Energiatagasisideseadmete tarnijad tuletavad meelde, et sagedusmuundureid kasutatakse laialdaselt, jagades need pingetasemete järgi madalpinge sagedusmuunduriteks ja kesk-kõrgepinge sagedusmuunduriteks. Iga tööstusharu rakenduse eesmärk ja nõuded on erinevad.
1. Sagedusmuundurite rakendamine sagedusmuundamise energiasäästu aspektides
The energy-saving aspect of frequency converters is reflected in the application of fans and pumps. After adopting variable frequency speed regulation, the energy-saving rate of fans and pump loads is 20% to 60%, because the actual power consumption of fans and pump loads is basically proportional to the third power of the speed. When the average flow rate required by users is small, fans and pumps use variable frequency speed regulation to reduce their speed, which has a significant energy-saving effect. However, traditional fans and pumps use baffles and valves for flow regulation, with the motor speed remaining basically unchanged and the power consumption not changing much. According to relevant statistics, the electricity consumption of fan and pump motors accounts for 31% of the national electricity consumption and 50% of industrial electricity consumption. The use of variable frequency speed regulation devices on such loads is of great significance. Currently, successful applications include constant pressure water supply, various types of fans, central air conditioning, and hydraulic pump variable frequency speed regulation.
2、 Application of frequency converter in automation system
Due to the built-in 32-bit or 16 bit microprocessor in the frequency converter, which has various arithmetic logic operations and intelligent control functions, the output frequency accuracy is 0.1%~0.01%, and it is equipped with complete detection and protection links, so the frequency converter is widely used in automation systems. For example, winding, stretching, measuring, and wire guiding in the chemical fiber industry, flat glass annealing furnaces, glass kiln mixing, edge drawing machines, bottle making machines in the glass industry, automatic feeding and batching systems for electric arc furnaces, and intelligent control of elevators.
3、 The application of frequency converters in improving process level and product quality
Variable frequency drives are widely used in various mechanical equipment control fields such as transmission, lifting, extrusion, and machine tools. They can improve process level and product quality, reduce equipment impact and noise, and extend equipment service life. After adopting frequency conversion speed control, the mechanical system is simplified, operation and control are more convenient, and some can even change the original process specifications to improve the functionality of the entire equipment. For example, in textile and many other industries, the temperature inside the shaping machine is adjusted by changing the amount of hot air sent in. Circulating fans are usually used for conveying hot air, and since the fan speed remains constant, the amount of hot air sent can only be adjusted by the air damper.
Kui õhuukse reguleerimine ebaõnnestub või seda ei reguleerita õigesti, kaotab see vormimismasina üle kontrolli ja mõjutab valmistoote kvaliteeti. Kui tsirkulatsiooniventilaator käivitub suurel kiirusel, on ajamirihma ja laagri vaheline kulumine väga suur, mistõttu ajamirihm muutub tarbekaubaks. Pärast sagedusmuunduri kiiruse reguleerimise kasutuselevõttu saab temperatuuri reguleerida ventilaatori kiiruse automaatse reguleerimisega sagedusmuunduri kaudu, mis lahendab toote kvaliteedi probleemi. Lisaks saab sagedusmuundur ventilaatori hõlpsalt käivitada madalal sagedusel ja madalal kiirusel, vähendades ajamirihma ja laagrite vahelist kulumist, pikendades seadme kasutusiga ja säästes 40% energiat.
4. Sagedusmuunduri rakendamine mootori pehme käivituse saavutamiseks
Mootorite äkiline käivitamine mitte ainult ei mõjuta tõsiselt elektrivõrku, vaid nõuab ka võrgult liigset võimsust. Käivitamisel tekkiv suur voolutugevus ja vibratsioon kahjustavad oluliselt deflektoreid ja ventiile, mis omakorda lühendab seadmete ja torujuhtmete kasutusiga. Pärast sagedusmuunduri kasutamist põhjustab sagedusmuunduri pehme käivituse funktsioon käivitusvoolu muutumise nullist ja maksimaalse väärtuse mitte ületamist nimivoolu, vähendades mõju elektrivõrgule ja toiteallika võimsuse nõuet, pikendades seadmete ja ventiilide kasutusiga ning säästes seadmete hoolduskulusid.