Abstract
Accurate measurement and determination of the electromagnetic characteristics of the switched reluctance motor (SRM) are indispensable to their advanced control and performance analysis. This paper proposes a novel method for modeling the flux-linkage characteristics of SRM. This strategy without rotor locking, includes three steps, namely measuring, estimating and calculating steps. In the first step, flux linkage curves with current at four equilibrium positions are obtained by an indirect measurement method. In the second step, the flux-linkage characteristic of SRM in the middle position is estimated by its two adjacent flux-linkage curves. In the third step, a decoupled analytical model based on the five-order Fourier series is developed to construct the entire flux-linkage characteristics. The proposed method can not only eliminate the requirements on rotor clamping devices or position sensors, but also achieve fast and accurate modeling for the electromagnetic characteristics of SRM. Comparative studies are carried out between the proposed method and the conventional rotor clamping method, and the results demonstrate that the proposed method has a good agreement with the conventional rotor clamping method. Moreover, the simulation model is established in MATLAB/Simulink software based on the entire electromagnetic characteristics calculated by the proposed method. The accuracy of the proposed method is further verified by comparing the simulation and experimental results under different operating modes of the SRM.
Highlights
The switched reluctance motor (SRM) has received great attention in many fields due to its simple and rugged structure with high efficiency, strong reliability and low cost [1,2,3,4]
An accurate method for modeling the electromagnetic characteristics of SRM is proposed in this paper
The flux-current (ψ − i) characteristics of five special positions are obtained by combining the measurement technique of the equilibrium position and the estimation method of flux-linkage in the middle position
Summary
The switched reluctance motor (SRM) has received great attention in many fields due to its simple and rugged structure with high efficiency, strong reliability and low cost [1,2,3,4]. The core of obtaining the electromagnetic characteristics of SRM is to accurately describe the relationship among the flux-linkage ψ, rotor position θ and current i [5,6]. This method uses only five sampling data points of flux-current-position ψ(i, θ ) characteristics. Based on the symmetric structure of the SRM, the flux-linkage samples at some special rotor positions can be quickly measured without rotor clamping devices [21]. There is a little work on the accuracy modeling of SRM only based on the sampling data of these special rotor positions. By combining the variation characteristics of the flux-linkage with the rotor position, the accuracy modeling of SRM is realized only based on four flux-linkage curves obtained through experimental measurements.
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