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Detalles de la revista
Formato
Revista
eISSN
2255-8896
Publicado por primera vez
18 Mar 2008
Periodo de publicación
6 veces al año
Idiomas
Inglés

Buscar

Volumen 55 (2018): Edición 4 (August 2018)

Detalles de la revista
Formato
Revista
eISSN
2255-8896
Publicado por primera vez
18 Mar 2008
Periodo de publicación
6 veces al año
Idiomas
Inglés

Buscar

7 Artículos
Acceso abierto

Active Zone of Permanent Magnet Synchronous Machine with a Non-Overlapping Concentrated Winding

Publicado en línea: 25 Sep 2018
Páginas: 3 - 12

Resumen

Abstract

The research is devoted to the investigation of NdFeB permanent magnet (PM) based synchronous generators with non-overlapping concentrated windings. The rotor of such a generator has 10 pole pairs (PMs), which is dictated by the nominal voltage frequency (f=50 Hz) and the rotational speed (n=300 RPM). Comparison is made for four generators with three-phase winding coils and stator tooth numbers 18, 21, 24 and 27.

Palabras clave

  • active zone
  • permanent magnet synchronous generator
  • torque
Acceso abierto

Re-Use and Recycling of Different Electrical Machines

Publicado en línea: 25 Sep 2018
Páginas: 13 - 23

Resumen

Abstract

The paper discusses the current developments in the recycling of electrical machines. The main attention is devoted to three types of motors: synchronous reluctance motor, permanent magnet assisted synchronous reluctance motor, and induction motor. Base materials of such electrical machines are also described in the paper. Rare-earth permanent magnets used in electrical machines are review separately. Moreover, the paper considers the features of the disassembly and recycling options.

Palabras clave

  • electric machines
  • induction motors
  • permanent magnet motors
  • recycling
Acceso abierto

Consideration of Solution for Enhancement of Frequency Converter Supply Power Parameters

Publicado en línea: 25 Sep 2018
Páginas: 24 - 34

Resumen

Abstract

The paper presents results of analysis of a possible solution for enhancement of frequency converter (FC) AC supply power parameters. The method proposed is based on switched stabilisation of DC current of FC front-end rectifier unit. Such stabilisation allows obtaining rather good AC supply power parameters, i.e., its power factor and total harmonics distortion (THD) indicator for phase current. The paper also demonstrates a possible realisation scheme, a simplified mathematical description of processes in the scheme, as well as methods for consideration of its parameters, accounting the rated power of FC and the appointed level of the rectifier DC current continuity ratio. The results of computer simulation, to a great extent, testify a possible enhancement level.

Palabras clave

  • converter
  • frequency
  • inductor
  • inverter
  • load
  • power
  • rectifier
  • ripple
  • stabilisation
  • switch
  • switching
Acceso abierto

Towards a Home Energy Management Model Through a Coordinator of Smart Sockets

Publicado en línea: 25 Sep 2018
Páginas: 35 - 43

Resumen

Abstract

The efficient use of energy and its implementation in domestic automation systems is an essential requirement in Smart Cities. However, this requires appropriate measurement devices and an M2M control-communication alternative that offers real-time visualization of the information. This article proposes a prototype of the home electric power consumption management platform, as an advance in generating a model for future Smart Grid. Therefore, the research implements smart socket devices and a coordinator of the communication of a home area network between these measuring devices to have an intelligent control of electric power. As a result, real-time data of the defined electrical parameters have been obtained. This information has been stored in the Internet cloud, also allowing remotely programming and controlling these measurement devices. The present research contributes to generating a profile of total load consumption for residential users and allowing them to know and compare their real consumption with what was reported by the distributors.

Palabras clave

  • HEMS
  • smart metering
  • smart socket
  • smart grid
  • smart cities
Acceso abierto

The Development of Nanotechnologies and Advanced Materials Industry in Science and Entrepreneurship: Legal Indicators. A Case Study of Latvia (Part Four)

Publicado en línea: 25 Sep 2018
Páginas: 44 - 56

Resumen

Abstract

The present scientific paper is the fourth part and continuation of the in-depth scientific study of the developed system of engineering economic indicators, where the authors obtain results from the scientific research presented in a series of works on the development of the nanotechnologies and advanced materials industry in science and entrepreneurship in Latvia. Part Four determines the essential legal indicators of the development of nano-field at the macro, micro, and meso development levels of the economic environment in Latvia. The paper provides the interaction of new identified indicators of nano-field in terms of further scientific and practical activities. Latvia is analysed in comparison with other countries in the world.

