Investigation on the Effects of Magnetic Saturation in Six-Phase Induction Machines with and without Cross Saturation of the Main Flux Path

Abstract

The operational characteristics during transients are significantly influenced by magnetic saturation in electrical equipment. For the computation of steady-state rated operation in multiphase induction machines, the assumption of linear magnetic behavior of the iron core in classical machine models may be sufficient. The mathematical models of the considered models differ in terms of the existence or absence of dynamic cross-saturation effects. The approach that is most frequently used to examine the impact of magnetic saturation is based on the state-space variable representation of the mathematical model in dynamic axes (d–q). The purpose of this research is to investigate the effects of magnetic saturation on six-phase induction machines. In this study, a d–q transformation-based model of a six-phase induction machine (SPIM), including the magnetic saturation effect, is developed. The cross-saturation and the common mutual leakage inductance between the two sets of stators’ windings are then developed and analyzed, and the developed models were simulated and results are compared with and without cross-saturation. The main and leakage flux saturation, as well as the mutual coupling between the two windings, are all accounted for in the model, which is based on the vector space decomposition method. A significant increase in currents and voltage results from the highly saturated magnetic paths of the leakage fluxes in six-phase induction machines. In order to investigate the impact of cross-saturation, inductances computed using analytical methods and those without taking cross-saturation into consideration were compared. These outcomes are then transformed into a condensed current depending on parameter functions for transient machine models.

A Novel Combined Regularization for Identifying Random Load Sources on Coal‐Rock Structure

“…As we all know, these are usually sensitive to errors, such as data errors and discretization errors. Tese errors will lead to large deviations in the identifcation results in the inverse problem, thus attempts to solve the equation (1) directly yield solution vectors that are almost hopelessly disturbed with noise using some traditional mathematical methods [30].…”

Modified Induction Machine Equivalent Circuit Including Solid Shaft Eddy Currents

“…As the machine is loaded and the rotor speed slows down, the slip and the rotor current frequency and amplitude increase, which results in more eddy currents circulating in the shaft. These eddy currents generate their magnetic field, which partially repels the main flux from the shaft and even from the inner side of the rotor back iron [20]. Figure 2c,e,g show how the rotor flux path changes due to the fields that eddy current generated when the speed varies from 2910 rev/min to 2700 rev/min, where slip varies between 3% and 10%.…”

“…As the machine is loaded and the rotor speed slows down, the slip and the rotor current frequency and amplitude increase, which results in more eddy currents circulating in the shaft. These eddy currents generate their magnetic field, which partially repels the main flux from the shaft and even from the inner side of the rotor back iron [20].…”

Efficiency of a Six-Phase Induction Generator Employing a Static Excitation Controller to Generate AC Power for Wind Energy

“…The most economical way to utilize these energy sources for a reliable and high-quality power supply is the current focus of research on the use of wind and small-scale hydropower for the production of electricity. Because of their capacity to create effective power at various speeds, induction generators are commonly utilized in wind turbines and some micro hydro systems, [4][5]. The connection of capacitor banks to the stator terminals, the rotor speed and the presence of the residual magnetic flux in the rotor iron are the necessary conditions for the selfstarting of a generator [6][7], because the latter does not generate its own excitation energy.…”