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Losses Analysis of Induction Machines with Small Output Power
Mach, Martin ; Záskalický, Pavel (referee) ; Voženílek, Petr (referee) ; Hájek, Vítězslav (advisor)
The main objects of this doctoral thesis are analysis of a small induction motor losses and research of ways how to reduce losses and increase efficiency of this motor. The ways how to reduce losses and increase efficiency under study are as follow: reduction of stator winding’s resistance, lengthening of magnetic circuit, modification of turn number, cooper squirrel cage, slots shape optimization, sheets annealing and use of sheets with lower specific losses. The losses analysis and the research of ways how to reduce losses are done due to laboratory work. For this laboratory work, eleven different samples of the motor with above mentioned modifications were manufactured. Results of their measurements and losses analysis are presented in this thesis. There were also simulations by finite elements method used to help solve objects of this thesis. Due to the simulations, analysis of loses of the induction motor under study was done. Results of this analysis include some details that are not included in the results from measurement, for example separation of core losses between rotor and stator. The simulations were also used for analysis of manufacturing technology impact onto the motor’s performance. During this analysis, following impacts were considered: actual shape of magnetic circuit, stator’s sheets riveting, influence of cutting onto material’s properties and placement of the stator into conductive frame. Results of this analysis are presented in this thesis.
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Thermal properties of electric machine
Buřil, Pavel ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This bachleor's thesis is dealing with choosing of right consecution for simulation of thermal attributes (propagation of heat) in electrical machines. In next part, there is descripted redraw of the real model of machine with using FEM and following simulation in Ansys Workbench development environment. Base was the real measurement of asynchronous motor. In detail shows today's usual methods of development in similar problematics. Purpose of tihs Bachleor's thesis is to serwe as a study aid.
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Intelligent Test Procedures Low-Tension Traction Drives with Induction Motors
Nesvadba, Martin ; Ondrůšek, Čestmír (referee) ; Novák, Jaroslav (referee) ; Duroň,, Jiří (referee) ; Singule, Vladislav (advisor)
This dissertation thesis is focused on the problem of the noise measurement and construction of the noise test station what was also interest of my employer - company Kollmorgen,sr.o. This testing station should be located directly in the assembly line with target of the noise motor s identification. On base of these measured values and implemented intelligent testing procedures, we should be able to identify real root cause of the noise The noise of electrical machines is actual issue. There is a big pressure for low-noise driving system construction created by many end-customers. We can achieve these requirements with 100% quality of all parts of current product, implementation of noise testing station and also with design optimization of the current product. Basic testing procedures of induction motors were showed in first part of this work (chapter 4.1.). These procedures are able to provide good picture of the motor condition. For the motor noise measurements was constructed a workplace including noise box with acoustical absorption up to 30dB what allowed the workplace implementation directly into the motor assembly line. Testing techniques and frequency analysis procedures were implemented sequentially with the target of the test evaluation improvement. After the detailed analyze of the motor noise root causes was performed check of the current motor design with respect of the “noiselessness” motor construction principles. As next step was created the motor prototype with optimized construction with target of the motor noise reduction. This optimized motor was tested and compared with standard motor design.
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Modern Mathematical Methods of the Analysis and Synthesis of AC Machines
Cipín, Radoslav ; Skala,, Bohumil (referee) ; Richter, Aleš (referee) ; Patočka, Miroslav (advisor)
The doctoral thesis is divided into three main parts with a focus on induction motors. The first part deals with the electromagnetic design and analysis of windings of AC ma-chines. There is introduced the density of conductors, which describes the distribution of the windings in the slots. There is derived general formula for calculation of the total winding factor applicable to any type of winding. The second part of this work deals with the acceleration method of the induction motors torque-speed characteristics measurement. The measured characteristics are used for exact identification of the equivalent circuit parameters of induction motor. The third section is focused on a very precise identification of the equivalent circuit parameters of induction motor in the form of -circuit. The identification is based on mutual comparison of measured and calculated torque-speed and current-speed characteristics.
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The implementation of AC induction motor control algorithms in DSP 56F8xxx
Jenča, Pavol ; Veselý, Ivo (referee) ; Blaha, Petr (advisor)
In this bachelor’s thesis a control algorithms for induction motors are solved using the methods PDSFC and DTC. Functional algorithms are developed in C and assembly language and are transferred from Simulink to a digital signal processor series 56F8xxx of Freescale corporation. The thesis describes induction motors, used control methods, control schemes developed in Simulink, control algorithms in C and assembly language for each block of created schemes and comparation of simulated solutions.
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Automotive Electric Motors Innovation
Šimko, František ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
The purpose of this project is to explain the construction of motors in car technology. We can acquaint more with the construction of a DC electric motor. Then we will deal more with electric motor starters, an innovation of a DC electric motor or with its replacing for AC electric motor with other poles.
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Calculation of the optimum slip frequency with respect to the minimum losses of an induction motor
Prudík, Martin ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
A mathematical model describing the calculation of the optimal slip frequency of an Induction Motor with squirrel-cage is proposed in this work. The derivation is done using a replace -network, and is designed for a wide range of speeds and torque. The requested torque, speed and constants of replacement network are the inputs of the optimization. Optimum slip frequency and corresponding line voltage are the outputs of this optimization. The results of the calcullations are presented using two asynchronous machines for different speed and torque.
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Thermal properties of electric machine
Buřil, Pavel ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This bachleor's thesis is dealing with choosing of right consecution for simulation of thermal attributes (propagation of heat) in electrical machines. In next part, there is descripted redraw of the real model of machine with using FEM and following simulation in Ansys Workbench development environment. Base was the real measurement of asynchronous motor. In detail shows today's usual methods of development in similar problematics. Purpose of tihs Bachleor's thesis is to serwe as a study aid.
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