speed control methods of three phase induction motor pdf
Design and Implementation of a Three-Phase Induction Motor Control Scheme
Ngày tải lên :
27/10/2013, 23:15
... of the degree of Bachelor of Engineering (Honours)
in the division of Electrical Engineering, I present the following thesis entitled “Design
and Implementation of a Three- Phase Induction Motor ... a control strategy that varies the frequency and voltage of the
signal applied to the windings of the induction motor, while controlling the flux created
in the air-gap of the induction motor. ... designed to control a brush-less DC motor. However, by
constructing a feedback loop that can detect the outputs of an induction motor, we
can use this motor controller to control an induction...
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Current control techniques for three phase voltage source PWM converters a survey
Ngày tải lên :
03/01/2014, 19:45
... Block scheme of FL controller, (b) control surface of con-
ventional PI controller, (c) control surface of FL controller; comparison of
current-tracking performance with PI and FL controller: ... FL-tuned PI controller can easily be implemented
as an off-line precalculated three- dimensional lookup table
consisting of the control surface [114]. However, the properties
of the FL controller ... hysteresis
modulation methods for VSI current control, ” in Proc. IEE Machines
and Drives Conf., London, U.K., 1988, pp. 336–339.
[45] V. J. Gosbell and P. M. Dalton, “Current control of induction motors at
low speed, ”...
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Báo cáo "Determining thermal expansion coefficients of three-phase fiber composite material reinforced by spherical particles " potx
Ngày tải lên :
28/03/2014, 13:20
... coefficients of three- phase composite material more
than that of two - phase composite material in [7]. So, embedding spherical inclusions into continous
matrix phase of two - phase fiber composite ... coefficients of matrix and particle phase.
2 3
,
K K
: bulk moduli of matrix and particle phase.
2 2
G
à
=
: shear modulus of matrix phase.
3
ξ
: volume fraction of particle phase.
2
α
: ... coefficients of three- phase composite
material. This resembles case 3 when letting volume fraction of the fibre phase be constant and
increasing step by step volume fraction of the particle phase. ...
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Tài liệu Methods of Payment in International Trade pdf
Ngày tải lên :
19/01/2014, 11:20
... Methods of Payment in International Trade
This guide explains the different methods of getting paid and the different levels of risks involved.
You should note that none of the methods ... are
to be made, possibly as part of an agreed schedule. However, they do not offer the documentary
control of Letters of Credit to buyers and, as such they are an unconditional guarantee.
Other ... some research?
On the basis of this information, the exporter can start to think about his stance in terms of the
payment risk ladder.
5
SITPRO Financial Guide: Methods of Payment in International...
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Tài liệu ime Control of a Three Phase 4 Wire PWM Inverter with Variable DC Link Voltage and Battery Storage for PV Application doc
Ngày tải lên :
19/01/2014, 02:20
... volt
e
sult of the
c
capacitor v
o
w
=2000
Ω
)
a
t
s of the dea
e
inverter c
u
r
due to loa
d
g
ure 5 show
s
o
ltage of the
R
v
=20Ω , R
w
y
namic perf
o
age is quick
c
ontrollable
o
ltage of ... o
n
h
e LC filter
a
n
ces is elim
i
a
lidity of th
e
m
ore attenti
o
n
large centr
a
e
te Ti
m
M
In
v
g
e an
d
.
Said El-
B
a
r
o
l of a three
p
o
f three pha
s
n
with batter
y
o
f a photovo
l
v
oltage ... cas
e
er of PV ge
n
r
ature and cl
ition it is ne
V-I charac
t
by the DC/
D
o
al of the s
y
h
constant a
m
p
oint of the
u
e to load u
n
a
nd midpoi
n
s
problem t
h
d
ing to load
a
r region of...
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Direct control methods for matrix converter and induction motor
Ngày tải lên :
13/05/2014, 00:55
... loop control [1],
[5]. Another topic of great interest is the closed loop
control of a drive system consisting of matrix converter
and induction machine. Slip control and field oriented
control ... basic ideas of the
three control methods mentioned above will be outlined,
starting with Direct Torque Control and Sliding Mode
Control, as these methods use the same switch
configurations of the ... are
the basics of Direct Torque Control, Direct Current Control
and Sliding Mode Control of matrix converters.
I. INTRODUCTION
In recent years many research results on control
methods for matrix...
