With the continuous development of industrial technology, the application of frequency converter is applicable to all walks of life. Today we will introduce the successful application of frequency converter in various industries. The frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit, microprocessor unit, etc. The inverter adjusts the voltage and frequency of the output power supply by switching off the internal IGBT.

Frequency converter is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motor by changing the frequency of motor working power supply. The frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit, microprocessor unit, etc. The frequency converter adjusts the voltage and frequency of the output power supply by switching off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. In addition, the frequency converter has many protection functions, such as overcurrent, overvoltage, overload protection, etc. With the continuous improvement of industrial automation, frequency converters have also been widely used.

Then, according to the industry experience of tiantuo Sifang for many years, the frequency converter can be mainly applied to 32 classic industry fields, such as: air conditioning load, crusher load, large kiln calciner load, compressor load, rolling mill load, converter load, winch load, roller load, pump load, crane, tipper load, wire drawing machine load, transportation vehicle load Elevator overhead tour car load, feeder load, stacker reclaimer load, fan load, mixer load, spinning machine load, special power load, etc.

Below we will analyze the specific applications in these industries:

1. Application of frequency converter in air conditioning load

Office buildings, shopping malls, some supermarkets and factories all have central air conditioning. During the peak power consumption in summer, the power consumption of air conditioning is very large. In hot weather, the electricity consumption of air conditioners in Beijing, Shanghai and Shenzhen accounts for more than 40% of peak electricity. Therefore, using frequency conversion device to drive the refrigeration pump, cold water pump and fan of the air conditioning system is a very good power-saving technology. At present, there are many companies specializing in air conditioning power saving in the country, the main technology of which is variable frequency speed regulation and power saving.

2. Application of frequency converter in crusher load

Many crushers and ball mills are used in metallurgical mines and building materials, and the effect of this kind of load is remarkable after frequency conversion.

3. Application of frequency converter in large kiln calciner load

In the past, most large industrial rotary kilns (converters) such as metallurgy, building materials and caustic soda used DC, commutator motor, slip motor, cascade speed regulation or medium frequency unit speed regulation. Because these speed regulation methods may have slip rings or low efficiency, in recent years, the copyright of control engineering network is reserved. Many units use frequency conversion control, and the effect is excellent.

4. Application of frequency converter in compressor load

Compressors are also widely used loads. Low pressure compressors are widely used in all industrial sectors, and high-pressure large capacity compressors are widely used in iron and steel (such as oxygen generators), mines, chemical fertilizers, and ethylene. The use of variable frequency speed regulation brings the advantages of small starting current, power saving, optimizing the service life of equipment and so on.

5. Application of frequency converter in rolling mill load

In the metallurgical industry, in the past, large-scale rolling mills used to use AC-AC converters. In recent years, AC-DC-AC converters have been used, and the AC of rolling mills has become a trend. Especially in light load rolling mills, such as the multi stand aluminum rolling mill of Ningxia national aluminum products factory, general converters are used to meet the requirements of low-frequency start-up with load, synchronous operation between stands, constant tension control, and simple and reliable operation.

6. Application of frequency converter in winch load

The winch load adopts variable frequency speed regulation, which is stable and reliable. The blast furnace winch equipment of iron works is the main conveying equipment of iron making raw materials. It requires stable starting and braking, even acceleration and deceleration, and high reliability. Originally, cascade, DC or rotor series resistance speed regulation mode was mostly used, which was inefficient and poor reliability. Using AC frequency converter to replace the above speed regulation mode can achieve ideal results.

7. Application of frequency converter in converter load

Converter type load, using AC frequency conversion instead of DC unit is simple and reliable, and the operation is stable.

8. Application of frequency converter in roller table load

Roller loads are mostly used in the iron and steel metallurgy industry. AC motor frequency conversion control can improve the reliability and stability of the equipment.

9. Application of frequency converter in pump load

Pumps have a wide range of loads, including water pumps, oil pumps, chemical pumps, mud pumps, sand pumps, etc., including low-pressure medium and small capacity pumps and high-pressure large capacity pumps.

Many water companies' pumps, chemical pumps in chemical and fertilizer industries, reciprocating pumps, mud pumps in non-ferrous metals and other industries adopt variable frequency speed regulation, which has produced very good results.

10. Frequency converter is applied to crane and Tipper loads

The load torque of cranes, tippers, etc. is large and stable, and the positive and negative are frequent and reliable. The crane and dumper controlled by frequency converter can meet these requirements.

