1. What is Motor Torque?

Torque is a rotational force produced by an electric motor. It represents the motor's ability to perform work and is typically measured in Newton-meters (Nm). The torque output determines how much load the motor can handle at a given speed.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( P \) — Power (kW)
• \( N \) — Speed (RPM)
• 9550 — Conversion constant (derived from unit conversions)

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

3. Importance of Torque Calculation

Details: Calculating torque is essential for selecting the right motor for an application, ensuring it can provide enough force to drive the load without stalling or overheating.

4. Using the Calculator

Tips: Enter the motor's rated power in kilowatts and its operating speed in RPM. Both values must be positive numbers. The calculator will compute the torque output in Newton-meters.

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 is a conversion factor derived from unit conversions (1 kW = 1000 W, 1 RPM = 2π/60 rad/s) to give torque in Nm directly.

Q2: What's the difference between starting torque and running torque?
A: Starting torque is the torque when the motor begins turning from rest, typically higher than running torque which is the torque during normal operation.

Q3: How does voltage affect torque?
A: For AC induction motors, torque is proportional to the square of the voltage. Reduced voltage can significantly decrease available torque.

Q4: What is the relationship between torque and horsepower?
A: Horsepower is a measure of power that combines torque and speed (HP = Torque × RPM / 5252 for imperial units).

Q5: How do I select a motor based on torque requirements?
A: Choose a motor whose torque-speed curve exceeds your application's requirements at all operating speeds, with some safety margin.