Rotor speed of separately ecxited DC motor with terminal voltage and field current
Electrical Engineering Asked by Lashsl on December 6, 2021
How does rotor speed vary with terminal voltage and field current of a separately excited DC motor? Is it different for a no load condition vs other loading condition?
One Answer
The operating speed and torque of a motor is always the intersection of the load's torque vs. speed demand curve and the motor's torque vs speed capability curve. Adjusting the armature voltage and field current creates alternative torque vs. speed capability curves as shown below. For a given load curve, increasing the armature voltage increases the operating speed proportionally and reducing the field current increases the speed.
Answered by Charles Cowie on December 6, 2021
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