1. What Is The Torque Formula?

The torque formula for electric motors calculates the rotational force produced by the motor based on its power output and rotational speed. Torque is a crucial parameter in motor selection and application design.

2. How Does The Calculator Work?

The calculator uses the torque formula:

Where:

• \( P \) — Power in kilowatts (kW)
• \( RPM \) — Rotational speed in revolutions per minute
• 9550 — Conversion constant (derived from 60,000/2π)

Explanation: The formula converts power and rotational speed into torque, which represents the rotational force produced by the electric motor.

3. Importance Of Torque Calculation

Details: Accurate torque calculation is essential for proper motor selection, ensuring the motor can provide sufficient force for the intended application without being oversized.

4. Using The Calculator

Tips: Enter power in kilowatts (kW) and rotational speed in RPM. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 9550 used in the formula?
A: The constant 9550 is derived from unit conversion factors (60,000/2π) to convert power in kW and speed in RPM to torque in Newton-meters.

Q2: Can I use horsepower instead of kilowatts?
A: Yes, but you would need to use a different constant. The formula would be: Torque (Nm) = (HP × 5252) / RPM.

Q3: What is a typical torque range for electric motors?
A: Torque varies significantly based on motor size and type. Small motors might produce less than 1 Nm, while large industrial motors can produce thousands of Nm.

Q4: Does torque change with motor speed?
A: For AC induction motors, torque typically decreases as speed increases beyond a certain point. DC motors often provide constant torque across their speed range.

Q5: How does torque relate to motor efficiency?
A: Motors are typically most efficient when operating near their rated torque. Operating significantly above or below the rated torque can reduce efficiency.