Repository logo

Browsing by Subject "voltage frequency converter"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Przemienniki częstotliwości w napędach jazdy gąsienicowych maszyn górniczych i węglowych przenośników taśmowych o regulowanej prędkości taśmy
    (2007) Kasztelewicz, Zbigniew; Reizer, Ryszard; Szymański, Jerzy; Świderski, Jerzy
    In the paper modern drive solutions of mobile conveyor belts, caterpillar excavators and spills for surface brown coal mine as well as control methods of systems are presented. In classic drive solutions DC motors were used. Nowadays DC motors are replaced by AC motors. AC motor drives are controlled by advanced frequency converters in which scalar and vector control strategies are implemented. Power electronic recuperation units are used for power saving. Recuperation units return electrical energy to the power grid when the induction motors work as generators. The solution of the multi-motor drive system is discussed on the basis of the biggest brown coal excavator in Poland.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Przenośniki węglowe o regulowanej prędkości taśmy. Aspekty techniczne i ekonomiczne
    (Wydawnictwa AGH, 2009) Szymański, Jerzy
    Nowadays surface lignite mobile conveyor belts used about 10% of total mine electrical energy. About 50% of these energy consumption is possible to save by usage a new techniques in solution of conveyor belts electrical drive. The most important feature is belt speed regulation of coal conveyors. A mass transportation is always a very costly and these processes must particularly be inspected to reduction energy consumption. As annual lignite production in Poland is about 62 mln ton it is important climatic feature too. World wide companies offers of low voltage frequency converters with power up 1MW, which have a good price and reliability. These frequency converters need to be commonly used to build drives of coal conveyors with speed belt regulation.