4 Chopper-Controlled DC Motor Drive

• The normalized torque is
T
en
=
T
T
av
b
/ V
/ V
b
b
=
K
b
(dV
K
s
b
− K
I R
b
a
b
ωm
) /
/ V
b
V
b
=
dVn
− ω
R
an
mn
,
p.u.
I
R
where R
b a
an = , p.u. V
s
V
n = , p.u. ω
m
mn = , p.u.
b
Vb
ωb
• 4.9.2 Instantaneous steady-state computation
(including harmonics)
• The equations of the motor for on and off times
(continuous current conduction)
di
V E R i L
a
s = + a a + a
dt
di
0 = E + R i L
a
a a + a ,
dt
,
0
dT
≤
≤
t
t
V
≤
≤
dT
T
ω