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y
[
7
]
-
[
9
]
.
Du
e
to
its
lo
s
s
-
f
r
ee
s
o
u
r
ce
o
f
ex
citat
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t
h
e
ch
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o
f
FS
P
M
m
o
to
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is
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o
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ted
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o
r
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SV
ap
p
licatio
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r
t
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er
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o
r
e,
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e
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y
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m
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o
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t
o
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ic
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o
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e
r
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to
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is
class
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f
ied
i
n
to
to
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r
s
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t
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m
e
n
ted
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ely
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h
is
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r
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d
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g
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ter
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MSM
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er
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o
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m
a
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w
as
e
x
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t
[
1
0
]
-
[
1
2
]
.
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w
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1
3
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illu
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ates
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e
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n
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E
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m
2
0
1
4
-
2
0
2
4
[
5
].
T
h
er
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m
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d
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to
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ap
p
li
ca
tio
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o
f
f
lu
x
b
ar
r
ier
s
[
1
4
]
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r
th
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m
o
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ar
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at
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s
tato
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ip
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m
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n
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ir
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r
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g
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ess
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its
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o
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o
r
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licatio
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Fig
u
r
e
1
.
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x
a
m
p
les o
f
th
r
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p
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ase
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MSM
(
a)
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o
o
th
ed
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tato
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b
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m
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r
Fig
u
r
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2
.
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r
an
d
s
d
em
a
n
d
o
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tr
ic
s
co
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ter
s
[
5
]
2.
DE
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M
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NT
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I
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m
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1
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v
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g
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u
r
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3
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4
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(
Ou
ter
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1
.
M
ac
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Sp
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estrictio
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1
.
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Seg
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m
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t
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1
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1
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.
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ates
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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1
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4
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2
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Ra
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a
m
el
y
;
s
tato
r
an
d
r
o
to
r
r
esp
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tiv
el
y
[
1
8
]
.
Sp
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icall
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ter
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m
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[
1
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er
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t
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an
g
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r
atio
s
o
f
0
.
8
0
-
0
.
8
5
w
er
e
d
esig
n
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d
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m
p
ar
ed
w
h
ic
h
i
m
p
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t
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e
s
tato
r
p
o
s
s
es
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ed
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0
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-
8
5
%
o
f
ea
ch
m
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e
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ize
ac
co
r
d
in
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to
o
u
ter
r
o
to
r
d
esig
n
p
r
i
n
cip
l
e
[
2
0
]
.
T
h
e
h
i
g
h
e
s
t
v
alu
e
o
f
to
r
q
u
e
is
ac
co
m
p
lis
h
ed
w
h
e
n
th
e
r
atio
is
s
e
t
at
0
.
8
5
as
s
h
o
w
n
in
Fig
u
r
e
5
.
T
h
e
r
ef
o
r
e,
ap
p
r
o
p
r
iate
d
i
m
en
s
io
n
o
f
o
u
ter
s
tato
r
an
d
co
r
r
esp
o
n
d
in
g
r
o
to
r
is
r
eq
u
ir
ed
.
T
h
e
h
ig
h
est
to
r
q
u
e
f
o
r
th
e
in
itial
d
esi
g
n
i
s
ac
h
iev
ed
w
it
h
s
p
li
t r
atio
o
f
8
5
% (
0
.
8
5
)
,
th
u
s
it i
s
s
elec
ted
as
th
e
ap
p
r
o
p
r
iate
s
tato
r
to
r
o
to
r
d
esig
n
d
i
m
e
n
s
io
n
.
Fig
u
r
e
5
.
T
o
r
q
u
e
v
er
s
u
s
s
p
li
t r
atio
co
m
p
ar
is
o
n
3.
NO
-
L
O
AD
ANA
L
YSI
S
Un
d
er
n
o
-
lo
ad
an
al
y
s
is
te
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t,
a
r
m
atu
r
e
c
u
r
r
en
t
d
en
s
it
y
J
a
v
al
u
e
w
ill
b
e
s
e
t
J
a
=0
A
r
m
s
/
m
m
2
w
h
i
le
P
M
f
l
u
x
lin
k
ag
e
i
s
r
e
m
ai
n
in
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n
s
tan
t
th
r
o
u
g
h
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t
th
e
p
ap
er
.
