Parameters in Per Unit Notation
At first, typical per unit values are obtained from the datasheet of a dc
motor. Then it is shown how the current loop can be designed. Next, the design
is verified by simulation. Finally, the speed loop design is illustrated.
In the per-unit calculations, a per unit value of 1 is assigned to the rated
armature voltage, the rated motor speed and the rated armature current. From
the values of the rated armature voltage and the rated motor speed, obtain
Km, the coefficient for the motor. Then other per unit values can
be obtained as outlined earlier. The applet displayed below computes the per
unit values given the actual values. The textfields contain default values
and the applet computes and displays the per unit values when the Compute
Button is clicked.
click here to open the applet
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