Trough research work, many devices and laboratory models have been developed in the Laboratory, and used for further experimental research, and verification of new ideas in the field of drives and control of electrical drives.
On this prototype, a well known problem of operation stability of drive with
current frequency converter and induction motor was analyzed. Analyses of scalar
control algorithms were performed with an intention to overcome the
problem of overvoltage during transients. Upgrade of ÁP based control subsystem,
made possible to investigate and develop original algorithm for field control of
drive with current converter and induction motor. Algorithm for direct torque
control of induction motor supplied from current inverter is currently
Control system realized by combining analog and digital technique enabled
research in the field of control techniques of a drive with wide speed range. On
this device, the original solution for adaptive controller (β-controller),
suitable for implementation in nonlinear systems was tested.
An original module (Europe format card), suitable for drive control both in
research and industrial application, was developed on the base of 16 - bit
The device is primarily designed for education, but can be used for research,
too. On this device, the algorithm for induction motor speed sensorless control
with only one current sensor was tested and verified.
On the base of ÁP module, a device for complete control of thyristor rectifier
was developed and tested. UUSTI can be modified for individual control of mono
phase and three phase bridge rectifier, but also when two rectifiers operate in
antiparallel connection. Current, speed, position or some of process variables
controllers are incorporated in the device. UUSTI is primarily designed for
electrical drives, either for realization of new ones, or for revitalization of
existing. Also, it is possible to use this device for thyristor rectifiers of
other purpose, like battery chargers and dischargers, electrolyses,
uninterruptible supply system, etc. UUSTI is developed within the
Innovation project financed from the Ministry of science and technology of
Transistor two-quadrate current driven chopper, with original robust solution
for transistor drivers. Suitable for middle power DC drives, which require high
control accuracy, with specially high dynamic performances.
In the period between 1997. and 2001., investigations and developing of
converter for drives that should enable operation with unity power factor, with
sinusoidal supplying current and possible recuperation, were performed. Within
the research, a current driven rectifier was developed, which incorporated in
the converter for electrical drives provides above mentioned characteristics.
Prototypes of converters for DC motor and induction motor drives were realized.
Within the research, algorithms for control of electrical drives operation
according to minimum power criteria were developed. These researches were
financed within the Strategic technological project with the support of Ministry
for science and technology of Republic Serbia.
Four-channel system for precise, simultaneous speed measurement in multi-motor
electrical drives. The device connected with PC provide speed monitoring in long
time intervals. Developed software enables analyses of results which can be used
for checking of synchronization of several drives, balance of drive
mechanical parts, with the accurate detection of misbalanced parts.
On this model, which consists of two induction motors mechanically coupled,
algorithms for the control of multi-motor drive supplied from frequency
converters are tested. Till now, possibilities for the control of load
distribution in the case of coupled motors are investigated.