Design of a brushless excitation system utilizing pot cores

2015 ◽  
Vol 34 (6) ◽  
pp. 1740-1757
Author(s):  
Julian Veitengruber ◽  
Frank Rinderknecht ◽  
Horst E. Friedrich
Keyword(s):  
Design Methodology ◽  
Measured Data ◽  
Prototype System ◽  
Transfer System ◽  
Excitation System ◽  
Inductive Power Transfer ◽  
Content Type ◽  
Slip Rings ◽  
Brushless Excitation ◽  
System Compensation

Purpose – The purpose of this paper is to devote the optimal substitution of slip rings through an inductive power transfer system for field winding supply of generators or motors with a wound rotor. By a rotational pot-core transformer approach, the rotor-side energizing of the excitation windings can be provided isolated and free of wear. Design/methodology/approach – For design purpose, an analytical model of the inductive link and the compensation network elements is shown. Based on a pot-core transformer approach, possible types of compensation networks regarding motor-specific constraints were carried out and compared among themselves by parameter studies. The analytical parts of the model were subsequently validated with measured data of an appropriate core and accompanying FEM calculations. On the basis of an experimental prototype system, the approach has been tested both stationary and transient. Findings – The publication exemplifies how a brushless excitation system for generators and motors can be inexpensively designed and implemented. Originality/value – This paper systematically presents a comprehensive analytical approach for brushless excitation systems as well as a prototypical system. Compensation network elements regarding motor-specific constraints were carried out and compared among themselves by parameter studies.

scholarly journals A Graphical Design Methodology Based on Ideal Gyrator and Transformer for Compensation Topology with Load-Independent Output in Inductive Power Transfer System

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 575
Author(s):  
Qian Su ◽  
Xin Liu ◽  
Yan Li ◽  
Xiaosong Wang ◽  
Zhiqiang Wang ◽  
...  
Keyword(s):  
Phase Angle ◽  
Design Methodology ◽  
Constant Current ◽  
Current Gain ◽  
Transfer System ◽  
Power Transfer ◽  
Current Output ◽  
Inductive Power Transfer ◽  
Zero Phase ◽  
Inductive Power

Compensation is crucial in the inductive power transfer system to achieve load-independent constant voltage or constant current output, near-zero reactive power, higher design freedom, and zero-voltage switching of the driver circuit. This article proposes a simple, comprehensive, and innovative graphic design methodology for compensation topology to realize load-independent output at zero-phase-angle frequencies. Four types of graphical models of the loosely coupled transformer that utilize the ideal transformer and gyrator are presented. The combination of four types of models with the source-side/load-side conversion model can realize the load-independent output from the source to load. Instead of previous design methods of solving the equations derived from the circuits, the load-independent frequency, zero-phase angle (ZPA) conditions, and source-to-load voltage/current gain of the compensation topology can be intuitively obtained using the circuit model given in this paper. In addition, not limited to only research of the existing compensation topology, based on the design methodology in this paper, 12 novel compensation topologies that are free from the constraints of transformer parameters and independent of load variations are stated and verified by simulations. In addition, a novel prototype of primary-series inductor–capacitance–capacitance (S/LCC) topology is constructed to demonstrate the proposed design approach. The simulation and experimental results are consistent with the theory, indicating the correctness of the design method.

Influence of the cavities on the PCB mechanical properties

Circuit World ◽  
2015 ◽  
Vol 41 (2) ◽  
pp. 76-79
Author(s):  
Boleslav Psota ◽  
Alexandr Otáhal ◽  
Ivan Szendiuch
Keyword(s):  
Mechanical Properties ◽  
Resonant Frequency ◽  
Design Methodology ◽  
Printed Circuit Boards ◽  
Measured Data ◽  
Circuit Boards ◽  
Frequency Range ◽  
Content Type ◽  
Printed Circuit ◽  
Acceleration Amplitude

Purpose – The main aim of this paper is to investigate the influence of the cavity coverage on the printed circuit boards (PCB) to the resonant frequency, acceleration and displacement. Design/methodology/approach – Tests were realized on four PCBs with different cavity areas. Frequency range of tests was between 10 and 2,000 Hz with 0.3 g acceleration amplitude. In addition, more simulations were performed to check different setups of the boards. Findings – From the calculated and measured data, it is clear that with the larger cavity area the resonance frequency drops. In case a greater number of components placed in cavities are needed on board, it is appropriate to use multiple smaller cavities than the bigger ones. Originality/value – Results in this paper could be very useful for PCB manufacturers and designers during designing of the new PCBs with cavities for dipped components.

