Scribd
Upload
461 views14 pages

LVDT Presentation

The linear variable differential transformer (LVDT) uses a primary winding and two secondary windings arranged concentrically around a movable ferromagnetic core to convert linear motion into an electrical signal. As the core moves, it varies the coupling between itself and the windings, inducing different voltages that are compared to determine displacement amount and direction. LVDTs have high sensitivity, repeatability, infinite resolution, and are simple and lightweight, making them well-suited for measuring small displacements in various applications and as secondary transducers for measuring force, weight, and pressure.

Uploaded by

Vamshi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
461 views14 pages

LVDT Presentation

The linear variable differential transformer (LVDT) uses a primary winding and two secondary windings arranged concentrically around a movable ferromagnetic core to convert linear motion into an electrical signal. As the core moves, it varies the coupling between itself and the windings, inducing different voltages that are compared to determine displacement amount and direction. LVDTs have high sensitivity, repeatability, infinite resolution, and are simple and lightweight, making them well-suited for measuring small displacements in various applications and as secondary transducers for measuring force, weight, and pressure.

Uploaded by

Vamshi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 14

1

11
 Thelinear variable-differential
transformer(LVDT) is the most widely used
inductive transducer to translate linear
motion into electrical signal

12
Linear Variable Differential Transformer (LVDT)
13
A differential transformer consists of a
primary winding and two secondary windings.
The windings are arranged concentrically and
next to each other.
 A ferro-magnetic core(armature) in the shape
of a rod or cylinder is attached to the
transducer sensing shaft.
 The core slides freely within the hollow
portion of the bobbin.

14
 An a.c. excitation is applied across the
primary winding and the movable core varies
the coupling between it and the two
secondary windings.
 As the core moves away from the centre
position, the coupling to one secondary
becomes more and hence its output voltage
increases, while the coupling and the output
voltage of the other secondary decreases.

15
 Any physical displacement of the core causes
the voltage of one secondary winding to
increase while simultaneously, reducing the
voltage in the other secondary winding.
 The difference of the two voltages appears
across the output terminals of the
transducers and gives a measure of the
physical position of the core and hence the
displacement.

16
 When the core is in the neutral or zero
position, voltages induced in the secondary
windings are equal and opposite and the net
output is negligible.
 By comparing the magnitude and phase of
output with input source, the amount and
direction of movement of core and hence
displacement may be determined.

17
 The transducers possess a high sensitivity.
 The transducers have low hysteresis and
hence repeatability is excellent under all
conditions.
 They have infinite resolution.
 They are simple,light in weight and easy to
maintain.

18
 They are sensitive to stray magnetic fields
but shielding is possible.
 They are inherently low in power output.
 Temperature affects the perfomance of
transducer.

19
 The LVDT can be used in all applications
where displacements ranging from fraction
of a mm to a few cm have to be measured.

 Actingas a secondary transducer it can be


used as a device to measure force, weight
and pressure.

20
21

You might also like