Home
Back
Motor Power Formula:
| From: | To: |
Motor power represents the rate at which electrical energy is converted into mechanical energy. It is a crucial parameter in determining the performance and efficiency of electric motors in various applications.
The calculator uses the motor power formula:
Where:
Explanation: The formula calculates the actual mechanical power output by accounting for the electrical input power and the motor's efficiency in converting electrical energy to mechanical energy.
Details: Accurate motor power calculation is essential for proper motor selection, energy efficiency analysis, system design, and determining the suitability of a motor for specific applications.
Tips: Enter voltage in volts, current in amps, and efficiency as a decimal between 0 and 1 (e.g., 0.85 for 85% efficiency). All values must be positive numbers.
Q1: What is the difference between input power and output power?
A: Input power is the electrical power consumed (V × I), while output power is the mechanical power delivered, which is input power multiplied by efficiency.
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, you would calculate input power rather than useful mechanical output power.
Q3: What are typical efficiency values for electric motors?
A: Small motors: 50-70%, Medium motors: 75-85%, Large motors: 85-95%. High-efficiency motors can reach 95-97% efficiency.
Q4: Can this formula be used for AC and DC motors?
A: For DC motors, yes directly. For AC motors, this gives apparent power; true power requires considering power factor for AC circuits.
Q5: How does motor power relate to torque and speed?
A: Mechanical power = Torque × Angular Speed. This relationship helps determine the motor's ability to perform work at different speeds.