## Linear Variable Displacement Transducer (LVDT)

**Principle of LVDT:**

**Construction of LVDT:**

**Working of LVDT:**

Let’s study the working of LVDT by splitting the cases into 3 based on the iron core position inside the insulated former.

**Case 1:**

On applying an external force which is the displacement, if the core reminds in the null position itself without providing any movement then the voltage induced in both the secondary windings are equal which results in net output is equal to zero

i.e., Esec1-Esec2=0

**Case 2:**

When an external force is appilied and if the steel iron core tends to move in the left hand side direction then the emf voltage induced in the secondary coil is greater when compared to the emf induced in the secondary coil 2. Therefore the net output will be Esec1-Esec2

**Case 3:**

When an external force is applied and if the steel iron core moves in the right hand side direction then the emf induced in the secondary coil 2 is greater when compared to the emf voltage induced in the secondary coil 1. therefore the net output voltage will be Esec2-Esec1

**Advantages of LVDT:**

- Infinite resolution is present in LVDT
- High output
- LVDT gives High sensitivity
- Very good linearityRuggedness
- LVDT Provides Less friction
- Low hysteresis
- LVDT gives Low power consumption.

**Disadvantages of LVDT:**

- Very high displacement is required for generating high voltages.
- Shielding is required since it is sensitive to magnetic field.
- The performance of the transducer gets affected by vibrations
- Its is greatly affected by temperature changes.

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