Analog variable frequency filters require the use of variable passive components. The larger the slope of the filter, the more variable passive components are required. Many of these components are potentiometers. For example, a low-pass Butterworth filter with a slope of 18 dB/8 frequency requires the use of a three-potentiometer potentiometer. If we need to re-tune the low-pass and high-pass filters at the same time, the necessary number of potentiometer resistor taps will double. This is...
For the inverter, it is believed that many electric power practitioners are not unfamiliar. Compared with the traditional electric circuit control, the frequency converter has a high technological content and is a combination of strong and weak electricity. Therefore, its failures are various and can only be Combining theoretical knowledge with practice to sum up experience, here are 15 examples of frequently asked questions about frequency converters. Do you understand this? 1, what is the...
Fixed frequency air conditioner China's grid voltage is 220 volts and 50 hertz. Air conditioners operating under these conditions are called fixed-frequency air conditioners. Because the frequency of power supply cannot be changed, the compressor speed of traditional fixed frequency air conditioners is basically constant, and the indoor temperature is adjusted by constantly turning on and off the compressor. The room temperature is likely to be hot and cold, and is consumed between on and...
Datang Zhangjia Power Generation Plant (Zhangjiakou 075131, Hebei Province) Wang Haibin has a comprehensive experimental study to help users understand the frequency conversion performance of this fan and the problems in operation, and also analyze the investment return period of the inverter fan for the future. The power plant chooses the wind turbine to provide data basis. Rate; speed. 26: B. Implementing “separate plant network and bidding online” puts higher requirements on the reliability...
On October 29th, the three sets of neutron-made variable-frequency propellers were delivered at the new Siwu shipyard in Malaysia, which marked the initial success of the development of the domestic market of hansli domestic products, and the “going to the domestic electric propulsion system”. Going out has a great symbolic meaning. It is reported that Hanlix's export-oriented inverter-driven propellers, all intellectual property rights are owned by Hanlux. Since the order was received,...
The elliptical housing of the master tracking mechanism changes continuously as the phase of the housing changes during the rotation process. To achieve automatic welding, the distance between the welding gun and the center of rotation of the housing must be changed according to the change of its radius of gyration, so that the relative distance between the welding gun and the housing does not change, that is, the automatic tracking of the weld is realized. The automatic welding machine adopts...
The energy utilization rate of China's motor drive system is about 20% lower than that of foreign countries, and the total energy saving potential is about 100 billion kWh. Therefore, the energy-saving measures should be taken for asynchronous motors to tap potential energy. Optimize the motor structure and process, and develop high-efficiency motors to improve motor efficiency and save power. YX series high-efficiency motors are made of high-quality cold-rolled silicon steel sheets with...
In domestic water and industrial water, as well as various boilers, fire-fighting and other water supply systems, traditional high-level water tanks, pneumatic pressurization and other equipment are used. These equipments are not only expensive to invest, but also difficult to maintain, and they cannot meet the demand for large-flow water supply. The constant pressure water supply system adopting frequency conversion speed regulation overcomes the shortcomings of the traditional water supply...
The variable frequency power supply is a device that uses variable frequency technology and microelectronic technology to control the electric drive of the AC motor by changing the frequency and amplitude of the working power of the motor. It is widely used in the power system. It includes single-phase variable frequency power supply, three-phase variable frequency power supply and so on. The variable frequency power supply is a kind of electronic device device. It not only has strict...
In recent years, with the rapid development of power electronic devices, control theory and computer technology, high-voltage inverter technology has gradually matured, and the reliability of inverters has increased, contributing to energy saving and consumption reduction, not only can significantly reduce power consumption, but also It can improve the level of equipment automation, improve the operation status of equipment, and save equipment maintenance costs, thus achieving the purpose of...
Standard cage induction motors are generally fan-cooled, that is, wind blades are added to the output shaft of the motor. When the motor is running, the blades are rotated and cooled to discharge heat from the motor to achieve a thermal balance. At present, the inverter motor on the market, if not specified when ordering, the default standard is to use independent fan cooling, the structure does not have blades on the motor shaft, instead a fan is installed in the fan blade of the motor. That...
Under variable frequency conditions, the torque at low frequencies (ie, the starting torque) approaches the maximum torque. That is to say, the starting torque of the motor under the variable frequency condition is not a problem, and it is not necessary to increase the rotor resistance to increase the starting torque like the conventional motor, and the rotor winding has no obvious skin effect when the frequency conversion is started. Therefore, the structure of the double squirrel cage or deep...
