Dynamic circuit model considering core losses and phase interaction for switched reluctance machines

Abstract

This study sets forth an equivalent electric circuit (EEC) model including core losses and phase interactions to obtain a more accurate steady and dynamic performance of the high speed switched reluctance motor (SRM) during the design, analysis, and control of the SRM drive system. The magnetic equivalent circuit (MEC) method is used to calculate the flux linkage and torque quickly and relative accurately. Based on the principle of transformation between the MEC and EEC, the EEC model is derived from the MEC model. To enhance the model precision, the dynamic core losses and phase interactions are analysed and added to the EEC model. The relationship between the phase current and virtual current corresponding to different parts is deduced. Then the simulation model of the whole SRM driver systems is established in MATLAB/Simulink to obtain the phase current and virtual current corresponding to a different portion. The experimental and simulated results of the static MEC model and the whole SRM drive system including the EEC model provide the conclusive evidence for validating their practicability.

Design and multi‐objective optimisation of switched reluctance machine with iron loss

“…According to the distribution, the air gap is divided into six regions. Then, the air gap reluctance R g and iron reluctance R rt , R rp , R sy1 , R sy2 , R sy3 , R ry1 , R ry2 can be calculated according to Yan et al [17]. As shown in Fig.…”

“…Similarly, Kirchhoff's voltage law of a mesh in EEC can be transformed from Kirchhoff's current law of a node in MEC. The detailed transformation process and modelling can be obtained according to Yan et al [17].…”

“…According to Yan et al . [17], it can be seen that each iron reluctance in Fig. 3 can be equivalent to the part of the dotted line box in Fig.…”

A detailed magnetic equivalent circuit modeling for torque ripples minimizing of a switched reluctance motor

“…In this modeling, due to ignoring the machine details such as nonlinear saturation phenomena and spatial harmonics, a reliable model is often not obtained. Of course, in some references including Ganji et al and Yan et al, it is attempted to improve this model by adding core losses. However, the presented equivalent circuit is based on the magnetic equivalent circuit (MEC) method, and the equations will have lots of complexity.…”

“…In this modeling, due to ignoring the machine details such as nonlinear saturation phenomena and List of symbols and abbreviations: SRM, switched reluctance motor; MEC, magnetic equivalent circuit; FEM, finite element model; mmf, magnetic motive; R, magnetic core reluctance; B, magnetic flux density; G i,j , air gap permeances; θ, rotor position; φ, magnetic flux; U, magnetic potential; J, total inertia; T em , electromagnetic torque; ω, angular speed spatial harmonics, a reliable model is often not obtained. Of course, in some references including Ganji et al and Yan et al, 8,9 it is attempted to improve this model by adding core losses. However, the presented equivalent circuit is based on the magnetic equivalent circuit (MEC) method, and the equations will have lots of complexity.…”