What is the linear transformer?

Question

What is the linear transformer?

Answer 1

A linear transformer is also called a variable differential transformer.

It usually has 3 toroidal coils, the primary one in the center, flanked by 2 secondary coils to its sides. A ferro-magnetic rod is going through all 3 coils.

It is used to precisely measure movements or displacements (of whatever is attached to the rod) as the output voltage on the secondary coil changes with such movement.

Read more at http://en.wikipedia.org/wiki/Linear_vari... and http://www.sec-america.com/lsfinal.pdf