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Motor Torque Equation:
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The motor torque equation calculates the torque produced by an engine or motor based on its horsepower and rotational speed (RPM). It provides a fundamental relationship between power, speed, and torque in mechanical systems.
The calculator uses the motor torque equation:
Where:
Explanation: The constant 5252 comes from the relationship between rotational power and torque, where 1 horsepower equals 550 foot-pounds per second and there are 60 seconds in a minute.
Details: Torque calculation is essential for engine performance analysis, mechanical design, vehicle dynamics, and industrial applications where rotational force needs to be determined for proper system sizing and performance evaluation.
Tips: Enter horsepower (must be greater than 0) and RPM (must be greater than 0). The calculator will compute the torque in pound-feet (lb-ft).
Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 comes from unit conversions where 1 HP = 550 ft-lb/sec and there are 60 seconds in a minute (550 × 60 ÷ 2π ≈ 5252).
Q2: What are typical torque values for different engines?
A: Torque values vary widely by engine type - small car engines might produce 100-200 lb-ft, while large diesel engines can produce over 1000 lb-ft.
Q3: How does torque relate to vehicle performance?
A: Torque determines acceleration and pulling power, while horsepower relates to top speed. Higher torque at lower RPM provides better low-end acceleration.
Q4: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotational power system, though electric motors often have different torque characteristics than combustion engines.
Q5: What's the difference between lb-ft and Nm torque units?
A: lb-ft (pound-feet) is the imperial unit while Nm (Newton-meters) is the metric unit. 1 lb-ft ≈ 1.35582 Nm.