1. What is the Electric Motor Torque Formula?

The electric motor torque formula calculates the torque produced by an electric motor based on its power and rotational speed. Torque is a crucial parameter in motor selection and mechanical system design.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( P \) — Power (kW)
• \( N \) — Speed (RPM)
• 9550 — Conversion factor combining unit conversions and constants

Explanation: The formula shows that torque is inversely proportional to speed when power is constant. The 9550 factor comes from unit conversions (kW to W, RPM to rad/s).

3. Importance of Torque Calculation

Details: Torque calculation is essential for selecting appropriate motors for applications, ensuring proper mechanical power transmission, and preventing system failures.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 9550?
A: It combines the conversion from kW to W (×1000) and RPM to rad/s (÷60×2π), resulting in 1000/(2π/60) ≈ 9549.3, typically rounded to 9550.

Q2: What is a typical torque range for electric motors?
A: Torque varies widely by motor size and type, 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 overcome load resistance. Higher torque means better ability to start under load or accelerate quickly.

Q4: What's the difference between starting torque and running torque?
A: Starting torque is the torque when the motor begins turning (often higher), while running torque is during continuous operation.

Q5: Can this formula be used for all motor types?
A: This formula works for any rotating machinery when you know power and speed, but actual motor torque characteristics may vary by motor type (AC, DC, etc.).