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Input Power Formula:
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Input power calculation determines the electrical power required by a motor to produce a specific mechanical output power, accounting for energy losses due to inefficiencies in the motor's operation.
The calculator uses the fundamental power efficiency formula:
Where:
Explanation: The formula accounts for energy losses in the motor system, where not all electrical input power is converted to useful mechanical work.
Details: Accurate input power calculation is essential for proper motor sizing, electrical system design, energy consumption estimation, and cost analysis in industrial and commercial applications.
Tips: Enter output power in watts or kilowatts, and efficiency as either a decimal (0.0-1.0) or percentage (0-100). The calculator automatically detects the efficiency format and provides appropriate results.
Q1: What is the difference between input and output power?
A: Input power is the electrical power consumed by the motor, while output power is the mechanical power delivered by the motor shaft.
Q2: How do I know if my efficiency value is decimal or percentage?
A: Decimal efficiency ranges from 0.0 to 1.0 (e.g., 0.85), while percentage efficiency ranges from 0 to 100 (e.g., 85%). The calculator automatically handles both formats.
Q3: What are typical motor efficiency values?
A: Modern electric motors typically have efficiencies ranging from 85% to 97%, depending on motor size, type, and quality.
Q4: Why is input power higher than output power?
A: Input power is always higher due to energy losses in the form of heat, friction, and other inefficiencies in the motor system.
Q5: Can this calculator be used for all motor types?
A: Yes, the fundamental principle applies to all electric motors, though specific efficiency values may vary by motor type and operating conditions.