1. What is Motor Power Consumption?

The power consumption of an electric motor is the amount of electrical energy it converts to mechanical energy (and some heat). It's calculated using voltage, current, and power factor for three-phase systems.

2. How Does the Calculator Work?

The calculator uses the three-phase power formula:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Line-to-line voltage in volts (V)
• \( I \) — Current in amperes (A)
• \( PF \) — Power factor (unitless, between 0 and 1)

Explanation: The square root of 3 (≈1.732) accounts for the phase difference in three-phase systems. The power factor represents the ratio of real power to apparent power.

3. Importance of Power Calculation

Details: Accurate power calculation helps in sizing electrical systems, determining energy costs, evaluating motor efficiency, and preventing circuit overloads.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amps, and power factor (typically 0.8-0.95 for motors). All values must be positive (voltage > 0, current > 0, 0 < PF ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between single-phase and three-phase calculation?
A: For single-phase systems, omit the √3 factor (P = V × I × PF). Three-phase systems are more efficient for larger motors.

Q2: What is a typical power factor for motors?
A: Induction motors typically have 0.85 PF at full load, lower at partial loads. Synchronous motors can achieve 1.0 PF.

Q3: How does this relate to horsepower?
A: 1 HP ≈ 746 watts. To convert, divide wattage by 746 (e.g., 3730W = 5HP).

Q4: Why is actual power consumption sometimes higher?
A: This formula gives real power. Motors also draw reactive power (VARs) which affects total apparent power (VA).

Q5: How can I improve motor efficiency?
A: Use motors at their rated load, maintain proper voltage, ensure good power factor, and consider high-efficiency models.