Modelling of switched reluctance machines

Abstract

Analytical models are powerful tools in the preliminary design of electric machines. In this study, a flux‐tube model is proposed for switched reluctance machines, in which all the flux paths and the corresponding elements are accurately calculated, iron saturation is intelligently taken into account and formulas are generally developed to attain a continuous model for any range of design parameters. The inductances, flux linkages, torque–angle, maximum torque–current, mean torque–current characteristics are extracted. The special structure of the developed model enables us to extract the air‐gap flux density distribution of the machine. Also, finite‐element analysis is used in the analyses and evaluation of the model. Finally, the machine has been prototyped by which torque–angle curve and open‐loop characteristics are obtained experimentally to evaluate the model. Superiorities of the proposed framework over the previous approaches are demonstrated as well.

Two‐phase switched reluctance motor with hybrid excitation: Modeling and evaluation

“…Electric machines can be studied using numerical methods like the finite element method (FEM) [4][5][6] or analytic modelling [21][22][23][24][25]. Although accurate, FEM is time-consuming and expensive, while analytic models can compromise accuracy and speed.…”

“…Compared to models based on solutions to Laplace's and Poison's equations [21], magnetic equivalent circuit (MEC) models provide an accurate yet flexible model for SRMs with no geometrically simple boundary conditions. Some works [22] ignored core saturation, while some studies [23][24][25] take it into account. An MEC-based model for SRMs is developed in [26].…”