1. What is Electric Motor Torque Calculation?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Torque (pound-feet)
• \( HP \) — Horsepower
• \( RPM \) — Rotational speed (revolutions per minute)
• 5252 — Conversion constant (derived from unit conversions)

Explanation: The formula shows the inverse relationship between torque and speed - as RPM increases, torque decreases for a given horsepower.

3. Importance of Torque Calculation

Details: Proper torque calculation ensures motors are properly sized for their applications, preventing overload conditions or inefficient operation.

4. Using the Calculator

Tips: Enter the motor's horsepower and operating RPM. Both values must be greater than zero. The result shows the torque in pound-feet.

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 and linear work.

Q2: Can I use this for metric units?
A: No, this formula is for imperial units. For metric (Nm), use: \( T = \frac{P \times 9550}{RPM} \) where P is in kW.

Q3: Does this work for all motor types?
A: Yes, the formula applies to all electric motors (AC, DC, induction, etc.) as it relates power to rotational motion.

Q4: What's typical torque for a 1 HP motor at 1750 RPM?
A: About 3 lb-ft (1 × 5252 ÷ 1750 = 3.001).

Q5: How does torque relate to motor starting?
A: Motors typically produce higher starting torque (2-3× rated torque) to overcome initial inertia.