A New Rotor Shape Design of 6/2 Switched Reluctance Motor: Comparative Analysis of its Chaotic Behavior with Other Struc
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ORIGINAL ARTICLE
A New Rotor Shape Design of 6/2 Switched Reluctance Motor: Comparative Analysis of its Chaotic Behavior with Other Structures Golam Guidkaya1 · Eric Duckler Kenmoe Fankem1 · Joseph Yves Effa1 Received: 20 May 2020 / Revised: 19 August 2020 / Accepted: 5 October 2020 © The Korean Institute of Electrical Engineers 2020
Abstract The switched reluctance motor (SRM) is of great interest in industrial applications due to its highly appreciated performances and especially for its open loop operating capacity. However, its model is highly nonlinear when taking into account magnetics saturation effects. In this paper, in order to increase the zones of acceleration of the SRM, a new shape of rotor is proposed in order to push the limits of operation towards the high frequencies. The finite element method (FEM) through the FEMM field calculation software was used in order to take into account the geometric structure and saturation phenomena of the magnetic circuit of the machine. Using some tools of chaos, the results obtained have been compared with other SRM structures such as conventional and attack-teeth structures. It appeared that the proposed hollow-teeth structure shows a good dynamic performance in open loop and allows a perfectly periodic dynamic response at high control frequencies. Indeed, the presence of small teeth on the rotor teeth increases the acceleration zones of the machine, which allows it to operate at high frequencies. Graphic abstract
Keywords Chaotic dynamic · Finite element method (FEM) · Hollow-teeth structure · Magnetic saturation effect · Switched reluctance motor (SRM)
* Joseph Yves Effa [email protected] Extended author information available on the last page of the article
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1 Introduction The switched reluctance motor (SRM) has led in recent years to great attention for industrials thanks to some advantages such as: simple structure, robustness, absence of magnets and coils in the rotor, low manufacturing cost, large capacity for open-loop operation, capacity of highspeed operation and variable speed [1, 2]. However, SRM is a highly nonlinear actuator (very pronounced local saturation of the magnetic circuit for certain values of the current, coupling between the equations of the dynamic model), which makes its study very complex [3]. Furthermore, a major drawback of this machine is the strong torque ripple compared to conventional machines; a phenomenon contributing to acoustic noise and mechanical vibration of the rotor [3]. Meanwhile, these torque ripples can be minimized through a good optimization of the structure’s geometry or by a proper control technique [4–6]. Switched reluctance motor are more and more used nowadays in high speed machining processes (HSM). Indeed, the HSM is a technique for obtaining parts by removing chips characterized by specific cutting conditions. This technique consists in significantly increasing the cutting speeds (from 5 to 10 times higher than that of so-called “conventional” machining) and of rotation of the
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