11. Application of frequency converter in wire drawing machine load

The wire drawing machine for producing steel wire requires high-speed and continuous production. The steel wire strength is 200kg/mm2, and the speed regulation system requires high precision, high stability and synchronization.

12. Application of frequency converter in transporting vehicle loads

The effect of frequency conversion technology is very good for raw coal loading trucks in coal mines or molten steel transportation trucks in steel plants. It has fast start and stop, strong overload capacity, and flexible forward and reverse control. All rights are reserved by the engineering network, so that the coal surface is flat and the weight is correct (no more or less loading), and there is basically no need for manual operation, which improves the production efficiency of raw coal and saves electric energy.

13. Application of frequency converter in elevator overhead sightseeing car load

As the elevator is a manned tool, it requires a highly reliable drag system, as well as frequent acceleration and deceleration and positive and negative rotation. The improvement of the dynamic characteristics and reliability of the elevator increases the safety, comfort and efficiency of the elevator ride. In the past, elevator speed regulation was mostly DC, and in recent years, it has gradually changed to AC motor frequency conversion speed regulation, whether in Japan or Germany. Many elevator factories in China are scrambling to equip elevators with variable frequency speed regulation. For example, Shanghai Mitsubishi, Guangzhou Hitachi, Qingdao Fuji and Tianjin Otis all adopt AC variable frequency speed regulation. Many elevators originally produced have also undergone frequency conversion transformation.

14. Application of frequency converter in feeder load

In metallurgy, electric power, coal, chemical industry and other industries, there are many feeders. Whether disc feeders or vibrating feeders, the effect of variable frequency speed regulation is very significant. The disc feeder of the sulfuric acid production line in the dye factory of Jilin chemical company was originally slip speed regulation, with small low-frequency torque, many faults, and often stuck. After adopting frequency conversion speed regulation, because it is an asynchronous machine, it has high reliability and power saving. More importantly, it is closed-loop with temperature transmitter to ensure the accuracy of conveying materials, so as not to cause accidents due to excessive over temperature of oxidant conveying, and ensure the order of production.

15. Application of frequency converter in stacker reclaimer load

Stacker reclaimer is the main equipment for stacking materials in coal yards, wharves and mines, and its main function is stacking and reclaiming. Automatic stacking and semi-automatic reclaiming are realized, which improves the reliability of the equipment. The equipment operates smoothly without impact and shaking. The reclaiming process is 1/cos φ Regular rotary speed regulation improves the efficiency of bucket wheel rotary reclaiming and the uniformity of belt coal transportation, which is very popular with workers.

16. Application of frequency converter in fan load

Fan loads are large-scale equipment, which are widely used in steel mills, power plants, nonferrous metals, mining, chemical industry, textile, chemical fiber, cement, papermaking and other industries. Most of them adopt adjusting the opening of baffle to adjust the air volume, which wastes a lot of electric energy. Adopting variable frequency speed regulation can save electricity and reduce mechanical wear. Copyright of control engineering network is reserved, and the service life of the equipment is extended.

17. Application of frequency converter in mixer load

There are many mixers in the chemical and pharmaceutical industries. Using variable frequency speed regulation instead of other speed regulation methods has many advantages.

18. Application of frequency converter in spinning machine load

The spinning process is complex, with many stations, requiring tension control, and some require position control. The effect of variable frequency speed regulation is good.

19. Application of frequency converter in special power load

Many power supplies, such as experimental power supply and aircraft drag power supply (400Hz), can be completed by frequency conversion device, which has the advantages of less investment, quick effect, small volume and simple operation.

20. Application of frequency converter in paper machine load

The paper machines in China's paper industry, which require high precision, mostly adopt SCR DC speed regulation mode, and some use slip motor and commutator motor. The reliability and accuracy are not high due to the existence of slip rings and carbon brushes. As a result, the papermaking machinery lags behind, and the general speed is only about 200m/min, which is difficult to compare with 2000m/min abroad. Therefore, the frequency conversion of papermaking machinery is the general trend.

21. The frequency converter is applied to the load of washing and ironing equipment

Washing machines and ironing equipment in larger hotels used to adopt mechanical speed regulation or pole changing speed regulation, which can only provide one speed or several speeds, which is not ideal for fabrics that need to be washed and ironed repeatedly. Frequency conversion speed regulation is adopted to greatly improve the efficiency of the washing machine.

22. Frequency converter is applied to music fountain loads

The water level and volume of the music fountain, which is very attractive to tourists, are controlled by frequency conversion.

