1. What is the Torque Formula for Motors?

Definition: This calculator computes the torque produced by an electric motor based on its horsepower and rotational speed (RPM).

Purpose: It helps engineers, mechanics, and technicians determine the twisting force a motor can deliver at a given speed.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: Torque is inversely proportional to RPM when horsepower is constant. The constant 5252 comes from the RPM where horsepower and torque values cross on their curves.

3. Importance of Torque Calculation

Details: Understanding motor torque is crucial for proper motor selection, mechanical design, and ensuring the motor can handle the required load.

4. Using the Calculator

Tips: Enter the motor's horsepower and its rotational speed in RPM. Both values must be positive numbers (RPM must be > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 used in the formula?
A: 5252 is the RPM where torque (lb-ft) and horsepower values are equal. It comes from the conversion between foot-pounds per minute and horsepower (33,000 ft-lb/min = 1 HP).

Q2: What units does this formula use?
A: This formula uses horsepower (HP) for power, RPM for speed, and pound-feet (lb-ft) for torque.

Q3: Does this work for all motor types?
A: Yes, it works for any motor as long as you know its horsepower and RPM. However, peak torque may occur at different RPMs depending on motor design.

Q4: How does torque relate to motor performance?
A: Torque determines a motor's ability to do work (turn a load). Higher torque at a given RPM means more work capacity.

Q5: What if I know kW instead of HP?
A: First convert kW to HP (1 kW ≈ 1.341 HP), then use the calculator. Or use the metric formula: T = (kW × 9550) / RPM (result in Nm).