1. What is Motor Torque?

Torque is the rotational force produced by a motor. For a 460V 3-phase motor, torque indicates how much load the motor can handle at a given speed. It's a crucial parameter for selecting motors for industrial applications.

2. How Does the Calculator Work?

The calculator uses the torque equation:

Where:

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

Explanation: The equation shows that torque is directly proportional to power and inversely proportional to speed. The constant 9550 comes from unit conversions (1 kW = 1000 W, 1 Nm/s = 1 W, and converting minutes to seconds).

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for:

• Selecting the right motor for an application
• Ensuring the motor can handle the required load
• Preventing motor overload and failure
• Designing mechanical systems with proper power transmission

4. Using the Calculator

Tips:

• Enter the motor's rated power in kW (found on the nameplate)
• Enter the motor's operating speed in RPM
• For variable speed applications, calculate torque at different operating points
• All values must be positive numbers

5. Frequently Asked Questions (FAQ)

Q1: Why 9550 in the formula?
A: It's a conversion factor derived from: (60 seconds/minute) × (1000 watts/kW) / (2π radians/revolution) ≈ 9549.3, typically rounded to 9550.

Q2: Does voltage affect torque calculation?
A: While voltage affects motor performance, this calculation is based on power and speed. The 460V specification indicates the motor's voltage rating but isn't directly used in this torque calculation.

Q3: What's typical torque for a 460V 3-phase motor?
A: Torque varies greatly by motor size. A 10 kW motor at 1450 RPM would produce about 65.9 Nm, while a 100 kW motor at the same speed would produce about 659 Nm.

Q4: How does torque relate to current?
A: Torque is directly proportional to current in a motor. Higher torque demands require higher current, which is why overload protection is critical.

Q5: Can this be used for motors at other voltages?
A: Yes, the torque formula applies to any AC or DC motor, though the power factor affects actual torque in AC motors.