1. What is the AC Motor Torque Formula?

The AC motor torque formula calculates the torque produced by an alternating current motor based on its power output and rotational speed. Torque is a crucial parameter in motor selection and mechanical design.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( P \) — Power (kW)
• \( N \) — Speed (RPM)
• 9550 — Conversion constant (derived from unit conversions)

Explanation: The formula shows that torque is inversely proportional to speed when power is constant. The constant 9550 comes from converting units (kW to W and rev/min to rad/s).

3. Importance of Torque Calculation

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

4. Using the Calculator

Tips: Enter power in kilowatts (kW) and speed in revolutions per minute (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 the constant 9550 used in the formula?
A: The constant comes from unit conversions: 60,000 (converting minutes to seconds and radians to revolutions) divided by 2π (radians in a revolution) ≈ 9550.

Q2: What is typical torque for AC motors?
A: Torque varies greatly by motor size and design. Small motors might produce <1 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 overcome load. Higher torque means better ability to start under load and handle sudden load increases.

Q4: Does this formula work for DC motors too?
A: Yes, the same formula applies to DC motors when using the motor's power output and speed.

Q5: How does voltage affect torque?
A: In AC motors, torque is proportional to the square of the voltage. Lower voltage can significantly reduce available torque.