
Transmitter and receiver for remote data transmission
Zimčík, Václav ; Toman, Marek (referee) ; Huták, Petr (advisor)
Bachelor thesis is focused on the construction of a multichannel thermometer with wireless data transmission. The device will be able to receive data from multiple transmitters, to which multiple temperature sensors will be connected, to one receiver by wireless transmission at a frequency of 433MHz, and then the device will display this data on a display using selected components and algorithm.


Thermal model of highspeed induction motor
Světlík, Martin ; Mach, Martin (referee) ; Toman, Marek (advisor)
This thesis deals with thermal calculation of highspeed machines. Distribution of electrical rotating machine losses and calculation of mechanical losses in the air gap and on the ends of rotor is described in first part. Based on relationships taking into account rotor friction of the against the surroinding fluid are these calculations make. Literary search on theme of thermal calculation and principle of calculation thermal network method is descript here in the next part. Thermal network designed for specific machine and tabular of resulting temperatures are located in the last part.


Design of synchronous linear motor thermal network
Čech, Jan ; Toman, Marek (referee) ; Knebl, Ladislav (advisor)
The first part of this thesis deals with the study of linear motors. The introduction of the thesis deals with the brief description of the linear motor, including its accessories. This part explains principle of linear motors, their general advantages and disadvantages. The next section contains an overview and division of the currently used linear motors. The second part deals with the theoretical description of forms of heat transfer. The third part of the thesis deals with the design of an equivalent thermal circuit model of a linear ironcore linear motor with permanent magnet. Hereafter, the proposed design will be used to calculate the temperatures of the individual motor units. The temperatures are later compared with the results obtained with finite element method.


Inverter for DC motor 800 W
Němec, Petr ; Toman, Marek (referee) ; Procházka, Petr (advisor)
The goal of this Bachelor´s thesis is design of an power inverter for BDC motor 36 V/800 W with permanent magnets. The first part of this work is devoted to the brief description of drive elements, which with designed converter create drive system. It´s also contain measures of used BDC motor MY1020. In the second part there is a outline description of functions and connection of DC/DC converters with respect to the final solution. The power circuit will be built with the MOSFET IRFP4110 connected to the H bridge. Transducer control logic will be provided by the microcontroller development board Arduino UNO 3 with the integrated driver circuit IR2110.


Dynamic Liion battery model
Loucký, Vojtěch ; Cipín, Radoslav (referee) ; Toman, Marek (advisor)
The main aim of this work is to compare mathematical models of LiIon batteries and for the chosen mathematical model create dynamic model in MATLAB. Different mathematical models are compared based on their weakness. There is detailed description of Improved Thevenin model, which is then created in Simulink and is tested for various discharging currents. This model is adjusted to work with parameters obtained from measuring data on real Liion cell and the results from simulations are compared with results from real measurements.


Construction of a 3D printer
Hanzlíček, Martin ; Toman, Marek (referee) ; Ctibor, Jiří (advisor)
This Bachelor thesis deals with topic 3D printers. Thesis includes overview of base technologies for 3D printing. There is more information about FDM technology, which is used in this project. There are chapters describing all important components and description of electronics drives. The control electronics was made by leader of this Bachelor thesis in his Master thesis. The practical part of this thesis deals with the design of mechanical 3D construction, dimensioning of electric drives, design wiring diagram and realization of 3D printer itself.


Thermal Model of Induction Machine and its Practical Verification
Toman, Marek
This article deals with making of thermal models of electric machines using socalled thermal network. The first part of this article describes reasons why thermal models of electric machine should be used. In the second part the heat transfer basics and thermal network basics are described. The last part is focused on simulation of a thermal network of a specific induction machine and its verification of correct functionality by measurements.


Thermal calculation of electric motor with permanent magnets and squirrel cage
Homolová, Romana ; Bárta, Jan (referee) ; Toman, Marek (advisor)
In the first part, this project deals with the elaboration of a Line Start Permanent Magnet Synchronous Motor. Possible designs of the motor, used magnets and also its function are listed there. The next part of the project summarizes the theory of heat transfer needed to calculate the heating of rotating electric machines. The following section deals with the calculation of the heating of the motor using the method of thermal networks and a specific network for asynchronous motor is presented there. A newly designed rotor network of the Line Start Permanent Magnet Synchronous Motor is based on this network. To verify the functionality of the network, a calculation of the rotor temperature distribution was done in Ansys Workbench program. The designed thermal network of the whole motor and a verification of its functionality with the calculation from Ansys are presented in the last part of the project.


Thermal analysis of a small induction machine
Holcman, Marek ; Toman, Marek (referee) ; Mach, Martin (advisor)
This thesis deals with the thermal analysis of a small asynchronous motor with a power of 600 W. The motor losses were determined first by the program RMxprt, and then by laboratory measurement. Temperatures in engine are calculated using the thermal resistance method. For analytical calculation of motor temperatures, a simple program was created using the Matlab computation program. Using the created program and determined losses, engine temperatures were calculated, which were then verified by measurement.


Operation of induction motor with respect to maximum efficiency
Čech, Jiří ; Ctibor, Jiří (referee) ; Toman, Marek (advisor)
In the first part of this paper a mathematical model of induction motor is described. With usage of network equivalent circuit equations for calculation of individual power losses and overall efficiency are derived. Research study of loss minimization control is introduced in the next part. Several often used methods of variable frequency drive control are described. Also a review of loss minimization techniques from the perspective of induction motor control are presented. The last part of this paper includes a detailed description of scalar induction motor drive focused on reaching optimal efficiency. The loss minimization technique used is a model based method with rotor frequency being the control variable. At the end the performance of this method is verified using a computational script in Matlab.
