Masu samar da kayan aikin sauya mitar suna tunatar da ku cewa tare da haɓaka fasahar sauya mitar, aikace-aikacen injinan AC yana ƙara yaɗuwa. Yin amfani da ƙa'idodin saurin jujjuya mitar na iya haɓaka daidaiton sarrafawa, haɓakar samarwa, da ingancin samfuran kayan aikin samarwa, wanda ke ba da gudummawa ga samun sarrafa kansa na tsarin samarwa. Tsarin tuƙi na AC yana da kyakkyawan aikin sarrafawa da mahimman tasirin ceton kuzari a lokutan samarwa da yawa.
Aikace-aikacen mai sauya mita
Yawan wutar lantarkin da ake amfani da injinan wutar lantarki a kasarmu ya kai kashi 60% zuwa 70% na wutar lantarkin kasa, kuma yawan wutar lantarki da fanfo da fanfunan ruwa ke amfani da su a duk shekara ya kai kashi 1/3 na wutar lantarkin kasa. Babban dalilin wannan yanayin shi ne cewa tsarin kula da saurin gudu na gargajiya na fanfo, famfunan ruwa, da sauran kayan aiki shine daidaita iskar da ruwa ta hanyar daidaita buɗaɗɗen baffles na shigarwa ko fitarwa da bawul. Ƙarfin shigarwa yana da girma, kuma ana amfani da makamashi mai yawa a cikin tsarin shiga tsakani na baffles da bawuloli.
Due to the fact that most fans and water pumps are flat torque loads, the shaft power and speed have a cubic relationship. Therefore, when the speed of fans and water pumps decreases, the power consumption also greatly decreases. Therefore, there is great potential for energy conservation. The most effective energy-saving measure is to use a frequency converter to regulate the flow rate. The application of frequency converters has a power saving rate of 20% to 50%, and the benefits are significant.
Many machines require electric motors to be able to adjust speed due to process requirements. In the past, due to the difficulty in regulating the speed of AC electric motors and the high requirements for speed regulation performance, DC speed regulation was used. However, DC electric motors have complex structures, large volumes, and difficult maintenance in winter. Therefore, with the maturity of variable frequency speed regulation technology, AC speed regulation is gradually replacing DC speed regulation, often requiring quantitative and direct torque control to meet various process requirements.
By using a frequency converter to drive an electric motor, the starting current is small, allowing for soft starting and stepless speed regulation. This facilitates acceleration and deceleration control, enabling the motor to achieve high performance and significantly save energy. Therefore, frequency converters have been increasingly widely used in industrial production and daily life.
Existing problems and countermeasures
With the expansion of the application scope of frequency converters, there are more and more problems that occur during operation, mainly manifested as high-order harmonics, noise and vibration, load matching, heating and other issues. This article analyzes the above issues and proposes corresponding measures.
The main circuit form of a universal frequency converter generally consists of three parts: rectification, inversion, and filtering. The rectification part is a three-phase bridge uncontrolled rectifier, the middle filtering part uses a large capacitor as the filter, and the inverter part is an IGBT three term bridge inverter with PWM waveform input. The output voltage contains harmonics other than the fundamental wave, and lower order harmonics usually have a greater impact on the motor load, causing torque ripple; And higher harmonics increase the leakage current of the output cable of the frequency converter, resulting in insufficient output of the motor. Therefore, both high and low order harmonics output by the frequency converter must be suppressed. The following methods can be used to suppress harmonics.
1. Increase the power supply of the frequency converter
Ƙunƙarar ciki na na'urar samar da wutar lantarki yawanci zai iya aiki azaman ma'auni don ƙarfin amsawa na ƙarfin tacewa DC na mai sauya mitar. Mafi girma da rashin ƙarfi na ciki, ƙananan abun ciki na jituwa. Wannan impedance na cikin gida shine gajeriyar da'ira na na'urar. Don haka, lokacin zabar wutar lantarki mai jujjuya mitar, yana da kyau a zaɓi na'ura mai ɗaukar hoto tare da babban gajeriyar da'ira.
2. Shigar da reactor
Haɗa na'urori masu dacewa ko shigar da tacewa masu jituwa a cikin jeri tsakanin shigarwa da tashoshi masu fitarwa na mai sauya mitar. Tace ta ƙunshi nau'in LC, wanda ke ɗaukar jituwa kuma yana ƙara ƙarfin ƙarfin wutar lantarki ko kaya don cimma manufar murkushewa.
3. Aiki da yawa ta amfani da transfoma
Mai jujjuya mitar duniya shine mai gyara bugun bugun jini guda shida, wanda ke haifar da manyan jituwa. Idan Multi-lokaci aiki na gidajen wuta da aka soma, tare da wani zamani kwana bambanci na 30 ° a tsakanin juna, hade da Y - △ da △ - △ transformers iya samar da wani 12 bugun jini sakamako, wanda zai iya rage low oda harmonic igiyoyin da kuma yadda ya kamata kashe harmonics.
4. Kafa kwazo masu jituwa
Saita keɓaɓɓen tacewa don gano mai sauya mitar da lokaci, da kuma samar da na'ura mai juzu'i mai girma iri ɗaya da akasin lokaci kamar na halin yanzu na jituwa, wanda aka wuce zuwa mai sauya mitar don shawo kan halin yanzu mai jituwa yadda ya kamata.