1. What is Motor Power Consumption Calculator?

Definition: This calculator estimates the energy consumption of an electric motor in kilowatt-hours (kWh) based on voltage, current, power factor, and operating time.

Purpose: It helps engineers, technicians, and facility managers determine the energy usage of motors for cost analysis and efficiency calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E_{kWh} \) — Energy consumption (kilowatt-hours)
• \( V \) — Voltage (volts)
• \( I \) — Current (amps)
• \( PF \) — Power factor (0 to 1)
• \( t \) — Time (hours)

Explanation: The formula calculates real power consumption by accounting for the phase difference between voltage and current (power factor).

3. Importance of Power Consumption Calculation

Details: Accurate power consumption estimation helps in energy budgeting, cost analysis, and identifying opportunities for energy efficiency improvements.

4. Using the Calculator

Tips: Enter the motor voltage, current draw, power factor (default 0.8), and operating time. All values must be > 0 (except PF which must be between 0 and 1).

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 (typically 0.8-0.95 for motors).

Q2: How do I measure current?
A: Use a clamp meter to measure current while the motor is operating under normal load.

Q3: Why divide by 1000?
A: The division converts watt-hours to kilowatt-hours (kWh), the standard unit for electrical energy billing.

Q4: Does this work for 3-phase motors?
A: For 3-phase motors, use \( \sqrt{3} \times V_{line} \times I_{line} \times PF \times t / 1000 \).

Q5: How can I reduce motor power consumption?
A: Improve power factor with capacitors, use variable speed drives, ensure proper motor sizing, and perform regular maintenance.