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LVDT (Linear Variable Differential Transformer)

 

LVDT (Linear Variable Differential Transformer)

LVDT (Linear Variable Differential Transformer)

Definition

LVDT is an electromechanical device used to measure linear displacement and convert it into an electrical signal.

Construction

  • One primary coil
  • Two secondary coils (symmetrically placed)
  • Movable soft iron core

Working Principle

AC voltage is applied to the primary coil, which induces voltages in the secondary coils. The output depends on the position of the core.

Output voltage ∝ displacement

Operation

  • At center (null position): Output = 0
  • Core moves one side: Positive voltage
  • Core moves other side: Negative voltage

Advantages

  • High accuracy
  • No physical contact (less wear)
  • High sensitivity
  • Infinite resolution

Applications

  • Displacement measurement
  • Industrial control systems
  • Robotics
  • Position sensing

LVDT converts linear displacement into an electrical signal.

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