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Linear Variable Differential Transformer LVDT

Published on 24/2/2012 & updated on Tuesday 8th of May 2018 at 11:50:52 AM

Definition of LVDT

The term LVDT stands for the Linear Variable Differential Transformer. It is the most widely used inductive transducer that coverts the linear motion into the electrical signal.Linear Variable Differential Transformer LVDT The output across secondary of this transformer is the differential thus it is called so. It is very accurate inductive transducer as compared to other inductive transducers. linear variable differential transformer

Construction of LVDT

Main Features of Construction

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Linear Variable Differential Transformer LVDT

Principle of Operation and Working

As the primary is connected to an AC source so alternating current and voltages are produced in the secondary of the LVDT. The output in secondary S1 is e1 and in the secondary S2 is e2. So the differential output is, This equation explains the principle of Operation of LVDT. linear variable differential transformer Now three cases arise according to the locations of core which explains the working of LVDT are discussed below as, Output VS Core Displacement A linear curve shows that output voltage varies linearly with displacement of core. output versus core displacement Some important points about magnitude and sign of voltage induced in LVDT

Advantages of LVDT

Disadvantages of LVDT

It is concluded that they are advantageous as compared than any other inductive transducer.

Applications of LVDT

  1. We use LVDT in the applications where displacements to be measured are ranging from a fraction of mm to few cms. The LVDT acting as a primary transducer converts the displacement to electrical signal directly.
  2. The LVDT can also act as a secondary transducer. E.g. the Bourbon tube which acts as a primary transducer and it converts pressure into linear displacement and then LVDT coverts this displacement into an electrical signal which after calibration gives the readings of the pressure of fluid.

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