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Motor Power Formula:
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Motor power calculation determines the electrical power consumption of an electric motor in kilowatts (kW). This is essential for proper motor sizing, energy efficiency analysis, and electrical system design.
The calculator uses the motor power formula:
Where:
Explanation: The formula calculates real power by multiplying voltage, current, and power factor, then converts from watts to kilowatts by dividing by 1000.
Details: Accurate motor power calculation is crucial for selecting appropriate motor sizes, ensuring electrical system compatibility, optimizing energy consumption, and preventing overload conditions.
Tips: Enter voltage in volts, current in amperes, and power factor (typically 0.8-0.95 for AC 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 indicates how effectively electrical power is being used, with higher values (closer to 1) indicating better efficiency.
Q2: What are typical power factor values for motors?
A: Most AC induction motors have power factors between 0.8 and 0.95 at full load. Power factor decreases at lighter loads.
Q3: How does this differ from mechanical power?
A: This calculates electrical input power. Mechanical output power is lower due to motor efficiency losses (typically 80-95% for standard motors).
Q4: When should three-phase power calculation be used?
A: For three-phase motors, use \( P = \frac{\sqrt{3} \times V \times I \times \cos\phi}{1000} \) where V is line-to-line voltage.
Q5: How accurate is this calculation for motor sizing?
A: This provides electrical power consumption. For proper motor sizing, consider mechanical load requirements, starting torque, and service factor in addition to electrical parameters.