Ing. Jan Bradna

The algorithms based on separated control of the motor flux and torque are used in order to gain the maximum performance from the induction machine. To push the efficiency and dynamics limits of the IM to its limits mostly FOC or DTC control strategies are used. Both are based on the knowledge of the hardly measurable variable-machine flux. To obtain the information about inner machine flux models based on the machine equivalent circuit are mostly used. Therefore the accuracy of the equivalent circuits has direct influence on the accuracy of the machine control. To reduce the complexity of the mathematical model the resistances and inductances are concentrated to one component and 3 phase winding is assumed to be symmetrical. In order to design control strategy for the induction motor, system equations and equivalent circuit must be established at first. This paper examines and compares some of the issues of adequate machine modeling and attempts to provide a firmer basis for selection of an appropriate model and to confirm or disprove the equivalence of different approaches. The results of the IM model run up are then compared to the results obtained from the measurements on the real machine and the equivalency is discussed.

This article describes the first part of computer system"Omega 2011", which supports the measuring of inductionmotors. Computer system is related to an automated system formeasuring and data acquisition. Evaluation of data is realized byusing the induction squirrel cage motor, which is modeled afterthe equivalent circuit principle. When calculating the equivalentcircuit for induction squirrel cage motor nonlinear effects oftemperature, power supply voltage and frequency are respected.With respect to nonlinear parameters we can more accuratelyobtain a description of the induction motor by defining thecharacters required for the operational mode.

This paper deals with the projecting a realization of electric motor for the formula type car drive. In the first part you can find basic information about a car with the same concept and motor which has been implemented. Second part of this paper includes information about measurements that have been done on this brushless DC (BLDC) motor. It describes methods of measurements. In this paper you can find characteristics and their comparison with propose values. At the end the paper occupies with possible future analysis of this motor.

TheCTUwas establishedelectricvehicle, of theBuggyas a pilotprojectfor the development ofelectricvehicleswith electricdifferential,where eachaxisdriven byan electric motorpoweredwith its owninverter.Duringtestrunswas designedalgorithm fortorque controlof independentdrives.

This paper deals with the projecting a realization of electric motor for the formula type car drive. In the first part you can find basic information about a car with the same concept and motor which has been implemented. Second part of this paper includes information about measurements that have been done on this brushless DC (BLDC) motor. It describes methods of measurements. In this paper you can find characteristics and their comparison with propose values. At the end the paper occupies with possible future analysis of this motor.

This paper describes the light electric vehicle called "Electro-buggy", that was built at the Department of Electric Drives and Traction FEE CTU in Prague. The most part of the paper is focused at its electric equipment.At the end the paper occupies with possible future ways for analysis of this electrobuggy.

The CTU has established electric vehicle, of the Buggy as a pilot projectfor the development of electric vehicles with electric differential, where each axis driven by an electric motor powered with its own inverter. During test runs was designed algorithm for torque control of independent drives. During the test drives were tested EMC electric vehicle traction drives.

Presented paper describes advantages and disadvantages of possible electric traction drives, that could be used at light electric vehicle. The second part describes conditions and results of the measurement of efficinecy realized on permanent magnet synchronous motor drive, that has be used in light electric vehicle realised at the Department of Electric Drives and Traction.

Design and implementation of small-road vehicles and electric power differential. The rover type BUGGY was designed, manufactured and tested electric motor. Electric project is aimed for the development of electric racing car class student formula-Electric ". In this project we cooperate with the Faculty of Mechanical Engineering, where he formed a group of students and younger teachers who are involved in Formula Student competitions worldwide.

Design and implementation of small-road vehicles and electric power differential. The rover type BUGGY was designed, manufactured and tested electric motor. Electric project is aimed for the development of electric racing car class student formula-Electric ". In this project we cooperate with the Faculty of Mechanical Engineering, where he formed a group of students and younger teachers who are involved in Formula Student competitions worldwide.

The paper consists of two parts. In the first part are described advantages and disadvantages of possible electric drives used at light electric vehicles. In the second part is described the measurement did on PMSM electrical drive used on light electric vehicle built at Department of Electric Drives and Traction. At the end, the results of the measurement are compared with the specifications told by the drive producer.

This paper deals basic information about experimental crystallizer and problems with perturbation vibrations. Perturbation vibrations have negative effect on high-temperature material processing in experimental crystallizer. The sources of perturbation vibrations are described in second chapter. One of the main sources of perturbation vibrations is the movement of the astronauts inside station. .In third chapter we can find the magnets' mounting model. There is described an experimental workplace in the last chapter.

This paper deals basic information about experimental crystallizer and problems with perturbation vibrations. Perturbation vibrations have negative effect on high-temperature material processing in experimental crystallizer. The sources of perturbation vibrations are described in second chapter. One of the main sources of perturbation vibrations is the movement of the astronauts inside station. .In third chapter we can find the magnets' mounting model. There is described an experimental workplace in the last chapter.

Special Electromagnetic Drive for Vibrations Damping of Experimental Crystallizer in Microgravity

Presented basic information about experimental crystallizer and problems with perturbation vibrations. Perturbation vibrations have negative effect on high-temperature material processing in experimental crystallizer. The sources of perturbation vibrations are described in second chapter. One of the main sources of perturbation vibrations is the movement of the astronauts inside station. They are calculations of space station acceleration caused by astronauts movements listed in this chapter .In last chapter we can find the magnets' mounting model.

Presented basic problems to be solved if vibration damping will be neccesary in high temperature material processing in the Earth orbital station.