VFDs operating in torque mode modulate power and speed

Torque control requires a variable-frequency drive (VFD), and it differs from speed control because the primary goal is to operate the motor at a commanded torque, regardless of the resulting speed. VFDs operating in torque mode modulate the power and speed to achieve a commanded torque.

Get your subscription to Control Design's print magazine, free to qualified individuals in North America.

This article from our Endeavor Business Media partner site, Processing, explains why torque control is necessary for many types of winding/unwinding applications and how general-purpose sensorless vector VFDs can perform this function.