Degree of fault tolerance of the multi-phase traction electric motors: Methodology and application

2016 ◽  
Author(s):  
Igor Bolvashenkov ◽  
Hans-Georg Herzog
Keyword(s):  
Fault Tolerance ◽  
Electric Motors ◽  
Multi Phase

Reliability and Fault Tolerance Modeling of Multiphase Traction Electric Motors

2018 ◽  
pp. 267-296
Author(s):  
Ilia Frenkel ◽  
Lev Khvatskin ◽  
Ehud Ikar ◽  
Igor Bolvashenkov ◽  
Hans-Georg Herzog ◽  
...  
Keyword(s):  
Fault Tolerance ◽  
Electric Motors ◽  
Tolerance Modeling

scholarly journals Degree of Fault Tolerance as a Comprehensive Parameter for Reliability Evaluation of Fault Tolerant Electric Traction Drives

2016 ◽  
Vol 1 (3) ◽  
Author(s):  
Igor Bolvashenkov ◽  
Hans-Georg Herzog
Keyword(s):  
Fault Tolerance ◽  
Fault Tolerant ◽  
Practical Application ◽  
New Approach ◽  
Power Train ◽  
Power Drive ◽  
Traction Drives ◽  
Electric Traction ◽  
Multi Phase ◽  
Traction Electric Motor

This paper describes a new approach and methodology of quantitative assessment of the fault tolerance of electric power drive consisting of the multi-phase traction electric motor and multilevel electric inverter. It is suggested to consider such traction drive as a system with several degraded states. As a comprehensive parameter for evaluating of the fault tolerance, it is proposed to use the criterion of degree of the fault tolerance. For the approbation of the proposed method, the authors carried out research and obtained results of its practical application for evaluating the fault tolerance of the power train of an electrical helicopter.

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.

Some Applications of the U. S. Steel MVEM

1973 ◽  
Vol 31 ◽  
pp. 4-5
Author(s):  
J. S. Lally ◽  
L. E. Thomas ◽  
R. M. Fisher
Keyword(s):  
Electron Diffraction ◽  
Debye Temperature ◽  
Metals And Alloys ◽  
Critical Voltage ◽  
Dynamical Diffraction ◽  
Phase Structures ◽  
Structure Factors ◽  
Local Bonding ◽  
Diffraction Phenomenon ◽  
Multi Phase

A variety of materials containing many different microstructures have been examined with the USS MVEM. Three topics have been selected to illustrate some of the more recent studies of diffraction phenomena and defect, grain and multi-phase structures of metals and minerals.(1) Critical Voltage Effects in Metals and Alloys - This many-beam dynamical diffraction phenomenon, in which some Bragg resonances vanish at certain accelerating voltages, Vc, depends sensitively on the spacing of diffracting planes, Debye temperature θD and structure factors. Vc values can be measured to ± 0.5% in the HVEM ana used to obtain improved extinction distances and θD values appropriate to electron diffraction, as well as to probe local bonding effects and composition variations in alloys.

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