1. What is 3-Phase Motor Energy Calculation?

The 3-phase motor energy calculation determines the electrical energy consumed by a three-phase motor over a period of time, accounting for voltage, current, power factor, and motor efficiency.

2. How Does the Calculator Work?

The calculator uses the 3-phase power formula:

Where:

• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amperes)
• \( PF \) — Power factor (0 to 1)
• \( Eff \) — Motor efficiency (0 to 1)
• \( h \) — Operating time (hours)

Explanation: The √3 factor accounts for the phase relationship in 3-phase systems. The calculation converts watt-hours to kilowatt-hours by dividing by 1000.

3. Importance of Energy Calculation

Details: Accurate energy calculation helps in estimating operating costs, evaluating motor efficiency, and planning energy consumption for industrial applications.

4. Using the Calculator

Tips: Enter line-to-line voltage in volts, current in amperes, power factor (typically 0.8-0.95), motor efficiency (typically 0.85-0.95), and operating hours. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is 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.

Q2: How do I find motor efficiency?
A: Check motor nameplate or manufacturer specifications. Standard efficiency motors are typically 85-95% efficient.

Q3: Is this calculation valid for all 3-phase motors?
A: Yes, for balanced 3-phase systems. For unbalanced loads, each phase should be calculated separately.

Q4: Why include efficiency in the calculation?
A: Efficiency accounts for energy losses in the motor, giving true electrical energy consumption rather than mechanical output.

Q5: How can I reduce energy consumption?
A: Use higher efficiency motors, maintain proper voltage levels, ensure good power factor, and avoid oversizing motors.