
3-6 Power Electronics and Motor Drives
As stator and rotor winding inductance matrices, given with (3.4), do not contain rotor-position-depen-
dent coecients, Equation 3.8 reduces for smooth air-gap multiphase machines to
T P i
d L
i
e s
t sr
r
= [ ]
[ ]
[ ]
θ
(3.10)
is
m
eans
t
hat,
i
n
m
achines
w
ith
u
niform
a
ir-gap,
e
lectromagnetic
to
rque
i
s
s
olely
c
reated
d
ue
to
t
he
i
nteraction of the stator and rotor windings.
Any
m
ultiphase
i
nduction
m
achine
i
s
c
ompletely
d
escribed,
i
n
t
erms
o
f
p
hase
v
ariables
(
or,
a
s
i
t
i
s
s
aid,
i
n
t
he
o
riginal
p
hase
d
omain)
w
ith
t
he
m
athematical
m
odel
g
iven
w
ith
(
3.1)
t
hrough
(
3.8)
(
or
(
3.10)
i
nstead
o
f
(
3.8)
)
.
e
m
odel
i
s
c
om ...