1. What is Motor Torque?

Definition: Motor torque is the rotational force produced by an engine or motor, measured in pound-feet (lb-ft).

Purpose: This calculator helps determine the torque output of a motor based on its horsepower and RPM.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Torque (lb-ft)
• \( HP \) — Horsepower
• \( RPM \) — Revolutions per minute
• 5252 — Conversion constant (derived from the relationship between HP, torque, and RPM)

Explanation: The formula shows that torque is inversely proportional to RPM when horsepower is constant.

3. Importance of Torque Calculation

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

4. Using the Calculator

Tips: Enter the motor's horsepower and RPM values. Both must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 used in the formula?
A: 5252 is the RPM at which horsepower and torque (in lb-ft) are equal, derived from the conversion between units of power and rotational force.

Q2: What's the difference between torque and horsepower?
A: Torque is a measure of rotational force, while horsepower is a measure of power (work done over time).

Q3: How does torque change with RPM?
A: For a given horsepower, torque decreases as RPM increases, and vice versa.

Q4: What's a typical torque value for electric motors?
A: This varies widely, but for example, a 10 HP motor at 1750 RPM produces about 30 lb-ft of torque.

Q5: Can I use this for internal combustion engines?
A: Yes, the formula applies to any rotating machinery where HP and RPM are known.