Cylindrical Magnetic Circuit Regions: Magnetizing Reactance Values

Abstract

The magnetizing reactance values obtained in Chap. 4 correspond to the condition when the magnetic flux in the regions of the magnetic circuit is constant for a given value of the air gap emf. In the stator and rotor regions (with the exception of the stator and rotor joke regions), as well as in the air gap, magnetic flux is determined by the radial component of the magnetic induction, the value of which does not change within a single region. For the stator and rotor joke regions, average magnetic lines are introduced for which the average values of the tangential components of the magnetic inductions do not change. However, in the cross-section of an electric machine, both radial and tangential components of magnetic field strength take place. Therefore, the magnetic flux determined for a given value of the air gap emf changes over the cross-sections of the magnetic circuit regions. In this connection, the magnetizing reactance values generally should be calculated taking into account the changed of magnetic flux in the regions of the magnetic circuit. Let us consider below the features for determining the magnetizing reactance values of the magnetic circuit regions, taking into account these changes.