1. What is Three-Phase Motor Torque?

Three-phase motor torque is the rotational force produced by a three-phase electric motor. It represents the motor's ability to perform work and is a critical parameter in motor selection and application.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( P \) — Power (kW)
• \( N \) — Speed (rpm)

Explanation: The constant 9550 is derived from unit conversion factors to calculate torque in Newton-meters from power in kilowatts and speed in revolutions per minute.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for proper motor selection, ensuring the motor can provide sufficient rotational force for the intended application without overloading.

4. Using the Calculator

Tips: Enter power in kilowatts (kW) and speed in revolutions per minute (rpm). Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 9550 used in the formula?
A: The constant 9550 comes from the conversion factors between different units of measurement (kW to W, minutes to seconds, and radians conversion).

Q2: What is the typical torque range for three-phase motors?
A: Torque values vary significantly based on motor size and design, ranging from a few Nm for small motors to thousands of Nm for large industrial motors.

Q3: How does motor torque affect application performance?
A: Sufficient torque is necessary to overcome starting inertia and maintain operation under load. Insufficient torque can cause motor stalling or failure to start.

Q4: Are there different types of torque in motors?
A: Yes, motors have starting torque, pull-up torque, breakdown torque, and full-load torque, each important for different aspects of motor performance.

Q5: Can this formula be used for single-phase motors?
A: While the basic principle is similar, single-phase motors have different performance characteristics and may require additional considerations.