A
s
a
r
esu
lt,
t
h
e
m
a
x
i
m
u
m
g
en
er
ated
f
l
u
x
li
n
es
a
n
d
f
l
u
x
d
is
tr
ib
u
tio
n
i
n
t
h
e
m
o
to
r
,
co
g
g
in
g
to
r
q
u
e,
a
n
d
in
d
u
ce
d
e
m
f
ar
e
co
m
p
r
eh
e
n
s
io
n
ex
a
m
i
n
ed
.
3
.
1
.
Co
il Ar
ra
ng
em
ent
T
e
s
t
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
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8
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IJ
PEDS
Vo
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8
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No
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4
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Dec
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b
er
2
0
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7
:
1
6
4
2
–
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6
4
9
1646
T
h
e
p
u
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f
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r
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co
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a
n
d
v
alid
ati
n
g
th
e
o
p
er
atio
n
FS
P
M
m
o
to
r
.
First
o
f
all,
all
w
i
n
d
in
g
s
ar
e
s
et
in
clo
ck
w
is
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tio
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u
r
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en
t
w
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ce
p
t
t
h
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ex
c
itatio
n
f
l
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x
f
r
o
m
t
h
e
P
M.
B
y
co
m
p
ar
in
g
t
h
e
f
lu
x
l
in
k
a
g
e
o
f
ea
c
h
a
r
m
atu
r
e
co
il
w
h
ich
m
u
s
t
b
e
1
2
0
d
eg
r
ee
s
ap
ar
t
m
ak
in
g
th
r
ee
-
p
h
a
s
e
b
alan
ce
s
y
s
te
m
a
s
U,
V
an
d
W
p
h
ases
.
T
h
ese
h
av
e
b
ee
n
co
m
b
i
n
ed
as s
h
o
w
n
i
n
Fi
g
u
r
e
6
.
3
.
2
.
Co
g
g
ing
T
o
rque
C
o
g
g
in
g
to
r
q
u
e
is
th
e
u
n
w
a
n
ted
to
r
q
u
e
th
at
ca
u
s
e
s
n
o
is
e
an
d
m
a
k
e
s
m
ac
h
in
e
to
v
ib
r
ate
d
u
r
in
g
m
o
to
r
o
p
er
atio
n
if
it
e
x
ce
ed
s
th
e
ac
ce
p
tab
le
r
a
n
g
e.
T
h
e
F
SP
M
m
o
to
r
f
o
r
p
u
r
e
elec
tr
ic
s
co
o
ter
p
r
o
p
u
ls
io
n
s
h
o
u
ld
b
u
ild
a
to
r
q
u
e
o
n
t
h
e
r
o
to
r
w
h
ic
h
i
s
ex
p
r
es
s
ed
in
E
q
u
atio
n
(
2
)
.
Me
an
w
h
ile,
t
h
e
a
cc
ep
tab
le
r
an
g
e
o
f
co
g
g
i
n
g
to
r
q
u
e
f
o
r
m
ac
h
in
e
s
a
f
e
o
p
er
atio
n
m
u
s
t
n
o
t e
x
ce
ed
1
0
% o
f
t
h
e
a
v
er
ag
e
to
r
q
u
e
[
2
1
]
.
Fig
u
r
e
7
p
r
ese
n
t
s
th
e
co
g
g
i
n
g
to
r
q
u
e
p
ea
k
-
to
-
p
e
ak
o
f
th
e
m
o
to
r
u
n
d
er
s
t
u
d
y
g
e
n
er
ated
b
y
t
h
e
P
M
at
t
h
e
r
o
tat
io
n
o
f
2
5
elec
tr
ical
d
eg
r
ee
s
h
av
i
n
g
s
ix
elec
tr
ical
c
y
cle
s
.