Palabras clave

  • advanced materials
  • development of science
  • economic environment level
  • engineering economic indicator system
  • legal indicators
  • nanotechnologies
Acceso abierto

Identification of Maritime Technology Development Mechanisms in the Context of Latvian Smart Specialisation and Blue Growth

Publicado en línea: 25 Sep 2018
Páginas: 57 - 69

Resumen

Abstract

Recognising the fact that economic realities change the world faster than global politics, in 2010 the European Commission approved the strategy for smart, sustainable and inclusive growth, called EUROPE 2020, in order to promote greater economic independence and achieve a more sustainable future. The strategy puts forward three mutually reinforcing priorities: (P1) Smart Growth: developing an economy based on knowledge and innovation; (P2) Sustainable Growth: Promoting a more resource efficient, greener and more competitive economy; (P3) Inclusive Growth: Promoting a high-employment economy delivering social and territorial cohesion.

In the context of EUROPE 2020, the Smart Specialisation Strategy in Latvia (RIS3) has been set up and introduced as a strategic document for the development of support mechanisms of high value-added economic growth, including the maritime technology sector.

The present study explores the mechanisms for the introduction of Blue Growth and RIS3 Strategies, which should be used to develop the maritime technology industry by assessing the efficiency of these mechanisms. Thus, the study addresses the issues of the implementation of modern technologies in the coastal municipalities and planning regions of Latvia.

Palabras clave

  • Blue Growth
  • maritime technologies
  • Smart Specialisation
Acceso abierto

Calculation Possibilities of 3D Parameters for Surfaces with Irregular Roughness

Publicado en línea: 25 Sep 2018
Páginas: 70 - 79

Resumen

Abstract

In the scientific research, calculations of roughness parameters are carried out, with the aim of comparing measured values of roughness parameters with the calculated ones by normal random field equations. First of all, roughness measurement experiments for surfaces with irregular roughness are carried out to determine the roughness parameters and the ordinate distribution histograms using modern measuring equipment Taylor Hobson Talysurf Intra 50. Using the obtained experimental data, Pearson criterion calculations are made in order to check the compliance of surface ordinate distribution function to normal Gaussian distribution law. The obtained results showed that for all investigated samples the surface ordinate distribution function complies with normal Gaussian distribution law. The next step is the calculation of several 3D roughness parameters (from the standard ISO 25178-2). According to the obtained results it is concluded that the calculated values of surface roughness parameters Sa, Sp, Spc, Sdq, Sdr are quite close to the values obtained by measuring equipment Taylor Hobson. The acquired formulas may be applicable for determination of 3D roughness parameters.

Palabras clave

  • distribution function
  • 3D roughness parameters
  • Pearson criterion
  • surface texture
7 Artículos
Acceso abierto

Active Zone of Permanent Magnet Synchronous Machine with a Non-Overlapping Concentrated Winding

Publicado en línea: 25 Sep 2018
Páginas: 3 - 12

Resumen

Abstract

The research is devoted to the investigation of NdFeB permanent magnet (PM) based synchronous generators with non-overlapping concentrated windings. The rotor of such a generator has 10 pole pairs (PMs), which is dictated by the nominal voltage frequency (f=50 Hz) and the rotational speed (n=300 RPM). Comparison is made for four generators with three-phase winding coils and stator tooth numbers 18, 21, 24 and 27.

Palabras clave

  • active zone
  • permanent magnet synchronous generator
  • torque
Acceso abierto

Re-Use and Recycling of Different Electrical Machines

Publicado en línea: 25 Sep 2018
Páginas: 13 - 23

Resumen

Abstract

The paper discusses the current developments in the recycling of electrical machines. The main attention is devoted to three types of motors: synchronous reluctance motor, permanent magnet assisted synchronous reluctance motor, and induction motor. Base materials of such electrical machines are also described in the paper. Rare-earth permanent magnets used in electrical machines are review separately. Moreover, the paper considers the features of the disassembly and recycling options.

Palabras clave

  • electric machines
  • induction motors
  • permanent magnet motors
  • recycling
Acceso abierto

Consideration of Solution for Enhancement of Frequency Converter Supply Power Parameters

Publicado en línea: 25 Sep 2018
Páginas: 24 - 34

Resumen

Abstract

The paper presents results of analysis of a possible solution for enhancement of frequency converter (FC) AC supply power parameters. The method proposed is based on switched stabilisation of DC current of FC front-end rectifier unit. Such stabilisation allows obtaining rather good AC supply power parameters, i.e., its power factor and total harmonics distortion (THD) indicator for phase current. The paper also demonstrates a possible realisation scheme, a simplified mathematical description of processes in the scheme, as well as methods for consideration of its parameters, accounting the rated power of FC and the appointed level of the rectifier DC current continuity ratio. The results of computer simulation, to a great extent, testify a possible enhancement level.

