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Two technologies of frequency converter: frequency conversion technology and microelectronic technology to achieve the purpose of energy saving and speed regulation description

Mar 27, 2021

Two technologies of frequency converter: frequency conversion technology and microelectronic technology to achieve the purpose of energy saving and speed regulation


What is a frequency converter?

Inverter, the English word is Variable-frequency Drive, abbreviated as VFD. There are two types of technologies needed for frequency converters: frequency conversion technology and microelectronics technology. The frequency converter is a kind of electric power control equipment that controls the AC motor by changing the frequency of the working power supply of the motor. The frequency converter adjusts the voltage and frequency of the output power supply by the opening and closing of the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation.

The main components of the frequency converter are: rectifier (AC to DC), inverter (DC to AC), filtering, braking unit, drive unit, detection unit and micro-processing unit.

The inverter has many protection functions, such as over-current, over-voltage, overload protection and so on. With the continuous improvement of industrial automation, frequency converters have also been widely used.

What are the application industries of frequency converters?

As we all know, frequency converters have specific applications in many fields of industrial manufacturing. According to the application experience of the frequency converter, some articles have summarized more than 30 main industry fields, but in fact, it is far more than that.

1 Printing and packaging industry

The printing and packaging industry we are talking about here is mainly the printing industry and the packaging industry. It is one of the most growing industries in recent years. The demand for inverters is very large, such as: wrapping machines, packaging machines, Stackers, conveyor lines, printing machinery, etc. Inverter-driven motors can be well used in the printing and packaging industry to meet the requirements of the production process, and can give full play to the advantages of the inverter, such as reliable, energy-saving and high-efficiency.

2Pharmaceutical industry

In the pharmaceutical industry, we are familiar with mixers, filling machines, pulverizers, washing machines, thickeners, granulators, dryers, mixers, clean air conditioners, etc., and inverters are widely used. The frequency converter has many advantages in replacing other speed regulation methods, which can reduce the pollution to the power grid, reduce the risk of wear, and extend the service life of the blower. The pharmaceutical industry is a big consumer of electricity, and various cooling pumps and circulating water pumps are also used in the production process. The use of variable frequency speed regulation to change the pressure or flow can also achieve power saving, constant current and constant pressure water supply and other effects.

3 Electronic and electrical industry

In the electronic and electrical industry, lithium battery coating machines, 3C coating equipment, stage machinery, photovoltaic stringing machines, etc. are also load-type mechanical equipment that cannot be ignored. The use of vector inverters can provide precise and stable speeds, and even the use of AC inverter central winding technology to control the output torque of the inverter to obtain a stable constant tension control effect.

4Logistics industry

The great development of the modern logistics industry, especially the development of smart logistics technology, has caused various industrial control brands to launch inverters designed for logistics industry applications, mainly for all types of stackers, conveyors, elevators, and shuttles in the logistics industry. Rotor scale, cold storage and cold chain transportation, hoist and other automated product architecture solutions. Use the frequency converter to transport the conveyor belt with variable load, save power consumption, at the same time sense lighter load, adjust the power factor to make the operation more efficient!

5 Textile industry

In the development of the textile industry, the application scenarios of the frequency converter are very obvious. The frequency converter can be used to control the textile industry's winding machines, spinning and carding equipment, chemical fiber metering pumps, clothing cutting beds and other machinery. There are two main types of AC motors used to control textile machinery through frequency converters. On textile machines that do not require high speed adjustment accuracy and have a small speed adjustment range, the Y series AC asynchronous motors are commonly used; on the contrary, the speed adjustment accuracy is high and the speed adjustment For machinery with a large speed range, more AC asynchronous motors of the Y series are used. In the actual application of textile mills, the air-conditioning equipment is controlled by the frequency converter to reduce power consumption and cost; it is also possible to realize the synchronized and coordinated operation of multiple motors through the frequency converter to simplify the mechanism. For example, the roving frame with AC frequency conversion speed control can remove the cone wheel speed change mechanism, which overcomes the problem of slipping and inaccurate speed change of the cone wheel speed change belt.

