Question

what is the advantage of decreasing the field current of a separately excited dc motor below its nominal value

Answer 1

Ability to rotate at higher speeds

Step-by-step explanation:

Constant K1 becomes greater than the other constant K2

This translates to that the motor being able to rotate at high speeds, without necessarily exceeding the nominal armature voltage.

The armature voltage is the voltage that is developed around the terminals of the armature winding of an Alternating Current, i.e AC or a Direct Current, i.e DC machine during the period in which it tries to generate power.