Abstract: An efficient and reliable high-pressure sodium lamp electronic ballast based on variable frequency control is developed. The design of frequency modulation technology eliminates acoustic resonance, and simple and reliable resonant start circuit and overcurrent, overvoltage and abnormal protection circuits. . Key words: high pressure sodium lamp; acoustic resonance; frequency modulation; series resonance CLC number: Document code: Article number: This article refers to the address:...
The traditional control system design is based on the known mathematical model of the system. Therefore, the quality of the control system has a lot to do with the accuracy of the mathematical model. However, the actual system is very different and complex, so it is difficult to find a suitable description model. It is even more difficult for nonlinear systems, and sometimes it can't even be done. The neural network is different for the control system design. Instead of the mathematical...
In order to solve the problems of irrational structure and environmental protection of the national energy industry, China began construction of the West-East Gas Pipeline project in 2000. After that, long-distance, large-caliber gas pipelines entered the peak period of construction. In order to improve the conveying capacity of the long-distance pipeline and compensate for the pressure loss on the gas pipeline, a compressor station needs to be established in the middle of the long-distance...
2fae=ingLiUShanghai Ingesolan Retracting Machine Limited Division Real Speed Control Qiao Air Machine Ingersoll Rang N Old VANA Screw Air Compressor Does your factory use screw air compressor, noise, energy consumption, Whether the problems of air leakage and control series - directly plagued you, a new type of revolutionary technology N old VANA hybrid permanent magnet motor synchronous motor can greatly improve the efficiency of your air system and bring huge to your business Benefits...
Engineering technology. Science and technology innovation report on the application of variable frequency screw air compressor in mine Du Xiufeng Kailuan Group Co., Ltd. Jinggezhuang Mining Branch Hebei Tangshan 063026 frequency conversion training technology is a long-term advanced technology Consumption has become the dumb drop card production cost of the next section of the machine in the milk with the rapid development of power electronics technology microelectronics technology and computer...
Design of On-line Monitoring System for Air Compressor under Frequency Conditions Wu Li Ma Junqi 2, Li Xiao Zhang Dong 1 1 School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China 2 Henan Longyu Coal Chemical Co., Ltd. In order to ensure the authenticity of data monitoring, the air compressor online monitoring system designed anti-interference measures for harmonic interference, and at the same time realized the scientific management of air...
1 Reliability model of variable frequency constant pressure gas supply system. The speed regulation of the frequency converter realizes constant pressure air supply, reliable operation, constant system pressure and good control effect. The most important thing is to achieve high efficiency and energy saving. At the same time, the soft start of the motor is adopted by the inverter, which reduces the equipment consumption and prolongs the service life of the air compressor. The frequency...
Nowadays, people's requirements for the comfort of work and living environment are getting higher and higher, which leads to the increasing popularity of air conditioners. At the same time, consumers are increasingly demanding the performance of air conditioners, which makes people's complaints about the quality of air conditioners continue to increase, which gives research and development personnel of major air conditioner manufacturers and universities, research. The air conditioning...
The current market presents a phenomenon of high energy consumption and high pollution. However, with the advancement of technology, the future inverter air compressors will be expected to use more advanced frequency conversion technology to design for different markets and different working conditions at home and abroad. As a general-purpose machine, the use of air compressors is very extensive. It is also loved by the fact that there are few wearing parts and unattended, and its market share...
The advantage of frequency conversion speed regulation technology for fan pump speed regulation is to use the frequency conversion technology to adjust the fan pump speed to eliminate the starting impact, realize the soft start and soft stop of the motor, so that the motor can run smoothly and reduce the bearing. Mechanical wear reduces equipment maintenance costs. It can be seen from n=60f(1―S)/p that the speed of the motor is proportional to the input power frequency of the motor, so the use...
Determination of Excitation Force Inverter Scroll Compressor Noise Reduction Technology Analysis By using modal analysis and acoustic analysis methods, it is found that the pressure and vibration frequency generated by the scroll parts should be avoided as much as possible with the natural frequency of the shaft, which is very effective for noise reduction. of. Based on the analysis and experimental results, this paper finds an improved method to optimize the natural frequency of the shaft to...
Innovative little fis high-tech domain water industry based on the distributed control system of air compressor variable frequency constant pressure gas supply transformation Zheng Dejin Sun Jianhua Yang Xu (Hebei Iron and Steel Group Jixian Sijiaying Iron Mine Co., Ltd., Hebei Tangshan 063701 for frequency conversion transformation, realized Air compressor PID automatic constant pressure regulation, energy saving effect is remarkable. There are two screw air compressors in the Sijiaying Iron...
