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 load resistance. The torque varies with speed and power input.

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 minutes to seconds).

3. Importance of Torque Calculation

Details: Calculating torque is essential for motor selection, ensuring the motor can handle the required load, and for designing mechanical systems that rely on motor power.

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 9550 used in the formula?
A: The constant 9550 comes from unit conversion: (60 seconds/minute × 1000 watts/kW) / (2π radians/revolution) ≈ 9549.3, typically rounded to 9550.

Q2: What is typical torque for AC motors?
A: Torque varies greatly by motor size. 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 ability to handle heavy loads.

Q4: Does this formula work for all motor types?
A: This formula works for AC motors operating at constant speed. For DC motors or variable frequency drives, additional factors may need consideration.

Q5: How does torque change with speed?
A: For AC induction motors, torque typically decreases as speed increases beyond the motor's rated speed (constant power region).