| Autor: |
Nizimov, V. B., Kolychev, S. V., Snighko, A. A. |
| Předmět: |
|
| Zdroj: |
Scientific Bulletin of National Mining University; 2013, Issue 5, p72-77, 6p |
| Abstrakt: |
Purpose. To study the synchronous motors starting modes dynamics with nonlinear capacitive energy storage for driving the rotation mechanism with considerable momentum static resistance while limiting the stator and start windings currents. Methodology. To reach the goal we have proposed nonlinear capacitive energy storage. Its parameters vary as a function of slip. This allows to compensate the synchronous motor excitation winding inductance, and by reducing the phase shift between the vectors of the e.m.f. and the current flowing through the coil, to increase the electromagnetic torque generated by it. The checking of the basic theoretical positions was made by numerical modeling methodology. For the research of influence of the nonlinear energy storage we have calculated synchronous motor starting modes by Park-Gorev equations in relative units of the system " xad " Findings. The analysis of the calculated dependence showed that, compared to starting with an additional resistor multiplicity 8Rf , start-up time ????????-2000-100 motor with the proposed non-linear capacitive storage decreased by 20.8% from 1200 r.u. to 950 r.u. Starting torque decreased from 4.8 r.u. to 3 r.u., and the average asynchronous torque increased from 1.6 r.u. to 2.3 r.u. The current in the field winding, connected to the energy storage, reached the value of 6.5 r.u in the beginning of start-up. The average value of the stator current decreased from 6.2 r.u. to 5.8 r.u. Originality. We have proposed the construction of the nonlinear capacitive energy storage, parameters of which depend nonlinearly on the frequency of the current flowing through it, and carried out theoretical studies of its influence on the asynchronous start of synchronous motor. Practical value. The proposed non-linear capacitive energy storage can find its application in the starters for synchronous motors in driving systems of wide range of industrial machinery. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
