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8/10/2019 Lession 8 [Autosaved].pptx
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www.themegallery.com
Giao tiep va am phan trong kinh doanh quoc te
Lession 8: Special Machines
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Lession 8: Special MachinesoinLessiont
Template
Teacher: H Ch Kin
Group 10Template
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Phan Vn Dng 11082401
V Cng Ngha 11232331
H Vnh Trnh 11235911
Phan Thnh Li 11250941
Group 10
L Anh Qun 11292581
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New words1
Translate2
Exercise3
Video4
Lession 8: Special Machines
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stepper motor : ng c bcinteract : tng tc
shaft : trc quaypulse: xungservo motor: ng c secvo (ng c tr ng)openloop: vng hdrive circuitry: truyn ngversatile: ph bin
Lession 8: Special Machines
I. New words
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Reading passage 1:
Stepper motors
Lession 8: Special Machines
http://www.graphicmail.com/sendlink.asp?HitID=0&SiteID=2370&EmailID=0&Link=http://www.orientalmotor.com/in_motion/stepmotor_diagram_0505.htm8/10/2019 Lession 8 [Autosaved].pptx
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Lession 8: Special Machines
Closely related in design to three-phase AC
synchronous motors are stepper motor, where an
internal rotor containing permanent magnets or a large
iron core with salient poles is controlled by a set of
external magnets that are switched electronically
Loi gn gi trong thit k cho ng c ng b
xoay chiu ba pha l nhng ng c bc, loing c m roto bn trong bao gm nam chmvnh cu hoc li st ln vi c cc li c iukhin bi mt b nam chm bn ngoi, b ny
th c ng ngt kiu in t
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Lession 8: Special Machines
Eng
Viet
ng c bc l mt loi ngc c bit n di chuyn nhngbc ring bit m thngthng l 0.9 mi bc
A stepper motor is a special
kind of motor that moves in
individual steps which areusually .9 degrees each
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Lession 8: Special Machines
Each step is controlled by energizing one or
more of the coils inside the motor which then
interacts with the permanent magnets
attached to the shaft.
Mi bc c iu khin bng cch cp
in cho mt hoc nhiu cun dy bn tronhng c, sau nhng cun dy ny tngtc vi nam chm vnh cu gn lin vi trc
quay
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Lession 8: Special Machines
Turning these coils on and off in
sequence will cause the motor to rotate
forward or reverse.
Vic ng ngt nhng cun dy ny
theo trnh t s lm cho ng c quaytheo chiu thun hay ngc
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Thi gian tr gia mi bc xc nh tc ng c
Lession 8: Special Machines
The time delay between each step determines
the motor's speed
Steppers can be moved to any desired position
reliably by sending them the proper number of step
pulses and stepper motors are rated by the torque
they produce
Cc bc c th c di chuyn n bt k v tr mongmun no mt cch tin cy bng vic truyn cho chngmt s xung bc thch hp v ng c bc th c
nh gi bi momen m chng sinh ra
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Eng
Viet
t c momen nh mc th
nhng cun dy bn trong ng cphi mang dng nh mc trong sutmi bc quay
Lession 8: Special Machines
To achieve full rated torque, the coils
in a stepper motor must reach their
full rated current during each step
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Nhng ng c inng b s dng
nhng vt liu tmm ( c mt li) ckh nng to ramomen ngu lc duy
tr v tr m khngtruyn ng v in
Synchronous electric
motors using soft
magnetic materials(having a core) have
the ability to provide
position holding
torque while notdriven electrically.
Lession 8: Special Machines
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Khng ging nh nhng ng c secvo, nhng
ng c bc c th c s dng vng h mkhng cn ti nhng b m ha c tin kim trav tr ca n
Lession 8: Special Machines
Unlike servo motors, steppers can be used "open-loop"
without the need for expensive encoders to check their
position
Stepper motors are much more cost-effective
than servo systems due to their simplifiedcontrol and drive circuitry
Nhng ng c bc c chi ph thp hn hthng secvo do bi s n gin ha trong iu
khin v truyn ng ca chng
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Lession 8: Special Machines
There are no brushes to replace in a
stepper motor, eliminating the need
for maintenance.
Khng c chi than thay th trong
ng c bc do loi b c nhucu bo tr
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Lession 8: Special Machines
Even though a stepper motor system can notachieve the speed of a servo motor system, their
ease of use allows them to be the preferred
solution for many of today's computerized motion
control systems.
Mc d mt h thng ng c bc khng th t
c tc ca mt h thng secvo, tuy nhinvic s dng chng mt cch d dng cho phpchng tr thnh gii php c a thch chonhng h thng iu khin chuyn ng c
my tnh ha ngy nay.
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Lession 8: Special Machines
The applications: computer controlled steppermotors are one of the most versatile forms of
positioning systems, particularly when part of
a digital servo-controlled system
Nhng ng dng: ng c bc c iu
khin bng my tnh l mt trong nhngdng ph bin nht ca cc h thng iukhin v tr, c bit khi n l mt phn ca
h thng iu khin secvo bng s
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Work in group
?
Structure
of stepper
motor
The
operation
of stepper
motor
How to
control
stepper
motor
Aplication
of stepper
motor
Compared
to servo
motor
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Lession 8: Special Machines
Structure of stepper motor1
Stepper motor has an internal rotor containing permanent magnets
or a large iron core with salient poles is controlled by a set of
external magnets that are switched electronically.
2 The operation of stepper motor
A stepper motor is a special kind of motor that moves in individual
steps which are usually .9 degrees each. Each step is controlled byenergizing one or more of the coils inside the motor which then
interacts with the permanent magnets attached to the shaft. Turning
these coils on and off in sequence will cause the motor to rotate
forward or reverse.
