1. What is the 3-Phase Motor Power Formula?

The 3-phase motor power formula calculates the real power output of a three-phase electric motor based on voltage, current, power factor, and efficiency. It's essential for sizing motors and electrical systems.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( Voltage \) — Line-to-line voltage (V)
• \( Current \) — Phase current (A)
• \( Power\ Factor \) — Ratio of real power to apparent power (0-1)
• \( Efficiency \) — Motor efficiency (0-1)
• 1000 — Conversion factor from watts to kilowatts

Explanation: The formula accounts for all three phases (√3 factor) and converts the result to kilowatts.

3. Importance of Motor Power Calculation

Details: Accurate power calculation is crucial for proper motor selection, electrical system design, and energy efficiency assessments.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, power factor (typically 0.8-0.95), and efficiency (typically 0.85-0.95). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power (doing work) to apparent power (total power in system). It ranges from 0 to 1, with higher being better.

Q2: What's typical motor efficiency?
A: Standard motors are typically 85-95% efficient, with higher efficiency in larger motors and premium efficiency models.

Q3: Is this formula for line or phase values?
A: The formula uses line-to-line voltage and phase current in a balanced 3-phase system.

Q4: Can I use this for single-phase motors?
A: No, single-phase motors use a different formula without the √3 factor.

Q5: Why divide by 1000?
A: This converts the result from watts to kilowatts (1 kW = 1000 W) for more convenient units.