Fast copper loss calculation in coil winding of motor by zooming method

2018 ◽  
Vol 37 (5) ◽  
pp. 1626-1634
Author(s):  
Hirokatsu Katagiri ◽  
Semba Kazuki ◽  
Hiroyuki Sano ◽  
Takashi Yamada
Keyword(s):  
Design Methodology ◽  
Computation Time ◽  
The Finite Element Method ◽  
Content Type ◽  
Speed Increase ◽  
Copper Loss ◽  
Loss Calculation ◽  
Long Time ◽  
Coil Winding ◽  
Practical Implications

Purpose It takes long time for estimating a copper loss in the coil winding of the motor by using the finite element method (FEM). The purpose of this paper is to calculate fast the copper loss by zooming method. Design/methodology/approach The authors adopt the “zooming method” to FEM. The authors compare the accuracy and the calculation time with zooming method and normal FEM. Findings The zooming method contributes to speeding up and the high accuracy of calculation. In the results, the 43-fold speed increase is achieved in the calculation of synchronous motor compared to usual FEM. Practical implications The AC copper loss calculation of 3D motor analysis can be calculated in practical computation time. Originality/value The main advantage of employment of zooming method is significantly reduction of the computation time in the loss calculation of the coil winding.

Frequency dependent resistance calculation of multiple conductors

2017 ◽  
Vol 36 (5) ◽  
pp. 1396-1410
Author(s):  
Tomislav Župan ◽  
Bojan Trkulja
Keyword(s):  
Design Methodology ◽  
Numerical Approach ◽  
Effective Resistance ◽  
Proximity Effects ◽  
The Finite Element Method ◽  
Frequency Range ◽  
Frequency Dependent ◽  
Content Type ◽  
Electromagnetic Devices ◽  
Practical Implications

Purpose The purpose of this paper is to present a method for calculating frequency-dependent resistance when multiple current-carrying conductors are present. Design/methodology/approach Analytical and numerical formulations are presented. Both skin- and proximity-effects are considered in the numerical approach, whereas only skin-effect can be taken into account in analytical equations. The calculation is done using a self-developed integral equation-based field solver. The results are benchmarked using professional software based on the finite element method (FEM). Findings Results from the numerical approach are in agreement with FEM-based software throughout the whole frequency range. Analytical formulations yield unsatisfactory results in higher frequency range. When multiple conductors are mutually relatively close, the proximity-effect has an impact on effective resistance and has to be taken into account. Research limitations/implications The methodology is presented using axially symmetrical conductors. However, the same procedure can be developed for straight conductors as well. Practical implications Presented fast and stable procedure can be used in most electromagnetic devices when frequency-dependent resistance needs to be precisely determined. Originality/value The value of the presented numerical methodology lies in its ability to take both skin- and proximity-effects into account. As conductors are densely packed in most electromagnetic devices, both effects influence the effective resistance. The method can be easily implemented using a self-developed solver and yields satisfactory results.

Explaining the measurement and evaluation stasis

2019 ◽  
Vol 23 (3) ◽  
pp. 213-227 ◽  
Author(s):  
Howard Nothhaft ◽  
Hanna Stensson
Keyword(s):  
Design Methodology ◽  
Empirical Investigation ◽  
Thought Experiment ◽  
Principal Agent Theory ◽  
Content Type ◽  
Constructive Dialogue ◽  
Self Interest ◽  
Long Time ◽  
Measurement And Evaluation ◽  
Practical Implications

