Aei-405
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DEPARTMENT OF TECHNICAL EDUCATION ANDHRA PRADESH Name
: M. Vani
Designation
: Lecturer
Branch
: AEI
Institution
: Dr. B. R. Ambedkar GMRP,KNR
Year/sem
: IV-SEM
Subject
: Process Instrumentation-II
Subject code
: AEI-405
Topic
: Miscellaneous measurement
Sub topic
: Torque transducer
Duration
: 50 minutes
Teaching aids
: PPT, Visuals AEI405.90
1
Recap In the previous class we have learnt about : Audio sensor (or) detector. Types of audio sensor.
AEI405.90
2
Objectives Upon completion of this topic you will be able to know about Torque transducer Types of torque transducers
AEI405.90
3
Definition Torque is defined as that force which tends to produce rotation. It is the moment due to tangential force T=LW
Where, T=torque L=length of the force arm W=force AEI405.90
4
Definition… Transducer is a device which converts a non-electrical quantity into electrical. Torque is a rotational force. Torque transducers measure the torsional force applied between the two sides of a moving body.
AEI405.90
5
It is characterized by A high torsional stiffness Large capacity High resistance to bending moments Minimal friction error and low error sensitivity due to the absence of moving parts.
AEI405.90
6
Types of torque transducers
Rotating torque sensors Stationary sensors
AEI405.90
7
Rotating torque transducers Measurement is bidirectional It consists of metal shaft with bounded strain gauge It is connected in the Wheatstone bridge as shown in Fig.1. Stress acting on rotating shaft is subjected to torsion.
AEI405.90
8
Diagram of Strain gauge type torque transducer
Fig.1 AEI405.90
9
Torque meters During torsion of a cylinder, strain (tensile or compressive) exists at 450 C to the axis This can be measured by bonded strain gauges The output can be increased by using 4 gauges, so that, adjacent arms have strains of opposite nature
AEI405.90
10
Torque meters The device is useful for both static and dynamic torque measurements Torques over a range of 100 to 100,000 N-cm can be measured with this device
AEI405.90
11
Stationary torque transducer There is change in permeability of the material subjected to tensile or compressive stress. Permeability increases under tensile and decreases under compressive stress. The sensor consists of two primary and two secondary windings mounted near the rotating shaft
AEI405.90
12
Torque transducer 1
AEI405.90
13
Torque transducer 2 (rotating torque sensor)
AEI405.90
14
Uses of transducer It ensures efficiency Safety for measurements in motor and transmission test benches and for monitoring of pumps.
AEI405.90
15
Summary In this class we have discussed about Torque transducer
AEI405.90
16
Quiz 1.
Torque is the ______ force. a) Linear b) Rotational c) Both a and b d) None
AEI405.90
17
Frequently asked questions 1.
Define torque.
2.
What is meant by torque transducer.
AEI405.90
18
: M. Vani
Designation
: Lecturer
Branch
: AEI
Institution
: Dr. B. R. Ambedkar GMRP,KNR
Year/sem
: IV-SEM
Subject
: Process Instrumentation-II
Subject code
: AEI-405
Topic
: Miscellaneous measurement
Sub topic
: Torque transducer
Duration
: 50 minutes
Teaching aids
: PPT, Visuals AEI405.90
1
Recap In the previous class we have learnt about : Audio sensor (or) detector. Types of audio sensor.
AEI405.90
2
Objectives Upon completion of this topic you will be able to know about Torque transducer Types of torque transducers
AEI405.90
3
Definition Torque is defined as that force which tends to produce rotation. It is the moment due to tangential force T=LW
Where, T=torque L=length of the force arm W=force AEI405.90
4
Definition… Transducer is a device which converts a non-electrical quantity into electrical. Torque is a rotational force. Torque transducers measure the torsional force applied between the two sides of a moving body.
AEI405.90
5
It is characterized by A high torsional stiffness Large capacity High resistance to bending moments Minimal friction error and low error sensitivity due to the absence of moving parts.
AEI405.90
6
Types of torque transducers
Rotating torque sensors Stationary sensors
AEI405.90
7
Rotating torque transducers Measurement is bidirectional It consists of metal shaft with bounded strain gauge It is connected in the Wheatstone bridge as shown in Fig.1. Stress acting on rotating shaft is subjected to torsion.
AEI405.90
8
Diagram of Strain gauge type torque transducer
Fig.1 AEI405.90
9
Torque meters During torsion of a cylinder, strain (tensile or compressive) exists at 450 C to the axis This can be measured by bonded strain gauges The output can be increased by using 4 gauges, so that, adjacent arms have strains of opposite nature
AEI405.90
10
Torque meters The device is useful for both static and dynamic torque measurements Torques over a range of 100 to 100,000 N-cm can be measured with this device
AEI405.90
11
Stationary torque transducer There is change in permeability of the material subjected to tensile or compressive stress. Permeability increases under tensile and decreases under compressive stress. The sensor consists of two primary and two secondary windings mounted near the rotating shaft
AEI405.90
12
Torque transducer 1
AEI405.90
13
Torque transducer 2 (rotating torque sensor)
AEI405.90
14
Uses of transducer It ensures efficiency Safety for measurements in motor and transmission test benches and for monitoring of pumps.
AEI405.90
15
Summary In this class we have discussed about Torque transducer
AEI405.90
16
Quiz 1.
Torque is the ______ force. a) Linear b) Rotational c) Both a and b d) None
AEI405.90
17
Frequently asked questions 1.
Define torque.
2.
What is meant by torque transducer.
AEI405.90
18
