1. What is the Torque Equation?

The torque equation \( T = \frac{P \times 9550}{N} \) calculates the torque produced by an electric motor based on its power and rotational speed. This is fundamental for motor selection and mechanical system design.

2. How Does the Calculator Work?

The calculator uses the torque equation:

Where:

• \( T \) — Torque in Newton-meters (Nm)
• \( P \) — Power in kilowatts (kW)
• \( N \) — Rotational speed in revolutions per minute (RPM)
• 9550 — Conversion factor (derived from unit conversions)

Explanation: The equation shows that torque is inversely proportional to speed when power is constant. The 9550 factor comes from converting kW to W and RPM to rad/s.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for selecting appropriate motors, designing mechanical systems, and ensuring proper operation of machinery without overloading.

4. Using the Calculator

Tips: Enter power in kW and speed in RPM. Both values must be positive numbers. The calculator will compute the torque in Nm.

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: It's a conversion factor derived from unit conversions (1 kW = 1000 W, 1 RPM = π/30 rad/s).

Q2: What are typical torque values for electric motors?
A: Torque varies greatly by motor size - from fractional Nm for small motors to thousands of Nm for large industrial motors.

Q3: How does torque relate to motor performance?
A: Torque determines the motor's ability to perform work (rotate under load). Higher torque means better ability to overcome resistance.

Q4: What if I have power in horsepower instead of kW?
A: First convert horsepower to kW (1 HP ≈ 0.746 kW) before using this calculator.

Q5: Does this equation work for all motor types?
A: Yes, it's a general equation that applies to all rotary electric motors when operated at constant speed.