ac-dc converters or rectifiers
DESCRIPTION
Fixed voltage 1 or 3- phase ac. Fixed voltage 1 or 3-phase ac. Fixed voltage dc. Variable voltage dc. Diode rectifier. Fully controlled thyristor rectifier. Fixed voltage dc. Fixed voltage 1 or 3- phase ac. Variable. Fixed voltage 1 or 3- phase ac. Rectifier with Self Commutated - PowerPoint PPT PresentationTRANSCRIPT
AC-DC Converters or Rectifiers
Fixed voltage1 or 3- phase ac
Diode rectifierFixed voltage dc
Fixed voltage 1 or 3-phase ac
Fully controlled thyristor rectifier
Variable voltage dc
Fixed voltage1 or 3- phase ac
Half-controlledthyristor rectifier
Variable voltage dc
Fixed voltage 1 or 3- phase ac
Transformer with taps
Diode rectifier
Variable
Voltage dc
Variable Voltage ac
Fixed voltage1 or 3- phase ac
Rectifier with Self Commutated
devices
Variable
Voltage dcFixed voltage1 or 3- phase ac
Diode rectifier
chopperVariable Voltage dc
Fixed voltage dc
Variable voltage dc
Ac motor
Fixed voltage ac
Dc generator
f
Diode rectifier
Variable voltage dc
Ac motor
Fixed voltage
1 or 3-phase ac
Magnetic amplifier
Diode rectifier
variable
Voltage dc
Fixed voltage
3-phase acAmplidyne
variable
Voltage dc
Ac voltage controllers
Fixed voltage
3-phase ac
Autotransformer Of fixed turns
ratio
Lower (fixed)
Ac voltage
Fixed voltage
3-phase ac
Transformer with taps
variable
Voltage ac
Fixed voltage
3-phase acMagnetic amplifier
variable
Voltage ac
Fixed voltage
3-phase ac
Thyristor voltage controllers
variable
Voltage ac
Fixed voltage dc
Semiconductor chopper
variable
Voltage dc
DC supply
chopperSix step inverter
IML
CVd
Filterl d
Dc link
chopperAC supply
Six step inverter
IML
CVd
Filter
Dc link
l d
PWM inverter IML
CVd
Filter
Dc link
l d
DC supply
Diode bridgeAC supply PWM inverter IM
LC
Vd
Filter
Dc link
l d
Ld
Fully controlled
rectifierCSIVd
Dc link Induction
motor
chopper CSIVd
Dc link Induction
motor
DC supply
ACsupply
Vds
3-phase
Ac supply
ldL d
Vdl
T1T
3 T5
T2T6T4
Source side converter Load side converter
Synchronous motor
o
wm
TF
wm
o
Ts
Ts
Tv Tc
TvTc
Tor que
o
+ w
+T
T L
-T
-w
olT
oTl
wmwm
p
t
p
t
p
p
tt
Reverse motion
Forward motion
P
t
P
Motor
IL
v
w
Dry
Friction
Viscous
Fan
Friction
wL
vm
L T
P= f (t)N= f (t)
P= f (N)
N
P
P 2
1
t1 t
2 P, t
Loaded cage
TL I
IV
TL
Counterweight
Loaded cage
ForwardMotoring
CounterweightCounterweight
Emptycage
IIIReverse
Motoring
Load torque with loaded cage
Load torque with empty cage
Counterweight
Emptycage
II
TT1
Fig. 2.10. Motor- load system
Motor Load
TL
TM
W
V
M
Fig. 2.12 Motor-hoist load system
-T -T
TL
TL
Stiction
+i
TL
Fig. 2.2. Speed torque curve of dry friction load Fig. 2.3. Speed torque curves of Viscous friction load.
++
- -
-T +T -T +T
Fig. 2.4. Speed torque curve of a fan type load. Fig. 2.5. Speed torque curve of a constant power load
2
1
hFig.2.6. Forces during the upgradient motion of a train, Fig.2.7. Hoisting .mechanism
F W
Jn, n
M N
i1
i2
in
J1,
1
J2,
2
TL
Fig.2.11. Motor-Load system with gears.
TL
Te
ONE PERIOD
Fig.2. 8. Speed-torque characteristic of a reciprocating compressor.