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本科毕业设计(论文)
中英文对照翻译
院(系部)
电气工程与自动化
专业名称
电气工程及其自动化
年级班级
学生姓名
指导老师
p>
2013
年
6
月<
/p>
1
日
Elevator System Based on PLC
Composed
by
the
order
of
relay
control
system
is
a
realization
of
the
first
elevator
control
method.
However,
to
enter
the
nineties,
with
the
development
of
science
and
technology
and the
widespread
application of
computer technology, the safety of
elevators,
reliability
of
the
increasingly
high
demand
on
the
relay
control
weaknesses
are
becoming
evident.
Elevator
control
system
relays
the
failure
rate
high,
greatly
reduces
the
reliability
and
safety of elevators, and escalators
stopped often to take with the staff about the
inconvenience
and fear. And the event
rather than taking the lift or squat at the end of
the lift will not only
cause damage to
mechanical components, but also personal accident
may occur.
Programmable Logic
Controller (PLC) is the first order logic control
in accordance with
the
needs
of
developed
specifically
for
industrial
environment
applications
to
operate
the
electronic
digital
computing
device.
The
PLC
biggest
characteristics
lie
in:
The
electrical
engineering
teacher already no longer electric hardware up too
many calculations of cost, as
long as
order the importation that the button switch or
the importation of the sensors order to
link the PLC up can solve problem, pass
to output to order the conjunction contact machine
or
control the start equipments of the
big power after the electric appliances, but the
exportation
equipments direct
conjunction of the small power can.
PLC
internal containment have the CPU of the CPU, and
take to have an I/ O for expand
of
exterior to
connect
a
people's address
and saving machine
three big pieces to
constitute,
CPU core is from an or many is tired to
add the machine to constitute, mathematics that
they
have the logic operation ability,
and can read the procedure save the contents of
the machine
to drive the homologous
saving machine and I/ Os to connect after pass the
calculation; The I/
O add inner part is
tired the input and output system of the machine
and exterior link, and
deposit the
related data into the procedure saving machine or
data saving machine; The saving
machine
can deposit the data that the I/ O input in the
saving machine, and in work adjusting
to
become
tired
to
add
the
machine
and
I/
O
to
connect,
saving
machine
separately
saving
machine RAM of the procedure saving
machine ROM and dates, the ROM can do deposit of
the
data
permanence
in
the
saving
machine,
but
RAM
only
for
the
CPU
computes
the
temporary calculation usage of hour of
buffer space.
1
The PLC anti- interference is very and
excellent, our root need not concern its service
life and the work situation bad, these
all problems have already no longer become the
topic
that we fail, but stay to our is
a concern to come to internal resources of make
use of the PLC
to strengthen the
control ability of the equipments for us, make our
equipments more gentle.
PLC language is
not we imagine of edit collected materials the
language or language of
Cs to carry on
weaving the distance, but the trapezoid diagram
that the adoption is original
after the
electric appliances to control, make the
electrical engineering teacher while weaving
to write the procedure very easy
comprehended the PLC language, and a lot of non-
electricity
professional also very
quickly know and go deep into to the PLC.
Given its advantages, at present, the
relay control the lift has been gradually replaced
by
PLC control. At the same time, AC
variable frequency motor speed control technology,
the
way
the
lift
drag
speed
has
been
a
gradual
transition
form
DC
to
AC
frequency
converter.
Thus,
PLC
control
technology
increases
VVVF
Elevator
modern
technology
has
become
a
hot industry.
1. PLC
elevator control advantages:
(1) Used
in
elevator control PLC, with so ware
for automatic control of lift operation,
reliability greatly increased.
(2) Layer was removed and majority of
the relay, the control system structure is simple,
simplify the external circuit.
(3)
PLC
can
be
a
variety
of
complex
control
system,
easy
to
add
or
change
control
functions.
(4) PLC can be
automated fault detection and alarm display to
improve the operation of
security and
ease of maintenance.
(5) For the group
control the allocation and management, and improve
the efficiency of
elevator operation.
(6)Do not need to change the control
scheme changes when the hardware connection.
2. VVVF elevator control
characteristics.
With
the
power
electronics,
microelectronics
and
computer
technology
to
control
the
rapid
development
of technology, communication technology
VVVF also a very rapid
rate.
AC variable frequency motor speed
control technology is the power to improve the
process in
order to improve product
quality and improving the environment and
promoting technological
2
progress
as
a
primary
means.
