Motor Absorbed Power Calculator
Quickly determine a motor’s absorbed (input) power using voltage, current, and power factor. Ideal for engineers analyzing motor efficiency and load performance.
motor absorbed power calculator:
The Motor Absorbed Power Calculator is used to determine the input power that is required by the electricity supply to the motor. The actual electrical energy utilized is the one that is absorbed before the losses in both mechanical output and efficiency. With single-phase motors, P = V × I × PF, and with three-phase motors, P = √3 × V × I × PF. This instrument enables engineers to evaluate the motor load, measure the power consumption as and predict the cost of energy. Just place the voltage, current, and power factor, and the power absorbed in watts or kilowatts is obtained.
Work & Installation — Input to Output Summary
Work Principle: The absorbed power represents the electrical input power supplied to the motor. It differs from the output mechanical power due to efficiency and losses (stator, rotor, friction, windage).
Installation (Setup): Create three input fields for Voltage (V), Current (I), and Power Factor (PF). For three-phase systems, include a dropdown to select “Single Phase” or “Three Phase.”
Input: User enters voltage, current, and PF values.
Calculation:
Single phase: \( P = V \times I \times PF \)
Three phase: \( P = \sqrt{3} \times V \times I \times PF \)
Convert to kilowatts (kW) if needed by dividing watts by 1000.
Output: Display results in watts (W) and kilowatts (kW), with optional apparent power (VA) and efficiency comparison if The mechanical output is known.
Testing and Final Adjustments
To validate the calculator, test known cases.
Example 1: Single-phase, V = 230 V, I = 10 A, PF = 0.9 → P = 230 × 10 × 0.9 = 2070 W.
Example 2: Three-phase, V = 400 V, I = 5 A, PF = 0.8 → P = 1.732 × 400 × 5 × 0.8 ≈ 2771 W.
Verify that unit conversions work properly and display rounding to two decimals. Include form validation so blank or non-numeric inputs show a clear warning. Make the layout mobile-responsive and easy to interpret with labels like “Input Voltage (V)”, “Line Current (A)”, and “Power Factor (PF)”. For professional tools, add optional “Efficiency” and “Output Power” fields to show calculated mechanical output and losses. Perform testing on multiple browsers (Chrome, Edge, Firefox) to ensure consistent rendering and calculation precision before deployment.
Frequently Asked Questions - Motor Absorbed Power Calculator:
What is motor absorbed power?
It is the total electrical power drawn by the motor from the supply before efficiency losses.
How do I calculate absorbed power?
Use P=V×I×PF for single-phase or P=√3×V×I×PF for three-phase motors.
What is the unit of absorbed power?
The standard unit is watts (W) or kilowatts (kW).
What is the difference between absorbed and output power?
Absorbed power is electrical input, while output power is mechanical energy delivered at the shaft.
Why is power factor important in absorbed power?
It determines the real power component; lower PF means higher current for same output.
Can I use this calculator for DC motors?
Yes, for DC motors use P=V×I since PF is not applicable.
What if my power factor is unknown?
You can assume 0.8 for typical induction motors under normal load.
How do I convert absorbed power to horsepower?
Divide watts by 746 to get horsepower (hp).
Does absorbed power include losses?
Yes, it includes stator, rotor, friction, and windage losses before mechanical output.
Why calculate absorbed power?
It helps analyze motor loading, energy consumption, and efficiency in industrial systems.
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