1. What is Motor Power Calculation?

The motor power calculation determines the electrical power consumed by a three-phase AC motor in kilowatts (kW). This is essential for sizing electrical systems, determining energy consumption, and assessing motor efficiency.

2. How Does the Calculator Work?

The calculator uses the three-phase power formula:

Where:

• \( P \) — Power in kilowatts (kW)
• \( V \) — Line-to-line voltage in volts (V)
• \( I \) — Current in amperes (A)
• \( PF \) — Power factor (unitless, between 0 and 1)

Explanation: The formula accounts for the three-phase power relationship, converting the result from watts to kilowatts by dividing by 1000.

3. Importance of Power Calculation

Details: Accurate power calculation is crucial for electrical system design, energy efficiency assessments, motor selection, and determining operating costs.

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 numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is being converted into useful work. It ranges from 0 to 1.

Q2: What's typical power factor for motors?
A: Induction motors typically have power factors between 0.8 and 0.95 at full load, lower at partial loads.

Q3: Can I use this for single-phase motors?
A: No, this calculator is for three-phase systems. Single-phase power is calculated as P = V × I × PF / 1000.

Q4: Why measure motor power?
A: Power measurement helps assess motor efficiency, detect problems, and calculate energy costs.

Q5: How accurate is this calculation?
A: It provides theoretical power consumption. Actual power may vary due to efficiency losses, voltage fluctuations, and other factors.