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Effect of Manufacturing Variations of Permanent Magnets in Surface-Mounted Permanent Magnet Motors
Vícha, Adam ; Mach, Martin (referee) ; Bárta, Jan (advisor)
Master’s thesis summs up issues of mounting pemanent magnets on rotor surface of permanent magnet synchronous machine. Literature reseach is divided in two parts. First one shows studies and experiments researching the impact of manufacturing tolerances of permanent magnets and wrong mounting on the rotor on cogging torque . The second part focus on analytical aproach of defining influence of permanent magnets on magnetic flux density in the air gap and phase induced voltage. Practical part focus on design of a prototype machine, wich will be used to research the impact of tolerances and imperfections. Parametric model of the prototype machine is created in Maxwell and is subjected to analysis via finite element method. Three different analysis were run, offset of permanent magnet, decrease and wrong dicertion of magnetization. At last the result of cogging torque and induced voltage are compared.
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Loss-of-excitation Protection for Synchronous Generator
Čáslava, Jiří ; Geschwinder, Lukáš (referee) ; Orságová, Jaroslava (advisor)
The aim of this work is to create a theoretical analysis of the problem of the exciting and de/exciting systems of synchronous alternators, an analysis of their functions and the problem of their disturbances, in connection with this being the following analysis of the asynchronous operation of the generator which appears with a big drop or with total loss of excitation. Further, it is necessary to carry out an analysis of the marginal loading and of the transient phenomena during the loss of excitation with the following summary of the knowledge and of the possibilities of the excitation loss diagnosis. The next task is to get acquainted with the possibilities how to protect machine protection terminal REM 543 produced by the ABB company, as well as with their following configuration and testing, for which we use the testing equipment of the protections TZO 3 produced by EGÚ Brno company. The primary goal of this work is to create a detailed direction for the calculation of the parameters necessary to put up the protection function UE6High of the REM 543 terminal, further to create the configuration of the protection communication and of the TZO 3 test device with PC, as well as to put up the REM 543 terminal including the putting up of the test TZO 3 device. The UE6High function works on the principle of the distance protection which is the most extended and the most effective to detect the loss of the synchronous alternator excitement. By means of the calculated values we carry out the putting up in order to pull out the MHO characteristic on the impedance level. The work also contains the measured values of the switch characteristic on the impedance level for various putting up of the rapidity of change of the excitement working quantities like voltage, current and phase shift measured within all three phases.
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Vector Control of Synchronous Machine
Rajchman, Zbyněk ; Pazdera, Ivo (referee) ; Aboelhassan, Mustafa Osman Elrayah (advisor)
The aim of this thesis is to describe the mathematical model of a permanent magnet synchronous motor (PMSM) using (d-q axis). The d-q model of the PMSM has been developed on rotor reference frame, it is done by converting the three phase voltages an currents to dq variables by using Parks transformation. The mathematical model of PMSM has been verified and designed in MATLAB-SIMULINK.
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Magnetic field analysis of synchronous machine
Volf, Tomáš ; Janda, Marcel (referee) ; Skalka, Miroslav (advisor)
The Magnetic Field Analysis Project of Synchronous Machine deals with program for magnetic field analysis of synchronous machine cross section. This program is written in detail along with the necessary theory of synchronous machine and the ANSYS program. After this the program for using different types of sectional wires modification is made – in the concrete for round conductors. It is attained the numeric computing method – The Finite Element Method. To creation of the magnetic field simulation serves ANSYS program, which uses The Finite Element Method.
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Short circuit current of synchronous generator
Šebesta, Ondřej ; Orságová, Jaroslava (referee) ; Toman, Petr (advisor)
The thesis deals with the problematics of short-circuit current of synchronous machine. The first section focuses on the theoretical process of short-circuit current of synchronous machine and describes how this transient process changes throughout it's duration and with what reactances and time constants it is defined. Subsequently, this section deals with the methodics of tests of the snychronous machine,which may be used to set it's reactances. The second part of the work focuses on measurement of the short-circuit current in a specific synchronous machine. Further, there are measurements of processes of the short-circuit in time and their analysis. The last section of the thesis deals with the simulation of short-circuit current process. The simulation is ran by the Matlab/Simulink software. Simulated processes of short-circuit are then compared with the results of measurements from the previous section of the thesis.
