1. What is the Electric Motor Power Calculation?

The electric motor power calculation determines the mechanical power output of a motor based on its torque and rotational speed. It's essential for selecting the right motor for an application and understanding its performance characteristics.

2. How Does the Calculator Work?

The calculator uses the motor power formula:

Where:

• \( kW \) — Motor power in kilowatts
• \( \tau \) — Torque in Newton-meters (Nm)
• \( n \) — Rotational speed in revolutions per minute (rpm)
• 9549 — Conversion factor to get kW from Nm and rpm

Explanation: The formula converts the product of torque and speed into power units, accounting for the appropriate unit conversions.

3. Importance of Motor Power Calculation

Details: Accurate motor power calculation is crucial for proper motor selection, energy efficiency assessments, and mechanical system design.

4. Using the Calculator

Tips: Enter torque in Nm and rotational speed in rpm. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kW and horsepower?
A: 1 kW equals approximately 1.34 horsepower. The calculator provides results in kW, which is the SI unit for power.

Q2: Can I use this for all types of motors?
A: Yes, this calculation works for any rotating electric motor (AC, DC, induction, etc.) as long as you know the torque and speed.

Q3: What if I only know the power and need torque?
A: The formula can be rearranged: \( \tau = \frac{kW \times 9549}{n} \)

Q4: Why is the conversion factor 9549?
A: It comes from unit conversions: \( \frac{60000}{2\pi} \) to convert from W to kW and from rad/s to rpm.

Q5: Is this the input or output power?
A: This calculates mechanical output power. Input electrical power would be higher due to efficiency losses.