How Torque Optimization Affects Pump Motors

Have you wondered how variable frequency drives (VFDs or drives) and motors interact to provide the correct amount of power to achieve the desired outcome? This is a brief explanation of the interaction between torque, horsepower, and voltage. Eaton’s Enclosed Drives Product Manager, Sally Cogan, provides examples of how drives leverage technology to optimize torque.

Q: What is torque?

A: Torque is the amount of force needed to rotate an object on an axis. Around an axis you start getting into gravitational fields. The unit of measurement is pound feet (lb-ft) or Nm, and it is calculated using the formula t =F.rsin(θ), where torque equals force multiplied by length of the arm and angle between the force vector. An example of this is opening a door. Torque (t) is the force (F) exerted on the door times the width of the door (r) multiplied by the angle the door is opened (sin(θ)).

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Shopia Ketheeswararajah is a feature editor contributing to Pump Engineer, Stainless steel World Americas, Hose and Coupling World, and other related print & online media.