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Claw-pole automotive alternator design.
Szekeres, Vojtech ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
The thesis deals with the alternators used in passenger cars, their desing, function and typical behaviours and characteristics and design. Alternators are specific with the trapezoidal shape of rotor poles, which produce a waveform similar to a square wave instead of a sinusoid. This is more desirable for simple rectification to direct current, which is used in the electrical distribution system of automobiles. Because of the shape of the poles, these alternators are also called the claw-pole. The design itself consists of creating an alternator in Ansys Maxwell software in compliance with real measured alternator. The results are compared numerically and also graphically.
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A small three phase induction motor
Klíma, Petr ; Cipín, Radoslav (referee) ; Mach, Martin (advisor)
The main object of this bachelor thesis is to determine the parameters of the induction motor with an output of 155 W. Three ways of obtaining the parameters were chosen. Analytical calculation according to available literature, calculation in RMxprt program and laboratory measurement of the motor. For a better comparison of analytical calculations, two literary sources were chosen according to which the calculation was performed. Individual calculations and values obtained by them are included in the thesis. A comparison of the results obtained by individual methods is performed.
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Experimatal Analysis of Windshield Wipers Motors
Dočekal, Martin ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
The work deals with the methods of measurement of small DC motors, especially motors used for drives wiper’s mechanisms. Furthermore, describing the internal structure and function of wiper’s engines. Measurement of these engines is carried out mainly dynamometers which is described in more details in the work. However, measuring systems consist not only from the dynamometer but also many other components such as controllers, software for testing engines, various stands, temperature and speed testers, and many others. These components are taken into account, when selecting the most suitable measuring system. There are also various systems analyzed and compared in terms of both technical and economic parameters, but also in terms of measurement options, such as immediate viewing characteristics on a PC monitor of the system assembly, the possibility of measuring the friction torque, efficiency, heating, etc. In conclusion, there is a recommendation of measuring system which I chose as the best option according to its parameters.
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Synchronous motor speed control
Šatava, Patrik ; Mach, Martin (referee) ; Ondrůšek, Čestmír (advisor)
This bachelor’s thesis deals mainly with methods for control of synchronous motors for use in electrical drives. In the first part of the thesis the generic theory of a synchronous machine is presented. Furthermore, this part also deals with Park’s linear transformation of the synchronous machine’s equations, and the stability of the machine. Subsequently, methods for control of a permanent magnet synchronous motor for use in electrical drives are presented. Two major presented methods include the vector control and the direct torque control. Furthermore, the thesis deals shortly with scalar control, which is, however, used rarely nowadays. The last part of the thesis presents measured data of two permanent magnet synchronous motors, powered by a variable frequency AC drive. The data was measured at no load with use of three control methods – scalar control, vector control in open loop-mode, and vector control in closed-loop mode; and at load with use of two control methods – scalar control, and vector control in closed-loop mode.
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Possibilities of improving efficiency of high-speed electrical machine
Nevrzal, Filip ; Mach, Martin (referee) ; Klíma, Jiří (advisor)
First part of this bachelor´s thesis briefly presents basic construction and principle of induction machine, distribution and description of individual losses. In the next part, there is a close look at the measurement of given machine. Next, there is a description of making a model in RMxprt and subsequent comparison of simulated data and characteristics to measured data. Last part describes and compares proposed changes of this motor simulated in RMxprt.
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Measurement and analysis of high speed squirrel cage induction motor
Kaczmarczyk, Ruben ; Mach, Martin (referee) ; Klíma, Jiří (advisor)
The thesis is focused on familiarization with classical asynchronous and high-speed motors, their construction and principle. There are also described constructional peculiarities of the high-speed motor and comparison of losses between both motors. Then, on the basis of production documantation a simplified calculation of the particular asynchronous motor is made. Analytical calculation is also made in RMxprt program after setting of all given parameters of the motor. Experimental measurment upon the laboratory sample for the verification of given qualities is also embodied in the bachelor thesis.
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DC motors for general purposes.
Randa, Daniel ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
This work deals with innovation DC permanent magnet motor for low power. The work is divided into three tasks. The first part is to survey serially produced DC motors. The second part is to choose one particular DC motor drawn from the survey and carry out its analysis and detailed description. The last part is to design innovations to selected DC motor.
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Design of oil distribution transformer
Mrajca, Miroslav ; Mach, Martin (referee) ; Ondrůšek, Čestmír (advisor)
This master thesis deals with the manufacturing process of oil distribution transformers. Firstly, the thesis devotes to the design arrangement of the magnetic circuit and its manufacturing technology. The procedure of cutting laminations for core and their building into the core. Subsequently, the thesis describes technologies used for manufacturing primary and secondary windings including procedures on winding machines. Then it deals with the production of the tank and the final assembly of the transformer into one unit. The next part of the thesis discusses the design procedure of the assigned distribution oil transformer with a numerical calculation while respecting the requirements of the standards. Finally, the costs of the material of the designed transformer are determined.
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Starting Battery
Mach, Martin ; Huzlík, Rostislav (referee) ; Hájek, Vítězslav (advisor)
This bachelor’s thesis describes construction and functioning of starting battery. This thesis is separated to parts as electrochemical current source, possibilities of sorting and characterization of accumulators which are used as starting battery. One part is about constructions of starting battery which are available and description of electrical parameters. Next part includes correct functioning and service. Last part of this thesis describes a project of laboratory exercise containing a measurement on starting battery.
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