Purpose The purpose of this paper is to explain the “evaluation deadlock” or “stasis” diagnosed by many authors. The explanation relies on a thought experiment. Design/methodology/approach The paper is conceptual and builds on a thought experiment inspired by qualitative research such as interviews with communication consultants in Sweden. It makes use of principal–agent theory and Akerlof’s theory of lemon markets. Findings A plausible explanation for the evaluation stasis requires consideration of practitioners’ self-interest as businesspeople. The deadlock is explained by an anomaly in practitioner populations and passive or active but covert resistance. If the long-time neglect of measurement and evaluation has led to expectation inflation and overpromising, even well-performing actors might shy away from rigorous measurement and evaluation practices in their own mandates, since they fear being measured against promotional, not realistic standards. At the same time, on the level of industry discourse, these practitioners would still advocate for measurement and evaluation in principle, so as to avoid the suspicion of underperformance. Research limitations/implications The paper suggests an explanation for further empirical investigation. It does not attempt to demonstrate anything else than that the suggestion is plausible and that it warrants further investigation. Practical implications The scientific community engaged in the measurement and evaluation debate appears puzzled by the discrepancy between practitioners’ words and actions. The authors hope that the paper contributes to a more realistic and thus more constructive dialogue between practitioners and academics in the measurement and evaluation debate. Originality/value Inspired by Alvesson and Spicer’s concept of functional stupidity, the paper argues that attempts to explain the evaluation stasis have been marked by circumspection and narrowness. At present, explanations for the evaluation stasis tend to focus on lack of knowledge or inadequate systems or frameworks. The paper offers a more comprehensive explanation.

A neural observer for sensorless speed control of servomotors

2014 ◽  
Vol 31 (8) ◽  
pp. 1668-1678 ◽  
Author(s):  
Jenq-Ruey Horng ◽  
Ming-Shyan Wang ◽  
Tai-Rung Lai ◽  
Sergiu Berinde
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Design Methodology ◽  
Computation Time ◽  
Elman Neural Network ◽  
Content Type ◽  
On Line ◽  
Future Work ◽  
Practical Implications ◽  
Neural Speed

Purpose – Extensive efforts have been conducted on the elimination of position sensors in servomotor control. The purpose of this paper is to aim at estimating the servomotor speed without using position sensors and the knowledge of its parameters by artificial neural networks (ANNs). Design/methodology/approach – A neural speed observer based on the Elman neural network (NN) structure takes only motor voltages and currents as inputs. Findings – After offline NNs training, the observer is incorporated into a DSP-based drive and sensorless control is achieved. Research limitations/implications – Future work will consider to reduce the computation time for NNs training and to adaptively tune parameters on line. Practical implications – The experimental results of the proposed method are presented to show the effectiveness. Originality/value – This paper achieves sensorless servomotor control by ANNs which are seldom studied.

Why companies succeed or fail: corporate cycles and firm function in tandem

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Panos Mourdoukoutas ◽  
Abraham Stefanidis
Keyword(s):  
Design Methodology ◽  
Equity Valuation ◽  
Social Functions ◽  
Wall Street ◽  
Content Type ◽  
Revenue Growth ◽  
Growth Decline ◽  
Long Time ◽  
Conceptual Study ◽  
Practical Implications

Purpose This paper aims to underscore the need for developing a model of corporate cycles, which can explain how corporations rise, decline and fall in the marketplace. Design/methodology/approach This is a conceptual study that draws on prior theoretical and empirical insights of the entrepreneurial, managerial and social functions of the firm to develop a model of corporate cycles. Findings Firms that pass the test of the market and live for a long time, undergo cycles, expansions and contractions, driven by successes and failures in the way they configure and execute their entrepreneurial, managerial and social, functions. Practical implications A model of corporate cycles can explain how momentum rises and falls on Wall Street. It can also help predict revenue growth, a key variable in equity valuation models. Originality/value The originality of this study stems from a constructive synthesis of different concepts and theories of the firm to explain firms’ growth, decline and fall in the marketplace.

Cause and effect of organizational decline?