Palabras clave

  • converter
  • frequency
  • inductor
  • inverter
  • load
  • power
  • rectifier
  • ripple
  • stabilisation
  • switch
  • switching
Acceso abierto

Towards a Home Energy Management Model Through a Coordinator of Smart Sockets

Publicado en línea: 25 Sep 2018
Páginas: 35 - 43

Resumen

Abstract

The efficient use of energy and its implementation in domestic automation systems is an essential requirement in Smart Cities. However, this requires appropriate measurement devices and an M2M control-communication alternative that offers real-time visualization of the information. This article proposes a prototype of the home electric power consumption management platform, as an advance in generating a model for future Smart Grid. Therefore, the research implements smart socket devices and a coordinator of the communication of a home area network between these measuring devices to have an intelligent control of electric power. As a result, real-time data of the defined electrical parameters have been obtained. This information has been stored in the Internet cloud, also allowing remotely programming and controlling these measurement devices. The present research contributes to generating a profile of total load consumption for residential users and allowing them to know and compare their real consumption with what was reported by the distributors.

Palabras clave

  • HEMS
  • smart metering
  • smart socket
  • smart grid
  • smart cities
Acceso abierto

The Development of Nanotechnologies and Advanced Materials Industry in Science and Entrepreneurship: Legal Indicators. A Case Study of Latvia (Part Four)

Publicado en línea: 25 Sep 2018
Páginas: 44 - 56

Resumen

Abstract

The present scientific paper is the fourth part and continuation of the in-depth scientific study of the developed system of engineering economic indicators, where the authors obtain results from the scientific research presented in a series of works on the development of the nanotechnologies and advanced materials industry in science and entrepreneurship in Latvia. Part Four determines the essential legal indicators of the development of nano-field at the macro, micro, and meso development levels of the economic environment in Latvia. The paper provides the interaction of new identified indicators of nano-field in terms of further scientific and practical activities. Latvia is analysed in comparison with other countries in the world.

Palabras clave

  • advanced materials
  • development of science
  • economic environment level
  • engineering economic indicator system
  • legal indicators
  • nanotechnologies
Acceso abierto

Identification of Maritime Technology Development Mechanisms in the Context of Latvian Smart Specialisation and Blue Growth

Publicado en línea: 25 Sep 2018
Páginas: 57 - 69

Resumen

Abstract

Recognising the fact that economic realities change the world faster than global politics, in 2010 the European Commission approved the strategy for smart, sustainable and inclusive growth, called EUROPE 2020, in order to promote greater economic independence and achieve a more sustainable future. The strategy puts forward three mutually reinforcing priorities: (P1) Smart Growth: developing an economy based on knowledge and innovation; (P2) Sustainable Growth: Promoting a more resource efficient, greener and more competitive economy; (P3) Inclusive Growth: Promoting a high-employment economy delivering social and territorial cohesion.

In the context of EUROPE 2020, the Smart Specialisation Strategy in Latvia (RIS3) has been set up and introduced as a strategic document for the development of support mechanisms of high value-added economic growth, including the maritime technology sector.

The present study explores the mechanisms for the introduction of Blue Growth and RIS3 Strategies, which should be used to develop the maritime technology industry by assessing the efficiency of these mechanisms. Thus, the study addresses the issues of the implementation of modern technologies in the coastal municipalities and planning regions of Latvia.

Palabras clave

  • Blue Growth
  • maritime technologies
  • Smart Specialisation
Acceso abierto

Calculation Possibilities of 3D Parameters for Surfaces with Irregular Roughness

Publicado en línea: 25 Sep 2018
Páginas: 70 - 79

Resumen

Abstract

In the scientific research, calculations of roughness parameters are carried out, with the aim of comparing measured values of roughness parameters with the calculated ones by normal random field equations. First of all, roughness measurement experiments for surfaces with irregular roughness are carried out to determine the roughness parameters and the ordinate distribution histograms using modern measuring equipment Taylor Hobson Talysurf Intra 50. Using the obtained experimental data, Pearson criterion calculations are made in order to check the compliance of surface ordinate distribution function to normal Gaussian distribution law. The obtained results showed that for all investigated samples the surface ordinate distribution function complies with normal Gaussian distribution law. The next step is the calculation of several 3D roughness parameters (from the standard ISO 25178-2). According to the obtained results it is concluded that the calculated values of surface roughness parameters Sa, Sp, Spc, Sdq, Sdr are quite close to the values obtained by measuring equipment Taylor Hobson. The acquired formulas may be applicable for determination of 3D roughness parameters.

Palabras clave

  • distribution function
  • 3D roughness parameters
  • Pearson criterion
  • surface texture

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