The physical experiment was carried out on the two motors by physical experiments, and the experimental results were compared with the results of conventional motor experiments. The voltage type general-purpose inverter is used in the experiment, and the central processing unit has the conversion precision in place. The measuring instrument used in the conventional motor experiment is Yokogawa's power analyzer. In order to make the identification current reach the given value and prevent...
1, small size, light weight, easy to operate 2, the blue screen displays test data, test status, and has real-time operation step prompt function 3, can flexibly set the test voltage, frequency modulation range, pressurization time, protection current 4, the test results can calculate the capacitance of the test 5, with computer communication interface, can communicate with the computer and test data management 6, there is real-time time display, can store 200 sets of test data 7, high...
At present, there are more and more XLPE XLPE insulated power cables in the world and domestic to replace the original oil-filled paper-insulated power cables. However, the test method before the cross-linked cable was put into operation was still based on the test method of DC withstand voltage due to the large capacity of the test and the test equipment. In recent years, the research results of many international and domestic research institutions have shown that DC test has different degrees...
The frequency conversion series resonance complete test device is also called variable frequency series resonance AC withstand voltage test device, frequency conversion resonance, frequency conversion series resonance, series resonance, frequency modulation series resonance, series resonance withstand voltage test device, series resonance test equipment, cable withstand voltage test device, Power frequency withstand voltage test device, AC high voltage cross-linked cable AC withstand voltage...
It is known that when the loop frequency f = 1/2π √ LC, the loop resonates. At this time, the voltage on the sample is Q times the output voltage of the excitation high voltage terminal. Q is the system quality factor, that is, the voltage resonance multiple, which is generally several tens to one hundred or more. Firstly, the loop is resonated by adjusting the output frequency of the variable frequency power supply, and then the output voltage of the variable frequency power supply is adjusted...
Attentive netizens will find that when we look at some refrigerators, air conditioners or washing machine products, we can see keywords with the word "inverter" in the title. Of course, the frequency conversion mentioned here is the product of variable frequency motor. So what are the characteristics of the inverter motor compared to the motor used in our home appliance products before? What special experience can we bring to us? Let us Explore together. What are the advantages of...
Recently, CSSC Huanan Ship Machinery Co., Ltd. newly signed two sets of “500-ton electric variable-frequency winding pile cranes for offshore wind power installation platform project” contract, which is the “650 tons of electro-hydraulic winding pile cranes” signed in June. The same type of product order that is accepted again after the contract. It is reported that this type of pile-type pile crane is a special crane installed on various jack-up offshore platforms. Because its center passes...
1. Brief introduction of the original mine hoist speed control system and frequency conversion electronic control system Hebei Qifengfeng Mining Group Corporation is a national large-scale enterprise and a national top 100 coal enterprise. The Group's New Third Mine has a pair of vertical mines. The well lifting system adopts 380KW/6KV three-phase asynchronous motor, and the rotor string resistance speed double-speed lifting work mode. Since the New San Mine is a mine built in 1995 on the...
As people's requirements for quality of life are getting higher and higher, people's requirements for refrigerator products are not only simple requirements for preservation and refrigeration, but also energy-saving, frost-free, and intelligent functions are favored by more people. Especially the air-cooling function and the frequency conversion function, the conventional direct cooling technology has many shortcomings, poor temperature uniformity, manual defrosting, etc., which makes...
1 Introduction This article refers to the address: http:// Based on the experience of the brains, the experience of rote memorization, although it can quickly solve some kind of failure, but knows it but does not know why. Of course, this will not be bypassed. As a result, the idea is narrow. When the fault phenomenon or the fault location is slightly different, it will be helpless. When encountering a completely different new model, it is impossible to detect... After the necessary conditions...
On September 26th, Weiken (Suzhou) Electric Drive Co., Ltd. successfully held a new product launch conference for “new products, new future” inverter drive in Suzhou factory. More than 100 Vacon China partners and end users were invited to attend. During the conference, Vacon also released a number of new variable frequency drive products, and its technical characteristics can meet the needs of almost all current variable frequency drive applications. China's industrial development is...
Thermo ScientificTM TSX Series Variable Frequency Ultra Low Temperature Refrigerator White Paper -- Best sample protection, lowest energy consumption The laboratory samples are invaluable, not only for the fruitful results you have achieved, but also for your future work. Therefore, the laboratory relies heavily on freezing equipment that can reach -80 ° C ultra-low temperature to store samples to reduce biochemical activity in the sample and maintain its structural integrity, so that the...
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