1. What is the Torque Formula?

The torque formula calculates motor torque from power and rotational speed. It provides a fundamental calculation for mechanical engineering applications involving motors and rotating machinery.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( P \) — Power (kW)
• \( N \) — Rotational speed (rpm)

Explanation: The formula converts power in kilowatts and speed in revolutions per minute to torque in Newton-meters, using the constant 9550 for unit conversion.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for motor selection, mechanical design, power transmission systems, and ensuring proper operation of rotating equipment.

4. Using the Calculator

Tips: Enter power in kilowatts (kW) and rotational speed in revolutions per minute (rpm). All values must be valid (power > 0, speed > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 9550 used in the formula?
A: The constant 9550 comes from the conversion factors between different units (kW to W, rpm to rad/s) in the fundamental power-torque relationship.

Q2: What are typical torque values for electric motors?
A: Torque values vary significantly based on motor size and type, ranging from fractional Nm for small motors to thousands of Nm for large industrial motors.

Q3: Can this formula be used for all types of motors?
A: Yes, this formula applies to all rotating machinery where power and speed are known, including AC/DC motors, engines, and turbines.

Q4: How does torque relate to motor performance?
A: Torque determines a motor's ability to overcome resistance and perform work. Higher torque enables handling heavier loads or faster acceleration.

Q5: What if I have power in horsepower instead of kilowatts?
A: Convert horsepower to kilowatts first (1 hp = 0.7457 kW) before using this calculator for accurate results.