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EE 4420: Homework #4
Name ……………………….
Due day: 10.25.2004
1.
A 100 hp, 600 V, 1800 rpm, separately excited DC motor is supplied by a switch
mode PWM converter. The motor parameters are: R
a
= 0.1 Ω, L
a
= 5 mH, K
E
= K
T
=
2.86 V/(rad/s), J = 1.5
ּ
10
3
kg
ּ
m
2
, B = 0.02 N
ּ
m/(rad/s). The converter parameters are:
V
d
= 600 V, V
tri
= 5 V., f
s
= 33 kHz.
1)
Design the current control loop with the unity feedback. Assume phase margin
Φ
PM,I
= 90
o
, and the crossover frequency f
cI
= 1 kHz. Find the PI controller
gain k
p,I
and k
i,I
ignoring back EMF E
a
loop.
2)
Design the speed control loop with the unity feedback. Assume phase margin
Φ
PM,Ω
= 60
o
, and the crossover frequency f
cΩ
= 100 Hz. Find the PI controller
gain k
p,Ω
and k
i,Ω
assuming the closedcurrent loop to be ideal.
3)
Build the block diagram of the motor with current and speed PI controllers
and simulate starting of DC motor assuming the rated reference speed and
zero load torque (initial conditions). After the motor reached the steady speed,
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This note was uploaded on 02/06/2012 for the course EE 4002 taught by Professor Scalzo during the Fall '06 term at LSU.
 Fall '06
 Scalzo

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