1. What is AC Motor Torque?

Torque is the rotational force produced by an AC motor. It represents the motor's ability to perform work and is a critical parameter in motor selection and application design.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( \tau \) — Torque (N·m)
• \( P \) — Power (kW)
• \( n \) — Rotational speed (rpm)

Explanation: The constant 9550 is derived from unit conversion factors to calculate torque in Newton-meters from power in kilowatts and rotational speed in revolutions per minute.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for proper motor selection, ensuring the motor can provide sufficient rotational force for the intended application without overloading.

4. Using the Calculator

Tips: Enter power in kilowatts (kW) and rotational speed in revolutions per minute (rpm). Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between starting torque and running torque?
A: Starting torque is the torque produced at zero speed when the motor is energized, while running torque is the torque produced when the motor is operating at its rated speed.

Q2: How does voltage affect AC motor torque?
A: Torque in AC motors is proportional to the square of the voltage. A 10% voltage drop results in approximately a 19% reduction in torque.

Q3: What is the relationship between torque and horsepower?
A: Horsepower is a function of torque and speed: HP = (Torque × RPM) / 5252. The two are directly related but represent different aspects of motor performance.

Q4: Why is 9550 used in the torque formula?
A: The constant 9550 comes from unit conversion: 60,000/(2π) ≈ 9550, which converts power in kW and speed in rpm to torque in N·m.

Q5: How does motor efficiency affect torque calculation?
A: The formula calculates theoretical output torque. Actual torque may be slightly lower due to efficiency losses in the motor.