Ho
w
e
v
er
,
t
h
is
to
r
q
u
e
v
alu
e
is
ex
p
ec
ted
to
r
ed
u
ce
d
u
r
i
n
g
d
esi
g
n
i
m
p
r
o
v
e
m
en
t a
n
d
o
p
ti
m
izatio
n
.
c
o
g
g
a
v
g
T
T
T
(
2
)
w
h
er
e
,
T
avg
an
d
T
cogg
ar
e
th
e
av
er
ag
e
g
en
er
ated
to
r
q
u
e
an
d
r
elate
d
co
g
g
i
n
g
to
r
q
u
e
r
esp
ec
ti
v
el
y
.
I
t
i
s
n
ec
e
s
s
ar
y
to
s
p
ec
if
y
t
h
at
en
er
g
y
alter
ati
o
n
in
s
id
e
th
e
elec
tr
ic
m
o
to
r
cr
ea
ted
b
y
t
h
e
m
o
v
e
m
e
n
t
o
f
r
o
to
r
r
esu
lts
co
g
g
in
g
to
r
q
u
e
.
Fig
u
r
e
6
.
T
h
r
ee
-
p
h
ase
2
4
s
lo
t
-
1
4
p
o
le
m
ag
n
etic
f
l
u
x
lin
k
ag
e
p
r
o
d
u
ce
d
b
y
t
h
e
P
M
Fig
u
r
e
7
.
C
o
g
g
i
n
g
to
r
q
u
e
o
f
2
4
s
lo
t
-
1
4
p
o
le
FS
P
M
Mo
to
r
3
.
3
.
F
lux
L
ines
a
nd
d
is
t
rib
u
t
io
n
An
o
th
er
lo
ad
-
an
a
l
y
s
is
f
o
r
e
x
a
m
i
n
atio
n
ar
e
f
l
u
x
li
n
es
an
d
f
l
u
x
d
is
tr
ib
u
tio
n
f
o
r
p
r
o
p
o
s
ed
2
4
s
lo
t
-
1
4
p
o
le
FS
P
M
m
o
to
r
.
T
h
e
i
m
p
r
ess
io
n
b
eh
i
n
d
f
l
u
x
lin
e
s
is
to
m
o
n
ito
r
th
e
f
lo
w
o
f
f
lu
x
,
w
h
i
le
f
lu
x
d
is
tr
ib
u
tio
n
r
ef
lects
th
e
in
f
l
u
e
n
ce
o
f
f
l
u
x
c
ap
ac
it
y
an
d
s
at
u
r
atio
n
i
n
t
h
e
m
o
to
r
.
I
t is s
h
o
w
n
f
r
o
m
F
ig
u
r
e
8
th
at
t
h
e
f
l
u
x
li
n
es
m
ak
e
s
h
o
r
t
to
u
r
f
r
o
m
th
e
i
n
n
e
r
s
tato
r
to
o
th
to
o
u
ter
r
o
to
r
p
o
le,
lin
k
w
it
h
i
t
a
n
d
b
ac
k
i
n
to
t
h
e
n
ex
t
s
tato
r
to
o
th
p
o
le
an
d
m
a
k
i
n
g
a
b
ip
o
lar
f
l
u
x
li
n
k
ag
e
a
n
d
co
m
p
leti
n
g
f
u
ll
c
y
c
le.
I
n
th
e
s
a
m
e
v
ei
n
,
f
l
u
x
i
s
s
ee
n
to
b
e
d
is
tr
ib
u
ted
th
r
o
u
g
h
o
u
t t
h
e
s
tat
o
r
teeth
an
d
r
o
to
r
w
h
ic
h
ca
u
s
e
s
h
i
g
h
f
l
u
x
lin
k
a
g
e
an
d
f
lu
x
d
en
s
it
y
o
f
2
.
2
8
T
.
Fig
u
r
e
8
.
Flu
x
lin
e
s
an
d
f
lu
x
d
is
tr
ib
u
tio
n
o
f
2
4
s
lo
ts
-
1
4
p
o
le
FS
P
M
m
o
to
r
Evaluation Warning : The document was created with Spire.PDF for Python.
I
J
PEDS
I
SS
N:
2088
-
8
694
Hig
h
To
r
q
u
e
F
lu
x
S
w
itch
in
g
P
erma
n
en
t Ma
g
n
et
Ma
ch
in
e
in
S
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ted
Ou
ter
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(
E
n
w
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m
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a
d
iw
e
I
)
1647
3
.