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Lession 8: Special Machines
How to control stepper motor3
Steppers can be moved to any desired position reliably
by sending them the proper number of step pulses
4 Aplication of stepper motor
Computer controlled stepper motors are one of the mostversatile forms of positioning systems, particularly when
part of a digital servo-controlled system
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Lession 8: Special Machines
5 Compared to servo motor
Compared to servo motor,steppers can be used "open-
loop" without the need for expensive encoders to check
their position, more cost-effective than servo systems,
there are no brushes to replace and a stepper motor
system can not achieve the speed of a servo motor
system, but they are easy for use
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Reading passage 2:
Brushless DC motors
Lession 8: Special Machines
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brushless DC motor: ng c mt chiu khng chi thanHall effect: hiu ng Hall
drive electronics : mch truyn ng in tpulse: xungvariable frequency: b bin tnbearings: vng bi
RF noise = radio frequency noise: ting n tn s v tuyn
Lession 8: Special Machines
I. New words
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Midway between ordinary DC motors
and stepper motors lies the realm of
the brushless DC motor
Nm gia ng c mt chiu thng thngv ng c bc l lnh vc ca ng c mt
chiu khng chi than.
Lession 8: Special Machines
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Built in a fashion very similar to stepper motors,these often use a permanent magnet external rotor,
three phases of driving coils, one or more Hall effect
devices to sense the position of the rotor, and the
associated drive electronics
C cu to rt ging vi ng c bc, nhng ng c
ny thng dng 1 roto nam chm vnh cu bao bnngoi, 3 pha ca cun dy truyn ng, 1 hay nhiu thit
b hiu ng Hall nhn bit v tr ca roto v mchtruyn ng in t lin quan
Lession 8: Special Machines
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The coils are activated, one phase after the
other, by the drive electronics as cued by
the signals from the Hall effect sensors.
Nhng cun dy cng c kch hot ln lttrong tng pha mt bi mch truyn ng in tnh c khng ch bi nhng tn hiu t cc
cm bin hiu ng Hall.
Lession 8: Special Machines
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In effect, they act as three-phase synchronous
motors containing their own variable frequency
drive electronics
Thc t, chng c vn hnh nh ng c ng b 3pha c mch truyn ng in t bin tn ring
Lession 8: Special Machines
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Brushless DC motors are commonly used to drive
fans, the spindles within CD, CD-ROM (etc.)
drives, and mechanisms within office products
such as laser printers and photocopiers
Lession 8: Special Machines
Nhng ng c mt chiu khng chi than ththng c s dng truyn ng qut, trcquay bn trong ca nhng a CD, CD-ROM(v.v..), v c cu bn trong ca nhng thit bvn phng nh my in laze v my photocopy.
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Eng
Viet
Chng cng c s dng nhiu
trong nhng my bay m hnhin hiu sut cao
Lession 8: Special Machines
They also find significant use in
high-performance electric model
aircraft
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Lession 8: Special Machines
They have several advantages
over conventional motors:
Chng c mt vi u im hnhn so vi ng c thng thng
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Compared to AC fans using shaded-pole
motors, they are very efficient, running
much cooler than the equivalent AC motors
So vi qut AC dng ng c cc n,chng rt hiu qu, chy mt hn ngc AC tng ng.
Lession 8: Special Machines
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Lession 8: Special Machines
This cool operation leads to much-
improved life of the fan's bearings
iu ny lm tng tui th vng bica qut
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Without a commutator to wear out, the life
of a DC brushless motor can be
significantly longer compared to a DC
motor using brushes and a commutator
Khng c c gp, tui th ca ng c mtchiu khng chi than c th ko di ngk hn so vi ng c mt chiu c chi
than v c gp.
Lession 8: Special Machines
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Commutation also tends to cause a great deal ofelectrical and RF noise; without a commutator or
brushes, a brushless motor may be used in
electrically sensitive devices like audio equipment
or computers
Lession 8: Special Machines
S o chiu cng gy ra nhiu in v cao tng;do khng c c gp v chi than, ng c khngchi than c th c s dng trong cc thit bin nhy cm v in nh thit b audio hoc mytnh.
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The same Hall effect devices that provide thecommutation can also provide a convenient
tachometer signal for closed-loop control (servo-
controlled) applications
Cng nh cc thit b hiu ng Hall to s omch cng c th cung cp 1 tn hiu o tc gc
thun tin cho cc ng dng iu khin vng kn( iukhin secvo)
Lession 8: Special Machines
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The motor can be easily synchronized to
an internal or external clock, leading to
precise speed control
ng c c th d dng ng b hang h bn trong hoc bn ngoi an s iu khin tc chnh xc.
Lession 8: Special Machines
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Lession 8: Special Machines
Modern DC brushless motors
range in power from a fraction of a
watt to many kilowatts
ng c mt chiu khng chi
than hin i c di cng suttng vt t di 1W n vi KW
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Answer the question
?
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Add Your Text
Add Your Text
Add Your Text
Add Your Text
2.What kind of magnet does
The DC brushless motor
Use?3.What are the advantages of DC
Brushless?
4.In which field, the
Applications of DC
Brushless are being
Used?
?
1. Do the structures of the
DC brushless have the same
structure of stepper
motor?Give more details.
Lession 8: Special Machines
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Yes, they do.These often use a permanent
magnet external rotor, three phases of drivingcoils, one or more Hall effect devices to sense
the position of the rotor, and the associated
drive electronics
1
Lession 8: Special Machines
.
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Lession 8: Special Machines
.
The DC brushless motors use a
permanent magnet2
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Lession 8: Special Machines
.
They are very efficient, running much
cooler than the equivalent AC motors, thelife oh them longer, may be used in
electrically sensitive devices, leading to
precise speed control
3
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