equivalent circuit of a separately-excited dc motor · connected to separately excited dc motor 35...
TRANSCRIPT
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Equivalent Circuit of a Separately-Excited
DC Motor
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f
f f f f
aa a a a g
g v f
d t f a
d L
div R i L
dt
div R i L e
dt
e K i
T K i i
dT J B T
dt
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0
f f f
g v f
a a a g
a a a v f
d t f a
d L
d d
Steady state
d
dt
V R I
E K I
V R I E
V R I K I
T K I I
T B T
P T
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a a a v f
a a a a a a
v f f
v
f
V R I K I
V I R V I R
K I VK
R
Solve for the motor speed
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Control of the motor speed
• Control armature
voltage, Va
– Voltage control
• Control the field
current, If
– Current control
• Control the armature
current, Ia
a a a
f
v
f
V I R
VK
R
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Equivalent circuit of a DC Series Motor
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( )
( )
( )
g v a
a a f a g
a a f a v f
d t a f
d L
a a f a
v f
E K I
V R R I E
V R R I K I
T K I I
T B T
V R R I
K I
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Controlling the Motor Speed
• Control the armature
voltage, Va
• Control the armature
current, Ia
( )
( )
( )
g v a
a a f a g
a a f a v f
d t a f
d L
a a f a
v f
E K I
V R R I E
V R R I K I
T K I I
T B T
V R R I
K I
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Single phase semi-controlled converter fed
dc separately excited motor
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vOVm
0
iO
t
( )
t0
( )
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Speed-Torque Characteristics
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Single phase fully controlled converter fed
dc separately excited motor
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Speed-Torque Characteristics
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DC Series motor drive
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Single phase semi-controlled
converter fed dc series motor
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Speed-torque characteristics
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Single phase Fully controlled
converter fed dc series motor
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Speed-Torque Characteristics
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Three phase Half controlled converter
connected to separately excited DC motor
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ECE 442 Power Electronics 37
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ECE 442 Power Electronics 39
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Three phase fully controlled converter
connected to separately excited DC motor
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ECE 442 Power Electronics 42
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Where VL is rms value line voltage
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Torque Speed Characteristic 44
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DC series motor connected to 3 phase
half controlled bridge rectifier
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ECE 442 Power Electronics 47
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Equivalent Circuit
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Speed torque characteristics
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DC series motor connected to 3 phase
fully controlled bridge rectifier
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ECE 442 Power Electronics 50
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Equivalent circuit under steady state
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Under steady state condition the following equations hold good
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Torque speed curves for different firing angles
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