Draw and describe constructional diagram of RVDT.

Draw and describe constructional diagram of RVDT.
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1 Answer

Answer :

Rotary Variable Differential Transformer (RVDT) is inductive transducer, which converts the angular displacement into electrical signal.

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Construction and working : Figure shows the circuit diagram of RVDT which is similar to that of LVDT except the cam shaped core and it is rotated between the winding with the help of shaft. The operation is similar to the LVDT. If there is no angular displacement to the core i.e. null position, the output voltage of secondary windings S1 and S2 are equal and in opposition. Hence output voltage is zero. If the core rotates in anticlockwise direction it produces more voltage in winding S1 and S2. Hence output is 

Vo = Vs1 – Vs2

If the core rotates in clockwise direction it produces more voltage in winding S2 than S1. Hence output is 

Vo = Vs2 – Vs1

Thus by using RVDT one can determine the angular displacement and its direction

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