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Tài liệu A neural-network-based space-vector PWM controller for a three-level voltage-fed inverter induction motor drive doc
Ngày tải lên :
22/12/2013, 08:16
... Network Toolbox. The performance of an
open-loop volts/Hz speed- controlled induction motor drive has
been evaluated with the ANN-based modulator and compared
with that of a conventional DSP-based ... space-vector PWM controller.
Fig. 8. Segmentation of neural network output for
U
-phase
P
states.
and signals only. Similar operations are
performed with the
and signals of all the phases and all ... imple-
mentation of a three- level voltage-fed inverter. In the begin-
ning, SVM theory for a three- level inverter is reviewed briefly.
The general expressions of time segments of inverter voltage
vectors...
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Tài liệu Mechatronics DC Motor / Tachometer Closed-Loop Speed Control System ppt
Ngày tải lên :
25/01/2014, 13:20
... Furthermore, the control of AC actuators was a difficult task at that time.
Today, AC motors are also widely used as servo-motors, employing modern methods of phase-
voltage control and frequency control ... angular
speed
ω
c
.
Mechatronics Kevin Craig
DC Motor / Tachometer Closed-Loop Speed Control System 12
7. Control Design
The objective of the exercise is to control the angular speed of the ...
A schematic diagram of a DC motor is shown in Figure 6.
Figure 6. Schematic Diagram of a DC Motor
Mechatronics Kevin Craig
DC Motor / Tachometer Closed-Loop Speed Control System 10
...
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báo cáo hóa học: " Clinical assessment of the physical activity pattern of chronic fatigue syndrome patients: a validation of three methods" pptx
Ngày tải lên :
18/06/2014, 19:20
... the validity of the API (0.643) was
somewhat smaller than that of the two questionnaires
(0.710 and 0.711). Following the method of Hanley and
Mc Neil [22], the validity of the three instruments ... practice? Which of the
three instruments could best be used if no actometers are
available? Although the validity of the three instruments
appeared to be fair, and hence in fact none of the instru-
ments ... patient of phys-
ical activity. Another option could be to include the opin-
ion of a direct partner of the patients in the reporting of
daily activities.
Conclusion
To conclude, the results of this...
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Báo cáo lâm nghiệp: " Comparison of three methods to determine optimal road spacing for forwarder-type logging operations" pdf
Ngày tải lên :
07/08/2014, 04:20
... constant hourly machine
cost regardless of the load or speed. en the sum
of roading cost and forwarding cost was plotted as
a function of road spacing. e sum of roading cost
and travelling cost ...
S optimal road spacing (m),
C
road
– cost of the construction and maintenance of 1 m road
length (€/m),
C
travel
– cost of travelling of 1 m
3
of logs to 1 m distance
(€/m
3
/m),
V – stand ... time of 9.98 min per cycle for an average
forwarding distance of 96.64 m was used. e time
of extraction per m distance was 0.1033 min for
favourable trail conditions. Using the hourly cost of...
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Báo cáo lâm nghiệp: "Evaluation of three methods for estimating the Weibull distribution parameters of Chinese pine (Pinus tabulaeformis)" pps
Ngày tải lên :
07/08/2014, 10:22
... aspect of estimated performance, the LSM
and the MLE of fitting Weibull function were also
good methods because the methods are easy and
quick estimates well as there exists a lot of software ...
stands of western conifers. Canadian Journal of Forest
Research, 13: 85–88.
LIU C.M., ZHANG S.Y., LEI Y., ZHANG L.J., 2004. Com-
parison of three methods for predicting diameter distri-
butions of ... MLE, MOM
and LSM methods in order to consistently compare
the three different estimators.
Methods of estimation
e probability and cumulative distribution func-
tions of the three- parameter Weibull...
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Báo cáo khoa học: " Comparison of three cold storage methods for Norway spruce (Picea abies Karst) bare root seedlings: consequences on metabolic activity of ectomycorrhizae assessed by radiorespirometry" pdf
Ngày tải lên :
08/08/2014, 23:22
... Original
article
Comparison
of
three
cold
storage
methods
for
Norway
spruce
(Picea
abies
Karst)
bare
root
seedlings:
consequences
on
metabolic
activity
of
ectomycorrhizae
assessed ...
or
extension
of
these
populations
on
the
root
system
after
plan-
tation
(Al
Abras
et al,
1988b).
In
this
paper,
we
compare
the
metabolic
activity
of
2
types
of
Norway
spruce ...
to
characterize
the
metabolic
activity
of
the
ectomycorrhi-
zae.
MATERIALS
AND
METHODS
Plant
material
Four-year
old
bare
root
seedlings
of
Picea
excel-
sa
(Lam)
Link,
grown...
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- 0
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