Modeling of saturated AC machines including air gap flux harmonic components

Main inductances of induction motor for diagnostically specialized mathematical models

“…In standard machines teeth saturated first then cores because there a much higher flux density exist [18]. As a consequence saturation effects appear through a local reduction of magnetic permability of the iron paths and the substitutional air-gap should be modified.…”

“…This modification consists of making the permeance a function of the air-gap flux position and amplitude. This problem of saturation was described in [18], wherein the main concerns of the authors were the prediction of the air-gap length as a function of magnetizing current for case of stator and rotor symmetry. Generally these models are developed from the models with linear magnetic circuits, where saturation is introduced, is based on assumption of a sinusoidally distribution windings and symmetry of air-gap.…”

“…In this paper a new approach to modeling the inductance coefficients for induction motors is developed, where known [18] assumptions are made to transform the linear inductances into the nonlinear one, however, for motor with rotor eccentricities. Three types of eccentricity are distinguished: -static, when the rotor rotation axis coincides with the rotor symmetry axis 0r but does not with the stator symmetry axis 0s, -dynamic, when the rotor rotation axis coincides with the stator symmetry axis 0s but does not with the rotor symmetry axis 0r, -mixed, when the rotor rotation axis does not coincide both with the rotor symmetry axis 0r and with the stator symmetry axis 0s.…”

A Novel Approach to Incorporate the Main Flux Saturation Effect in a Three-phase Induction Machine duringMotoring and Plugging

“…Further, it is observed that highly saturated conditions may affect the static and dynamic performance of induction motor drives [3,4]. For simulation study, different nonlinear models for saturated induction motors have been elaborated based on the equivalent electric circuit approach [5]. An analytical technique [6] has been suggested for predetermination of true saturation characteristic of transformers and reactors from the manufacturer data giving the conventional rms saturation characteristic.…”

Comparison of higher harmonic contents in salient pole synchronous generator with different rotor construction

“…The distribution of the magnetic flux density in the air gap of a salient pole synchronous generator has an influence on the occurrence of higher harmonics in voltage induced in the stator windings [1][2][3][4][5][6][7][8]. The shape of the stator and rotor magnetic surfaces has an influence on the distribution of the magnetic flux density along the air gap circumference, and the magnetic flux density:…”