed motors?
A: The equation works for any motor type, but brushed motors typically have lower efficiency (70-85%).