Umphakeli wedivayisi yempendulo ye-elevator energy ukukhumbuza ukuthi umthwalo wekheshi wakhiwe imoto kanye ne-counterweight balance block. Kuphela uma umthamo womthwalo wemoto yekheshi ingu-50%, imoto yekheshi kanye nebhulokhi yebhalansi ye-counterweight kusesimweni esiyisisekelo sokulingana. Uma kungenjalo, kuzoba nomehluko omkhulu phakathi kwemoto yekheshi kanye ne-counterweight, okuzoholela emandleni anamandla emishini ngesikhathi sokusebenza kwekheshi. Lapho isisindo semoto yekheshi singaphansi kwesisindo se-counterweight, umshini wokudonsa okhuphukayo wekheshi ukhiqiza ugesi futhi amandla abheke phansi adliwe; Ngokuphambene, ukusetshenziswa kwamandla okukhuphuka nomfula kanye nokukhiqizwa kwamandla angezansi. Lapho ilifti yehla nomthwalo osindayo futhi ikhuphuka nomthwalo omncane, amandla akhiqizwayo azoguqulelwa amandla kagesi e-DC ngomshini wokudonsa kanye nesiguquli sefrikhwensi. Iyunithi yempendulo yezamandla izobe isibuyisela le ngxenye yamandla kagesi kugridi yamandla ukuze isetshenziswe izinto zikagesi, kufinyelele umgomo wokonga ugesi. Kungase futhi kuqondwe kalula njengenqubo yomshini wokudonsa odonsa umthwalo ukuze wenze umsebenzi, uqedela ukuguqulwa kwamandla emishini namandla kagesi.
Izinzuzo zomphakathi nezomnotho zamadivayisi wempendulo yekheshi lamandla
Okokuqala, ingafinyelela umgomo wokuvikelwa kwemvelo eluhlaza. I-lifti yohlobo lwempendulo yamandla yokonga amandla ngokuyinhloko ibuyisela amandla okubhuleka avuselelwayo akhiqizwa ngesikhathi sokusebenza kwekheshi kuya kugridi yamandla ngedivayisi ethile yempendulo, kuyilapho iqinisekisa ukuthi i-waveform yegagasi lomsakazo oseceleni lomthombo yenza igagasi elinesine. Kungale ndlela kuphela engahlangabezana nezidingo zokuhambisana kwe-electromagnetic. Ngaphezu kwalokho, njengoba lawa makheshi esetshenziswa kakhulu emishinini yokudonsa engena gearless esebenza kahle kakhulu, awadingi ukuthi kufakwe uwoyela ngaphakathi ukuze asetshenziswe, okunomthelela omuhle ekuvikelweni kwemvelo. Ama-Elevator awagcini nje ngokusindisa amandla, kodwa futhi ahlinzeka ngokuvikeleka okukhulu kwemvelo.
Secondly, it can achieve the goals of energy conservation, consumption reduction, and resource conservation. With the continuous development of the economy, the number of elevators in use is increasing, which has also made elevators one of the largest "users" in terms of electricity consumption. In order to achieve the goal of saving energy, many units have already applied energy feedback technology to elevators, which can save a high amount of electricity every year. The application of this energy-saving elevator is in line with the requirements of building a conservation oriented design, bringing great positive effects to energy conservation and consumption reduction in China, and achieving a win-win situation of economic and social benefits.
In addition, it can reduce investment and save development costs to a certain extent. In energy feedback elevators, the use of efficient gearless energy-saving hosts can greatly reduce the power of the elevator main motor. In the domestic elevator industry, many units have not given high attention to energy-saving issues during elevator operation, and there has been a lack of relevant regulations to restrict the energy consumption level of elevators. This has led to an increasing electricity consumption of elevators, which cannot achieve energy-saving effects. In recent years, China has experienced sustained electricity shortages nationwide, and energy issues have posed a great threat to the country's economic development. Due to various reasons, energy conservation has become the top priority for the development of today's society. Therefore, energy feedback energy-saving elevators have been promoted and applied, and their application prospects are relatively broad. Against the backdrop of conservation, they have gradually formed a resource-saving industrial structure and consumption structure, laying a solid foundation for building a resource-saving society with Chinese characteristics.
The working principle of energy feedback in elevator frequency conversion system
To apply energy feedback technology in elevators, there must first be available mechanical energy and other energy that can be utilized, and then the energy must be utilized. Therefore, we analyze its working principle from two aspects: application premise and working principle.
2.1 Preconditions for the Application of Energy Feedback Technology in Elevator Frequency Conversion Systems
To apply energy feedback technology, it is necessary to first clarify the existence of usable energy in its operating system, which is a basic condition for utilizing energy feedback technology. Therefore, we analyze the elevator from the perspective of operating characteristics. During the operation of the elevator, when it reaches the maximum operating speed, the system has the highest mechanical energy during operation. This maximum mechanical energy will be gradually released during the process from reaching the stop floor until it stops. In this process, there is available energy, which becomes a prerequisite for the application of energy feedback technology in elevator frequency conversion systems.
