3 Phase Motor Output Calculator

3-Phase Motor Output Power Formula:

\[ \text{Output Power} = \sqrt{3} \times \text{Voltage} \times \text{Current} \times \text{Power Factor} \times \text{Efficiency} \]

Voltage:

volts

Current:

amps

Power Factor:

dimensionless

Efficiency:

Output Power:

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1. What is 3-Phase Motor Output Power?

3-Phase motor output power represents the actual mechanical power delivered by the motor shaft. It's calculated from electrical input parameters and accounts for motor efficiency and power factor.

2. How Does the Calculator Work?

The calculator uses the 3-phase motor output power formula:

\[ \text{Output Power} = \sqrt{3} \times \text{Voltage} \times \text{Current} \times \text{Power Factor} \times \text{Efficiency} \]

Where:

\( \sqrt{3} \) — Constant for 3-phase systems (approximately 1.732)
\( \text{Voltage} \) — Line-to-line voltage (volts)
\( \text{Current} \) — Line current (amps)
\( \text{Power Factor} \) — Ratio of real power to apparent power (0-1)
\( \text{Efficiency} \) — Motor efficiency expressed as decimal (0-1)

Explanation: The formula calculates the actual mechanical power output by considering the electrical input power and accounting for losses through the efficiency factor.

3. Importance of Output Power Calculation

Details: Accurate output power calculation is essential for motor selection, system design, energy efficiency analysis, and proper sizing of mechanical components connected to the motor.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, line current in amps, power factor (0-1), and efficiency percentage (0-100%). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between input and output power?
A: Input power is electrical power consumed, while output power is mechanical power delivered. Output power = Input power × Efficiency.

Q2: Why is power factor important in motor calculations?
A: Power factor indicates how effectively the motor converts electrical power to useful work. Lower power factors mean higher reactive power and less efficient operation.

Q3: What are typical efficiency values for 3-phase motors?
A: Modern 3-phase motors typically have efficiencies between 85-95%, with higher efficiency in larger motors and premium efficiency models.

Q4: Can this calculator be used for single-phase motors?
A: No, this calculator is specifically for 3-phase motors. Single-phase motors use a different calculation formula without the √3 factor.

Q5: How does voltage variation affect motor output?
A: Motors are designed for specific voltages. Significant voltage variations can affect performance, efficiency, and may damage the motor over time.