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Motor Power Formula:
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Motor power refers to the electrical power consumed by an electric motor to produce mechanical work. It is calculated using voltage, current, and efficiency to determine the actual power output of the motor.
The calculator uses the motor power formula:
Where:
Explanation: The formula calculates the actual power output by multiplying voltage and current to get apparent power, then multiplying by the motor's efficiency to account for energy losses.
Details: Accurate motor power calculation is essential for proper motor selection, energy efficiency analysis, electrical system design, and determining operational costs in industrial and commercial applications.
Tips: Enter voltage in volts, current in amps, and efficiency as a percentage. All values must be positive numbers (voltage > 0, current > 0, efficiency between 0-100%).
Q1: What is the difference between input power and output power?
A: Input power is the electrical power supplied to the motor, while output power is the mechanical power delivered by the motor. Efficiency represents the ratio between output and input power.
Q2: Why is efficiency important in motor power calculation?
A: Efficiency accounts for energy losses due to heat, friction, and other factors. Without considering efficiency, the calculation would show apparent power rather than actual usable power.
Q3: What are typical efficiency values for electric motors?
A: Standard efficiency motors range from 85-95%, while high-efficiency motors can achieve 95-98%. Efficiency varies with motor size, type, and load conditions.
Q4: Can this formula be used for AC and DC motors?
A: This formula works for DC motors directly. For AC motors, it provides an approximation but may need power factor correction for precise calculations.
Q5: How does motor power relate to torque and speed?
A: Mechanical power output is related to torque and rotational speed by the formula: P = τ × ω, where τ is torque and ω is angular velocity.