Torque of Motor Calculator

Torque Formula:

\[ Torque (Nm) = \frac{Power (kW) \times 9550}{RPM} \]

Torque:

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1. What is Motor Torque?

Torque is a rotational force produced by an electric motor. It's a crucial parameter that determines the motor's ability to perform work and overcome resistance. The torque of a motor depends on its power and rotational speed (RPM).

2. How Does the Calculator Work?

The calculator uses the torque formula:

\[ Torque (Nm) = \frac{Power (kW) \times 9550}{RPM} \]

Where:

\( Power \) — Motor power in kilowatts (kW)
\( RPM \) — Rotational speed in revolutions per minute
9550 — Conversion factor combining various unit conversions

Explanation: The formula shows that torque is inversely proportional to RPM when power is constant. Higher RPM motors typically produce less torque than lower RPM motors of the same power.

3. Importance of Torque Calculation

Details: Knowing a motor's torque is essential for proper motor selection, ensuring it can handle the required mechanical load. It's critical in applications like conveyor systems, pumps, and machine tools where starting and running torque requirements must be met.

4. Using the Calculator

Tips: Enter motor power in kW and rotational speed in RPM. Both values must be positive numbers (power > 0, RPM > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 is a conversion factor that combines the conversion from kW to watts (×1000), from minutes to seconds (÷60), and from radians to revolutions (÷2π).

Q2: What's the difference between starting torque and running torque?
A: Starting torque is the torque produced at zero speed, typically higher than running torque. Running torque is the torque produced at operating speed.

Q3: How does voltage affect torque?
A: In AC induction motors, torque is proportional to the square of the voltage. A 10% voltage drop results in about 19% torque reduction.

Q4: What is the relationship between torque and horsepower?
A: Horsepower = (Torque × RPM) / 5252 (for imperial units). Torque and horsepower are equal at 5252 RPM in imperial units.

Q5: How does gear reduction affect torque?
A: Gear reduction increases output torque while decreasing speed, with the torque multiplication factor equal to the gear ratio (assuming ideal efficiency).