Frequency
of
its
excellent
performance
and
the
speed
brake
from a smooth
performance, high efficiency, high power factor
and power-saving of a broad
scope of
application and many other advantages of being at
home and abroad recognized as
the most
promising approach speed.
Exchange
characteristics of VVVF Elevator:
(1)
low energy consumption.
(2) low load
circuit, the re emergency power supply device of
small.
In
the
acceleration
stage,
the
required
start-up
current
of
less
than
2.5
times
the
rated
current. Peak starting
current and time is short. Since the starting
current is drastically reduced,
so
power consumption and power supply cable diameter
can be reduced a lot. Required for
emergency power supply devices are also
relatively small size.
(3) high
reliability and long service life.
(4)
good comfort.
Elevator
operation
is
best
to
follow
the
speed
curve
of
a
given
operation.
Their
characteristics can be adapted to human
feelings, and to ensure that noise operation,
smooth
brake Ping layer and high
precision.
(5) stable noise-free.
(6)
In
the
car,
the
engine
room
and
adjacent
areas
to
ensure
that
noise.
Because
their
systems use a high clock frequency.
Always produce a true sine wave power supply
current
yet. Motor torque ripple does
not appear. Therefore, to eliminate vibration and
noise.
3. Elevator control technology.
The
so-called
elevator
control
technology
refers
to
the
elevator
drive
system
and
electrical control system of automatic
control. 70 as the 20th century in China’s
elevator were
marked
by
the
exchange
of
two-speed
elevator.
Its
speed
is
used
to
change
the
elevator
traction motor of the very few, two or
mute-level approach to the number of windings,
very
few
of
them
as
high-speed
winding
of
the
winding,
a
very
few
number
of
windings
as
the
low-speed winding. Windings for high-
speed elevator-speed start-up and running, low-
speed
windings for braking and the
maintenance of elevators.
The early
80s, VVVF inverter controlled variable lift system
available. It uses AC motor
drivers,
are able to reach the level of DC motor, control
the speed of the current has reached 6
3
m/sec. Its
small size, light weight, high efficiency, energy
saving, inc1uding the past almost
all
the advantages of the lift. Is the latest elevator
drive system
Operation in vertical
lift, there is also the starting point of the
terminus station. For more
than
three-story
elevator
buildings,
the
starting
point
of
the
terminal
stations
and
stops
between
the
had
not,
the
starting
point
for
these
stations
at
the
first
floor
of
the
terminal
located
at
the
highest
floor.
Starting
point
in
the
first
floor
of
the
station
known
as
base
stations, known as the starting point
at both ends of the terminal stations and stations
at both
ends of intermediate stops
between stations.
Outside the station
has a call box, box set are used by staff for
elevator call button or
touch the call
button, the general ends of the lift stations in
the call box on the Settings button
or
touch of a button. 1iddle layer of the station set
up the call box button or touch button 2.
No drivers for the control of
elevators, at various stations are set up calls me
on a button or
touch button. Elevator
car and the internal settings (except for debris
elevator) to manipulate
me. Control box
switch on the handle or set up stations and the
corresponding layer of buttons
or
touch-button control box on the touch-control
button or command button or touch the city
button. Outside the command button or
touch-button issue as the signal outside the
command
signal,
within
the
command
button
or
touch-
button
issue
within
the
signal
as
a
command
signal.
80 In the mid-20th century, the touch button has
been replaced by micro-button.
As the
elevator call box outside the base station, in
addition
to set
up a call button or
touch
button,
but
a1so
set
a
key
switch
in
order
to
work
the
elevator
clearance.
Drivers
or
management staff to open the elevator
to the base station can wriggle through a
dedicated key
to
the
key
switch.
Close
the
elevator
in
place
to
autocratically
cut
off
the
elevator
control
power supply or
power supply.
4. PLC Control Elevator
Design.
With
the
continuous
development
of
urban
construction,
the
increasing
high-rise
buildings,
elevators
and
life
in
the
national
economy
has
a
broad
application.
Elevator
high-rise
buildings
as
a
means
of
transport
in
the
vertical
run
of
daily
life
have
been
inextricably linked
with people. In fact the lift is based on external
call control signals, as well
as
the
laws
of
their
own,
such
as
running,
and
the
cal1
is
random,
the
lift
is
actually
a
man-machine interactive control system,
simple to use control or logic control order can
not
meet
the
control
requirement,
and
therefore,
elevator
control
system
uses
a
random
control
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