1. What is Brushless Motor Power?

The power output of a brushless motor in an electric vehicle is a crucial parameter that determines the motor's performance. It's calculated based on the input voltage, current draw, and the motor's efficiency.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

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

Explanation: The formula calculates the actual mechanical power output by accounting for electrical input and the motor's efficiency.

3. Importance of Power Calculation

Details: Accurate power calculation helps in selecting the right motor for an electric vehicle, predicting performance, and ensuring proper battery and controller sizing.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, and efficiency as a decimal (e.g., 85% efficiency = 0.85). Typical brushless motor efficiencies range from 0.80 to 0.95.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical voltage for EV brushless motors?
A: Common voltages range from 48V for small vehicles to 400V or more for high-performance electric cars.

Q2: How does efficiency affect power output?
A: Higher efficiency means more of the electrical power is converted to mechanical power, with less lost as heat.

Q3: What's the difference between input and output power?
A: Input power is V × I, while output power is V × I × η. The difference represents power lost as heat.

Q4: How does this relate to vehicle performance?
A: Higher power output generally means better acceleration and hill-climbing ability, though gearing and weight also play roles.

Q5: Can I use this for brushed motors?
A: The formula works for any motor, but brushed motors typically have lower efficiency (0.70-0.85).