When an AC excitation signal is applied to the Primary Coil

(P), voltages are induced in the two Secondary Coils (S).

The MAGNETIC CORE inside the COIL WINDING ASSEMBLY provides

the magnetic flux path linking the Primary and secondary

Coils.Since the two voltages are of opposite polarity, the

Secondary Coils are connected series opposing in the

center, or Null Position. The output voltages are equal

and opposite in polarity and, therefore, the output voltage

is zero. The Null Position of an LVDT is extremely stable

and repeatable.

When the MAGNETIC CORE is displaced rom the Null

Position, an electromagnetic imbalance occurs. This

imbalance generates a differential AC output voltage

across the Secondary Coils which is linearly proportional

to the direction and magnitude of the displacement.

As shown in the figure, when the MAGNETIC CORE is moved

from the Null

Position, the induced voltage in the Secondary Coil, toward

which the Core is

moved, increases while the induced voltage in the opposite

Secondary Coil

decreases.

LVDTs possess the inherent ruggedness and durability of a

transformer and

truly provide infinite resolution in all types of

environments. As a result of the

superior reliability and accuracy of LVDTs, they are the

ideal choice for linear

motion control.