1. What is 3 Phase Motor Power Calculation?

The 3-phase motor power calculation determines the real power consumed by an electric motor in a three-phase system. This is essential for sizing equipment, calculating energy costs, and evaluating motor performance.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( P \) — Real power (watts)
• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amperes)
• \( PF \) — Power factor (0 to 1)
• \( Eff \) — Motor efficiency (0 to 1)

Explanation: The formula accounts for the three-phase system (√3 factor), voltage, current, and the motor's power factor and efficiency.

3. Importance of Power Calculation

Details: Accurate power calculation helps in proper motor selection, energy cost estimation, electrical system design, and identifying potential energy savings.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amps, power factor (typically 0.8-0.95), and motor efficiency (typically 0.8-0.95 for most motors).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between real power and apparent power?
A: Real power (kW) is the actual power consumed, while apparent power (kVA) includes reactive power. This calculator gives real power.

Q2: How does power factor affect motor performance?
A: Lower power factor means more current is needed for the same real power, increasing losses and reducing system capacity.

Q3: What's typical motor efficiency?
A: Standard motors are 85-95% efficient, with higher efficiency in larger motors and premium efficiency models.

Q4: Can I use this for single-phase motors?
A: No, single-phase motors use P = V × I × PF × Eff (without the √3 factor).

Q5: How does this relate to motor pricing?
A: Higher power motors generally cost more, but efficiency and features also affect price. This calculation helps compare operating costs.