National Repository of Grey Literature 119 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Revision of belt conveyor drive
Kledus, Erik ; Hájek, Vítězslav (referee) ; Veselka, František (advisor)
The theme of the bachelor work is the revision of the conveyor belt drive. It contains a description of the belt drive, its distribution and possible malfunctions. It also contains the results of the revision. It deals with the formation of static charge and its elimination. Bachelor work also includes measurements and tests performed on conveyor drive.
Consequences of increasing the efficiency of small motors.
Buchta, Martin ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
This bachelor thesis deals with the consequences of increasing the efficiency of small asynchronous motors up to 1kW. This work is written in response to ever-increasing demands on minimal efficiency for asynchronous engines, whether through European Union legislation or just competition between manufacturers. The aim of the thesis is therefore to evaluate measures to increase efficiency. The evaluation refers to the consumption of the active material and the weight of the individual treatments. For the evaluation itself, it was necessary to first study the final papers written at this faculty concerning the efficiency of small asynchronous motors. After studying these works, it was necessary to select those measures which, with their minor costs, are least demanding, lead to an increase in efficiency of at least 1% and also to compare these measures with each other. The asynchronous engine of ATAS a.s. with a power of 600W. Three measures to improve efficiency were selected for this engine, mainly related to the diameters of the winding conductor used, the change in the number of threads, and, possibly, the extension of the length of the circuit. These three measures made a rough financial analysis of the price for active material. The prices of active material were found from manufacturers or suppliers.
Equipment for position adjustment of brushes holder
Škoda, Josef ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
My bachelor’s thesis is aimed at problematics of lifetime of DC motor. After a theoretical analysis the improvements were designed which can adjust the right position of the brushes and this will also improve commutation and the general properties of the DC motor.
Options for increasing the efficiency of small motors.
Kusý, Karel ; Janda, Marcel (referee) ; Hájek, Vítězslav (advisor)
This bachelor thesis concerns itself with the possibilities of achieving higher efficiency of small asynchronous motors and their manufacturing costs. The following chapters describe the design, function and principles of speed regulation of the asynchronous motor. Next, losses that occur during motor operation and ways of reducing them, are described. The last chapter of the thesis addreses factors that influence the manufacturing costs of the asynchornous motor and evaluates the material costs of one modified motor.
Degradation of insulating materials due to foreign particles
Hoferek, Jiří ; Hájek, Vítězslav (referee) ; Veselka, František (advisor)
The work is devoted to the influence of dust particles on the operation of rotating machines with sliding contact. In the work are described and characterized dust particles from environment of selected machines. Their influence on sliding contact and influence on the insulation system of these machines is investigated.
Special small induction motor
Trubák, Vojtěch ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
This term paper is focused on theory and calculation of an induction motor with solid rotor. It is divided into six chapters, the first one being an introduction and the last being a conclusion. Second chapter is dedicated to magnetism. There is briefly description of a skin depth of a conductor and calculation method for impedance of a conductive solid. Third chapter is focused on theory of an induction machines, their construction, equivalent circuit and some of their properties. Fourth chapter is dedicated to calculation of an induction motor with solid rotor and its parameters. Fifth chapter is comparing results of calculation done in fourth chapter for an already existing motor with measured values.
Analysis and Innovation systems of Vehicle Lighting
Straka, Ondřej ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
Subject semestral thesis is diagnosis primary objective luminosity plus elaboration background research primary objective plus modern waies lighting. Work includes indicative allocation light fitting, systems plus possibilities increasing safeness on roads by using modern systems facilitating movement and behind handicap. Are here also circumscribed systems facilitating visibility in night o'clock plus manners realization of all these systems.
Impact of core length on efficiency of a single phase induction machine
Binek, Martin ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
This bachelor's thesis analyses the impact of core length on efficiency of a single phase induction machine with a run capacitor in the auxiliary winding. The whole thesis can be divided into two parts. The first part of the thesis includes general knowledge concerning single phase induction machines and technical base for its analytical calculation. The second part works with the actual technical documentation of a motor. This part includes creation of the motor model in RMxprt module, analytical calculation for verifying the motor properties and laboratory measurement, where the results are primarily compared to RMxprt simulation as well as to the analytical calculation, mainly from the efficiency perspective.
Problems revisions electric machine with a slip device, including an additional device
Ščepka, Ondrej ; Hájek, Vítězslav (referee) ; Veselka, František (advisor)
This Bachelor's thesis describes an issues of an revisions on electric engine equipped with brush. Electric engines with brushing are described in the first part. In the second one is focused on the introduction with necessary standards for performing of revisions of the electric equipment and on the clarification of terms used during the revisions of the electric equipment. The work continues with more detailed description of brushing contact in the electric engine and with the description of its parts. In the next part I have become more familiar with the electric engine that will be inspected. The final part of thesis contains sequence of measurements. I registered and handled recorded measured values mandatory for the issuing of revision report.
Proposal of electrical equipment for soaking and drying cores for making castings
Čermák, Jiří ; Hájek, Vítězslav (referee) ; Veselka, František (advisor)
This diploma thesis deals with proposal of electrical equipment for soaking and drying cores for making castings at foundry in a Great Britain. It brings look at system of technical norms ČSN and it compares it with british system of technical norms British standards. The second part of this thesis contains detailed proposal of this equipment, including specification of control system, specification of power supply cables and control cables and particular technological units. The whole project documentation is enclosed as an inseparable attachment of this diploma thesis.

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See also: similar author names
5 Hájek, Viktor
6 Hájek, Vojtěch
7 Hájek, Václav
1 Hájek, Vít
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