1. What is Electric Motor Torque?

Torque is the rotational force produced by an electric motor. It represents the motor's ability to perform work and is a critical parameter in motor selection for various applications.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( P \) — Power (kW)
• \( N \) — Rotational speed (rpm)
• 9550 — Conversion constant (derived from unit conversions)

Explanation: The formula calculates the torque output of an electric motor based on its power rating and rotational speed.

3. Importance of Torque Calculation

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

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 9550 used in the formula?
A: The constant 9550 comes from unit conversions: 60,000/(2π) ≈ 9550, which converts power in kW and speed in rpm to torque in Nm.

Q2: What is a typical torque range for electric motors?
A: Torque varies significantly based on motor type and size, ranging from less than 1 Nm for small motors to thousands of Nm for large industrial motors.

Q3: How does torque relate to motor performance?
A: Torque determines a motor's ability to overcome load resistance. Higher torque allows a motor to accelerate faster and handle heavier loads.

Q4: Does torque change with motor speed?
A: For most AC induction motors, torque decreases as speed increases beyond a certain point, following a characteristic torque-speed curve.

Q5: Can this formula be used for all motor types?
A: This formula provides theoretical maximum torque and works best for AC induction motors. Specialized motors may have different torque characteristics.