1. What is the Torque Formula?

The torque formula calculates the rotational force produced by an electric motor based on its horsepower and rotational speed. It provides a fundamental relationship between power, speed, and torque in mechanical systems.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (lb-ft)
• \( HP \) — Horsepower
• \( RPM \) — Revolutions per minute
• \( 5252 \) — Conversion constant

Explanation: The constant 5252 comes from the relationship between horsepower, torque, and RPM, where 1 horsepower equals 550 foot-pounds per second and there are 60 seconds in a minute.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for motor selection, mechanical design, power transmission systems, and ensuring proper operation of electric motors in various applications.

4. Using the Calculator

Tips: Enter horsepower and RPM values. Both values must be positive numbers. The calculator will compute the torque in pound-feet (lb-ft).

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 comes from the conversion between horsepower and torque, where 1 HP = 550 ft-lb/sec and there are 60 seconds in a minute (550 × 60 ÷ 2π ≈ 5252).

Q2: What are typical torque values for electric motors?
A: Torque values vary widely depending on motor size and type, ranging from less than 1 lb-ft for small motors to thousands of lb-ft for large industrial motors.

Q3: How does RPM affect torque?
A: For a given horsepower, torque decreases as RPM increases. This is why high-torque applications often use gear reduction systems.

Q4: Can this formula be used for all types of motors?
A: This formula applies to all rotating machinery where horsepower and RPM are known, including AC/DC motors, engines, and other power transmission systems.

Q5: What is the difference between starting torque and running torque?
A: Starting torque is the torque required to start a motor from standstill, while running torque is the torque needed to maintain operation. Starting torque is typically higher.