What component of a Linear Variable Differential Transformer (LVDT) serves as the primary winding?

The primary winding of a Linear Variable Differential Transformer (LVDT) is located in the center coil. This is a crucial component of the LVDT, as it is responsible for generating an alternating magnetic field when an AC supply is applied. The center coil is surrounded by two secondary coils, which are placed equidistantly on either side. The movement of the armature within the LVDT influences the output voltage from the secondary coils, allowing for precise measurement of linear displacement.

In the context of the question, the primary winding's placement is critical for the operational principle of an LVDT, as it creates the magnetic field that interacts with the secondary coils through the armature's position. This design allows the LVDT to function effectively for various applications requiring non-contact displacement measurements, such as in industrial and aerospace settings. Understanding this configuration is essential for power engineering students as it reflects the principles of electromagnetic induction and sensor technology used in practice.