In the above equation, [[mu].sub.r] denotes the relative magnetic permeability of a certain component, which is determined as the experimental data as Figure 3, and [A.sub.GMM] denotes the corresponding section area; in GMM, the nonlinearity of its

magnetic reluctance is counted by employing a B(H) curve achieved from practical tests.

With the further increase of working air gap,

magnetic reluctance increases much, and then magnetic saturation disappears.

where [C.sub.L], the pul longitudinal capacitance matrix, gathers the [C.sub.ki] coefficients mentioned in (12), and where the pul

magnetic reluctance matrix [R.sub.m] is determined through

Where [F.sub.s(A,B,C)]- mmf of stator (armature) phase, [F.sub.i]- mmf of [in.sup.th] slot of the secondary element, [R.sub.sh]-

Magnetic reluctance of the shunt parts, [R.sub.[sigma]i]-

Magnetic reluctance of the air gap, [[PHI].sub.[sigma]i]- Magnetic flux in the air gap, and [[PHI].sub.i]- Magnetic flux in the stator core, i=1,2,3,....- slot (tooth) number, or number of the certain part in the equivalent circuit..

If considering the solenoid with the magnetic circuit as being without dispersion, one obtains the equivalent

magnetic reluctance:

The readers of the "magnetic" linear scales generate signals when the reader detects changes in

magnetic reluctance as the machine slide moves.

The principle operation of SRM is grounded on the tendency of an electromagnetic system to obtain a constant equilibrium position minimizing

magnetic reluctance. Whenever diametrically opposite stator poles of a SRM are excited, the closest rotor poles are attracted, resulting in torque production.