1. What is DC Motor Full Load Amps?

Full Load Amps (FLA) is the current a DC motor draws when operating at its rated power and voltage. It's a critical parameter for sizing circuit protection and conductors.

2. How Does the Calculator Work?

The calculator uses the basic DC power formula:

Where:

• \( I \) — Current in amperes (A)
• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)

Explanation: This simple calculation assumes 100% efficiency. Real-world motors will draw slightly more current due to efficiency losses.

3. Importance of FLA Calculation

Details: Knowing the full load current is essential for proper circuit design, breaker sizing, and preventing motor overheating. Undersized wiring can lead to voltage drop and motor damage.

4. Using the Calculator

Tips: Enter the motor's rated power in watts and operating voltage in volts. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How does efficiency affect the calculation?
A: For more accurate results, divide by motor efficiency (e.g., if 85% efficient: \( I = P/(V \times 0.85) \)).

Q2: What's typical FLA for common DC motors?
A: Small hobby motors: 1-5A, automotive starters: 50-200A, industrial motors: varies widely based on horsepower.

Q3: How does starting current compare to FLA?
A: DC motors can draw 2-3 times FLA during startup due to lack of back EMF.

Q4: What about brushless DC motors?
A: The same formula applies, but power should be the electrical input power, not mechanical output.

Q5: How to account for voltage drop?
A: Use actual operating voltage at motor terminals, not nominal supply voltage, if significant voltage drop is expected.