The elevator energy feedback device supplier reminds you that the elevator load is composed of the car and the counterweight balance block. Only when the load capacity of the elevator car is 50%, the elevator car and the counterweight balance block are in a basic equilibrium state. Otherwise, there will be a mass difference between the elevator car and the counterweight, resulting in mechanical potential energy during elevator operation. When the weight of the elevator car is less than the weight of the counterweight, the upward traction machine of the elevator generates electricity and the downward power is consumed; On the contrary, upstream power consumption and downstream power generation. When the elevator goes down with heavy load and up with light load, the mechanical energy generated will be converted into DC electrical energy through the traction machine and frequency converter. The energy feedback unit will then feed back this part of the electrical energy to the power grid for use by electrical equipment, achieving the goal of saving electricity. It can also be simply understood as the process of a traction machine dragging a load to do work, completing the conversion of mechanical energy and electrical energy.
The social and economic benefits of elevator energy feedback devices
Firstly, it can achieve the goal of green environmental protection. The energy feedback type energy-saving elevator mainly feeds back the regenerative braking energy generated during the operation of the elevator to the power grid through a specific feedback device, while ensuring that the waveform of the source side radio wave forms a sine wave. Only in this way can it meet the requirements of electromagnetic compatibility. In addition, as these elevators are mainly used in high-efficiency maintenance free gearless traction machines, they do not require any oil to be added to their interior to be used, which has a positive impact on environmental protection. Elevators not only save energy, but also provide great protection for the environment.
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.
In today's increasingly depleted non renewable resources, reducing the unnecessary consumption of energy in the production process and improving energy utilization efficiency are important guarantees for achieving sustainable development and are also in line with China's energy development strategy. The energy feedback frequency converter can effectively reduce the reactive power of the motor during forward rotation, and ensure that excess energy can flow back to the grid during motor reverse rotation. In the future of high-tech development in elevators, the market urgently needs products with low prices, high reliability, long service life, and low operating costs. Energy feedback elevators will surely be popularized and recognized by the market. Therefore, relevant personnel should persist in the research of energy feedback frequency converters, promote the application of energy feedback frequency converters, and improve the comprehensive utilization rate of energy.