1. What is Motor Torque?

Torque is the rotational force produced by an AC motor. It's a crucial parameter that determines the motor's ability to perform work and overcome load resistance.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Newton-meters, Nm)
• \( P \) — Power (kilowatts, kW)
• \( N \) — Rotational speed (revolutions per minute, RPM)
• 9550 — Conversion factor (derived from unit conversions)

Explanation: The formula shows that torque is inversely proportional to speed when power is constant. Higher speed means lower torque and vice versa.

3. Importance of Torque Calculation

Details: Knowing a motor's torque is essential for proper motor selection, ensuring it can handle the required load without stalling or overheating.

4. Using the Calculator

Tips: Enter power in kW and speed in RPM. Both values must be positive numbers. The calculator will compute the torque in Newton-meters (Nm).

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 is a conversion factor derived from unit conversions (60 seconds/minute × 1000 watts/kilowatt) divided by 2π radians/revolution.

Q2: What is typical torque for AC motors?
A: Torque varies greatly by motor size and design. Small motors might produce 1-10 Nm, while large industrial motors can produce thousands of Nm.

Q3: How does voltage affect torque?
A: In AC induction motors, torque is proportional to the square of the voltage. A 10% voltage drop results in about 19% torque reduction.

Q4: What's the difference between starting and running torque?
A: Starting torque is the torque when the motor begins turning from rest, while running torque is during normal operation. Starting torque is typically higher.

Q5: Can I use this for DC motors?
A: The same formula applies to DC motors, but their torque characteristics differ from AC motors due to different construction and operating principles.