1. What is Torque Calculation from Power and RPM?

Definition: This calculator determines the torque produced by a rotating system based on its power output and rotational speed.

Purpose: It helps engineers and mechanics understand the twisting force available at different RPM levels for motors, engines, and other rotating machinery.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Torque (pound-feet)
• \( P_w \) — Power (watts)
• \( RPM \) — Rotational speed (revolutions per minute)
• \( 2\pi \) — Constant for converting radians to revolutions
• \( 60 \) — Constant for converting seconds to minutes

Explanation: The formula converts power (energy per second) into rotational force at a given speed, accounting for unit conversions.

3. Importance of Torque Calculation

Details: Understanding torque is crucial for designing mechanical systems, selecting motors, and ensuring proper power transmission in vehicles and machinery.

4. Using the Calculator

Tips: Enter the power in watts and rotational speed in RPM. Both values must be greater than zero for calculation.

5. Frequently Asked Questions (FAQ)

Q1: What units does this calculator use?
A: Power in watts, speed in RPM, and outputs torque in pound-feet (lb-ft).

Q2: Can I use horsepower instead of watts?
A: First convert horsepower to watts (1 HP = 745.7 watts) before using this calculator.

Q3: Why does torque decrease as RPM increases?
A: For a given power output, torque must decrease as speed increases because power is the product of torque and angular velocity.

Q4: How accurate is this calculation?
A: It provides theoretical torque under ideal conditions. Real-world values may differ due to efficiency losses.

Q5: What's a typical torque range for electric motors?
A: Small motors might produce 1-10 lb-ft, while industrial motors can produce hundreds or thousands of lb-ft.