Analysis of linear induction machines with internal fault by MEC

Purpose The purpose of this paper is to introduce an asymmetric structure of the magnetic equivalent circuit (MEC) for analysis of the linear induction machine (LIM) with an internal short circuit fault. Design/methodology/approach By applying a proper MEC to the LIM, a generalized relation for the inductance matrix of the machine can be directly determined. To evaluate the proposed model, the stator currents and the air-gap flux with the proposed technique are given and compared to the simulation and experimental results in the healthy and fault conditions. Findings The LIM is an axial flux machine with a wide range of applications in high-performance drives. Due to a well-tried effect of the first tooth and the last one (the end effect), the performance level of the LIM decreases. Also, the analysis of the linear machines in fault conditions illustrates more complexity compared to the rotary induction machine. However, the MEC is very simple, describing the behavior of the asymmetric electromechanical devices using the magnetic reluctance or the permeance of flux paths. Originality/value Using the proposed model, there would be some decrease in the complications of the LIM analysis in the asymmetrical conditions. Moreover, analyzing some of the characteristics of the LIM, such as turn-fault condition, it can be calculated with high accuracy.

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Modeling and simulation of saturated double rotor induction machine

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/compel-05-2017-0221 ◽

2018 ◽

Vol 37 (3) ◽

pp. 1139-1165

Author(s):

Koosha Choobdari Omran ◽

Ali Mosallanejad

Keyword(s):

Temperature Effects ◽

Power Efficiency ◽

Reactive Power ◽

Induction Machine ◽

Transient Behavior ◽

State Equations ◽

Content Type ◽

Proposed Model ◽

The Difference ◽

Park Transformation

Purpose Double rotor induction machine (DRIM) is a particular type of induction machine (IM) that has been introduced to improve the parameters of the conventional IM. The purpose of this study is to propose a dynamic model of the DRIM under saturated and unsaturated conditions by using the equations obtained in this paper. Also, skin and temperature effects are considered in this model. Design/methodology/approach First, the DRIM structure and its performance will be briefly reviewed. Then, to realize the DRIM model, the mathematical equations of the electrical and mechanical part of the DRIM will be presented by state equations in the q-d axis by using the Park transformation. In this paper, the magnetizing fluxes saturation is included in the DRIM model by considering the difference between the amplitudes of the unsaturated and saturated magnetizing fluxes. The skin and temperature effects are also considered in this model by correcting the rotor and stator resistances values during operation. Findings To evaluate the effects of the saturation and skin effects on DRIM performance and validate the model, the machine is simulated with/without consideration of saturation and skin effects by the proposed model. Then, the results, including torque, speed, stator and rotor currents, active and reactive power, efficiency, power factor and torque-speed characteristic, are compared. In addition, the performance of the DRIM has been investigated at different speed conditions and load variations. The proposed model is developed in Matlab/Simulink for the sake of validation. Originality/value This paper presents an understandable model of DRIM with and without saturation, which can be used to analyze the steady-state and transient behavior of the motor in different situations.

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Research on End Effect of Linear Induction Machine for High-Speed Industrial Transportation

IEEE Transactions on Plasma Science ◽

10.1109/tps.2010.2085089 ◽

2011 ◽

Vol 39 (1) ◽

pp. 116-120 ◽

Cited By ~ 47

Author(s):

Junyong Lu ◽

Weiming Ma

Keyword(s):

High Speed ◽

Induction Machine ◽

End Effect ◽

Linear Induction ◽

Linear Induction Machine

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Upgraded Limited-Step Predictive Current Control Strategy for Linear Induction Machine based on Linear Metro

2021 13th International Symposium on Linear Drives for Industry Applications (LDIA) ◽

10.1109/ldia49489.2021.9505944 ◽

2021 ◽

Author(s):

Syed Arslan Bukhari ◽

Wei Xu ◽

Mahmoud F. Elmorshedy ◽

Abdul Khalique Junejo ◽

Samir A. Hamad

Keyword(s):

Control Strategy ◽

Induction Machine ◽

Current Control ◽

Linear Induction ◽

Linear Induction Machine

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Fused filament printing of specialized biomedical devices: a state-of-the art review of technological feasibilities with PEEK

Rapid Prototyping Journal ◽

10.1108/rpj-06-2020-0139 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Erfan Rezvani Ghomi ◽

Saeideh Kholghi Eshkalak ◽

Sunpreet Singh ◽

Amutha Chinnappan ◽

Seeram Ramakrishna ◽

...

Keyword(s):

High Performance ◽

State Of The Art ◽

Three Dimensional ◽

Patient Specific ◽

Biomedical Devices ◽

Fused Filament Fabrication ◽

Content Type ◽

Patient Specific Implants ◽

Complex Design ◽

Wide Range

Purpose The potential implications of the three-dimensional printing (3DP) technology are growing enormously in the various health-care sectors, including surgical planning, manufacturing of patient-specific implants and developing anatomical models. Although a wide range of thermoplastic polymers are available as 3DP feedstock, yet obtaining biocompatible and structurally integrated biomedical devices is still challenging owing to various technical issues. Design/methodology/approach Polyether ether ketone (PEEK) is an organic and biocompatible compound material that is recently being used to fabricate complex design geometries and patient-specific implants through 3DP. However, the thermal and rheological features of PEEK make it difficult to process through the 3DP technologies, for instance, fused filament fabrication. The present review paper presents a state-of-the-art literature review of the 3DP of PEEK for potential biomedical applications. In particular, a special emphasis has been given on the existing technical hurdles and possible technological and processing solutions for improving the printability of PEEK. Findings The reviewed literature highlighted that there exist numerous scientific and technical means which can be adopted for improving the quality features of the 3D-printed PEEK-based biomedical structures. The discussed technological innovations will help the 3DP system to enhance the layer adhesion strength, structural stability, as well as enable the printing of high-performance thermoplastics. Originality/value The content of the present manuscript will motivate young scholars and senior scientists to work in exploring high-performance thermoplastics for 3DP applications.

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Optimization of synthetic jet actuation by analytical modeling

Aircraft Engineering and Aerospace Technology ◽

10.1108/aeat-06-2019-0127 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Max Huber ◽

Andreas Zienert ◽

Perez Weigel ◽

Martin Schüller ◽

Hans-Reinhard Berger ◽

...

Keyword(s):

High Performance ◽

Synthetic Jet ◽

Parameter Study ◽

Content Type ◽

One Dimensional ◽

Wide Range ◽

Jet Actuators ◽

Different Dimensions ◽

Oscillation Correction ◽

Good Agreement

Purpose The purpose of this paper is to analyze and optimize synthetic jet actuators (SJAs) by means of a literature-known one-dimensional analytical model. Design/methodology/approach The model was fit to a wide range of experimental data from in-house built SJAs with different dimensions. A comprehensive parameter study was performed to identify coupling between parameters of the model and to find optimal dimensions of SJAs. Findings The coupling of two important parameters, the diaphragm resonance frequency and the cavity volume, can be described by a power law. Optimal orifice length and diameter can be calculated from cavity height in good agreement with literature. A transient oscillation correction is required to get correct simulation outcomes. Originality/value Based on these findings, SJA devices can be optimized for maximum jet velocity and, therefore, high performance.

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