1. What is Electric Motor Torque?

Torque is the rotational equivalent of linear force in electric motors. It represents the motor's ability to perform work and is crucial for determining the motor's performance under load.

2. How Does the Calculator Work?

The calculator uses the torque equation:

Where:

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

Explanation: The equation relates the motor's power output to its rotational speed, with the constant 9550 converting between units (kW to W and RPM to rad/s).

3. Importance of Torque Calculation

Details: Torque calculation is essential for selecting appropriate motors for applications, determining load capacity, and ensuring proper operation under working conditions.

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 Newton-meters (N·m).

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 is derived from unit conversions: (60 sec/min × 1000 W/kW) / (2π rad/rev) ≈ 9550.

Q2: What is typical torque for electric motors?
A: Torque varies greatly by motor size and type. Small motors may produce <1 N·m while large industrial motors can produce thousands of N·m.

Q3: How does torque relate to motor power?
A: For a given power, torque is inversely proportional to speed. Higher speed motors produce less torque at the same power level.

Q4: What affects motor torque output?
A: Torque depends on motor design, current, magnetic flux, and for AC motors, the power factor.

Q5: How is torque measured experimentally?
A: Torque can be measured using dynamometers, torque sensors, or calculated from power and speed measurements.