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Calculation of the temperature field of an asynchronous motor
Pavlásek, Ondřej ; Mach, Martin (referee) ; Janda, Marcel (advisor)
This bachelor's thesis focuses on thermal calculations of an asynchronous machine. The first part of the thesis addresses the issues related to the asynchronous motor and the occurrence of losses. The next section is dedicated to the thermics of electrical machines, heat, and cooling. Subsequently, a temperature distribution calculation was performed on the TM90-4S motor using the Motorcad program, and these results were compared with measurements on the machine.
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Fault Tolerant Permanent Magnet Synchronous Motor
Vaško, Dávid ; Mach, Martin (referee) ; Vítek, Ondřej (advisor)
This thesis deals with fault-tolerant machines. The first part covers the theory of faults in electrical machines and the possibility of increasing fault tolerance, especially for PMSM. The second part includes the analytical calculation of the main dimensions of the Dual-Three phase Fault-Tolerant surface mounted permanent magnet machine needed to create a RMxprt model. In the third part, the thesis deals with creating a model in ANSYS RMxprt, Maxwell 2D, and Motor-Cad and comparing the results. In the fourth part, the machine was optimized for the highest possible torque density at the highest efficiency and simplified thermal model was built including oil cooling. The fifth part deals with simulations of fault conditions: open circuit and single-phase short circuit. In the sixth part, a motor with interior permanent magnets was designed and simulated under the same fault conditions.
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Acceleration method of measuring electrical machines
Ředina, Ondřej ; Mach, Martin (referee) ; Červinka, Dalibor (advisor)
This thesis deals with the acceleration method of measuring electrical machines. The beginning of the work is dedicated to the description of standard loading methods, the description of the acceleration method and the analysis of losses in the electrical machine. Two speed modulations are selected: linear and sinusoidal. Each modulation requires a different procedure for determining the speed profile parameters. To apply the method, a diagram of the connection of the workplace is drawn and its optimization is carried out. Subsequently, the usability of the oscilloscope card is verified, which ensures the determination of the instantaneous frequency. Before the test itself, the moment of inertia is measured and the parameters of the speed profile are calculated. The acceleration method is supplemented by a full load test for a more detailed comparison of the results. The measured data almost coincide with the predicted values and trends.
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Braking of an induction machine
Mareček, Šimon ; Janda, Marcel (referee) ; Mach, Martin (advisor)
The work is focused on the braking of an induction engine and the risks associated with it. In the first part, there are readers acquainted with the technical parameters of the induction engine, which is used for simulations. The second part focuses on the simulation program Ansys Maxwell and the finite element method. In the third part, there are readers introduced to a general description of the induction machine. The fourth part consists of countercurrent braking. The penultimate part is devoted to dynamic braking. The last part contains a brief introduction to generator braking. The chapters focused on braking are supplemented by simulated waveforms.
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Analysis of single phase induction motor
Vícha, Adam ; Mišinger, Lukáš (referee) ; Mach, Martin (advisor)
The bachelor‘s thesis deals with construction, operation principle, connection method, winding and distribution of losses of induction motors focusing on single-phase induction motors. Two single-phase induction motors with an auxiliary phase and permanently connected capacitator are measured in the laboratory. Each motor is made of different electrotechnical sheets. Motors are subjected to analytical calculation and analyzed by finite element method. Influence of quality of magnetic circuit is researched. Results of analysis are compared to measured readings in the conclusion. Both motors are compared in terms of efficiency.
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Diagnosis sliding contact using practical applications "Methods particulate"
Kopecký, Jiří ; Mach, Martin (referee) ; Veselka, František (advisor)
This thesis deals with the sliding contact of electrical machines and its diagnostic methods. Namely, the dust-particles method for assessing the length decrease of brushes is deeply described. Then, usage of the method in industry is described. The comparison of accuracy between manual version and new automated version of the method using computer analysis is presented. The final section is devoted to the practical verification of the new automated version which was developed especially for large machines. Measurements were performed on a small machine.
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Motors for automotive wipers
Sekerka, Jan ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
This thesis deals with the innovation of DC motors with permanent magnets used in automotive technology to drive wiper mechanism to reduce the volume and weight of the active materials. Potential innovations is mainly using magnets of the magnetic rare earths, such as Neodym or samarium-cobalt. Another option is to reduce the rotor to decreases the number of threads (here, it's all about, what are the requirements for performance). The result is an innovative motor, wherein the volume of the permanent magnets is reduced by 65% and total volume of the motor by 23% while maintaining the rotor parts. Also slightly raised performance with Neodymium permanent magnets.
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Diagnostics of rotating electric machines
Soukup, Patrik ; Mach, Martin (referee) ; Janda, Marcel (advisor)
The thesis Diagnostics of rotating electric machines deals with the theory of diagnostics of rotating machines, focusing especially on the diagnosis of asynchronous motors of high power. Due to the importance of maintaining the trouble-free condition of these machines with regard to serviceability, the importance of their diagnosis is growing. Due to inappropriate working conditions or for many other reasons, different types of malfunctions may occur in the machine. The list and the way of occurrence of possible failures are included and explained in this thesis. With the growing age of the machine, it is important to check the insulation status through insulation testing. These tests are performed in the practical part of the thesis and the results are presented. In the case of asynchronous machines, each anomaly leaves a signature in the form of an electrical, magnetic or vibrational signal. These signals are analyzed and evaluated using a specific measuring equipment with the intention of deciding on the current state of the machine. Motor current signature analysis (MCSA) is considered to be the main diagnostic method of asynchronous machines in this thesis. This method is described in detail in this paper and is being applied in electrical engineering.
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Process a review of the specified electrical equipment
Lanc, Rudolf ; Mach, Martin (referee) ; Veselka, František (advisor)
The revision of the electrical equipment means verifying the state of the equipment concerning its safety. The aim of the Bachelor Thesis is the revision of the selected electrical equipment. The particular equipment will undergo a revision, measurements, supervisions, and tests, which are subject of the norms. A revision report will be issued as a result of the established facts, in which possible failures will be described. Further on eventual risks will be explained and techniques how to eliminate them proposed.
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