In order to solve the problems of irrational structure and environmental protection of the national energy industry, China began construction of the West-East Gas Pipeline project in 2000. After that, long-distance, large-caliber gas pipelines entered the peak period of construction. In order to improve the conveying capacity of the long-distance pipeline and compensate for the pressure loss on the gas pipeline, a compressor station needs to be established in the middle of the long-distance...
In the mid-1960s, A.schomlng and others in Germany proposed the idea of PWM frequency conversion, and applied the modulation technology used in the communication system to the frequency conversion speed regulation, which opened up a new development for the development and engineering development of modern AC speed regulation technology. path of. The AC front speed control technology has been widely used in pumps, fans, elevators, etc. Many coal machinery industries, fiberglass and...
In the automation transformation of a coal mine air compressor in Jincheng, Shanxi, a set of variable frequency constant voltage monitoring system with various sensors, transmitters and actuators was designed with PLC as the core. The system continuously adjusts according to the change of wind power demand, ensures constant pressure gas supply, saves energy, protects equipment, and realizes scientific management of equipment. 1 Equipment Overview There are 4 SA200A air compressors in a coal...
The first 48-pulse dry-type rectified variable frequency speed-regulating transformer developed by TBEA Xinjiang Transformer Factory Box Change Co., Ltd. was qualified for one-time test, and sent to the user! The product model is ZTSGSF-1250/10, the high voltage coil voltage level is 10kV, and the low voltage coil consists of 24 sets of phase shifting windings. The key technical parameters of the product, such as the phase shift angle error of the secondary side variable winding, The voltage...
introduction As green environmental protection, energy conservation and emission reduction have gradually become the themes of the Chinese market and society, government supervision has been increasing year by year, and the requirements for low energy consumption of various products have become stricter. From small home appliances such as razors and hair dryers to industrial automation production lines, a wide variety of motors play a central role in various consumer products and industrial...
The type of chopping machine, minced meat, and the main raw material of fat are finely chopped. At the same time, other raw materials such as water, ice chips, seasonings, additional products and minced meat are stirred together to form a uniform milk. The high speed rotation of the file can shorten the running time, reduce the heat of the material and maintain the natural color of the filling. During the operation, the meat and the auxiliary materials are kneaded into meat or meat in a short...
Recently, Dajing Pump Industrial Co., Ltd. of Taiwan developed a new generation of horizontal multi-stage centrifugal pump and computer variable frequency constant pressure pump, which has the characteristics of no rust, water and power failure protection and voltage regulation, which improves the noise of traditional cast iron pump. Defects such as rust. The company's pump products have been in high market share for many years, and most of the past products are mainly in the home market....
The main components of the variable frequency speed control chopping machine are processed by machining center to ensure the processing accuracy. The file is made of imported materials and processed by special techniques. The crucible is made of all stainless steel and has anti-overflowing edge to prevent seepage and overflow. The blade is sharp and durable, and the operation is stable at high speed. The material is mixed and the emulsification effect is good. Imported bearings are used; the...
As we all know, the variable frequency motor is a motor that operates continuously under the standard environmental conditions with a rated load of 100% to 100% within the rated speed range, and the temperature rise does not exceed the allowable value of the motor. What is the difference between the maintenance method of the inverter motor and the ordinary motor? Due to the special nature of the variable frequency power supply, the winding insulation of the variable frequency motor is stricter...
In recent years, with the increasing maturity of frequency conversion speed regulation technology, its remarkable energy-saving effect and reliable and stable control mode have been widely used in water supply systems. The variable frequency constant pressure water supply system implements stepless speed regulation on the pump motor. According to the water consumption and water pressure change, the microcomputer detects and calculates, automatically changes the pump speed to keep the water...
The cooling load of the central air conditioner changes with the change of the ambient temperature and the use area. The water pump motor of the fixed flow water system basically runs at full load, forming a phenomenon of large flow and small temperature difference, for the case of low efficiency and high energy consumption. The air conditioning water system frequency converter is used to control the operation of the chilled water pump motor, so that the flow rate of the chilled water is...
1 Electromagnetic interference (EMI) analysis 1.1 Concepts and approaches of electromagnetic interference Electromagnetic interference is generated by sources of interference. It is an electromagnetic phenomenon that is external and internal and detrimental to useful signals. Interference interferes with the form of sensitive components, transmission lines, inductors, capacitors, space fields, etc. and acts in some form. The interference effects and phenomena are common and different in form,...
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