3 Phase Motor Watts Calculator

3 Phase Motor Power Formula:

\[ P = \sqrt{3} \times V \times I \times PF \times Eff \]

Voltage (V):

Current (I):

Power Factor (PF):

(0 to 1)

Efficiency (Eff):

(0 to 1)

Power Output (P):

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1. What is 3 Phase Motor Power Calculation?

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

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

\[ P = \sqrt{3} \times V \times I \times PF \times Eff \]

Where:

\( P \) — Power in watts (W)
\( V \) — Line-to-line voltage (V)
\( I \) — Current in amperes (A)
\( PF \) — Power factor (unitless, 0 to 1)
\( Eff \) — 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, and efficiency accounts for energy losses in the motor.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for proper motor sizing, energy efficiency assessment, electrical system design, and determining operational costs.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amperes, power factor (typically 0.8-0.95 for motors), and efficiency (typically 0.85-0.95). All values must be positive numbers within their respective ranges.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between real power and apparent power?
A: Real power (watts) is the actual power consumed, while apparent power (VA) is the product of voltage and current. The ratio is the power factor.

Q2: Why is efficiency important in the calculation?
A: Efficiency accounts for energy losses (heat, friction) in the motor. The output power is always less than the input power due to these losses.

Q3: What's a typical power factor for motors?
A: Induction motors typically have power factors between 0.8 and 0.9 at full load, lower at partial loads.

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

Q5: How does voltage variation affect motor power?
A: Power is directly proportional to voltage. A 10% voltage drop results in about a 10% power reduction.