4
.
I
nd
uced
B
a
ck
-
E
m
f
T
h
e
ter
m
in
d
u
ce
d
b
ac
k
-
e
m
f
,
is
th
e
v
o
lta
g
e
th
at
o
cc
u
r
s
i
n
elec
tr
ic
m
o
to
r
s
w
h
er
e
th
er
e
is
r
elativ
e
m
o
tio
n
b
et
w
ee
n
th
e
ar
m
atu
r
e
o
f
th
e
m
o
to
r
an
d
th
e
m
a
g
n
et
ic
f
ield
f
r
o
m
t
h
e
m
o
to
r
's
f
ield
m
ag
n
ets,
o
r
w
i
n
d
i
n
g
s
.
T
h
is
v
o
ltag
e
s
o
p
r
o
d
u
ce
d
o
p
p
o
s
es
th
e
c
u
r
r
en
t
f
lo
w
i
n
g
t
h
r
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u
g
h
th
e
co
il,
w
h
e
n
t
h
e
ar
m
a
tu
r
e
r
o
tates.
Fo
r
2
4
s
lo
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-
1
4
p
o
le
FS
P
M
m
o
t
o
r
u
n
d
er
s
tu
d
y
,
P
M
g
en
er
ated
in
d
u
ce
d
v
o
lta
g
e
s
w
it
h
th
e
s
p
ee
d
o
f
1
9
0
0
r
ev
/
m
i
n
u
n
d
er
o
p
en
cir
cu
it
co
n
d
itio
n
is
illu
s
tr
ated
in
Fi
g
u
r
e
9
.
I
t
h
as
t
h
e
a
m
p
lit
u
d
e
o
f
r
o
u
g
h
l
y
2
1
0
.
V
lad
ed
w
it
h
h
ar
m
o
n
ics
w
h
ic
h
w
ill b
e
i
m
p
r
o
v
ed
in
d
esig
n
r
ef
in
e
m
e
n
t a
n
d
o
p
tim
iza
tio
n
.
Fig
u
r
e
9
.
I
n
d
u
ce
d
b
ac
k
-
E
MF
o
f
2
4
s
lo
t
-
1
4
p
o
le
FS
P
M
m
o
to
r
4
.
L
O
AD
ANALYS
I
S
Un
d
er
lo
ad
an
al
y
s
i
s
,
th
e
c
u
r
r
en
t
d
en
s
it
y
is
in
j
ec
ted
in
to
t
h
e
ar
m
a
tu
r
e
co
il
a
n
d
v
ar
ied
f
r
o
m
J
a
o
f
5
A
/
m
m
2
to
m
a
x
i
m
u
m
v
al
u
e
o
f
3
0
A
/
m
m
2
to
ex
a
m
i
n
e
to
r
q
u
e
an
d
s
p
ee
d
ch
ar
ac
ter
is
tic
s
.
Fu
r
t
h
er
m
o
r
e,
t
h
e
co
m
p
u
tatio
n
o
f
to
r
q
u
e
an
d
p
o
w
er
an
d
f
i
n
all
y
,
t
h
e
e
f
f
ic
ien
c
y
o
f
m
o
to
r
.
4
.
1
.
T
o
rque
a
t
Va
rio
us
Ar
m
a
t
ure
Curre
nt
Densi
t
ies
T
h
e
av
er
ag
e
o
u
tp
u
t
to
r
q
u
e
o
f
th
e
m
o
to
r
u
n
d
er
s
tu
d
y
is
e
x
a
m
i
n
ed
at
v
ar
io
u
s
t
h
e
ar
m
atu
r
e
cu
r
r
en
t
d
en
s
itie
s
.
T
h
e
o
b
tain
ed
r
esu
lts
ar
e
illu
s
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A
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p
l
ica
ti
o
n
s,
p
p
.
1
-
6
,
M
a
y
2
0
0
9
.
[3
]
K.
I.
L
a
sk
a
ris
a
n
d
A
.
