Motor Power Calculation Torque Rpm

Motor Power Formula:

\[ P = T \times RPM \times \frac{2\pi}{60} \]

Power (P):

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1. What is Motor Power Calculation?

Motor power calculation from torque and RPM is a fundamental engineering formula used to determine the mechanical power output of rotating machinery. This calculation is essential for motor selection, performance analysis, and system design.

2. How Does the Calculator Work?

The calculator uses the motor power formula:

\[ P = T \times RPM \times \frac{2\pi}{60} \]

Where:

\( P \) — Power in watts (W)
\( T \) — Torque in newton-meters (Nm)
\( RPM \) — Rotational speed in revolutions per minute
\( \pi \) — Mathematical constant (3.1416)

Explanation: The formula converts rotational mechanical power from torque and angular velocity to linear power units. The factor 2π/60 converts RPM to radians per second.

3. Importance of Power Calculation

Details: Accurate power calculation is crucial for proper motor sizing, energy efficiency analysis, system performance evaluation, and ensuring mechanical components can handle the generated power.

4. Using the Calculator

Tips: Enter torque in Nm and RPM in revolutions per minute. Both values must be positive numbers. The calculator will provide power output in watts.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between mechanical and electrical power?
A: Mechanical power refers to the actual work output from the motor shaft, while electrical power is the input power consumed. This calculator determines mechanical power output.

Q2: Can this formula be used for all types of motors?
A: Yes, this fundamental formula applies to all rotating machinery including AC motors, DC motors, engines, and turbines when calculating mechanical power output.

Q3: How do I convert the result to horsepower?
A: Divide the result in watts by 745.7 to get horsepower (1 HP = 745.7 W).

Q4: What if I have torque in different units?
A: Convert to Nm first. Common conversions: 1 lb-ft = 1.35582 Nm, 1 kg-cm = 0.0980665 Nm.

Q5: Why is the result in watts rather than kilowatts?
A: Watts are the SI unit for power. For kilowatts, divide the result by 1000. Many industrial applications use kW for larger power ratings.