1. What is Electric Motor Torque?

Electric motor torque is the rotational force produced by an electric motor. It is a crucial parameter that determines the motor's ability to perform work and overcome resistance. Torque is measured in Newton-meters (Nm) and varies with motor speed and power.

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 conversions between kilowatts, Newton-meters, and revolutions per minute. This formula provides the relationship between power, speed, and torque in electric motors.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for selecting the right motor for specific applications, ensuring proper performance, preventing overload conditions, and optimizing energy efficiency in industrial and commercial systems.

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 for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 9550 used in the formula?
A: The constant 9550 comes from unit conversions: 1 kW = 1000 W, 1 Nm/s = 1 W, and there are 60 seconds in a minute. The exact derivation is 1000/(2π/60) ≈ 9549.3, which is rounded to 9550 for practical calculations.

Q2: What is the difference between starting torque and running torque?
A: Starting torque is the torque produced when the motor begins to rotate from standstill, while running torque is the torque produced during normal operation at a given speed.

Q3: How does torque vary with motor speed?
A: In most AC induction motors, torque decreases as speed increases. The specific torque-speed characteristic depends on the motor type and design.

Q4: Can this formula be used for all types of electric motors?
A: This formula provides a general calculation for torque based on power and speed, but specific motor types (DC, induction, synchronous) may have different torque characteristics that should be considered for precise applications.

Q5: How important is torque in motor selection?
A: Torque is critical in motor selection as it determines whether the motor can overcome the load's resistance and accelerate it to the desired speed. Insufficient torque will cause the motor to stall or operate inefficiently.