Discussion
True or false: torque control of a dc motor is equivalent to current control.
Answer: A
Correct answer: True, provided the flux is held constant
Since \( T = k\Phi I_a \), holding the flux constant makes torque and armature current strictly proportional, so a current loop is a torque loop. This is exactly why dc drives are built with an inner current loop and why they gave such excellent torque control long before vector control brought the same capability to ac machines. The proviso matters: above base speed, where the field is being weakened, the proportionality no longer holds.
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