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Auxiliary winding supplying the voltage regulator of synchronous generator
Hrtáň, Michal ; Hájek, Vítězslav (referee) ; Vítek, Ondřej (advisor)
The theme of this thesis is the design and verification of the auxiliary winding to supply the voltage regulator of the synchronous generator. The synchronous generator for which the auxiliary winding proposed is three-phase, low voltage with double layer random wound stator winding. The generator excitation is brushless with auxiliary rotating exciter. The auxiliary winding is designed for placement in the stator teeth, along with the main winding. The sizing of the auxiliary winding is derived from the power requirements the voltage regulator. Draft winding is validated analytical calculation and finite element method (FEM). The auxiliary winding has been implemented in the production of the generator. The Features of the auxiliary winding have been verified by measuring the by electrical testing room and the test results are evaluated.
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Analysis of field current in synchronous machines
Kocman, Roman ; Mach, Martin (referee) ; Veselka, František (advisor)
This master’s thesis is focused on the analysis of the excitation current in synchronnous machines. Contains a description of excitation systems for synchronous machines, meaning and design of the sliding contact ant its representation in electrical machines. The main part of the work is focused on the evaluation of the field current of the three plants. The work includes graphic record of the excitation current of the hydroelectric power station Slapy, provided record from the power plant Opatovice was for evaluating load of turbo-generators. Provided record from the nuclear power plant Temelín was for evaluating.current division into individual brushes. The conclusion is a summary of the achieved knowledge.
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Analysis of thermal properties of the synchronous machine
Paszek, Michal ; Hájek, Vítězslav (referee) ; Janda, Marcel (advisor)
In this Master´s thesis will be performed an analysis of thermal properties of synchronous machines in the program Ansys Workbench on a simplified model of synchronous traction motor. In the first section will be performed thermal analysis without cooling followed by analysis of air flow and finally thermal analysis with cooling for fan speed 1500 min-1 and 3000 min-1. The second section will describe the principle, construction and losses on the synchronous machine. The third chapter will describe concepts such as heat, temperature, heat transfer, types of the heat transfer, specific heat capacity, emisivity and thermal conductivity. The fourth chapter will introduce the program Ansys Workbench, finite element method and Ansys CFX. In the fifth chapter will be described how to perform thermal analysis on the created model of motor. The sixth chapter will describe how to analyze the air flow of the created model of motor. The flow analysis will be performed for fan speed 1500 min-1 and 3000 min-1. In the seventh chapter will be compared the results of the air flow and pressure field in the motor model. In the eighth chapter will be performed a thermal analyzis on the created motor model with cooling for fan speed 1500 min-1 and 3000 min-1. The nineth chapter will compare the results of temperatures and heat fluxes obtained from the thermal analysis witnout cooling, with cooling for fan speed 1500 min-1 and 3000 min-1 for full losses, half losses of continous running, and full losses of interrupt running for 9000 seconds (2 hours 30 minutes).
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Ventilation calculations in synchronous machine
Judas, Jan ; Deeb, Ramia (referee) ; Janda, Marcel (advisor)
The aim of the project was to get familiar with the environment of ANSYS CFX, create several models of fans and synchronous machine model in Autodesk inventor, create model of cooling medium flow through the machine with these fans and evaluation of results. Firstly the thesis describes the synchronous machine itself, losses of the machine, the flow of power of synchronous machine and methods of its cooling. Next the thesis describes each kind of heat transfer, laminar and turbulent flow. The thesis also refers of kind of the fans and the program used to calculate the flow Ansys CFX, including the method that Ansys used to calculate. The work describes the individual modification of fans and setting of calculation in ANSYS. Then displays the results of the analysis these fans for different numbers of fan blades and for modification of the fan. Then the thesis analyzes selected modifications due to changing speed. In the last chapter shows the analysis of flow in the machine with three different fans. In particular, there is shown the mass flow rate, pressure and its distribution on areas for evaluation.
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