Dobavitelji podporne opreme za frekvenčne pretvornike vas opominjajo, da so elektromotorji glavni vir energije za sodobno industrijsko proizvodno opremo. Težave, kot so visoka poraba energije, regulacija visoke hitrosti in slaba stabilnost industrijskega krmiljenja elektromotorjev, že dolgo časa pomembno vplivajo na industrijsko proizvodnjo. Uporaba frekvenčnih pretvornikov je učinkovito rešila te tehnične težave elektromotorjev. Frekvenčni pretvorniki uporabljajo mikroelektronsko tehnologijo in tehnologijo pretvorbe frekvence za prilagajanje frekvence in napetosti izhodnega napajanja glede na dejanske potrebe motorja po napajalni napetosti med delovanjem, pri čemer se zanašajo na odklop notranjih IGBT-jev za doseganje regulacije hitrosti in varčevanja z energijo.
1. Kategorija obremenitve klimatske naprave
Poslovne stavbe, nakupovalni centri ter nekateri supermarketi in tovarne imajo centralne klimatske naprave, ki poleti med največjo porabo električne energije porabijo veliko. V vročem vremenu poraba električne energije klimatskih naprav v Pekingu, Šanghaju in Shenzhenu predstavlja več kot 40 % največje porabe električne energije. Zato je uporaba frekvenčnega pretvornika za pogon hladilne črpalke, črpalke za hladno vodo in ventilatorja klimatske naprave zelo dobra tehnologija za varčevanje z energijo. Trenutno je po vsej državi veliko podjetij, specializiranih za energetsko varčne klimatske naprave, glavna tehnologija pa je regulacija hitrosti s spremenljivo frekvenco s frekvenčnimi pretvorniki za varčevanje z energijo.
2. Obremenitev tipa drobilnika
There are many crushers and ball mills used in metallurgical mines and building materials, and the effect of using frequency conversion for such loads is significant.
3. Large kiln and calcination furnace loads
Previously, large industrial rotary kilns (converters) in metallurgy, building materials, caustic soda, etc. mostly used DC, rectifier motors, slip motors, cascade speed regulation, or intermediate frequency unit speed regulation. Due to the use of slip rings or low efficiency in these speed control methods, many units have adopted variable frequency control in recent years, which has achieved excellent results.
4. Compressor type load
Compressors also belong to the widely used load category. Low pressure compressors are widely used in various industrial sectors, while high-pressure large capacity compressors are widely used in steel (such as oxygen concentrators), mining, fertilizers, and ethylene. Adopting variable frequency speed regulation brings advantages such as low starting current, energy saving, and optimized equipment service life.
5. Rolling mill load
In the metallurgical industry, in the past, large rolling mills often used AC-DC-AC frequency converters. In recent years, AC-DC-AC frequency converters have been adopted, and AC conversion of rolling mills has become a trend, especially in light load rolling mills. For example, the multi stand aluminum rolling mill unit of Ningxia Ethnic Aluminum Products Factory uses a universal frequency converter to meet low-frequency load starting, synchronous operation between stands, constant tension control, and simple and reliable operation.
6. Hoist type load
The winch type load adopts variable frequency speed regulation, which is stable and reliable. The blast furnace hoisting equipment in the iron plant is the main equipment for transporting ironmaking raw materials. It requires smooth starting and braking, uniform acceleration and deceleration, and high reliability. The original method often used cascade, DC, or rotor series resistance speed regulation, which had low efficiency and poor reliability. Replacing the above speed regulation method with an AC frequency converter can achieve ideal results.
7. Converter type load
Converter type loads, using AC frequency conversion instead of DC units is simple, reliable, and operates stably.
8. Roller type load
Roller type loads are mostly used in the steel and metallurgical industry, and AC motor frequency conversion control is adopted to improve equipment reliability and stability.
9. Pump loads
Pump loads have a large quantity and wide range, including water pumps, oil pumps, chemical pumps, mud pumps, sand pumps, etc. There are low-pressure small and medium capacity pumps, as well as high-pressure large capacity pumps.
Many water companies use variable frequency speed regulation for their water pumps, chemical pumps in the chemical and fertilizer industries, reciprocating pumps, and mud pumps in industries such as non-ferrous metals, all of which produce very good results.
10. Crane and dump truck loads
Cranes, dump trucks, and other loads require high torque and stability, frequent forward and backward movements, and reliability. Variable frequency devices can control cranes and dump trucks to meet these requirements.
11. Wire drawing machine type load
The wire drawing machine for producing steel wire requires high-speed and continuous production. The steel wire strength is 200Kg/mm2, and the speed control system requires high precision, high stability, and synchronization.
12. Transport vehicle loads
The use of frequency conversion technology in coal mine raw coal loading vehicles or steel mill water transport vehicles is very effective. Fast start stop, strong overload capacity, flexible forward and reverse rotation, achieving smooth coal surface and correct weight (no excessive or insufficient loading), basically without manual operation, improving raw coal production efficiency and saving electricity.
13. Elevators, elevated tourist vehicles, and other types of loads
Due to the fact that elevators are manned vehicles, it is required that the drag system be highly reliable, and frequent acceleration, deceleration, and forward/reverse rotation are required. The improvement of elevator dynamic characteristics and reliability not only enhances the sense of safety, comfort, and efficiency of elevator ride, but also increases the overall safety, comfort, and efficiency of elevator passengers. In the past, elevator speed regulation was mostly DC, but in recent years, it has gradually shifted to AC motor variable frequency speed regulation, whether in Japan or Germany. Many elevator factories in our country are competing to equip elevators with variable frequency speed regulation. Shanghai Mitsubishi, Guangzhou Hitachi, Qingdao Fuji, Tianjin Otis, and others all use AC variable frequency speed regulation. Many previously produced elevators have also undergone frequency conversion renovations.
14. Feeder type load
V panogah, kot so metalurgija, energetika, premogovništvo in kemijsko inženirstvo, obstajajo številni podajalniki. Ne glede na to, ali gre za diskovni ali vibracijski podajalnik, ima uporaba regulacije hitrosti s spremenljivo frekvenco pomemben učinek. Diskovni podajalnik proizvodne linije žveplove kisline v tovarni barvil podjetja Jihua je bil prvotno zasnovan za regulacijo hitrosti zdrsa, z nizkim nizkofrekvenčnim navorom, pogostimi okvarami in pogostimi zastoji. Po uvedbi frekvenčne pretvorbe regulacije hitrosti ima zaradi asinhronega stroja visoko zanesljivost, varčevanje z energijo in, kar je še pomembneje, zaprto zanko s temperaturnim oddajnikom, kar zagotavlja natančnost transporta materiala, da ne pride do nesreč zaradi prekomernega pregrevanja transporta oksidanta, kar zagotavlja urejenost proizvodnje.