1. What is a Motor HP to Torque Calculator?

Definition: This calculator converts motor horsepower and RPM to torque output in pound-feet (lb-ft).

Purpose: It helps engineers, mechanics, and motor enthusiasts understand the torque characteristics of motors at different RPMs.

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 remains constant.

3. Importance of Torque Calculation

Details: Torque determines a motor's rotational force and is critical for understanding performance characteristics, especially in automotive and industrial applications.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 the magic number in the formula?
A: 5252 comes from the conversion between rotational speed and power (1 HP = 550 ft-lb/sec, and there are 60 seconds in a minute).

Q2: At what RPM does HP equal torque?
A: At 5252 RPM, the HP and torque values will be numerically equal (though they have different units).

Q3: Does this work for electric motors and engines?
A: Yes, the formula applies to all rotating machinery where HP and RPM are known.

Q4: How does torque change with RPM?
A: For a constant HP motor, torque decreases as RPM increases, and vice versa.

Q5: What's a typical torque range for car engines?
A: Passenger car engines typically produce 100-400 lb-ft of torque, with RPM ranges between 1,500-6,000.