SVIBOR - Papers quoted in CC - project code: 2-05-255
### MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB

tel.: +385 1 459 44 44, fax: +385 1 459 44 69

E-mail: ured@znanost.hr

## SVIBOR - Collecting Data on Projects in Croatia

### Papers quoted in *Current Contents* on project 2-05-255

**Quoted** papers: 2

**Other** papers: 81

**Total: 83**

**Title:** Main pole covering and magnetic flux density distribution
for the D.C. machine with double lap unsymmetrical armature winding

**Authors:**
- Gašparac, Ivan (75402)

**Journal**: Automatika

**Number**: 1-2

**ISSN**: 0005-1144

**Volume**: 35

**Year**: 1994

**Pages**: from 11 to 16

**Number of references**: 5

**Language**: hrvatski

**Summary**: The influence of the tangential shifting of the half of the
main pole shoe on pulsations of the voltage among adjacent commutator bars
for the double lap unsymmetrical armature winding is presented. The concept
of voltage-free zone is introduced, as well the way for its determining.
The necessity of the reduction of the main pole covering if the double lap
winding with shifting of the half of the main pole shoe is used in
comparison with the usagee of the single lap winding without shifting is
poited out. The method is established and the voltage among commutator bars
of the large DC machine has been recorded. Volume magnetic flux density
distribution is estimated from the recording nondiametrical coil voltage
and the voltages among adjacent commutator bars are calculated and compared
with the recorded ones. This confirms numerical methods for determination
of voltage among adjacent commutator bars.

**Keywords**: voltage free-zone, DC machine, voltage among kommutator bars, nondiametrical coil voltage, shifting of the half of the main pole shoe, main pole covering, volume magnetic flux density distribution

**Title:** Speed estimation method in vector controlled induction
machine drive without shaft encoder

**Authors:**
- Zdenković, Josip (185145)
- Kuljić, Zoran
- Čanić, Šimun
- Klobučar, Veljko
- Perkovac, Milan

**Journal**: Automatika

**Number**: 3-4

**ISSN**: 0005-1144

**Volume**: 34

**Year**: 1993

**Pages**: from 87 to 92

**Language**: hrvatski

**Summary**: In order to improve the robustness of vector controlled
induction machine drive the direct speed measurement should not be applied.
The aim of this paper is to present one method for indirect speed
estimation, which permits to estimate speed from stator voltage equation in
field coordinates with presumptions that rotor flux vector magnitude is
held constant and total leakage factor considered to be zero. Method is
applied in the indirect field orientation structure. Simulation results
show that good behaviour is obtained in steady state condition under load
and dynamic condition under stepwise speed and load reference changes,
regardless even if some error exists in assumed values for stator and rotor
resistance.

**Keywords**: vector control, induction machine, digital signal processor, speed estimation

Information: svibor@znanost.hr