1. What is Torque?

Torque is a measure of the rotational force applied to an object. In mechanical engineering, it represents how much force is acting on an object to cause it to rotate. The SI unit for torque is the newton-meter (Nm).

2. Torque Formula Explained

The calculator uses the torque formula:

Where:

• \( Power \) — Mechanical power in kilowatts (kW)
• \( RPM \) — Rotational speed in revolutions per minute
• 9550 — Conversion factor combining unit conversions and constants

Explanation: The formula shows that torque is inversely proportional to RPM when power is constant. The constant 9550 comes from unit conversions (1 kW = 1000 W, 1 minute = 60 seconds) and the relationship between power and torque.

3. Practical Applications

Details: This calculation is essential for designing and selecting motors, gearboxes, and other rotating machinery. It helps engineers determine if a motor can provide enough rotational force for a given application.

4. Using the Calculator

Tips: Enter power in kilowatts (kW) and rotational speed in RPM. Both values must be positive numbers (RPM must be greater than 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 is derived from unit conversions: (60 seconds/minute × 1000 W/kW) / (2π radians/revolution) ≈ 9550.

Q2: What's the difference between torque and power?
A: Torque is a measure of rotational force, while power is the rate at which work is done (torque × angular velocity).

Q3: How does torque relate to vehicle performance?
A: Higher torque at low RPM provides better acceleration from standstill, while power determines top speed.

Q4: Can I use this for imperial units?
A: No, this formula is for metric units. For horsepower and lb-ft, use: Torque (lb-ft) = (HP × 5252)/RPM.

Q5: What affects torque output in motors?
A: Motor design, electrical characteristics, cooling, and load conditions all affect torque output.