This dissertation thesis deals with wireless power transfer technology - its appropriate application in passenger and public electro-mobility, thus in areas of high transferred powers and large distances. This thesis capture actual trends with overlap to the cable charging stations and direc...

A thermal model to accurately estimate the junction temperature of inverters is developed. State of the art methods for determining thermal impedance networks for IGBT modules are used in the establishment of the relationship between the measured transistor or diode voltage and temperat...

Tato práce se zabývá analýzou a návrhem řídicích algoritmů měniče pracujícího do zátěže napájené ze dvou nezávislých zdrojů (např. otevřené statorové vinutí), tzv. duálního měniče. Je zaměřená na algoritmy řízení umožňující zvýšení výkonové hustoty. Toho je dosaženo pomocí navýšení přenášeného vý...

Electromagnetic noise is an acoustic noise radiated from an electric drive due to electromagnetic forces and vibrations in electric machines and other parts of the electric drive. Using of inverter in modern electric drives brings additional frequency components into voltage, current and...

This doctoral thesis is focused on the impact of machine design on warming and features of synchronous machines with permanent magnets. The chapters present the current state of the art of the thermal calculations of electric machines, examples of solutions based on the selected&#x...

This dissertation thesis deals with power converters for special applications using modern semiconductor devices. Main target of this thesis is to design power converters for three different projects with unique requirements. First power converter variant is designed for automotive field an...

The presented PhD thesis introduces the proposed topology of traction drive composed of several separate cells of the power traction converter. This work describes modular topology of traction converter with medium-frequency transformer using matrix converter and voltage-source active rectifier. The&#...

The thesis brings a comprehensive view on the issue of winding interaction with magnetic circuit of permanent magnet synchronous machines. In addition to the mathematical description of the winding magnetomotive force, the thesis is focused on the development of own methods for the ...

Submited theses deals with ventilation - thermal analysis of the air-cooled powergenerator. In several chapters, there is description of the current situation, goals of the dissertation thesis and the aproach. The chapter, which deals with the aproach, describes importance of the heat r...

This work deals with modern concepts of electric drives for medium and high power (megawatt range), particularly with electro-mechanical interaction between frequency converter, electric motor and mechanical shaft system. First the motor torque and its ripple is analyzed, i.e. the pul-sating ...

The thesis deals with stator vibrations excited by the magnetic forces originating in the induction machines. It is referenced the current state of the examined issues including theoretical description of the flux density distribution along the air gap and resulting magnetic forces acti...

This thesis deals with the development of model predictive control of ac electric drives with long prediction horizons and yet with computational cost of the algorithm comparable to conventional cascade control approaches. The basic idea is to approximate the cost to go function of...

This thesis is focused on the development of high-efficiency power electronics converters especially in the field of light traction applications. Primarily, it deals with the auxiliary drives of trolleybuses and with the wireless charging system for electric vehicles. The first part describe...

This thesis deals with DC link harmonics influence on traction drives stability. Stability of traction drive is assessed from frequency characteristics of traction drives, which mean dependences of magnitudes and phases of excited oscillations on magnitudes and frequencies of exciting oscillation...

This dissertation deals with the problematics of multilevel converter control. The designed control algorithm has to be able to select such switching combination, which secures proper output voltage control and balancing of the voltage on single components of the converter, if required. ...

This thesis deals with vibrations and their association with adverse noise effects. Specifically, the work is focused on determining the modal parameters of stator system of small asynchronous machines. The first part describes briefly the general sources of vibrations that may occur in...

The doctoral thesis features the issue of modeling, control and parameter identification of the salient pole synchronous motors. The synchronous motor with permanent magnets on the rotor (IPMSM) and classical synchronous motor with wound salient pole rotor (WRSM) are investigated. The ...

This doctoral thesis is focused on the issue of multilevel converter control and using FPGA for computationally intensive algorithms for motor control. The implementation of these tasks is closely related to an appropriate control hardware - the microprocessor (digital) controller. In the&#x...

This work deals with the reduction of the traction equipment. Weight reduction is achieved here using medium?frequency traction transformer instead of the conventional 50 Hz (16.7 Hz) traction transformer. Medium?frequency transformer is several minor then conventional, but it requires increasing the ...

This dissertation thesis deals with the suitable power management strategies of the energy storage system in vehicles with enhanced energy efficiency. The thesis describes the tram simulation model running on the line no. 4 in Pilsen. The simulation model was created by using the&#...