dong co 1 pha
TRANSCRIPT
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Alternating Current Machines
B mn inHong Lam Vocational College
Mn hc: My in xoay chiu
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Alternating Current Machines
Squirrel Cage Rotor
Tng t nh ng c 3 pha
Rotor lng sc
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Alternating Current Machines
Stator ng c 1 pha.
Ging nh phn ng c 3
pha
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Alternating Current Machines
Single-phase Motor Stator
Stator ng c 1 pha.
Nu ch c 1 cun dy ni
vo 1 pha s c t trngxoay chiu nh sau..
Khng to ra c t trng quay.
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Alternating Current Machines
Stator ng c 1 pha.
Phn tnh gm hai cun dyt lch nhau 90 .
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Alternating Current Machines
Stator ng c 1 pha.
Khi c hai cun dy t lch nhau
90 s to ra t trng quay gingnhau.
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Alternating Current Machines
Split-phase Motor/ng c chia pha
to ra s lch pha v dng in chng tadng 2 cun dy c cc c tnh v in khc
nhau v ni chng song song vi nhau.
Mt cun (A) c in tr thp vin cm cao.
Cun cn li (B) c in tr cao vin cm thp
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Alternating Current Machines
ng c chia pha
Hai cun dy b tr lch nhau 90 .
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Alternating Current Machines
Hai cun dy b tr lch nhau 90 .
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Alternating Current Machines
ng c chia pha
Tuy nhin, gia hai cun c gc pha = 30
N lm cho t trng quay yuhn v m men khi ng thp.
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Alternating Current Machines
ng c chia pha
Ngay khi ng c chy, tc ca rotor s giatng theo tc ng ca t trng quay.
Lc ny khng cn s dng hai cun dy na.
Cun (B) c th c ngt ra khi ngun nhvo kha ly tm.
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Alternating Current Machines
ng c chia pha
Hai cun dy c gi l cun CHY- ni lin tc vingun, cun Khi ng- c ngt ra khi ng c tkhong 75% tc nh mc.
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Alternating Current Machines
ng c 1 pha
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Alternating Current Machines
Capacitor Start Motor/ T khi ng C
tng m men khi ng ngi ta s dng 1 t in mcni tip vi cun dy khi ng.
Nhm tng gc pha gia cc cun dy gn ti 90 .
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Alternating Current Machines
th khi mc thm t in.
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Alternating Current Machines
Capacitor Start Motor
M ment khi ng khi thm t.
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Alternating Current Machines
T chyT chy c ni vo cun khi ng gim dng khi
khi ng ng c.
Thng dng cho cc ng c khi ng nhiu ln.
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Alternating Current Machines
ng c dng t chy.
Khi chy theo chiu Thun, cun Al cun chnh (chy), cunBl cun ph (khi ng).
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Alternating Current Machines
ng c dng t chy.
Khi chy theo chiu Ngc, cun Bl cun chnh (chy), cunAl cun ph (khi ng).
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Alternating Current Machines
ng c dng t chy.
ng c kiu ny d dng o chiu quay nhng do hai cun dyging nhau nn hiu qu khi ng khng cao, thng dng chocc ng c cng sut nh.
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Alternating Current Machines
Shaded Pole Motor/ ng c c vng lch pha.
S dng cho cc ng dng cn lc xon nh.
Trong li st thng c mt cun dy sn sinh ra t thng.
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Alternating Current Machines
ng c c vng lch pha.
Phn tnh c x rnh t cc vng ngn mch.Trong cun dy(vng ngn mch) c dng cm ng t cun dyng c.
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Alternating Current Machines
ng c c vng lch pha.
The laminated stator has slots in whichSHORT-CIRCUITED copper Shading Rings are placed.
The inductive shading rings have currents induced
that are LAGGING the coil current.
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Alternating Current Machines
Shaded Pole Motor
A small Squirrel Cage Rotor is between the stator poles.
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Alternating Current Machines
Shaded Pole Motor
The small angle of lag between coil flux and shading ring fluxproduces a weak rotating field effect.
The rotor rotates
TOWARDS
the shading rings.
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Alternating Current Machines
Universal Motor
A Universal motor can operate on either DC or AC
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Alternating Current Machines
Universal Motor
A Universalmotor stator
has field poles
and coils
The rotor is alaminated
armature with
commutator,similar to a DC
Series motor
The stator
core is
laminated for
AC operation
Armature coilsare connected
to the
commutator
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Alternating Current Machines
Universal Motor
Current is passed to the armature via carbon brushesin contact with the commutator
Brushes in
Brush-holders
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Alternating Current Machines
Universal Motor
The Armature and Field Coils are in SERIES
Therefore the field coils and armature carry the SAME current
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Alternating Current Machines
Universal Motor
Characteristics of the Universal Motor:
Starting torque is high
No-Load Speed is high
Torque reduces as speed increases
Speed reduces as load increases
This makes the universal motor suitable for vacuum cleaners,
portable power tools (angle grinders, power drills etc)
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Alternating Current Machines
Reversing Rotation of
Single Phase MotorsReversal of rotation of some
single phase motors is fairly simple
Reversal of rotation of some others is not simple
Reversal of rotation of one type is very difficult
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Alternating Current Machines
Reversing Rotation of
Single Phase MotorsSplit Phase Motor
Reverse
RUN
Winding
Reverse
START
Winding
Reverse
START
Winding
and Switch
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Alternating Current Machines
Reversing Rotation of
Single Phase MotorsUniversal Motor Reverse
Armature
Reversal of ARMATURE is simpler
than reversal of TWO field coils.
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Alternating Current Machines
Reversing Rotation of
Single Phase MotorsShaded Pole Motor
Reversal of Shaded Pole Motor requi res
physical reversal of the stator and shading rings.