Ing. Pavel Mňuk, CSc.

Optimal induction motor control with respect to produce the highest torque with the minimal current is described in this paper. The first theoretical part derives the rotor current frequency at which such aim is reached. The highest torque depends however naturally on machine parameters. Rotor resistance depends on the temperature and rotor inductivity on machine current. The second part describes the laboratory measurements that were performed to specify these influences on a real induction motor.

V příspěvku je řešen problém optimalizace řízení asynchronního motoru s ohledem na minimální odběr proudu potřebného pro vytvoření žádaného momentu. V první části příspěvku je teoreticky odvozena velikost optimálního kmitočtu rotorového proudu pro dosažení popsaného stavu. V další části jsou pak prezentovány experimentální výsledky dokazující dobrou shodu s teoretickými závěry.

This paper presents a system for automated driving cycle simulation and mea- surement for electric vehicles. The system is a part of a laboratory located in VTP Roztoky and is used for electric vehicle powertrain testing. The main part of the control system is dSpace DS1103.

Testing of electric vehicle drives in real traffic conditions is relatively expensive and complicated task. Therefore new laboratory methods, enabling testing and special parameters of electric drives measurement “like in real traffic” are in the looking for. One of most effective methods is based on HIL (Hardware In the Loop) which represents combination of simulation methods and measurements on real drive in the laboratory conditions. For this purposes testing laboratory at Scientific Park VTP Roztoky has been adapted. Laboratory enables automated experiments, provided on the electric drives completed system.

Minimizing of energy consumption is important task which is solved at all vehicles. In the case of electric vehicles (EV), energy stored on board in chemical accumulators must be used very effectively. For this purposes mathematical model of EV and real journey data used for energy consumption calculation must be used. On the basis of journey regime optimization lower energy consumption can be achieved. Optimal journey regime is calculated from the demanded travelling time by means of known road data, obtained by means of GPS and GSM navigation system with the aim to travel with minimum fuel consumption. From the road horizontal and vertical data basic route elements are calculated. Basic route elements are compared with needed torque, generated by driver’s pedal. All this information's are processed, optimized and needed mechanical torque is transmitted to the control unit of electric drive.

System main application area of the system is in automotive techniques based on progressive electric (ED) and hybrid drive (HD) technology. Therefore one of the special laboratories is equipped for electric and hybrid-electric drives measurements. For this purposes laboratory is equipped by electric power supplies and by dynamometric testing bench, which enable complex electric drives parameters measurement. Main topic of this article is to inform about architecture of this laboratory.

In the year 2012 the new SCIENCE AND TECHNOLOGY PARK in Roztoky town has been founded. The place is situated near Prague. Main field of research works is focused onto the automotive techniques based on classical internal combustion engines (ICE) and progressive electric (ED) and hybrid drive (HD) technology. One of the special laboratories is focused for electric and hybrid-electric drives measurement. For this purposes laboratory is equipped by needed electric power supplies and by dynamometric testing bench, which enable: Automated dynamometric measurement of electric machines torque characteristics up to 6000 rev./min. (direct coupling) and up to 12 000 rev./min.(coupling over reduction gearbox); Automated data logging and plotting; Testing of advanced electric energy storages for EV applications (chemical accumulators, super-capacitors of hydrogen fuel cell convertors); Energy recuperation to the power mains.

Main field of research works is focused onto the automotive technique based on classical internal combustion engines (ICE) and progressive electric (ED) and hybrid drive (HD) technology. One of the special laboratories is focused for electric and hybrid-electric drives measurement. This laboratory is quipped by needed electric power supplies and by the 85 kW dynamometric testing bench.

Variable frequency generator with defined frequency shape is presented. Generated signal is used as induction motor speed required value for inverter. Induction motor is part of hybrid car model.

The paper presents method of the additional overheating protection of the crystallizer furnace. Protection is based on the measurement of the electric resistance of the heating windings. Presented overheating protection is part of the scientific facility for space research.

Příspěvek je věnován problematice návrhu a realizaci měřicího systému pro měření účinnosti elektrického děliče výkonu.