MTAPIN: multi-touch key input enhances security of PIN authentication while keeping usability

2014 ◽  
Vol 10 (3) ◽  
pp. 276-290 ◽  
Author(s):  
Tetsuji Takada ◽  
Yuki Kokubun
Keyword(s):  
Design Methodology ◽  
Evaluation Study ◽  
Personal Identification ◽  
Prototype System ◽  
Security Level ◽  
User Evaluation ◽  
Web Based ◽  
Content Type ◽  
Input Time ◽  
Conventional Scheme

Purpose – The aim of the research is to realize a better form of personal identification number (PIN) authentication for a mobile phone without lowering usability and acceptability. Design/methodology/approach – The authors’ approach is to extend the input operation of PIN authentication by allowing more than one number at a time using a multi-touch-enabled screen. The authors also introduced substitution keys to be able to type any combination of a PIN value and an input pattern by multi-touch typing. Findings – The authors conducted a user evaluation study using a Web-based prototype system. The results of the study indicate that PIN input time, input errors and secret memorability of the proposed scheme were no worse than those of conventional PIN authentication. The theoretical security level of the proposed scheme is almost three and a half times than that of the conventional scheme. Originality/value – The paper introduced a multi-touch-allowed secret input operation into a PIN authentication. Though the introduction affected not only an input operation but also a PIN input interface and secret information, it makes possible to realize a better security level without a drastic change of a user interface and taking a longer input time.

Combined heat treatment of metal materials

2016 ◽  
Vol 35 (4) ◽  
pp. 1450-1459 ◽  
Author(s):  
Václav Kotlan ◽  
Roman Hamar ◽  
David Pánek ◽  
Ivo Doležel
Keyword(s):  
Heat Treatment ◽  
Numerical Solution ◽  
Design Methodology ◽  
Measured Data ◽  
Temperature Gradients ◽  
Comsol Multiphysics ◽  
Content Type ◽  
Coupled Problem ◽  
Field Temperature ◽  
Metal Materials

Purpose – The purpose of this paper is to propose and analyze a combined heat treatment of metal materials, consisting in classic induction pre-heating and/or post-heating and full heating by laser beam. This technology is prospective for some kinds of surface hardening and welding because its application leads to lowering of temperature gradients at the heated spots, which substantially reduces local residual mechanical strains and stresses. Design/methodology/approach – The task was solved like the 3D hard-coupled problem for electromagnetic field, temperature field and field of displacements. It was solved numerically using the techniques based on the FEM. For solution was used commercial software COMSOL Multiphysics, some parts were solved using own scripts in the software Agros. Findings – In the paper are shown results of the numerical solution and experimental measured data. Due the work the authors found that the influence of the pre-heating and post-heating really leads to limit the temperature gradients and from other measurements is clear that also to improving of the welding. Originality/value – The paper presents fully 3D nonlinear and nonstationary mathematical model of hybrid laser welding, its numerical solution experimental verification.

Part library-based information retrieval and inspection framework to support part maintenance using 3D printing technology

2019 ◽  
Vol 25 (3) ◽  
pp. 630-644 ◽  
Author(s):  
Hyungki Kim ◽  
Moohyun Cha ◽  
Byung Chul Kim ◽  
Taeyun Kim ◽  
Duhwan Mun
Keyword(s):  
Information Retrieval ◽  
3D Printing ◽  
Design Methodology ◽  
User Needs ◽  
Prototype System ◽  
3D Printer ◽  
Printing Technology ◽  
Content Type ◽  
Know How ◽  
3D Printing Technology

Purpose The purpose of this study is the use of 3D printing technology to perform maintenance on damaged parts on site. To maintain damaged parts, the user needs experience in the parts design and 3D printing technology. To help users who have little or no experience on 3D printing, a part library-based information retrieval and inspection framework was proposed to support the process of manufacturing replaceable parts using a 3D printer. Design/methodology/approach To establish the framework, 3D printing-based maintenance procedure was first defined, comprising retrieval, manufacturing and inspection steps, while identifying the technical components required to perform the procedure. Once the technical components are identified, part library-based information retrieval and inspection framework was defined based on the technical components and the relationships between the components. For validation of the concept of the framework, prototype system is developed according to the proposed framework. Findings The feasibility of the proposed framework is proved through maintenance experiments on gaskets and O-rings. Originality/value The main contribution of this study is the proposal of the framework, which aims to support the maintenance of damaged parts for the user who has little or no experience in part design or does not know how to operate a 3D printer.

