1. What is Brushless Motor Power Calculation?

The brushless motor power calculation determines the mechanical power output of a brushless DC motor based on electrical input and motor efficiency. It helps in motor selection and performance evaluation.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

• \( P \) — Power output in watts
• \( V \) — Input voltage in volts
• \( I \) — Current draw in amps
• \( \eta \) — Motor efficiency (0-1)

Explanation: The equation calculates the mechanical power output by accounting for the motor's electrical input and its conversion efficiency.

3. Importance of Power Calculation

Details: Accurate power calculation is crucial for selecting the right motor for an application, determining battery requirements, and evaluating system performance.

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 valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's typical efficiency for brushless motors?
A: Good quality brushless motors typically have 80-90% efficiency (0.8-0.9), but this varies with load and motor quality.

Q2: How does power relate to torque?
A: Power (watts) = Torque (Nm) × Angular Velocity (rad/s). Higher power at a given RPM means higher torque.

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

Q4: Why is my calculated power lower than expected?
A: This could indicate voltage sag under load, incorrect efficiency estimation, or measurement errors.

Q5: Can I use this for brushed motors?
A: The same formula applies, but brushed motors typically have lower efficiency (60-75%).