Zdenek Cerovsky

Digital controlled high speed synchronous motor

Contribution deals with predictive torque control of the high speed permanent magnet synchronous motor. Such motors are used for electrically driven compressors (E-booster) on turbocharged gasoline or diesel engines. Theory and experimental results from the laboratory are revealed.

Electric power divider of hybrid car propulsion systems

The paper deals with the power splitting synchronous permanent magnet generator used in hybrid electric cars. The synchronous permanent magnet generator is special electric double rotor generator which acts as power divider. This special electric machine concentrates planetary gear and electric generator, known from other solutions, into one special electric double rotor machine. The paper deals with this new machine from the point of view of its efficiency. The usage of this splitter device in hybrid electric drives is described. Important feature of this power splitter is its efficiency. Therefore laboratory measurements were performed. Results and their discussion are presented. Experimental results give very good efficiency of this power splitter in broad range of differential revolution of both rotors. The efficiency lies between 87 and 98 %.

Electric Power Divider in Hybrid Electric Vehicle Powertrain

Paper deals with automotive hybrid and power splitting drives. The system used for laboratory experiments at Czech Technical University in the Josef Bo¿ek Research Center of Engine and Automotive Technology is described and its function explained. Special attention is paid to the electric power divider, which is a synchronous permanent magnet generator with separately rotating stator and rotor. The theory of the divider is derived. The knowledge of qaxis reactance and d-axis reactance is for load characteristics important. A new method how to measure the q-axis synchronous reactance of permanent magnet machines was developed. The method and results are in the paper described.

Dynamic properties of high-speed electrical motor supercharger

This paper presents some specific issues of a high speed permanent magnet synchronous motor control used in a combustion engine supercharger system. A description of a method designed to limit the load angle of synchronous motor in high speed is given. Also experimental results in dynamic states are shown. In these states mainly acceleration times and energy intensity with correlation on motor current and field weakening were examined. Dynamic properties were tested for a power supply with both high and low internal resistance. The experimental setup description is given and test results for speed up to 42 000 RPM are shown.

Experimental research of high-speed electrical motor supercharger dynamic properties

This paper presents some specific issues of a high speed permanent magnet synchronous motor control used in a combustion engine supercharger system. A description of a method designed to limit the load angle of synchronous motor in high speed is given. Also experimental results in dynamic states are shown. In these states mainly acceleration times and energy intensity with correlation on motor current and field weakening were examined. Dynamic properties were tested for a power supply with both high and low internal resistance. The experimental setup description is given and test results for speed up to 42 000 RPM are shown.

A new pulse power converter for a hybrid-electric drive stand

This paper describes scheduled modernization of the laboratory working stand for a hybrid-electric drive. This paper describes the existing hybrid electric drive model and analyses previous research done by our department in the function of hybrid engines. Thereinafter, some defects in the current circuit are described. The last part of this paper describes the design of a new converter, which should correct these defects.

Sinteza upravljanja i optimizacija frekvencije sklapanja DC/DC frekvencijskog pretvarača za superkondenzator

The article discusses design of mathematical model buck and boost converter and the analysis of the optimal frequency choice of the PWM signal for IGBT. The converter is dedicated for charging and discharging of hybrid car drive super-capacitor energy storage. The main role of the converter is to optimize energy content in super-capacitor storage used to acceleration and deceleration during driving period. Mathematical model of the system in MATLAB/Simulink and converter prototype with Freescale Digital Signal Processor 56F8257 were designed. Comparing of simulation results and results measured on the prototype are discussed on the end of the article.

Pulse rectifier control for electric power splitter of a hybrid propulsion system

This paper presents a control structure proposal for output voltage control of a pulse rectifier powered from an electric power splitter with permanent magnets. This system is intended to be used in hybrid vehicles. Specific problems in this area are primarily the necessity to work in a broad range of output voltage frequencies, to provide power splitter output power limitations and to provide a significant output DC voltage boost. The control structure covers up both the full magnetic flux mode and the magnetic flux weakening mode as well. We present the experimental setup and experimental results obtained on a system with electric power splitter - pulse rectified - load.

Electric power splitter pulse rectifier control in a hybrid propulsion system

This paper presents a control structure proposal for output voltage control of a pulse rectifier powered from an electric power splitter with permanent magnets. This system is intended to be used in hybrid vehicles. Specific problems in this area are primarily the necessity to work in a broad range of output voltage frequencies, to provide power splitter output power limitations and to provide a significant DC output voltage increase. The control structure covers up both the full magnetic flux mode and the magnetic flux weakening mode as well. The experimental setup and experimental results obtained on a system with electric power splitter - pulse rectified - load are presented.

THE INFLUENCE OF THE INDUCTION MOTOR VELOCITY ON THE TRANSIENT PHENOMENA

ABSTRACT The paper deals with transient phenomena of an induction motor caused by a voltage pulse at different angular velocities. The response of the machine varies according to the angular velocity. The dependence of the time constants on the angular velocity has been derived. The response can be an exponential one or aperiodically damped. The reasons why the electromagnetic transient phenomenon of an asynchronous motor at standstill lasts longer than while revolving are explained. Per Unit System and space vectors are used.