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LVDT (Linear variable differential transformer or transducer) simple working explanation. By Yuvi - Study Point

Hey everyone, today we are going to learn about LVDT (Linear variable differential transformer or transducer).
So, without wasting any time lets get started.



  • LVDT'S are used to measure the displacement. It is similar to RVDT but LVDT employs soft or flexible iron core for displacement measurement and RVDT employs a cam-type core or a rotary ferromagnetic core.
  • LVDT is a common type of electromechanical transducer.
  • Applications of LVDT ~ power generation, aerospace, industrial automation, test, and measurement, subsea, etc.
  • It converts the linear displacement into an electrical signal through the principle of mutual induction.
  • LVDT'S main components are the transformer and the core.
  • It is basically an electromechanical sensor which I have told you which is used to convert mechanical motion or vibrations, more specifically a rectilinear motion into a variable electrical current, electric signals or voltage.
Now, let's see the three cases or conditions which occurs in LVDT.
  • If an external force is applied and the core remains in the null position without any displacement then the voltage induced in both the secondary windings is equal and the net output result is equal to 0. 
E1 - E2 = 0
  • And if an external force is applied and the core moves in the left side then the e.m.f induced in the secondary coil 1 is greater than the e.m.f induced in secondary coil 2.
E1 - E2 = (+) POSITIVE
  • And due to external force if the core moves in the right-hand side then the e.m.f induced in the secondary coil 2 is greater than the secondary coil 1. 
 E1 - E2 = (-)NEGATIVE

{Please go and check out my channel and this video. Because in this video I have explained the LVDT (Linear variable differential transformer) in simple or easiest way possible. }
{ And please go and check out the lecture video of mine which illustrates the difference between active and passive transducers and their explanations.}



Thank you!




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