Abstract
In the single-phase excitation mode of a four-phase 8/6 switched reluctance motor (SRM), the switch angle for each phase is usually high enough to improve the performance of the SRM, which can directly result in overlapping in excitation periods of each adjacent phase. Ignoring the torque variation caused by magnetic coupling between adjacent charged phases during excitation overlap period, which is a general method to establish the model of SRM currently, would greatly influence the accuracy of the simulation model. Aiming at the problem of the general modeling method, a new SRM ontology modeling method is proposed by considering overlapping excitation, based on nonlinear mathematical model established by means of mutual inductance which could influence the electromagnetic characteristics of SRM. Firstly, the reason of interactive excitation and the distribution of the magnetic field are analyzed by (FEM), and the mathematical model is also developed. Then, the detailed static characteristics including mutual inductance and torque are analyzed based on the results of FEM, which are compared with those of the model without considering the effects of interactive excitation. Furthermore, the dynamic simulation model of SRM drive system (SRD) is built, and the simulation results are analyzed and compared with those of the traditional model. Finally, a static experiment is designed and performed to verify the mutual inductance and static torque under long magnetic circuit (LMC) and short magnetic circuit (SMC) in interactive excitation. The comparison results show that the data from experiment are greatly consistent with those from FEM, and the characteristics of mutual inductance and torque under interactive excitation should be considered when establishing the model of SRM.
Highlights
The driving system of switched reluctance motor (SRM) has the advantages of simple structure, low cost, and inherent fault tolerance performance, making it becomes one of the best options for driving system of electric vehicle, renewable energy harvesting, aircraft generators, and other industrial applications [1], [2].The SRM is a doubly salient machine with a rotor without permanent magnets and a stator with independent phaseThe associate editor coordinating the review of this manuscript and approving it for publication was Shihong Ding .windings
Simulation, and experiment are applied to verify the correctness of the proposed modeling method, and the results show the proposed method can improve the accuracy of the SRM dynamic model
Based on the mathematical model expressed by equation (1) to (8), SRM ontology model can be established and illustrated in Fig. 6, which is suitable for both single-phase and two-phase overlap excitation including long magnetic circuit (LMC) and short magnetic circuit (SMC)
Summary
The driving system of switched reluctance motor (SRM) has the advantages of simple structure, low cost, and inherent fault tolerance performance, making it becomes one of the best options for driving system of electric vehicle, renewable energy harvesting, aircraft generators, and other industrial applications [1], [2]. The coupling effects were discussed in [19] and incorporated into the dynamic model, which greatly reduced the harmonic content in the torque ripple This method needed a lot many look-up tables (LUT) calculated by FEM, whose accuracy is impaired if the interval between successive values of current in LUT was large, because computation relied on linear interpolation between two flux-linkage values in a highly nonlinear system like SRM. Their models were simplified as only considering simultaneous excitation, which was no longer applicable if freewheeling currents existed and were not equal to the exciting current These studies have greatly developed the non-linear modeling theory of SRM considering the coupling effects between each exciting phase.
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