ELEMENTS OF
ELECTRICAL
ENGINEERING
ELECTRICAL
MACHINES
Shreya Paid
, ELECTRICAL
MACHINES -1
* SELF INDUCTION :
EMF :-& ✗I
Nd¥.
=
e. = -
10--10-5
¥1 It
e= -
'
LDI C:L self inductance)
-
e= -
--
dt
we baoue that ;
of N
magnetomotive force
LI =
-
mmf= Gs
=
reluctance)
of mnif =
s
4
N÷
=
s= I (µ -
permeability )
µA
÷
⇐
L
NLI÷M_A)
=
MEAL
( =
N2µoMIA_
=
,* MUTUAL INDUCTION :
Induced emf in second coil by first coil
E = N dot
dt
tl2=Nzd→z- linking flux .
at
tT2=N¥ _dd¥
'
-
Elz= Miz DII
( Mk
N¥0i4
- =
Fd
N2g÷2 N¥
Ml2= MZI =
'
C- &i2=&Ck ) )
N2÷12
Mn
N1k¥2
Mal
'
= =
N2&÷k
Ml2= My
=
N1N2_I2k
SIL
Wing Mmf 4×1
MILK
=
Mz,
=
1
of
NIS
=
N¥
Mr = '
I
Mir
N÷2k
=
Henley M=Mi Mr
-
:
(N¥z N¥21 )
Miz ✗ MU =
✗ k ✗ kz
,
M2lXM12= LI Lz K2
M = KULT
✓
coefficient of mutual inductance .
, MACHINES
state
# \ kinetic 1
a ← →
AC AC DC
a ✓ ↳ ✓ \
Transformer Inductor .
generator motor generator
motor left hand right hand
rule rule
* DC MACHINE :
Armature -
silicon steel
:&:¥*i÷
N
b & Mechanical protection •
Brush and
Yoke/_ Provides
I④←§
for flux commutator
I - path .
is
used to convert
.
,
Ac → ☐ e. It's
,
/ C - carbon used as a
rectifier
field ,
:-|
°
from
winding Brushes current
-
i commutator to ext
. circuit
Conductor
winding
WINDINGS
Lap winding
✓ ✓ wave
winding
-
Parallel -
2
parallel
-
A - P A- =
2
I
output is T P can lie
- -
no
any .
-
AVNI condition
lap A- p
A = No .
of parallel paths
wave A=2
P No
of polls
=
-
-
2- =
Total no .
of conductors
of = flux / pile
N
=
Rotational speed
ELECTRICAL
ENGINEERING
ELECTRICAL
MACHINES
Shreya Paid
, ELECTRICAL
MACHINES -1
* SELF INDUCTION :
EMF :-& ✗I
Nd¥.
=
e. = -
10--10-5
¥1 It
e= -
'
LDI C:L self inductance)
-
e= -
--
dt
we baoue that ;
of N
magnetomotive force
LI =
-
mmf= Gs
=
reluctance)
of mnif =
s
4
N÷
=
s= I (µ -
permeability )
µA
÷
⇐
L
NLI÷M_A)
=
MEAL
( =
N2µoMIA_
=
,* MUTUAL INDUCTION :
Induced emf in second coil by first coil
E = N dot
dt
tl2=Nzd→z- linking flux .
at
tT2=N¥ _dd¥
'
-
Elz= Miz DII
( Mk
N¥0i4
- =
Fd
N2g÷2 N¥
Ml2= MZI =
'
C- &i2=&Ck ) )
N2÷12
Mn
N1k¥2
Mal
'
= =
N2&÷k
Ml2= My
=
N1N2_I2k
SIL
Wing Mmf 4×1
MILK
=
Mz,
=
1
of
NIS
=
N¥
Mr = '
I
Mir
N÷2k
=
Henley M=Mi Mr
-
:
(N¥z N¥21 )
Miz ✗ MU =
✗ k ✗ kz
,
M2lXM12= LI Lz K2
M = KULT
✓
coefficient of mutual inductance .
, MACHINES
state
# \ kinetic 1
a ← →
AC AC DC
a ✓ ↳ ✓ \
Transformer Inductor .
generator motor generator
motor left hand right hand
rule rule
* DC MACHINE :
Armature -
silicon steel
:&:¥*i÷
N
b & Mechanical protection •
Brush and
Yoke/_ Provides
I④←§
for flux commutator
I - path .
is
used to convert
.
,
Ac → ☐ e. It's
,
/ C - carbon used as a
rectifier
field ,
:-|
°
from
winding Brushes current
-
i commutator to ext
. circuit
Conductor
winding
WINDINGS
Lap winding
✓ ✓ wave
winding
-
Parallel -
2
parallel
-
A - P A- =
2
I
output is T P can lie
- -
no
any .
-
AVNI condition
lap A- p
A = No .
of parallel paths
wave A=2
P No
of polls
=
-
-
2- =
Total no .
of conductors
of = flux / pile
N
=
Rotational speed