G
.
Kla
d
a
s,
“
In
terio
r
P
e
rm
a
n
e
n
t
M
a
g
n
e
t
M
o
to
r
De
sig
n
f
o
r
El
e
c
tri
c
V
e
h
icle
Driv
e
,
”
IEE
E
T
ra
n
a
c
ti
o
n
s o
n
In
d
u
stri
a
l
E
lec
tro
n
ics
,
v
o
l.
5
7
,
p
p
.
1
3
8
-
1
4
5
,
Ja
n
.
2
0
1
0
.
[4
]
El
e
c
tri
c
S
c
o
o
ters
M
a
rk
e
t
B
y
P
r
o
d
u
c
t,
2
0
1
4
,
A
v
a
il
a
b
le
On
li
n
e
:
h
tt
p
:/
/w
ww
.
g
ra
n
d
v
ie
w
re
s
e
a
r
c
h
.
c
o
m
/i
n
d
u
stry
-
a
n
a
ly
sis/e
lec
tri
c
-
s
c
o
o
ters
-
m
a
rk
e
t
,
2
0
1
4
.
[5
]
X
.
Q.
Zh
u
,
“
S
w
it
c
h
e
d
F
lu
x
P
e
r
m
a
n
e
n
t
M
a
g
n
e
t
M
a
c
h
in
e
s
In
n
o
v
a
ti
o
n
Co
n
ti
n
u
e
s,”
in
Pro
c
.
In
ter
n
a
ti
o
n
a
l
C
o
n
f
.
o
n
El
e
c
trica
l
M
a
c
h
in
e
s
S
y
ste
ms
,
p
p
.
1
-
1
0
,
A
u
g
u
st 2
0
1
1
.
[6
]
W
.
F
e
i,
e
t
a
l.
,
“
De
sig
n
a
n
d
A
n
a
l
y
sis
o
f
a
Ne
w
Ou
ter
Ro
to
r
P
e
rm
a
n
e
n
t
M
a
g
n
e
t
F
lu
x
S
w
it
c
h
in
g
M
a
c
h
in
e
f
o
r
El
e
c
tri
c
V
e
h
icle
P
ro
p
u
lsio
n
,
”
T
h
e
In
ter
n
a
ti
o
n
a
l
J
o
u
rn
a
l
fo
r
C
o
mp
u
ta
ti
o
n
a
n
d
M
a
t
h
e
ma
ti
c
s
in
El
e
c
trica
l
a
n
d
E
lec
tro
n
i
c
En
g
i
n
e
e
rin
g
(
COM
PE
L
),
v
o
l.
3
0
,
p
p
.
4
8
-
6
1
,
2
0
1
1
.
[7
]
E.
S
u
laim
a
n
,
e
t
a
l
.
,
“
In
v
e
stig
a
t
io
n
o
f
F
ield
Ex
c
it
a
ti
o
n
S
w
it
c
h
e
d
F
lu
x
M
o
to
r
w
it
h
S
e
g
m
e
n
tal
Ro
to
r,
”
IEE
E
Co
n
fer
e
n
c
e
o
n
Clea
n
E
n
e
rg
y
a
n
d
T
e
c
h
n
o
l
o
g
y
(
CEA
T
),
p
p
.
3
1
7
-
3
2
2
,
2
0
1
3
.
[8
]
M
.
Ch
e
n
g
,
e
t
a
l
.
,
“
Ov
e
rv
ie
w
o
f
S
tato
r
P
e
rm
a
n
e
n
t
M
a
g
n
e
t
Bru
sh
les
s
M
a
c
h
in
e
s,”
IEE
E
T
ra
n
sa
c
ti
o
n
s
o
n
In
d
u
stri
a
l
El
e
c
tro
n
ics
,
v
o
l.
5
8
,
p
p
.
5
0
8
7
-
5
1
0
1
,
N
o
v
.
2
0
1
1
.
[9
]
M
.
Z.
A
h
m
a
d
,
e
t
a
l
.
