Ventiliatorių vienfazių variklių su ekranuotais poliais greičio impulsinis reguliavimas

Abstract

Orui tiekti į kietojo kuro katilų pakuras taikomi ventiliatoriai su vienfaziais ekranuotų polių elektros varikliais. Šių ventiliatorių sūkimąsi siūloma reguliuoti žemo dažnio impulsiniu būdu. Sudaryta metodika impulsinio reguliavimo impulso ir pauzės trukmėms skaičiuoti. Trukmių skaičiavimas paremtas pasirinktais leistinais sukimosi dažnio svyravimais, vienodais visame ventiliatoriaus greičio reguliavimo intervale. Impulsinio reguliavimo impulso pradžią siūloma sinchronizuoti su eklektros tinklo įtampos amplitudinės vertės momentu. Pateikiamos apskaičiuotos ir eksperimentais užregistruotos ventiliatoriaus su 47 W galios elektros varikliu impulsinio reguliavimo charakteristikos

The fans with shaded pole motors are widely used for air supply to the solid fuel boiler. In order to regulate furnace capacity, the amount of air supply has to be changed. The objective of this paper is to propose the pulse regulation method for air supply to solid fuel furnace and for substantation of main rates of this regulation. The methodology for calculating the duration of pulses and pauses of suchpulse regulation in accordance with chosen variation of fan speed, which are the constant through the whole regulation interval. Equations, for calculating the duration, are based on investigation of acceleracion and deceleracion of transient processes. It was established that, the current of pulse of the shaded pole motors, regulated by pulse method, does not exceed 30% of constantly turned on motor and does not cause the overheat of the motor. In order to avoid the increase of motor current at the begining of pulse, it is suggested to sinchronyze the begining of pulse of such regulation with the moment, when electricity net voltage is peak value. The characteristics, of pulse regulation of 47 W capacity fan, are calculated, experimentally registered and presented in the article