Roman Pechanek

Key construction aspects of resonant wireless low power transfer system

The paper discuses an important construction aspects of resonant wireless power transfer (WPT) system for small portable devices. It focuses mainly on key electrical parameters of the systems resonant linkage and its proper construction shape. All presented theoretical presumptions are consequently verified by detailed measurement.

Concept, design and coupled electro-thermal analysis of new hybrid drive vehicle for public transport

The paper deals with a study of new synchronous machine for use in hybrid vehicle. The synchronous machine is projected as permanent magnet synchronous motor with outer rotor embedded into rear rim of a bus. The main target of the study is design of an air self-cooled hub-wheel PMSM from electromagnetic point of view and using finite element analysis of electromagnetic field and thermal distribution. The analysis of losses in permanent magnets is also mentioned.

Design and FEM analyses of an electrically excited automotive synchronous motor

The paper deals with design of an electrically excited automotive synchronous motor and follow-up finite element method analyses. The machine is designed for water cooling of outer cover and enclosed inner air cooling circuit. The paper deals with complete design and analyses of the machine - calculation of losses, ventilation and cooling conditions.

Analyzing of two types water cooling electric motors using computational fluid dynamics

The focus of this work consists in analyzing water flow inside a water cooling electric motor frame. Aiming of work is in the comparison of load losses and the avoidance of hot spots in two types water cooled frames. Total losses of electrical machine were considered as thermal load. Electrical motor is new designed electrically excited synchronous machine for automotive industry. For the development of this work computational fluid dynamics (CFD) was used.

Vibration behaviour of the asynchronous machine magnetic core

This paper deals with the effect of laminations on natural frequencies of asynchronous machine magnetic core. Measurement of natural frequency of stator core is presented. Numerical model and calculation of natural frequency of core is described in next part. Comparison of measurement and mathematical model is discussed.

Basic operating characteristics of wireless power transfer system for small portable devices

Recent research in wireless power transfer using resonant inductive coupling has made a significant progress and reached very high efficiency (usually above 85 %) at large distances. This paper offers a methodology for the basic analysis and prediction of efficiency of the wireless power transfer system for small portable devices. It also gives an overview of operating characteristics of the system for different positions of transmitting and receiving elements. All presented theoretical presumptions are consequently verified by detailed measurement.

Key construction aspects of low frequency wireless power transfer system using parallel resonance

The papers deals with the wireless power transfer (WPT) system using parallel resonance at low frequency. Two different construction arrangements of two-coil resonant system - with and without impedance conversion - are presented. Impedance conversion is carried out via linkage autotransformer. Both systems are consequently measured and the theoretical presumptions are verified.

Benefits of upgrading insulating materials to operating temperature of induction motor

Development of new material contributes to increasing the load of electric machines, while maintaining the dimensions. This article examines the influence of the material properties of the components of induction motor to its warming. The work carried out thermal calculation asynchronous traction motor. The calculation results are verified by measurements on existing machines. These measurements led to define itself the material properties and the boundary conditions. The computational model are used to predict warming of machines, with the use of new insulation materials.

Determination of critical thermal operation for small squirrel cage motor

The thermal design of small squirrel cage machines is a challenge in comparison with the permanent magnets machines of the same frame size. When designing the machine, the calculated temperatures in all parts should be lower than their critical temperatures. This paper aims to perform thermal analysis for different load types in order to achieve a safe thermal design of the motor. The machine under study in paper is induction motor. Basic dimensions of the stator and the frame are based on the permanent magnet motor. Thermal network method was used for thermal analysis of the machines. Practical measurements for comparison and validation of the existing results should be implemented in future. The paper offer useful practical information for a safe thermal design of induction motor. Paper demonstrates how can be new designed induction motor loads without thermal damaged. The practical significance of the paper is beneficial for the designers of induction motor (IM).

Evaluation of different approaches of mathematical modelling of thermal phenomena applied to induction motors

This paper summarizes electro-thermal coupled analysis modeling methods. Two models of influence of temperature-dependent materials on mathematical modelling are presented together with two modelling methods of heat transmission through the air gap. Mathematical models are compared with measurement accomplished on an induction machine available on the market.