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Torque Formula:
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The electric motor torque formula calculates torque from horsepower and rotational speed using the relationship T = (HP × 5252) / RPM. This formula is fundamental in mechanical engineering for determining the rotational force produced by electric motors.
The calculator uses the torque formula:
Where:
Explanation: The constant 5252 comes from the relationship between rotational power and torque, where 1 horsepower is defined as 550 foot-pounds per second, and there are 60 seconds in a minute and 2π radians in a revolution.
Details: Accurate torque calculation is essential for motor selection, mechanical system design, performance analysis, and ensuring proper operation of rotating machinery and power transmission systems.
Tips: Enter horsepower and RPM values. Both values must be positive numbers greater than zero for accurate calculation.
Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 comes from the conversion between different units of power and rotational speed (550 ft-lb/sec × 60 sec/min ÷ 2π rad/rev).
Q2: What are typical torque values for electric motors?
A: Torque values vary widely depending on motor size and type, ranging from fractional lb-ft for small motors to thousands of lb-ft for large industrial motors.
Q3: How does torque relate to motor performance?
A: Torque determines a motor's ability to overcome resistance and perform work. Higher torque means better ability to handle heavy loads and accelerate quickly.
Q4: Can this formula be used for all types of motors?
A: This formula applies to any rotating machinery where horsepower and RPM are known, though specific motor characteristics may affect actual performance.
Q5: How does torque change with RPM in electric motors?
A: Different motor types have different torque-speed characteristics. Some provide constant torque across speeds, while others have torque that varies with RPM.