1. What is the Motor Torque Formula?

The motor torque formula calculates the rotational force produced by an electric motor based on its power output and rotational speed. It's essential for motor selection and mechanical system design.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

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

Explanation: The formula shows that torque is inversely proportional to speed when power is constant. Higher speed means lower torque for the same power output.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial 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: 9550 combines the conversion factors from kW to W (1000), minutes to seconds (60), and radians to revolutions (2π) into one constant (60000/2π ≈ 9550).

Q2: What are typical torque values for electric motors?
A: Torque varies widely by motor size and application, 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 a motor's ability to overcome load resistance. Higher torque means better capability to start under load or handle heavy loads.

Q4: What if I have power in HP instead of kW?
A: First convert HP to kW (1 HP ≈ 0.746 kW) or use the HP version of the formula: T = (P × 5252)/N.

Q5: Does this formula work for all motor types?
A: Yes, it applies to all rotating machinery, though actual torque may vary with efficiency and operating conditions.