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Efficiency improvement possibilities of single-phase line-start synchronous machines
Mareček, Šimon ; Klíma, Petr (referee) ; Lolová, Iveta (advisor)
With increase in consumption of electric energy there is also increase of cost related to operation of single-phase induction motors (SPIM), which are mostly used in household applications. This is the reason of focusing thesis to single-phase line-start permanent magnet synchronous machines (SPLSPMSM), which has higher initial costs but also higher efficiency so they have potential to replace single-phase induction motors. That is the reason why the first chapter presents a literary research focusing on the topic of induction machines. The next chapter is dedicated to literary research of used SPLSPMSM and deals not only with their construction but also with transient phenomenon and steady state. Readers will learn about most common used laying of permanent magnets in SPLSPMSM in the next section. Then there continues chapter with possibilities of synchronization increasing because it is an important phenomenon connected with this type of rotating machines. Mathematical model is present in the next section of thesis. There are written equations, which lead to creating an analytical model. An equally important part presents an electromagnetic model and his description, which follows right after mathematical model. There are summarized the most important parameters and their influence on the efficiency of SPLSPMSM in the last but one chapter. In the last chapter there is a comparison between the mathematical and electromagnetic model.
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The influence of electrolyte additives to lead-acid batteries properties
Dohnal, Martin ; Zimáková, Jana (referee) ; Bača, Petr (advisor)
This day is a lead battery is most prevalent in the automotive industry. Which is a source of energy when starting the car. In recent times the battery is used not only for startups, but also when driving in city traffic. This behavior can know the concept of a hybrid car. Which is used an electric motor which as a result reduce emissions standing cars in cities. The electric motor is powered by lead-acid battery and a rapid discharging and reducing battery life. To extend the life developed additives to the electrolyte. In the thesis, these additives investigated. If they really have a positive effect on the battery.
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Control Unit for Church Bell Electric Drive
Bureš, Petr ; Novák, Pavel (referee) ; Šebesta, Jiří (advisor)
This work deals with analysis induction motors. There are described their principle and methods of starting, the engine controls and the stop braking. In terms of this study it was determined the engine controls type for control unit for church bell electric drive design. In next part there is complete hardware and software design of control unit.
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The influence of electrolyte additives to lead-acid batteries properties
Dohnal, Martin ; Zimáková, Jana (referee) ; Bača, Petr (advisor)
This day is a lead battery is most prevalent in the automotive industry. Which is a source of energy when starting the car. In recent times the battery is used not only for startups, but also when driving in city traffic. This behavior can know the concept of a hybrid car. Which is used an electric motor which as a result reduce emissions standing cars in cities. The electric motor is powered by lead-acid battery and a rapid discharging and reducing battery life. To extend the life developed additives to the electrolyte. In the thesis, these additives investigated. If they really have a positive effect on the battery.
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Control Unit for Church Bell Electric Drive
Bureš, Petr ; Novák, Pavel (referee) ; Šebesta, Jiří (advisor)
This work deals with analysis induction motors. There are described their principle and methods of starting, the engine controls and the stop braking. In terms of this study it was determined the engine controls type for control unit for church bell electric drive design. In next part there is complete hardware and software design of control unit.
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