1. What is Motor Torque Calculation?

Definition: This calculator determines the torque produced by a motor based on its horsepower and rotational speed.

Purpose: It helps engineers and technicians select appropriate motors for mechanical systems and verify performance specifications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Torque Calculation

Details: Proper torque calculation ensures motors can handle mechanical loads without stalling and operate efficiently at desired speeds.

4. Using the Calculator

Tips: Enter the motor's horsepower and operating RPM. Both values must be > 0. The result shows torque in pound-feet (lb-ft).

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 used in the formula?
A: 5252 is the RPM at which horsepower and torque values intersect (1 HP = 1 lb-ft at 5252 RPM), derived from unit conversions.

Q2: What if my motor operates at very low RPM?
A: Low RPM motors produce high torque. Ensure your motor can handle the calculated torque without overheating.

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

Q4: How does torque relate to motor power?
A: Power (HP) is the rate of doing work, while torque is the rotational force. Power = Torque × RPM / 5252.

Q5: What about metric units?
A: For metric (Nm), use T = (HP × 7124) / RPM (where HP is metric horsepower) or convert results (1 lb-ft = 1.35582 Nm).