1. What is a Power to Torque Calculator?

Definition: This calculator converts mechanical power (in watts) to torque (in pound-feet) given the rotational speed in RPM.

Purpose: It helps engineers and mechanics determine the torque output of motors and engines based on their power rating and rotational speed.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Torque (lb-ft)
• \( P_w \) — Power (watts)
• \( RPM \) — Rotational speed (revolutions per minute)
• \( 2\pi \) — Conversion factor for radians
• \( 60 \) — Conversion factor for seconds to minutes

Explanation: The formula converts power (energy per unit time) to torque (rotational force) by accounting for the rotational speed.

3. Importance of Power-Torque Conversion

Details: Understanding the relationship between power and torque is crucial for designing mechanical systems, selecting motors, and analyzing performance.

4. Using the Calculator

Tips: Enter the power in watts and rotational speed in RPM. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is torque important?
A: Torque determines the rotational force available to do work, crucial for applications requiring movement or lifting.

Q2: How do I convert horsepower to watts?
A: 1 horsepower = 745.7 watts. Multiply horsepower by 745.7 to get watts.

Q3: What's a typical RPM range for electric motors?
A: Common ranges are 1,000-3,600 RPM for AC motors and up to 10,000+ RPM for some DC motors.

Q4: Can I use this for engine torque calculations?
A: Yes, if you have the engine power in watts and know the RPM.

Q5: Why does torque decrease as RPM increases?
A: For a given power, torque must decrease as speed increases because power is the product of torque and angular velocity.