About the change of flow factors during the run-in process of lubricated contacts

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Achill Holzer ◽  
Katharina Schmitz
Keyword(s):  
Shear Flow ◽  
Surface Structure ◽  
Design Methodology ◽  
Test Bench ◽  
Flat Surface ◽  
Measured Data ◽  
Content Type ◽  
Lubricated Contacts ◽  
Digital Microscope ◽  
Experimental Test Bench

Purpose This paper aims to increase the knowledge of the run-in process of lubricated contacts in hydraulical pumps. When performing EHL simulations of tribological contacts, the surface influence needs to be taken into account. This experimental measurement wants to investigate the amount of change of the flow factors in the first hour of run of tribological contacts. Design/methodology/approach An experimental test bench is used to run-in several samples. After several minutes of running, samples are removed and the surface structure is captured using a digital microscope. With the measured data, flow factors are calculated. Findings The findings were clear that flow factors are highly direction-dependent, especially shear flow factors in radial directions experience almost no change. Overall, influence of the surface structure of up to 30% compared to a flat surface can be registered. Originality/value This paper helps to choose application-oriented values for the simulation of tribological contacts.

scholarly journals Italy: money transfer, money laundering and intermediary liability

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Livio Corselli
Keyword(s):  
Design Methodology ◽  
Original Study ◽  
Transfer System ◽  
Criminal Cases ◽  
Content Type ◽  
Migrant Communities ◽  
Money Transfer ◽  
Money Transfers ◽  
Intermediary Liability ◽  
Legal Frameworks

Purpose This paper aims to offer a general overview of money transfers in Italy and Europe focussing specifically on the migrant community. This is of particular interest because it is in that community where money transfers are most prevalent. This shows the money transfer system as a tool that could guarantee the financial inclusion of migrants but at the same time being used in a distorted and unlawful manner. Design/methodology/approach After a brief introduction focussed on working principles and legal frameworks, the paper will go deeper in evaluating money transfer data. This data, which comes from various legal authorities, will show the extent to which different migrant communities who reside in Italy are able to carry out illicit activity using money transfers. It will also highlight the existence of legislative inconsistencies through a case by case approach. Findings This paper shows the reason why people find it relatively easy to use money transfers to launder money or in a broader sense, take part in other illicit financial operations such as financing terrorism. Originality/value This study will examine recent Italian criminal cases concerning the unlawful use of money transfers. This paper is the original study of the author and has not been submitted elsewhere for publication.

scholarly journals A study on MCIN model in intelligent clothing industry

2017 ◽  
Vol 1 (2) ◽  
pp. 133-145 ◽  
Author(s):  
Yixuan Nan ◽  
Yi Liu ◽  
Jianping Shen ◽  
Yueting Chai
Keyword(s):  
Design Methodology ◽  
Clothing Industry ◽  
Information Network ◽  
Prototype System ◽  
Content Type ◽  
New Models ◽  
Intelligent Clothing

Purpose This paper aims to study the material conscious information network (MCIN) to present new models of clothing products and persons and propose new crowd-designing patterns to reconstruct an improved supply–demand relationship in clothing industry. Design/methodology/approach This paper aims to study the MCIN to present new models of clothing products and persons and propose new crowd-designing patterns to reconstruct an improved supply–demand relationship in clothing industry. Findings At last, this paper implements a prototype system of novel e-commerce platform based on the CDCI to illustrate the effectiveness and soundness of the CDCI modeling. Originality/value Different from most related works just focusing on the physiology dimension in the matching of customer and clothing, this paper proposes that the dimension of physiology, character, knowledge and experience should be synthetically considered.

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