Model električnega pogonskega sistema za določanje izkoristkov industrijskih pogonov

ZUPANČIČ, GAŠPER (author), Fišer, Rastko (mentor)

V magistrski nalogi je predstavljena metoda določanja izkoristkov električnih pogonskih sistemov (EPS), ki obratujejo s spremenljivo vrtilno hitrostjo. Metoda temelji na podatkih o izmerjenih delovnih točkah na obstoječem EPS, za katerega je predvidena posodobitev. Analizirali smo EPS, ki skrbi za hlajenje tehnološke vode v industrijskem procesu. EPS je sestavljen iz električnega motorja, centrifugalne črpalke in frekvenčnega pretvornika. Podana je analiza sistema, kjer bodo stari gradniki EPS zamenjani s sodobnejšimi in optimalno dimenzioniranimi gradniki pogonskega sistema. Na vhodu EPS so bili z analizatorjem moči merjeni električni parametri (frekvenca, napetost, tok, moč), na izhodu EPS pa hidravlični parametri (tlak, pretok) merjeni z diferenčnim merilnikom tlaka in ultrazvočnim merilnikom pretoka. Na osnovi meritev sta bila prek razmerja hidravlične in električne moči izračunana izkoristek EPS in količina porabljene električne energije. Prikazan je postopek modeliranja karakteristik izkoristka za posamezne gradnike EPS v več različnih kombinacijah glede na obratovalne zahteve. Primerjali smo učinkovitost električnih motorjev različnih moči in razredov učinkovitosti vodenih s frekvenčnim pretvornikom in obremenjenih s centrifugalnima črpalkama različnih premerov. Podana in ovrednotena je primerjava učinkovitosti novih kombinacij EPS ter finančni prihranek v primerjavi s starim, obstoječim sistemom.

• Language: Slovenian
• Keywords: električni pogonski sistem, izkoristek, motor, črpalka, električna energija, moč
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2020
• PID: 20.500.12556/RUL-120067
• Publication date in RUL: 15.09.2020

Secondary language

• Language: English
• Title: Model of electrical drive system for determination of industrial drives efficiency

Abstract

In the Master thesis a method for determining the efficiency of an electric drive system (EDS) operating with variable speed is presented. The method is based on data of operating points measured on existing EDS, which needs modernization due to low efficiency. EDS, which provides cooling water in an industrial process, was analysed. EDS consists of an electric motor, a centrifugal pump, and a frequency converter. An analysis of the system is given, where the existing components of EDS will be replaced with new and optimally dimensioned ones. At the EDS input, electrical parameters (frequency, voltage, current, power) were measured with a power analyser, and at the EDS output, hydraulic parameters (pressure, flow) were measured with a differential pressure gauge and an ultrasonic flow meter. With gathered measurements, the efficiency of EDS and the amount of consumed electricity were calculated through the ratio of hydraulic and electrical power. The process of modelling the efficiency characteristics for EDS components is presented. Several different combinations of EDS components are studied and analysed. We compared the efficiency of electric motors of various power and efficiency classes controlled by a frequency converter and loaded with centrifugal pumps of different diameters. A comparison of the efficiency of the new EDS combinations is given, as well as the financial savings compared to the old, existing system.

• Keywords: electrical drive system, efficiency, motor, pump, electrical energy, power