Transcript
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Weft InsertionWeft Insertion
MethodMethod
ElectroMagnetic Force
AHA BIN YAHYA - -6 NTU 096 ANA ATIF NASEEM - -6 NTU 048
HOAIB IQBAL - -6 NTU 095
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IntroductionA brief Background
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Projectile MachineO Common projectile is
O 1/4th of shuttle size
O 1/10th
of shuttle massO Due to no weft yarn pirn
O Require very less energy
O Provided by a torsion bar
O Energy stored in itO Released in a sudden
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Projectile MachineO Energy efficient than other
mechanismO But still not very muchO Due to a large number of
mechanical parts involved
O Electromagnetically operated pickingmechanism developed
O Projectile made of permanentmagnetO Loses it properties after some
timeO Attracts iron particles
ONot commercialized
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Projectile & e.m.f.O Projectile can be picked either by
O Stroke methodO
Damages projectileO Produces noise
O Requires more partsO Energy losses
O Non-stroke method
O Less energyO Less noise
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Projectile & e.m.f.O Non-stroke method
O Metallic Conductor ProjectileO
F=LIBO Required DC in projectile during
flightO Permanent contact, not
possible
O Permanent Magnet ProjectileO Attracted / repelled by em field
O Loses its characteristics
O Attracts tiny iron particles
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Projectile & e.m.f.O FerroMagnetic Projectile
O Electromagnetic field promotesthe properties of the material
upto 2000 timesO Attracted towards point with
strongest magnetic field insidesolenoid
O Acts as SHM
: %Note 95 of emf is usually used to produce circular motions while only
% .5 is used to produce linear motion
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Aim of investigationOf the research paper
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O To produce weft insertion device
O Suitable for modern weavingmachines
O Simple in construction
O Low manufacturing cost
O Reliable in working
O Electromagnetic weft insertion
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Assumed targetsO Maximum acceleration of 7k-11km/s-2
O 0.007 seconds acceleration time
O 6-7 cm distance during accelerationO Space required for weft insertion
systemO Determines
O Yarn waste
O Picking speedO 20-25 m/sec final speed
O Depends onO Loom width, rpm and picking
power
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Design & constructionOf electromagnetic weft insertion system
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Electrical PartsO Solenoid
O A coil of dia 1mm and resistance1.3Ω is turned into solenoid of length 150mm and 1020 coils.
O It has inductance of 1.9mH and4.4mH without and withprojectile respectively.
O 2 layers (also 4, 6, 8, 10, 12 and14)
O Optical Sensor
O Switch
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6 0 m m
2 0 m m
5 0 m m
5 0 m m
1 5 0 m m
S ID E
V IE W
T O P
V IE W
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Electrical PartsO Control circuit
O Consists of O
IC of NANDO Driver
O IGBT by Siemens
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Mechanical PartsO Aluminum Rail (during flying)
O Guides projectile
O Keeps it in straight trackO Simple Brake
O Rubber
O Placed inside metallic U-shapedslot
O Stops projectile without vibration ordamage
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Experimental &
Discussion
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Parameters Studied
O Distance of projectile from solenoid
O Capacitor voltageO Coil number of layers
O Projectile length
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Projectile DistanceO The current should turn off quickly as
soon as it reaches its maximum
O Shape of current-time fed is
importantO Projectile from center of shed and
before generation of emf plays animportant role in controlling
current-time fed.
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,
C
u r r
e n
t
A
,Tim e m s
-Turn o ff tim e
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Capacitor Voltage &
Energy Analysis
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Capacitor Voltage &
Energy AnalysisO 30-60 V gives max speedO 60+V decreases speed
O Optimum is 20-30V asO It uses lesser energy as compared
to speed attainedO
:Note The amount of electrical energy%consumed is about 3 of Sulzer Ruti.loom
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Layers in coilO Optimum results were obtained
when two layers were used
O More layers increased the timeconstant and inductance
O The current took more time to turnoff thus inducing negative
accelerationO This keeps projectile in center of
shed
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Projectile LengthO Different projectiles of length 15-
80mm were tested
OA speedometer measured time takenby front and back of projectile to
pass through and with the length of projectile known, the speed wascalculated
O With the help of mass, the KE wasalso calculated
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Summary & Conclusion
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Summary & ConclusionO Maximum current in solenoid
O Material should be
O Sintered powderO High magnetic permeability
O High specific electrical resistance
O Current opening/closing frequency
should be maximumO Time of circuit should be minimum
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Summary & ConclusionO projectile speed depends on coils,
and not on layersO Projectile should be 75-125% of
solenoid lengthO Increase in voltage increases speed
but decreases efficiencyO IR sensors should be used
O High speed, small size, cheap highperformance (not affected byemf)
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