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 mechanical resistance. The torque varies with speed and depends on the electrical characteristics of the motor.

2. How Does the Calculator Work?

The calculator uses the AC motor torque equation:

Where:

• \( T \) — Torque in Newton-meters (Nm)
• \( V \) — Voltage in volts
• \( I \) — Current in amps
• \( PF \) — Power factor (unitless, 0-1)
• \( \eta \) — Efficiency (decimal, 0-1)
• \( N \) — Speed in RPM
• 9550 — Conversion constant

Explanation: The equation calculates torque based on the electrical power input (accounting for power factor and efficiency) divided by the rotational speed.

3. Importance of Torque Calculation

Details: Knowing the torque is essential for selecting the right motor for an application, ensuring it can handle the required mechanical load without stalling or overheating.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, power factor (typically 0.8-0.95), efficiency (typically 0.85-0.95), and speed in RPM. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is being converted into useful work.

Q2: Why does torque decrease as speed increases?
A: For a given power input, torque must decrease as speed increases because power is the product of torque and speed (P = T × ω).

Q3: What's typical efficiency for AC motors?
A: Efficiency ranges from about 85% for small motors to over 95% for large, high-efficiency motors.

Q4: Can I use this for DC motors?
A: No, DC motors have a different torque equation (T = k × I) where k is the motor constant.

Q5: How accurate is this calculation?
A: It provides a good estimate for steady-state operation but actual torque may vary due to factors like temperature and load conditions.