2. Model design of continuous control of the magnetic read/write head of hard disk.

Dynamic properties of the magnetic head of hard disk as the control object is described by the second order form:

	(2.1)

Where – angle in radians heads when setting the heads on a given track of the disk;   – Amperage of a solenoid (coil) in amperes, disk head rotating mechanism;


In a symbolic form dynamic equation of the head in the form:

	(2.2)

, where   – Integrated operator of Laplace transform;
  – Image functions   and   as a function of .

It follows that the characteristic equation of the disk head has the form:
In standard form the equation we get:

	(2.3)

Thus the roots of the characteristic equation are complex-conjugate:

	(2.4)