1. What is Torque in Electric Motors?

Torque is the rotational force produced by an electric motor shaft. It's a crucial parameter in motor selection and mechanical system design, determining the motor's ability to perform work under load.

2. How Does the Torque Calculator Work?

The calculator uses the fundamental torque formula:

Where:

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

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

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for selecting appropriate motors, designing mechanical systems, ensuring proper gear ratios, and preventing mechanical failures from excessive torque.

4. Using the Calculator

Tips: Enter motor power in kW and rotational speed in RPM. Both values must be positive numbers (power > 0, RPM > 0). The calculator will compute the torque in Newton-meters (Nm).

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 combines conversion factors: (60 seconds/minute)/(2π radians/revolution) × 1000 (to convert kW to W), approximately equal to 9550.

Q2: What's the difference between starting torque and running torque?
A: Starting torque is higher as motors must overcome static friction, while running torque is typically lower once the system is in motion.

Q3: How does voltage affect torque?
A: In AC induction motors, torque is proportional to the square of the voltage. Voltage drops significantly reduce available torque.

Q4: What is the relationship between torque and horsepower?
A: Horsepower = (Torque × RPM)/5252 (when torque is in lb-ft). They're related through rotational speed.

Q5: How do I account for efficiency losses?
A: For more accurate results, multiply the calculated torque by the motor's efficiency percentage (as a decimal).