In a linear variable differential transformer:

Question

Question

This question was previously asked in

ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 1

Answer 1

Linear Variable Differential Transformer:

Linear variable differential transformers (LVDT) are used to measure displacement.
LVDTs operate on the principle of a transformer.
As shown in the figure, an LVDT consists of a coil assembly and a core.
The coil assembly is typically mounted to a stationary form, while the core is secured to the object whose position is being measured.
The coil assembly consists of three coils of wire wound on the hollow form.
A core of permeable material can slide freely through the center of the form.
The inner coil is the primary, which is excited by an AC source as shown.
Magnetic flux produced by the primary is coupled to the two secondary coils, inducing an AC voltage in each coil.