1. What is Torque in Electric Motors?

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 characteristics, especially in applications requiring variable speed or heavy loads.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( Power \) — Motor power in kilowatts (kW)
• \( RPM \) — Rotational speed in revolutions per minute
• 9550 — Conversion factor combining various unit conversions

Explanation: The formula shows that torque is inversely proportional to speed when power is constant. Higher RPM results in lower torque, and vice versa.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for motor selection, mechanical design, and ensuring proper operation of driven equipment. It helps prevent motor overload and ensures efficient energy use.

4. Using the Calculator

Tips: Enter motor power in kW and rotational speed in RPM. Both values must be positive numbers (power > 0, RPM ≥ 1).

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: The constant 9550 combines unit conversions (kW to W, minutes to seconds) and the relationship between rotational speed and angular velocity (2π radians per revolution).

Q2: What are typical torque values for electric motors?
A: Torque varies greatly by motor size and type. Small motors might produce fractions of Nm, while large industrial motors can produce thousands of Nm.

Q3: How does torque relate to motor performance?
A: Torque determines the motor's ability to overcome load resistance. High torque at low RPM is important for applications like elevators or crushers.

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

Q5: Can I use this for all motor types?
A: This formula works for most electric motors, but specific motor types (like steppers or servos) may have different torque characteristics.