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Motor Power Formula (Single-Phase):
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Motor power calculation determines the electrical power consumed by a motor based on voltage, current, and power factor. This is essential for electrical system design, energy efficiency analysis, and motor selection.
The calculator uses the single-phase motor power formula:
Where:
Explanation: The formula calculates real power consumption, accounting for the phase difference between voltage and current through the power factor.
Details: Accurate motor power calculation is crucial for proper circuit sizing, energy consumption analysis, motor efficiency evaluation, and electrical system safety compliance.
Tips: Enter voltage in volts, current in amps, and power factor (typically 0.8-0.95 for motors). All values must be positive, with power factor between 0 and 1.
Q1: What is power factor and why is it important?
A: Power factor represents the ratio of real power to apparent power. It accounts for phase differences between voltage and current in AC circuits and affects energy efficiency.
Q2: Is this formula for single-phase or three-phase motors?
A: This calculator uses the single-phase formula. For three-phase motors, the formula is \( P = \sqrt{3} \times V \times I \times PF \).
Q3: What are typical power factor values for motors?
A: Induction motors typically have power factors of 0.8-0.9 at full load, dropping to 0.2-0.3 at no load. Synchronous motors can achieve unity power factor.
Q4: How does motor power relate to mechanical power?
A: Electrical power input is greater than mechanical power output due to losses (copper losses, iron losses, friction, windage). Efficiency = (Output Power / Input Power) × 100%.
Q5: When should I use this calculation?
A: Use for motor sizing, circuit breaker selection, wire sizing, energy consumption analysis, and troubleshooting motor performance issues.