1. What is DC Motor Torque Calculation?

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

Purpose: It helps engineers and technicians understand motor performance characteristics for proper motor selection and application.

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

3. Importance of Torque Calculation

Details: Understanding motor torque is crucial for selecting motors that can provide sufficient rotational force for specific applications without stalling or overheating.

4. Using the Calculator

Tips: Enter the motor's horsepower rating and operating RPM. Both values 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 values are equal (when using lb-ft units), derived from the conversion between rotational power and linear power.

Q2: Does this work for AC motors too?
A: Yes, the formula applies to any rotating machinery, though AC motors have additional factors like power factor that affect performance.

Q3: What if I know torque but need horsepower?
A: Rearrange the formula: \( HP = \frac{T \times RPM}{5252} \)

Q4: How does torque relate to motor performance?
A: Torque determines the motor's ability to do work (lift, move, or rotate loads), while horsepower relates to how fast the work can be done.

Q5: What's typical torque for small DC motors?
A: Small hobby motors might produce 0.1-1 lb-ft, while industrial motors can produce hundreds or thousands of lb-ft.