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Design and Material Selection of High-Speed Rotating Electrical Machines

Uzhegov, Nikita (2016-06-03)

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Nikita Uzhegov A4.pdf (22.61Mb)
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Väitöskirja

Uzhegov, Nikita
03.06.2016
Lappeenranta University of Technology

Acta Universitatis Lappeenrantaensis

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Julkaisun pysyvä osoite on
http://urn.fi/URN:ISBN:978-952-265-966-8

Tiivistelmä

The increasing emphasis on energy efficiency is starting to yield results in the reduction
in greenhouse gas emissions; however, the effort is still far from sufficient. Therefore,
new technical solutions that will enhance the efficiency of power generation systems are
required to maintain the sustainable growth rate, without spoiling the environment. A
reduction in greenhouse gas emissions is only possible with new low-carbon
technologies, which enable high efficiencies.
The role of the rotating electrical machine development is significant in the reduction of
global emissions. A high proportion of the produced and consumed electrical energy is
related to electrical machines. One of the technical solutions that enables high system
efficiency on both the energy production and consumption sides is high-speed electrical
machines. This type of electrical machines has a high system overall efficiency, a small
footprint, and a high power density compared with conventional machines. Therefore,
high-speed electrical machines are favoured by the manufacturers producing, for
example, microturbines, compressors, gas compression applications, and air blowers.
High-speed machine technology is challenging from the design point of view, and a lot
of research is in progress both in academia and industry regarding the solution
development. The solid technical basis is of importance in order to make an impact in the
industry considering the climate change.
This work describes the multidisciplinary design principles and material development in
high-speed electrical machines. First, high-speed permanent magnet synchronous
machines with six slots, two poles, and tooth-coil windings are discussed in this doctoral
dissertation. These machines have unique features, which help in solving rotordynamic
problems and reducing the manufacturing costs.
Second, the materials for the high-speed machines are discussed in this work. The
materials are among the key limiting factors in electrical machines, and to overcome this
limit, an in-depth analysis of the material properties and behavior is required. Moreover,
high-speed machines are sometimes operating in a harsh environment because they need
to be as close as possible to the rotating tool and fully exploit their advantages. This sets
extra requirements for the materials applied.
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53851 Lappeenranta
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