Torque Trans (1)
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Transcript of Torque Trans (1)
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A Presentationon
Torque Transducers
By1. Vishal Dwivedi2. Sounak
Mojumder
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twisting or turning force about an axis, that canbe applied in a clockwise or counter-clockwisedirection.
Torque is given as :
T= F.D
where, T= torque, F=force,
D =perpendicular distance from
What is
Torque?
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Applications for torque sensors include determining the power of an engine,
motor, turbine, or other rotating
device stress and deflection analysis
Determining the performance
characteristics of machinesMeasurement Analysis:Dynamic measurement of torque transmitted by a
rotating shaft is
based upon the angular displacement or twist in
Why measure Torque?
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Rotating TorqueTransducers
If a shaft is loaded under torsion, it twists to anangle, proportional to the torque. This angle canbe measured with an angle measuring system
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Bonded strain gauge technology
Four strain gauges are bonded
Use of Wheatstone bridge configuration
Temperature compensation components included within the
bridge circuitry.
an excitation voltage is applied to the bridge
an electrical output linearly proportionate to that torque.
Strain Gauge TorqueTransducers
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Strain Gauge Torque TransducersContd
The gauges should be so mounted that they give maximumsensitivity to the strains produced by torsion.
for a shaft subjected to pure torsion, the gaugeswill be strained in the directions of their majoraxis if they are mounted at 450 to the axis of the
shaft.
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Slip Rings are the
conducting rings
attached to the shaft,
but insulated from it.
Each slip ring is
connected to each of
the bridge terminals.
Rubbing contact is
made between the
Strain Gauge Torque TransducersContd
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ADVANTAGES:
1. It is fully temperature compensated.
2. It provides automatic compensationfor bending and axial loads.
3. It gives the maximum sensitivity for agiven torque.
DISADVANTAGE:
Strain Gauge Torque TransducersContd
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Inductive TorqueTransducer
Principle based on Change of Self Inductance:
Self inductance of a coil L= N2 / S,
Where, N = no. of turns ;
S = reluctance of the magneticcircuit.
S = l/ A
Therefore, L = {N2 A / l} = N2 G.
Inductive transducers are mainly used formeasurement of displacement
change ofselfinductance
change ofmutualinductance
productionof eddycurrents
Working
Principle
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Inductive Torque TransducerContd
Flange A carries a coil and
flange B, an iron core.
This core moves in and out
of the coil
Inductance of the coil is
altered on account of
relative displacement.
The coil is used as an arm
of an a.c. bridge. The
output of the a.c. bridge
de ends u on the
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MagnetostrictiveTransducers
The permeability
increases under tensilestress and decreases undercompressive stress.
The wiedemann magnetostriction effect
for the measurement of torquecauses changes in the permeability ofthe materials subjected to tensile orcompressive stresses.
Working Principle:
Two A.C. energizedprimary coils wound on
iron cores, arepositioned close to theshaft so that their fluxpath through the
material of the shaftcoincide with the
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Magnetostrictive TransducersContd
When there is noloading on the shaft,
the permeability ofthe shaft is uniformand equal butopposite voltages are
induced in thesecondary coils S1and S2.
The bridge is initiallybalanced. But whenthe torque is applied
the bridge becomesunbalanced on
account of increase in
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Proximity TorqueTransducers
Construction and Working:
It consist of two identical
toothed-wheels fixed on a
shaft.
Two proximity sensors
(magnetic pickups)
are placed one at each wheel.
When the shaft rotates due to
the applied torque, the tooth of
The rotating shaft torque is determined bymeasuring the angular displacement between the
two sections of a rotating shaft.
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Modern Rotating TorqueTransducers
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Applications:
1. Automotive & Motorsport
2. Aircraft Component Testing & Development
3. Engine Test Stands
4. Marine
5. Production Process Monitoring
6. Pump Development
7. Steel Manufacturing
8. Torque & Power Measurement on Drive
Shafts
9. Tor ue Wrench & Tool Testin Calibration
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