1. What is Motor Torque?

Torque is a rotational force produced by an electric motor. It represents the motor's ability to do work and is typically measured in Newton-meters (Nm). The torque output determines how much load the motor can handle.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

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

Explanation: The formula shows that torque is inversely proportional to speed 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, and preventing motor overload or premature failure.

4. Using the Calculator

Tips: Enter the motor's rated power in kW and its rated 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 a conversion factor derived from unit conversions (60 seconds/minute × 1000 watts/kilowatt) divided by 2π radians/revolution.

Q2: How does torque relate to horsepower?
A: Horsepower can be converted to kW (1 HP ≈ 0.746 kW) and then used in the torque formula. Torque and horsepower are related through RPM.

Q3: What is typical torque for electric motors?
A: Torque varies greatly by motor size and type. Small motors might produce fractions of Nm, while large industrial motors can produce thousands of Nm.

Q4: Does torque change with speed?
A: For a given power, torque decreases as speed increases. However, motor torque characteristics vary across different motor types (constant torque, variable torque, etc.).

Q5: How is torque measured in practice?
A: Torque can be measured directly with torque sensors or dynamometers, or calculated from electrical measurements and motor efficiency data.