2.2 Working principle of energy feedback technology in elevator frequency conversion system
Due to the vertical motion characteristics of elevators, there must be varying potential energy. The elevator system will use counterweight balance blocks to solve this problem. However, usually only when the load capacity of the elevator car reaches about 50%, will the car and counterweight be balanced. At this time, the mass difference between the two is minimized, and the amount of electricity generated and consumed during their movement is minimized. The load of the elevator car is usually not fixed. After using energy feedback technology, when the load is small, the elevator can generate electricity through the traction machine when going up, and consume the stored electricity when going down; When the load is large, the upstream consumes electricity and the downstream generates electricity. In this process, the mechanical energy generated by the elevator's upward movement can be converted into direct current through the traction machine combined with a frequency converter. Through the use of an energy feedback unit, this part of the electrical energy can be fed back to the local electrical network of the elevator system. At this time, all electrical equipment in the network can use the generated electrical energy, saving the system's electricity consumption. The traction machine here is equivalent to an electric motor. When the elevator system is in operation, the traction machine performs work on the load, converting mechanical energy into electrical energy. Otherwise, it consumes electrical energy to complete its load movement.
Advantages of Energy Feedback in Elevator Applications
3.1 Energy saving application of energy feedback technology in elevator frequency conversion system
Through energy feedback technology, the elevator frequency conversion system changes the action of the electric motor through a frequency converter, converting the mechanical kinetic energy of the elevator during load release into electrical energy and storing it in the capacitor of the DC link of the frequency converter. In the process of storing and discharging capacitors, non energy feedback inverters can effectively solve the heat dissipation problem caused by the conversion of mechanical energy into thermal energy through braking units and high-power resistors. By utilizing the stored electricity in capacitors, the heat generation can be greatly reduced, eliminating the need for fans and air conditioning installed for heat dissipation in the machine room. The non consumption reuse of stored electricity can well reflect the energy-saving effect of energy feedback technology in elevator frequency conversion systems.
3.2 Energy saving capacity of elevators with energy feedback devices
After analysis, calculation, and actual measurement, it can be known that the amount of electricity saved is related to factors such as the number of elevator runs, load capacity, operating height, and overall efficiency of the elevator. Generally speaking, elevators with high frequency of use, fast rated speed, large rated load capacity, and high lifting height have more significant energy-saving effects. If the situation is the opposite, its energy-saving effect is not significant.
Application of energy feedback in elevator frequency conversion system
4.1 Elevators are suitable for installing energy feedback devices
Electricity resources are one of the power and energy sources heavily relied upon in modern production and life. However, due to the current concept of energy conservation and emission reduction, there should also be certain planning and control for the rational use of electricity. During the continuous up and down movement of an elevator, energy is frequently utilized and converted. When the elevator is moving up and down at its fastest speed, its mechanical energy is at its maximum. When it stops moving, slowly begins to move up and down, or slowly stops moving up and down, the mechanical energy is smaller than when it is moving up and down at its fastest speed. The less energy is only dissipated through thermal energy. Moreover, elevators are frequently used, and this energy gradually accumulates, forming a large part of the energy. It is necessary to take a series of measures to make reasonable use of this energy, convert it into other capabilities for production and daily use, and play an energy-saving role. This is the premise for elevators to be suitable for installing energy feedback devices.
Ezinsizeni zanamuhla ezincipha ngokwandayo ezingavuseleleki, ukunciphisa ukusetshenziswa kwamandla okungenasidingo ohlelweni lokukhiqiza kanye nokwenza ngcono ukusebenza kahle kokusetshenziswa kwamandla kuyiziqinisekiso ezibalulekile zokuzuza intuthuko esimeme futhi kuhambisana nesu laseShayina lokuthuthukisa amandla. Isiguquli semvamisa yempendulo yamandla singanciphisa ngempumelelo amandla asebenzayo enjini ngesikhathi sokuzungezisa phambili, futhi siqinisekise ukuthi amandla engeziwe angageleza abuyele kugridi ngesikhathi sokuzungezisa imoto. Esikhathini esizayo sokuthuthukiswa kobuchwepheshe obuphezulu kumakheshi, imakethe idinga ngokushesha imikhiqizo enamanani aphansi, ukwethembeka okuphezulu, impilo ende yesevisi, nezindleko eziphansi zokusebenza. Amakheshi wempendulo yamandla azoduma futhi abonwe yimakethe. Ngakho-ke, izisebenzi ezifanele kufanele ziphikelele ocwaningweni lweziguquli zokuphindaphinda kwempendulo yamandla, zikhuthaze ukusetshenziswa kweziguquli zokuphindaphinda kwempendulo yamandla, futhi zithuthukise izinga lokusebenzisa eliphelele lamandla.