1. What is Torque 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 relationship between power, speed, and torque in mechanical systems.

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 unit conversion
• \( 60 \) — Seconds to minutes conversion

Explanation: The formula converts power in watts to torque in pound-feet by accounting for the rotational speed and necessary unit conversions.

3. Importance of Torque Calculation

Details: Understanding torque is crucial for designing mechanical systems, selecting motors, and ensuring proper operation of rotating equipment.

4. Using the Calculator

Tips: Enter the power in watts and rotational speed in RPM. Both values must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 60 in the numerator?
A: The 60 converts seconds to minutes since power is energy per second (watts) and RPM is revolutions per minute.

Q2: What's the relationship between power, torque, and RPM?
A: Power is the product of torque and angular velocity. At constant power, torque decreases as RPM increases.

Q3: Can I use horsepower instead of watts?
A: Yes, but you'll need to convert horsepower to watts first (1 hp = 745.7 watts).

Q4: Why is torque important in engines?
A: Torque determines the rotational force available to do work, affecting acceleration and load-carrying capacity.

Q5: How does this relate to electric motors?
A: Motor performance curves often show torque vs. RPM at different power levels - this calculation helps interpret those curves.