1. What is AC 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 resistance. The torque output varies with speed and power input.

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 shows that torque is inversely proportional to speed when power is constant. The 9550 factor comes from unit conversions (kW to W, minutes to seconds) and the relationship between power, torque, and angular velocity.

3. Importance of Torque Calculation

Details: Calculating torque is essential for selecting the right motor for an application, ensuring proper starting capability, and determining if the motor can handle the mechanical load requirements.

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. The calculator will compute the torque output in Nm.

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 combines the conversion factors for kW to W (1000), minutes to seconds (60), and the relationship between power and angular velocity (2π), resulting in 30,000/π ≈ 9550.

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

Q3: How does torque relate to motor performance?
A: Torque determines the motor's ability to start under load and accelerate. Higher torque means better starting capability and ability to handle heavy loads.

Q4: Does torque change with speed?
A: In AC motors, torque typically decreases as speed increases beyond the motor's base speed (constant power region).

Q5: Can I use this for DC motors?
A: Yes, the same formula applies to DC motors when using their power and speed ratings.