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Electric Motor Torque Formula:
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The electric motor torque calculation determines the rotational force produced by an electric motor based on its power output and rotational speed. This is essential for understanding motor performance and selecting appropriate motors for specific applications.
The calculator uses the torque formula:
Where:
Explanation: The constant 9550 is derived from unit conversions to provide torque in Newton-meters when power is in kilowatts and speed is in revolutions per minute.
Details: Accurate torque calculation is crucial for motor selection, mechanical design, and ensuring proper operation of motor-driven systems. It helps determine if a motor can provide sufficient rotational force for a given application.
Tips: Enter power in kilowatts (kW) and rotational speed in revolutions per minute (rpm). Both values must be positive numbers greater than zero.
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 conversion between radians and revolutions (2π rad/rev × 60 sec/min ≈ 9550).
Q2: What is a typical torque range for electric motors?
A: Torque values vary widely depending on motor size and type, ranging from fractional Nm for small motors to thousands of Nm for large industrial motors.
Q3: How does torque relate to motor performance?
A: Torque determines the motor's ability to overcome load resistance and accelerate rotating masses. Higher torque enables handling heavier loads and faster acceleration.
Q4: Can this formula be used for all types of electric motors?
A: This formula provides theoretical maximum torque and applies to various AC and DC motor types, though actual torque may vary due to efficiency factors and motor characteristics.
Q5: How does torque change with motor speed?
A: For constant power applications, torque decreases as speed increases, following the inverse relationship shown in the formula T = P/ω (where ω is angular velocity).