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AC Motor Torque Formula:
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AC motor torque is the rotational force produced by an AC motor. It's a crucial parameter that determines the motor's ability to perform work and overcome resistance. Torque is typically measured in Newton-meters (Nm) and varies with motor speed and power.
The calculator uses the torque formula:
Where:
Explanation: The formula calculates the torque output of an AC motor based on its power rating and rotational speed. The constant 9550 comes from the conversion of units (60/2π × 1000) to get torque in Nm from power in kW and speed in rpm.
Details: Accurate torque calculation is essential for proper motor selection, ensuring the motor can handle the required load, preventing overload conditions, and optimizing energy efficiency in various applications.
Tips: Enter power in kilowatts (kW) and speed in revolutions per minute (rpm). Both values must be positive numbers. The calculator will compute the torque in Newton-meters (Nm).
Q1: Why is the constant 9550 used in the formula?
A: The constant 9550 comes from unit conversions: (60/2π) × 1000 ≈ 9550, which converts power from kW to W, and speed from rpm to rad/s.
Q2: What is the difference between starting torque and running torque?
A: Starting torque is the torque produced when the motor begins to rotate, while running torque is the torque produced during normal operation at rated speed.
Q3: How does motor speed affect torque?
A: In AC motors, torque typically decreases as speed increases, following an inverse relationship as shown in the formula.
Q4: Can this formula be used for all types of AC motors?
A: This formula provides a general calculation for AC motor torque, but specific motor types (induction, synchronous) may have additional factors affecting torque characteristics.
Q5: What are typical torque values for industrial AC motors?
A: Torque values vary significantly based on motor size and application, ranging from less than 1 Nm for small motors to thousands of Nm for large industrial motors.