How to Calculate an Electrical Torque

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Torque is the force required to turn or rotate things. Formally, torque is the measure of how much force must be applied to cause an object to rotate about its axis. Electrical torque is torque created by electrical stimulation or power. The best example of electrical torque is the electric motor where electric power causes the motor shaft to turn or rotate about its axis at a speed proportional to the applied power. For this reason, a good way to calculate and determine electrical torque is to calculate the electric torque associated with an electric motor.

Things You'll Need

  • Calculator
  • Electric motor design requirements
  • Find the horsepower, or "hp," associated with the electrical motor from design specifications.

  • Find the revolutions per minutes, or "n", associated the electrical motor from design specifications. This is the speed or "rpm" you are looking to create with the electrical torque.

  • Calculate the torque, or "T," of the electric motor using the formula: T = hp (63025)/n. For example, if hp is 150hp, n is 750 revolutions per minute, T will be 12,605 lbf, which reads 12,605 pound-force: (150)(63025)/750.

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