1. What is the 3 Phase Motor Power Formula?

The 3-phase motor power formula calculates the real power consumed by a three-phase AC motor. It takes into account the line voltage, current, and power factor of the motor.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( P \) — Real power in watts
• \( V \) — Line voltage in volts
• \( I \) — Line current in amps
• \( PF \) — Power factor (unitless, between 0 and 1)
• \( \sqrt{3} \) — Constant for 3-phase systems (≈1.732)

Explanation: The formula accounts for the phase relationship in three-phase systems and the power factor which represents the ratio of real power to apparent power.

3. Importance of Power Calculation

Details: Accurate power calculation is crucial for sizing electrical components, determining energy consumption, and assessing motor efficiency.

4. Using the Calculator

Tips: Enter line voltage in volts, line current in amps, and power factor as a decimal (typically between 0.8 and 1.0). 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 actual work) to apparent power (product of voltage and current). It ranges from 0 to 1.

Q2: Why is √3 used in the formula?
A: The √3 accounts for the phase difference in three-phase systems, converting between line and phase quantities.

Q3: What's a typical power factor for motors?
A: Induction motors typically have power factors between 0.85 (at full load) and 0.2 (at no load).

Q4: Does this calculate real or apparent power?
A: This calculates real power (watts). Apparent power (VA) would omit the power factor term.

Q5: Can this be used for single-phase motors?
A: No, single-phase motors use P = V × I × PF without the √3 factor.