1. What is 3 Phase Motor Power Calculation?

The 3-phase motor power calculation determines the real power consumed by a three-phase AC motor. It accounts for voltage, current, power factor, and motor efficiency to provide accurate power measurement in watts.

2. How Does the Calculator Work?

The calculator uses the 3-phase power equation:

Where:

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

Explanation: The √3 factor accounts for the phase difference in three-phase systems. Power factor represents the ratio of real power to apparent power, while efficiency accounts for energy losses in the motor.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for sizing electrical components, determining energy consumption, calculating operating costs, and ensuring proper motor protection.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is typical power factor for motors?
A: Induction motors typically have power factors between 0.8-0.9 at full load, lower at partial loads.

Q2: How does efficiency affect power calculation?
A: Efficiency accounts for losses (heat, friction). A motor with 90% efficiency converts 90% of electrical input to mechanical output.

Q3: Is this formula for line or phase values?
A: The formula uses line-to-line voltage and line current (not phase values).

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

Q5: Why measure power in motors?
A: Power measurement helps monitor motor health, detect inefficiencies, and calculate energy costs.