,
“
P
re
li
m
in
a
ry
S
tu
d
ies
o
n
a
Ne
w
Ou
ter
Ro
to
r
P
e
rm
a
n
e
n
t
M
a
g
n
e
t
F
lu
x
S
w
it
c
h
in
g
M
a
c
h
in
e
w
it
h
H
y
b
rid
Ex
c
it
a
ti
o
n
F
l
u
x
f
o
r
Dire
c
t
Driv
e
EV
A
p
p
li
c
a
ti
o
n
,
”
in
Pr
o
c
.
IEE
E
In
t
Co
n
fer
e
n
c
e
o
n
,
Po
we
r a
n
d
En
e
rg
y
,
p
p
.
928
-
9
3
3
,
De
c
.
2
0
1
2
.
[1
0
]
P
.
J.
L
a
w
r
e
n
so
n
a
n
d
S
.
K
G
u
p
t
a
,
“
De
v
e
lo
p
m
e
n
ts
in
th
e
P
e
rf
o
r
m
a
n
c
e
a
n
d
T
h
e
o
ry
o
f
se
g
m
e
n
tal
-
ro
to
r
re
l
u
c
tan
c
e
m
a
c
h
in
e
s,”
IEE
Pro
c
e
e
d
in
g
s,
v
o
l
.
1
1
4
,
1
9
6
7
.
[1
1
]
B.
C.
M
e
c
ro
w
,
e
t
a
l
.
,
“
S
e
g
m
e
n
tal
Ro
to
r
S
w
it
c
h
e
d
Re
lu
c
tan
c
e
M
o
to
rs
w
it
h
S
i
n
g
le
T
o
o
th
W
in
d
i
n
g
s,”
Pro
c
.
In
st.
El
e
c
trica
l
Po
we
r A
p
p
li
c
a
ti
o
n
s,
v
o
l.
1
5
0
,
p
p
.
5
9
1
-
5
9
9
,
2
0
0
3
.
[1
2
]
Z.
A
k
i
m
a
n
d
B.
C.
M
e
c
ro
w
,
“
P
e
r
m
a
n
e
n
t
M
a
g
n
e
t
F
lu
x
S
w
it
c
h
in
g
S
y
n
c
h
ro
n
o
u
s
M
o
to
r
Em
p
lo
y
in
g
a
S
e
g
m
e
n
tal
Ro
to
r”
,
I
EE
T
r
a
n
sa
c
ti
o
n
s
o
n
In
d
u
stria
l
A
p
p
li
c
a
ti
o
n
s
,
2
0
1
2
.
[1
3
]
B.
C.
M
e
c
ro
w
,
e
t
a
l
.
,
“
T
h
e
Us
e
o
f
S
e
g
m
e
n
tal
Ro
to
rs
f
o
r
2
-
P
h
a
se
F
l
u
x
S
w
it
c
h
in
g
M
o
t
o
rs,”
P
r
o
c
.
I
n
te
rn
a
ti
o
n
a
l
C
o
n
f
.
o
n
E
lec
trica
l
M
a
c
h
i
n
e
s,
(
ICEM
)
,
2
0
0
6
.
[1
4
]
M
.
G
e
lea
,
e
t
a
l
.
,
“
De
sig
n
Co
n
sid
e
ra
ti
o
n
f
o
r
a
n
Ou
ter
Ro
to
r
F
ield
W
o
u
n
d
F
lu
x
S
w
it
c
h
in
g
M
a
c
h
in
e
,
”
In
ter
n
a
ti
o
n
a
l
Co
n
fer
e
n
c
e
o
n
El
e
c
trica
l
M
a
c
h
in
e
s,
(
ICEM
)
,
2
0
1
2
.
[1
5
]
A
.
Zu
lu
,
“
F
l
u
x
S
w
it
c
h
in
g
M
a
c
h
in
e
u
sin
g
S
e
g
m
e
n
tal
Ro
to
r,
”
Ph
.
D,
T
h
e
sis,
Un
ive
rs
it
y
o
f
Ne
wc
a
stle
,
2
0
1
0
.
[1
6
]
M
.
F
.
Om
a
r,
e
t
a
l
.