2015 ◽  
Vol 31 (4) ◽  
pp. 31-33
Keyword(s):  
Case Studies ◽  
Design Methodology ◽  
Reading Time ◽  
Cutting Edge ◽  
Organizational Decline ◽  
Content Type ◽  
Long Time ◽  
Pertinent Information ◽  
Oil Tanker ◽  
Practical Implications

Purpose – This paper aims to review the latest management developments across the globe and pinpoint practical implications from cutting-edge research and case studies. Design/methodology/approach – This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context. Findings – Think for a moment about how to, in reality, turn around an oil tanker. Is it as easy as spinning around those large wheels we have all seen on TV? Probably not. In fact, it is probably hugely complex and requires significant planning and forethought. This may have been included in the nuances of the original phrase, but it has since been lost, and instead we are left with a rather hackneyed, clichéd phrase that simply implies something taking a long time when there is no time to spare. Practical implications – The paper provides strategic insights and practical thinking that have influenced some of the world’s leading organizations. Originality/value – The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy-to-digest format.

The cooperative factor

2020 ◽  
Vol 36 (7) ◽  
pp. 1-3
Keyword(s):  
Case Studies ◽  
Design Methodology ◽  
Reading Time ◽  
Cutting Edge ◽  
Global Marketplace ◽  
Content Type ◽  
Long Time ◽  
Pertinent Information ◽  
Levels Of Support ◽  
Practical Implications

Purpose This paper aims to review the latest management developments across the globe and pinpoint practical implications from cutting-edge research and case studies. Design/methodology/approach This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context. Findings Employee-owned businesses (EOBs) have been around for a long time now, yet despite calls for them to be provided greater levels of support in the last decade, they still remain a minority on the global marketplace. This review looks at why this should be rethought. Originality/value The briefing saves busy executives, strategists and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy-to-digest format.

Consumer value creation through WhatsApp use

2019 ◽  
Vol 32 (4) ◽  
pp. 455-471
Author(s):  
Jorge Cruz-Cárdenas ◽  
Jorge Guadalupe-Lanas ◽  
Ekaterina Zabelina ◽  
Andrés Palacio-Fierro ◽  
Margarita Velín-Fárez ◽  
...  
Keyword(s):  
Latin American ◽  
Value Creation ◽  
Emotional Support ◽  
Design Methodology ◽  
Instant Messaging ◽  
Role Performance ◽  
Content Type ◽  
Consumer Value ◽  
Depth Interviews ◽  
Practical Implications

Purpose The purpose of this paper is to understand in-depth how consumers create value in their lives using WhatsApp, the leading mobile instant messaging (MIM) application. Design/methodology/approach The study adopts the perspective of customer-dominant logic (CDL) and uses a qualitative multimethod design involving 3 focus groups and 25 subsequent in-depth interviews. The research setting was Ecuador, a Latin American country. Findings Analysis and interpretation of the participants’ stories made it possible to identify and understand the creation of four types of value: maintaining and strengthening relationships; improving role performance; emotional support; and entertainment and fun. In addition, the present study proposes a conceptual model of consumer value creation as it applies to MIM. Practical implications Understanding the way consumers create value in their lives using MIM is important not only for organizations that offer MIM applications, but also for those companies that develop other applications for mobile phones or for those who wish to use MIM as an electronic word-of-mouth vehicle. Originality/value The current study is one of the first to address the topic of consumer behavior in the use of technologies from the perspective of CDL; this perspective enables an integrated qualitative vision of value creation in which the consumer is the protagonist.

scholarly journals Advantages and potential challenges of data management in e-maintenance

2019 ◽  
Vol 25 (3) ◽  
pp. 378-396 ◽  
Author(s):  
Arian Razmi-Farooji ◽  
Hanna Kropsu-Vehkaperä ◽  
Janne Härkönen ◽  
Harri Haapasalo
Keyword(s):  
Data Management ◽  
Design Methodology ◽  
Management Practices ◽  
Future Research ◽  
Conceptual Approach ◽  
Content Type ◽  
Different Types ◽  
Maintenance Systems ◽  
Industry Leader ◽  
Practical Implications

