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Three-Phase AC Motor Power Formula:
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Motor power consumption refers to the electrical power input required to operate an electric motor. For three-phase AC motors, this is calculated using voltage, current, and power factor measurements to determine the actual power being consumed.
The calculator uses the three-phase AC power formula:
Where:
Explanation: This formula calculates the real power consumption of a three-phase AC motor, accounting for the phase relationship between voltage and current through the power factor.
Details: Accurate power calculation is essential for energy management, electrical system design, motor selection, and determining operational costs. It helps in sizing electrical components and optimizing energy efficiency.
Tips: Enter line voltage in volts, line current in amperes, and power factor (typically between 0.7-0.95 for motors). All values must be positive numbers 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 indicates how effectively electrical power is being converted into useful work output.
Q2: How does this differ from single-phase power calculation?
A: Single-phase uses P = V × I × cos(φ) without the √3 factor. Three-phase systems are more efficient for the same power delivery.
Q3: What are typical power factor values for motors?
A: Induction motors typically have power factors between 0.7-0.9 at full load, decreasing at lighter loads. Synchronous motors can achieve unity power factor.
Q4: Can this formula be used for DC motors?
A: No, DC motor power is simply P = V × I since there's no power factor consideration in DC systems.
Q5: How accurate is this calculation for real-world applications?
A: This provides theoretical power input. Actual consumption may vary due to motor efficiency, load conditions, and voltage fluctuations.