,
“
Co
m
p
a
riso
n
Be
twe
e
n
S
in
g
le
-
P
h
a
se
a
n
d
T
h
re
e
-
P
h
a
se
F
EF
S
M
w
it
h
No
n
-
Ov
e
rlap
W
in
d
in
g
s
a
n
d
S
a
li
e
n
t
Ro
to
r,
”
A
RP
N
J
o
u
rn
a
l
o
f
En
g
i
n
e
e
rin
g
a
n
d
A
p
p
li
e
d
S
c
ien
c
e
s
,
2
0
1
3
.
[1
7
]
F
.
Kh
a
n
,
e
t
a
l
.
,
“
In
v
e
stig
a
ti
o
n
o
f
f
ield
e
x
c
it
a
ti
o
n
sw
it
c
h
e
d
f
lu
x
ro
to
r
w
it
h
se
g
m
e
n
tal
ro
to
r,
”
IEE
E
Co
n
fer
e
n
c
e
o
n
Clea
n
E
n
e
rg
y
a
n
d
T
e
c
h
n
o
lo
g
y
(
CEA
T
)
,
N
o
v
.
2
0
1
3
.
[1
8
]
E.
B.
A
g
a
m
lo
h
a
n
d
A
.
Ca
v
a
g
n
in
o
,
“
Hig
h
Ef
f
icie
n
c
y
De
sig
n
o
f
In
d
u
c
ti
o
n
M
a
c
h
i
n
e
s
f
o
r
In
d
u
strial
A
p
p
li
c
a
ti
o
n
s,”
in
Pro
c
e
e
d
in
g
o
f
I
EE
E
W
o
rk
sh
o
p
o
n
E
lec
trica
l
M
a
c
h
i
n
e
s
De
sig
n
Co
n
tro
l
a
n
d
Di
a
g
n
o
sis
(
W
EM
D
CD),
p
p
.
3
3
-
4
6
,
M
a
r.
2
0
1
1
.
[1
9
]
M
.
S
h
ira
n
ia,
e
t
a
l
.
,
“
A
Re
v
ie
w
o
n
Re
c
e
n
t
A
p
p
li
c
a
ti
o
n
s
o
f
Bru
sh
l
e
ss
DC
El
e
c
tri
c
M
a
c
h
in
e
s
a
n
d
th
e
ir
P
o
ten
ti
a
l
i
n
En
e
rg
y
S
a
v
in
g
,
”
En
e
rg
y
Eq
u
i
p
me
n
t
S
y
ste
ms
,
v
o
l
.
3
,
p
p
.
5
7
-
7
1
,
Ja
n
.
2
0
1
5
.
[2
0
]
E.
Ho
a
n
g
,
e
t
a
l
.
,
“
S
w
it
c
h
in
g
F
lu
x
P
e
rm
a
n
e
n
t
M
a
g
n
e
t
P
o
ly
-
P
h
a
se
d
S
y
n
c
h
ro
n
o
u
s
M
a
c
h
i
n
e
s,”
in
Pr
o
c
e
e
d
in
g
o
f
7
t
h
Eu
ro
p
e
a
n
C
o
n
fer
e
n
c
e
o
n
P
o
we
r
El
e
c
tro
n
ics
a
n
d
Ap
p
li
c
a
ti
o
n
s
(
EP
E)
,
v
o
l.
3
,
p
p
.
9
0
3
–
9
0
8
,
S
e
p
.
1
9
9
7
.
[2
1
]
Z.
Q.
Zh
u
,
e
t
a
l.
,
“
A
n
a
ly
sis
o
f
a
No
v
e
l
M
u
lt
i
T
o
o
t
h
F
l
u
x
S
w
it
c
h
in
g
P
M
Bru
s
h
les
s
a
.
c
M
a
c
h
in
e
f
o
r
Hig
h
T
o
rq
u
e
Dire
c
t
Driv
e
A
p
p
li
c
a
ti
o
n
s”
,
IE
EE
T
ra
n
s
a
c
ti
o
n
s o
n
M
a
g
n
e
ti
c
s,
v
o
l.
4
4
,
p
p
.
4
3
1
3
-
4
3
1
6
,
N
o
v
.
2
0
0
8
.
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