Purpose The purpose of this paper is twofold: first, to understand data management challenges in e-maintenance systems from a holistically viewpoint through summarizing the earlier scattered research in the field, and second, to present a conceptual approach for addressing these challenges in practice. Design/methodology/approach The study is realized as a combination of a literature review and by the means of analyzing the practices on an industry leader in manufacturing and maintenance services. Findings This research provides a general understanding over data management challenges in e-maintenance and summarizes their associated proposed solutions. In addition, this paper lists and exemplifies different types and sources of data which can be collected in e-maintenance, across different organizational levels. Analyzing the data management practices of an e-maintenance industry leader provides a conceptual approach to address identified challenges in practice. Research limitations/implications Since this paper is based on studying the practices of a single company, it might be limited to generalize the results. Future research topics can focus on each of mentioned data management challenges and also validate the applicability of presented model in other companies and industries. Practical implications Understanding the e-maintenance-related challenges helps maintenance managers and other involved stakeholders in e-maintenance systems to better solve the challenges. Originality/value The so-far literature on e-maintenance has been studied with narrow focus to data and data management in e-maintenance appears as one of the less studied topics in the literature. This research paper contributes to e-maintenance by highlighting the deficiencies of the discussion surrounding the perspectives of data management in e-maintenance by studying all common data management challenges and listing different types of data which need to be acquired in e-maintenance systems.

An exploratory empirical study of whistleblowing and whistleblowers

2020 ◽  
Vol 27 (3) ◽  
pp. 755-770
Author(s):  
Maria Krambia-Kapardis
Keyword(s):  
Statistical Analysis ◽  
Design Methodology ◽  
Research Topic ◽  
Due Date ◽  
Content Type ◽  
Unethical Behaviour ◽  
Eu Member States ◽  
European Directive ◽  
Original Survey ◽  
Practical Implications

Purpose The purpose of this study is to develop a profile of whistleblowers and to determine whether whistleblowing legislation would encourage those individuals to bring to light some illegal or unethical behaviour that otherwise would remain in the shadows. Design/methodology/approach Having identified whistleblowing correlation, a survey was carried out in Cyprus of actual whistleblowers and could-have-been whistleblowers. Findings Males between 46 and55 years of age, regardless of whether they have dependents or hold senior positions in organizations are significantly more likely to blow the whistle. However, could-have-been whistleblowers did not go ahead because they felt that the authorities would not act on their information. Research limitations/implications Because of the sensitive nature of the research topic and the fact that only whistleblowers or intended whistleblowers could participate in the study, the sample size is limited as a result. This, in turn, limits both the number of respondents in each category (actual and intended) as well as constrains the statistical analysis that could be carried out on the data. Practical implications It remains to be seen whether EU Member States shall implement the European Directive 2019/1937 on the protection of persons who report breaches of Union Law, in its entirety by the due date, namely December 2021. Originality/value This study provides a literature review of whistleblowing and reports an original survey against the backdrop of the European Directive.

How Phillips saw the light

2020 ◽  
Vol 36 (8) ◽  
pp. 29-31
Keyword(s):  
Design Methodology ◽  
Reading Time ◽  
Daily Basis ◽  
Business World ◽  
Content Type ◽  
Freak Show ◽  
The World ◽  
Pertinent Information ◽  
The One ◽  
Practical Implications

Purpose Reviews the latest management developments across the globe and pinpoints practical implications from cutting-edge research and case studies. Design/methodology/approach This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context. Findings The problem with developing a reputation of being something of an oracle in the business world is that all of a sudden, everyone expects you to pull off the trick of interpreting the future on a daily basis. Like a freak show circus act or one-hit wonder pop singer, people expect you to perform when they see you, and they expect you to perform the thing that made you famous, even if it is the one thing in the world you don’t want to do. And when you fail to deliver on these heightened expectations, you are dismissed as a one trick pony, however good that trick is in the first place. Originality/value The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy-to-digest format.

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