23. The frequency converter is applied to mechanical loads such as grinding machines

The speed of grinder spindle is very high, and the frequency of power supply is also high, including 200Hz, 400Hz and even 800Hz. In the past, the power supply of spindle motor was mostly driven by medium frequency generator set. If unit has large volume, low efficiency, much noise and poor accuracy.

24. Application of frequency converter in cigarette machine load

Cigarette machines imported from the cigarette industry in the past, whether Molin 8 or Molin 0, are not stepless speed regulation. Therefore, in the cigarette industry, it is mainly to solve the problems of stepless speed regulation and reliability. The technology is simple, the use of frequency converter is simple, and the effect is great.

25. Frequency converter is applied to vibration reduction and noise reduction loads

Many loads, such as large air compressors and medium frequency units, have high noise and vibration. The frequency conversion technology can reduce vibration and noise within the standard.

26. Application of frequency converter in printing and dyeing machine load

Most printing and dyeing machines are multi unit joint working equipment. In the process, all units are required to operate synchronously at the same linear speed and keep the tension constant, otherwise there will be quality problems such as broken cloth, wrapped cloth, uneven chromaticity, insufficient chromaticity, excessive shrinkage and so on. In the past, printing and dyeing machinery used DC speed regulation system whether in common power supply mode or sub power supply mode.

Because of the inherent shortcomings of DC, the printing and dyeing industry has gradually adopted AC frequency conversion technology. The rotary screen printing machine is composed of a cloth feeding unit, a printing unit, a drying room belt guide unit and a cloth dropping unit, which belongs to a complex type of printing and dyeing speed regulation system. Variable frequency speed regulation is adopted to form speed chain control. Good synchronization performance, high precision and high reliability.

27. Frequency converter is applied to injection molding machine loads

Injection molding machine is the key equipment of plastic processing and molding, with large quantity and large power consumption. In the past, most of the power saving methods were converted from △ type (triangle type) to Y type (star type), and the effect was general. Using frequency conversion speed regulation does not change the original structure of the injection molding machine, and controls the pressure or flow of several processes of the oil pump (such as mold locking, mold closing, glue injection, pressure maintaining, demoulding, mold withdrawal, etc.), which can save 20% - 52% of electricity, and better replace the past proportional valve throttling speed regulation method to control the ownership of the engineering network, greatly reducing energy consumption. Many injection molding plants in the Pearl River Delta have carried out frequency conversion transformation. When transforming the injection molding machine, pay attention to the acceleration of mold closing, otherwise the output will be reduced, and pay attention to the harmonic interference at the input and output ends.

28. Frequency converter is applied to environmental protection loads such as sewage treatment

More and more attention is paid to environmental protection, which is related to the environment on which human beings live. As a result, clean energy and green cities have emerged. Variable frequency speed regulation can be used in three aspects of environmental protection loads. The first is industrial sewage treatment, the second is garbage power plant, and the third is the control of industrial smoke exhaust, exhaust and dust removal.

29. Frequency converters are used in glass, ceramics, pharmaceuticals, beverages, food, packaging and other production lines

The production lines of glass, ceramics, pharmaceuticals, beverages, food, packaging, etc. have achieved good results with variable frequency speed regulation.

30. The frequency converter is applied to the load of offshore oil production platform

It is much better to adopt AC motor frequency conversion speed regulation than DC speed regulation in oil drilling, especially in places with heavy sand and dust, because AC motor is reliable. Offshore oil drilling platforms need frequency conversion and speed regulation devices.

31. Application of frequency converter in electric submersible pump loads

Electric submersible pump oil production is a way of oil production. Most electric submersible pumps work in oil wells below 1800m, and most of them use power frequency full pressure startup and constant speed operation, which has the following disadvantages:

Excessive starting current will damage the insulation of the motor, produce impact torque and damage the pump structure; The pump suddenly produces a large suction, which is easy to suck in sand, causing the pump to jam. Moreover, there is no voltage stabilizing system and the underground liquid level fluctuates greatly, causing voltage and current instability, overexcitation and underexcitation of the submersible motor, causing faults.

32. Application of frequency converter in polyester chip load

Polyester chip is one of the main products in the petrochemical industry. Due to the high precision of variable frequency speed regulation, it is easy to control multiple control points, stable and reliable. The use of variable frequency speed regulation can increase the product quality and bring great benefits to enterprises. Many enterprises adopt variable frequency speed regulation technology in capacity expansion