1. What is 3-Phase Motor Power?

The 3-phase motor power calculation determines the actual power output of a three-phase electric motor based on voltage, current, and power factor. This is essential for motor sizing, efficiency analysis, and electrical system design.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

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

Explanation: The √3 factor 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 selecting proper motor sizes, determining electrical load requirements, and assessing energy efficiency. It's crucial for system design and maintenance.

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 is a typical power factor for motors?
A: Induction motors typically have 0.85 PF at full load, ranging from 0.2-0.3 at no load to 0.85-0.95 at full load.

Q2: Is this formula for line or phase values?
A: The formula uses line-to-line voltage and line current (not phase values).

Q3: How does this differ from single-phase power?
A: Single-phase uses P = V × I × PF without the √3 factor. Three-phase delivers more power with less conductor material.

Q4: What affects motor power factor?
A: Load conditions (PF drops at partial loads), motor design, and operating speed all influence power factor.

Q5: Can I use this for generator output?
A: Yes, the same formula applies to three-phase generators when calculating output power.