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). Understanding torque is essential for selecting the right motor for an application.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

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

Explanation: The formula shows that torque is inversely proportional to speed when power is constant. The 9550 factor comes from converting kW to Watts and RPM to rad/s.

3. Importance of Torque Calculation

Details: Accurate torque calculation helps in motor selection, ensuring the motor can handle the required load without stalling or overheating. It's crucial for applications requiring precise motion control.

4. Using the Calculator

Tips: Enter power in kilowatts (kW) and speed in revolutions per minute (RPM). Both values must be positive numbers. 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 is a conversion factor derived from (60 × 1000)/(2π) to convert between kW, RPM and Nm.

Q2: What's the difference between starting torque and running torque?
A: Starting torque is the torque when the motor begins turning from rest, while running torque 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. Lower voltage results in significantly reduced 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 select a motor based on torque requirements?
A: Choose a motor whose torque-speed curve exceeds your application's requirements at all operating speeds.