scholarly journals Tracking Problem for Induction Electric Drive under Influence of Unknown Perturbation * *The work was partially supported by Russian Foundation for Basic Research under project 15-08-01543A and Russian Ministry of education under project MD–5336.2016.8, and by the European Commission under DIONICOS Project 612707 and Coventry University, UK.

2017 ◽  
Vol 50 (1) ◽  
pp. 9790-9795 ◽  
Author(s):  
Sergey A. Kochetkov ◽  
Svetlana A. Krasnova ◽  
Victor A. Utkin ◽  
Yuri A. Vershinin
2019 ◽  
Vol 124 ◽  
pp. 01037 ◽  
Author(s):  
V. N. Meshcheryakov ◽  
D. V. Lastochkin ◽  
Z.M. Shakurova ◽  
S. Valtchev

This paper discusses the wound rotor induction motor and variable-frequency drive (VFD) that regulates the stator voltage frequency. The stator and rotor windings are connected to a common electrical circuit. The slip energy of the motor goes to the DC link and feeds the stator winding of the motor. The block diagram of the electric drive, the equivalent circuit and the basic characteristic of the cascade VFD are considered. It is shown that the energy-saving mode with a minimum ratio “stator current/torque” is achieved at an angle between vectors of the stator current and the excitation current at the level of 45 degrees. The experimental static mechanical characteristics of the electric drive were obtained. These characteristics provide a limitation of the starting torque.


2020 ◽  
pp. 26-32
Author(s):  
A. V. Sandulyak ◽  
◽  
R. Yu. Tkachenko ◽  
A. A. Sandulyak ◽  
V. A. Ershova ◽  
...  

It has been noted that the information on magnetic properties of specific magnets available in the design and operation of magnetic separators/analyzers using magnetic fillers in the form of balls as the working body (polygradient type) is extremely limited, especially for magnets with varying sphericity coefficients (mutual ratios of characteristic sizes). Experiments using cylindrical samples (porous) as a ferromagnetic matrix rendered the induction data subsequently applied to establish the magnetic permeability, susceptibility, and magnetization values for the samples at various values of the length-todiameter ratio of φ = 1–16. The demagnetizing factor N was obtained and analyzed for the «short» samples (1 ≤ φ [φ]) in the range of magnetizing field strengths of 9–47 kA/m, taking into account the established transient value of φ = [φ] = 10–12 (when, at φ ≥ [φ], the magnetic properties of the sample correspond to the magnetic properties of its quasi-solid material). The analysis results for these data, required when assessing the actual magnetic properties of «short» working bodies, characteristic of polygradient magnetic separators/ analyzers, demonstrate the validity of the exponential dependence (decreasing with increasing) of their demagnetizing factor. The research was carried out with the financial support of the Ministry of Education and Science of the Russian Federation within the framework of the State Assignment in the field of science (project No. 0706-2020-0024) and of the Russian Foundation for Basic Research and the Royal Society of London under research project No. 20-52-10006.


2009 ◽  
Vol 81 (11) ◽  
pp. iv
Author(s):  
Edward Karakhanov

The 2nd International IUPAC Conference on Green Chemistry (ICGC-2) was held 14-20 September 2008 aboard the ship "Alexander Radishev" traveling from Moscow to St. Petersburg, Russia. The conference was organized by the Russian Academy of Sciences, the Russian Foundation of Basic Research, the Russian Ministry of Education and Science, and M. V. Lomonosov Moscow State University. The opening ceremony was held in the aula of the new Intellectual Center, Fundamental Library of Moscow State University.The scientific program was centered around a number of fundamental and applied topics such as- environmentally safe reagents and synthesis routes,- heterogeneous catalysis,- homogeneous and enzyme catalysis,- prospective environmentally safe energy sources,- use of renewables in the chemical processes,- environmentally safe technologies of chemical products, and- education in the field of green chemistryThe conference program included 7 plenary lectures, 10 keynote lectures, 37 oral contributions, and 120 poster presentations. Two round-table discussions were also organized. The first was organized by Prof. Hemda Garelick (Middlesex University, London) and examined the environmental context for "green chemistry" and addressed its relationship with the subject area of "environmental chemistry". The second was organized by Prof. Valery Lunin (Chemistry Department of M. V. Lomonosov Moscow State University, Moscow) and was devoted to the discussion of the theoretical and practical aspects of the use of supercritical fluids in chemistry and technology.The conference attracted over 360 participants from 39 countries and 4 continents. IUPAC's green chemistry activities were presented by Prof. P. Tundo, President of IUPAC's Organic and Biomolecular Chemistry Division (INCA and Ca' Foscari University of Venice) and Prof. B. Han, Chair of the IUPAC Subcommittee on Green Chemistry. The plenary and keynote lectures with the choice of oral contributions published in this issue of Pure and Applied Chemistry cover each topic of the conference.We look forward to the 3rd International Conference on Green Chemistry to be held in August 2010 in Canada.Edward KarakhanovConference Editor


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