1. What is Motor Torque?

Motor torque is the rotational force produced by an electric motor. It's a crucial parameter in mechanical systems that determines the motor's ability to perform work and overcome resistance.

2. How Does the Calculator Work?

The calculator uses the motor torque formula:

Where:

• \( T \) — Torque in Newton-meters (Nm)
• \( P \) — Power in kilowatts (kW)
• \( N \) — Rotational speed in revolutions per minute (RPM)
• 9550 — Conversion factor combining unit conversions and constants

Explanation: The formula shows that torque is inversely proportional to speed when power is constant. The 9550 factor comes from unit conversions (kW to W, minutes to seconds) and the relationship between power, torque, and angular velocity.

3. Importance of Torque Calculation

Details: Knowing motor torque is essential for selecting the right motor for an application, designing mechanical systems, and ensuring proper operation under load conditions.

4. Using the Calculator

Tips: Enter power in kilowatts (kW) and rotational speed in RPM. Both values must be positive numbers. For horsepower, first convert to kW (1 HP ≈ 0.7457 kW).

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: 9550 combines the conversion factors for units (1000 for kW to W, 60 for minutes to seconds) and the relationship between power and angular velocity (2π radians per revolution).

Q2: What's the difference between torque and power?
A: Power is the rate of doing work, while torque is the rotational force. Power = Torque × Angular Velocity.

Q3: How does torque relate to motor size?
A: Generally, higher torque requires a larger motor, but gearing can be used to increase torque at the expense of speed.

Q4: What affects motor torque output?
A: Torque depends on motor design, electrical input, and load conditions. It typically varies with speed in different ways for different motor types.

Q5: How do I measure torque directly?
A: Torque can be measured using torque sensors, dynamometers, or by calculating it from known mechanical parameters and measured forces.