Inductances of electrical machine winding with a nonuniform air-gap

Influence of magnetic saturation effects on the fault detection of induction motors

“…The mutual inductance (10) exists when the following condition is satisfied for the assumed harmonic orders , (11) This equation assures the harmonic balance inside the mathematical model and must be satisfied for sets of harmonic orders. Therefore, the assumption for the set contents influences the accuracy of the mathematical model.…”

“…A similar approach was presented in [2], however it was presented for an eccentrically positioned rotor. This is simplification, however enabling self-and mutual inductances of the machine circuit that can be calculated using the formulae presented in [11] for electrical machines with a non-uniform air-gap. Thus, the machine voltage equations take the commonly known form where R, L, M are the matrices of resistances, leakage inductances and self-and mutual inductances, respectively.…”

Main inductances of induction motor for diagnostically specialized mathematical models

“…The way of inductance determination for converters with two windings placed in nonuniform air-gap, assuming the occurrence of only radial field component, was presented in detail in paper [1]. This paper, however, did not concern the case when the function of air-gap permeance depends on three variables, therefore authors suggest a certain modification, thanks to which the function of inductance can be introduced.…”

“…In circuit models the winding distributions and the rotor air-gap geometry are usually represented by the inductances of the motor windings [1,2]. Then, a determination of inductances is the first and necessary step of modeling [3][4][5][6][7][8][9][10].…”

“…In this paper a simple but very effective method of solving this problem, based on the so called concept of "sinusoidal" windings [1] was used.…”