Question

What is meant by reference frame theory?

Answer 1

Reference frame, also called frame of reference, in dynamics, system of graduated lines symbolically attached to a body ... the position vector changes in both magnitude and direction, and the velocity of the point

Answer 2

A change of variables is often used to reduce the complexity of the differential equations (voltage equations) that describe the behavior of electric machines. All known real transformations are obtained from the general transformation by simply assigning the speed of the rotation of the reference frame.