scholarly journals Multi-Phase Fractional-Slot PM Synchronous Machines with Enhanced Open-Circuit Fault-Tolerance: Viable Candidates for Automotive Applications

2021 ◽  
Vol 12 (1) ◽  
pp. 32
Author(s):  
Elyes Haouas ◽  
Imen Abdennadher ◽  
Ahmed Masmoudi
Keyword(s):  
Fault Tolerance ◽  
Open Circuit ◽  
Synchronous Machines ◽  
Analytical Prediction ◽  
Element Analysis ◽  
Multi Phase ◽  
Winding Factor ◽  
Fractional Slot

This paper deals with the winding arrangement of multi-phase fractional-slot permanent magnet (PM) synchronous machines (FSPMSMs), with emphasis on the enhancement of their open-circuit fault-tolerance capability. FSPMSMs are reputed by their attractive intrinsic fault-tolerance capability, which increases with the number of phases. Of particular interest is the open-circuit fault-tolerance capability, which could be significantly enhanced through the parallel connection of the coils or suitable combinations of the coils of each phase. Nevertheless, such an arrangement of the armature winding is applicable to a limited set of slot-pole combinations. The present work proposes a design approach that extends the slot-pole combinations to candidates that are characterized by a star of slots including three phasors per phase and per winding period. It has the merit of improving the tolerance against open-circuit faults along with an increase in the winding factor of multi-phase machines. Special attention is paid to characterization of the coil asymmetry required for the phase parallel arrangement. A case study, aimed at a finite element analysis (FEA)-based investigation of the open-circuit fault-tolerance of a five-phase FSPMSM, is treated in order to validate the analytical prediction.

scholarly journals Redesigning a product: Strategy for alignment to mass production

2020 ◽  
pp. 12-19
Author(s):  
Pedro Agustín Ojeda-Escoto
Keyword(s):  
Mass Production ◽  
Lean Manufacturing ◽  
Geometry Optimization ◽  
New Product ◽  
End User ◽  
Element Analysis ◽  
Complete Procedure ◽  
Design And Manufacture

Today, companies dedicated to the design and manufacture of products seek to improve processes and procedures to provide better services. In addition to this, the development of products designed to meet specific needs plays an important role when feedback is obtained, in terms of design and functionality, from the end user for the consolidation of a product. Looking for such consolidation and identifying improvement opportunities, in the present paper a redesign was made based on specific criteria to align manufacturing to mass production. The theoretical framework is established taking the bases of Concurrent Engineering (CE) and Lean Manufacturing (LM), which allows to base the redesign of a scissor wagon (case study). The proposed design was structured under the approaches of cost reduction, quality improvement and characterization of geometry to reduce weight, allowed to define an architecture capable of being aligned to a mass production. The complete procedure to perform the redesign of the wagon and the analysis criteria used to conform such architecture are reported. Finally, the strategies defined for the inclusion of the new product to production and the geometry optimization results obtained by finite element analysis (FEA) are presented.

Winding Factor of Permanent Magnet Synchronous Machines with Fractional Slot Concentrated Windings

2014 ◽  
Vol 698 ◽  
pp. 73-76 ◽  
Author(s):  
Vyacheslav Korneev ◽  
Alexander Pristup ◽  
Olga E. Gubareva
Keyword(s):  
Permanent Magnet ◽  
Electrical Machines ◽  
Synchronous Machines ◽  
Permanent Magnet Synchronous Machines ◽  
Winding Factor ◽  
Fractional Slot

The use of fractional slot concentrated windings in electrical machines has a variety of advantages. A winding factor is one of the most important parameter which is necessary for electrical machines designing and modeling.

Position varying MEC-based investigation of the no-load operation of T-LPMSMs

2015 ◽  
Vol 34 (6) ◽  
pp. 1687-1702 ◽  
Author(s):  
Mohamed Wael Zouaghi ◽  
Amal Souissi ◽  
Imen Abdennadher ◽  
Ahmed Masmoudi
Keyword(s):  
Design Methodology ◽  
Force Production ◽  
Synchronous Machines ◽  
Wave Energy Conversion ◽  
Permanent Magnet Synchronous Machines ◽  
Element Analysis ◽  
Free Piston ◽  
Content Type ◽  
Practical Implications

Purpose – The purpose of this paper is to deal with the investigation of no-load operation of tubular linear permanent magnet synchronous machines (T-LPMSMs). It is aimed at the prediction of the phase flux linkages, the back-EMF and the cogging force using a position varying magnetic equivalent circuit (MEC). Design/methodology/approach – This study is based on the elaboration and the resolution of the position varying MEC, and the utilization of its results for the prediction of the phase flux linkages, the back-EMF and the cogging force, considering a general topology of T-LPMSMs. Then, a case study is treated with a position varying MEC-based investigation of its no-load features. These are validated by a 2-D finite element analysis (FEA). Findings – It has been found that the developed position varying MEC can be regarded as an accurate tool that requires a low CPU-time. Research limitations/implications – Beyond the FEA validation, this work should be extended to an experimental one. Moreover, the position varying MEC validity should be extended to load operation in order to enable the prediction of the force production capability. Practical implications – The developed position varying MEC could be suitably used for the pre-design of T-LPMSMs. These are currently given an increasing attention in many applications, such as wave energy conversion and free-piston engines. Originality/value – The paper proposes a position varying MEC for the prediction of the features of T-LPMSMs.

Torque production improvement of a five phase fractional-slot PM machine under faulty operation

2015 ◽  
Vol 34 (6) ◽  
pp. 1758-1770
Author(s):  
Hajer Rebai ◽  
Imen Abdennadher ◽  
Ahmed Masmoudi
Keyword(s):  
Open Circuit ◽  
Electromagnetic Torque ◽  
Propulsion Systems ◽  
Element Analysis ◽  
Content Type ◽  
Production Capability ◽  
Production Improvement ◽  
The Mean ◽  
Practical Implications ◽  
Fractional Slot

Purpose – The purpose of this paper is to deal with several approach to recover the torque production capability of a five phase double-layer fractional-slot PM machine under faulty operation. The considered fault is an open-circuit coil in a given phase. Design/methodology/approach – In a first step, the mean futures, such as the phase back-EMFs and the electromagnetic torque, are computed by finite element analysis under healthy operation, and are taken as references. Then, they are investigated, under a faulty coil, for different approaches to recover the torque production capability. Findings – A comparison of the potentialities of the torque recovery approaches has clearly highlight the superiority of the approach consisting in the re-adjustment of the current initial phases, in an attempt to equilibrate the resulting air gap MMF. Research limitations/implications – This work should be extended by an experimental validation of the predicted results regarding the back-EMFs and the electromagnetic torque. Practical implications – The investigation of the considered five phase fractional-slot PM machine under faulty operation should be extended to several faulty scenarios in order to fulfill the requirements of many applications such as the propulsion systems. Originality/value – The paper proposes different approaches to recover the torque production capability of a five phase fractional-slot PM machine under faulty operation.

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

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