1. What is Electric Motor Torque?

Torque is the rotational force produced by an electric motor. It's a crucial parameter in motor selection and mechanical system design, determining the motor's ability to perform work under load.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque in Newton-meters (Nm)
• \( P \) — Power in kilowatts (kW)
• \( N \) — Rotational speed in revolutions per minute (RPM)
• 9550 — Conversion factor combining unit conversions and constants

Explanation: The formula relates the motor's power output to its rotational speed, showing that torque decreases as speed increases for a given power.

3. Importance of Torque Calculation

Details: Understanding motor torque is essential for proper motor selection, ensuring the motor can handle the required mechanical load without stalling or overheating.

4. Using the Calculator

Tips: Enter the motor's rated power in kW and its operating speed in RPM. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 combines the conversion factors between kW to W, RPM to rad/s, and includes the 2π factor from rotational mechanics (60,000/2π ≈ 9550).

Q2: What's the difference between starting torque and running torque?
A: Starting torque is the torque when the motor begins rotating (often higher), while running torque is during continuous operation.

Q3: How does voltage affect motor torque?
A: For AC induction motors, torque is proportional to the square of the voltage. Reduced voltage significantly decreases available torque.

Q4: What is the torque-speed relationship in motors?
A: Most motors have an inverse relationship - torque decreases as speed increases, following their characteristic curves.

Q5: How do I select a motor based on torque requirements?
A: Choose a motor whose torque-speed curve exceeds your application's requirements at all operating points, with appropriate safety margins.