6 Rubber and Plastic Industry

In the general sense, the feeding equipment is the feeding equipment. The use of frequency conversion speed control to control the vibrating feeder or disc feeder can reduce the phenomenon of material blockage and material jam, and can accurately feed the material, which is indispensable in the automatic flow operation. Most of the feeding machinery used in the rubber and plastic industry adopts frequency conversion speed regulation. Because it is an asynchronous machine, it guarantees the accuracy of conveying materials, high reliability and energy saving, and it will not cause accidents due to excessive conveying temperature. Ensure the orderliness of production.

7Building materials industry

Inverters are widely used in building materials industries such as glass, ceramics, and cement. In the past, most of the building materials industry used DC, commutator motors, slip motors, cascade speed control or intermediate frequency unit speed control. Nowadays, many units adopt frequency conversion control with excellent results. In the brick conveyor/hoist, woodworking sander, tempering furnace conveying system and other loads, using inverter equipment, its operation stability, control accuracy, operation speed, mechanical characteristics and intelligence are incomparable. Sex.

8 Food industry

We know that the food industry is a pillar industry of our national economy, and food machinery is an industry that provides equipment for the food industry. The use of frequency conversion control is mainly used to adjust the working frequency of palletizers, stackers, depalletizers, mills and other equipment, reduce energy consumption, prevent stalls, and realize non-trip operation when restarting. It can start equipment smoothly and reduce The large current generated when the equipment starts directly damages the motor.

9 Water industry

Inverter has a great effect on industrial and agricultural production and various building water supply, drainage, fire protection, etc. It has been widely used in various pump loads, and can realize such as water pumps, oil pumps, reciprocating pumps, sand pumps, and urban Automatic control of drainage pump trucks. The water industry supply and treatment system has always been a major power user with serious energy consumption. According to the process flow and energy consumption characteristics, it is particularly important to use a suitable frequency converter.

From the industries listed above, it is not difficult to find that variable frequency drive technology is very popular in industries such as medicine, textiles, machinery, electric power, light industry, building materials, papermaking, and tap water, covering manufacturing, factories, and general industrial sectors. , To application areas such as logistics facilities, has been used to control many mechanical tasks.

What should be paid attention to when choosing an inverter?

In addition to knowing the application industry of frequency converters, how to choose a frequency converter to improve production efficiency and cost-effectiveness for enterprises? What aspects should be paid special attention to?

The editor's suggestion is that firstly, the requirements of the application industry for the frequency conversion control system should be clarified, and secondly, the functional characteristics and parameters of the frequency converter should be compared. The selection of the frequency converter mentioned here depends on the motor type, voltage, rated current, access to the power supply, and input/output (I/O) requirements.

For example, you need to consider how the motors work, how many motors are there, and are they working at the same time or individually? Is the inverter power value equivalent to the motor power value? For another example, if it is suitable for occasions with high pollution levels in the textile industry (high cotton wool, high humidity, high temperature, etc.), does the inverter keep up with the pace in hardware, structure and software? Be very careful to avoid alarms and burn-out of the inverter.

But often, we find that when choosing an inverter, the price ranks first among the consideration factors (the reason you know).

The leader in frequency converters

The inverter that I want to introduce to you today is oriented to a wide range of industries. For example, in the industry machinery applications we listed earlier, it is very versatile and brings a lot of realizable possibilities to creative machinery manufacturing, OEM industries and end users. Potential efficiency.

Fully compatible mechanical variable frequency drive

Comprehensive skills for machine manufacturing

Various industrial processes and various environments

All kinds of enterprises and even all kinds of users

What are the specific highlights of this inverter?

The editor will announce for you one by one!


Most importantly, SN200G is a reliable high-performance vector inverter, suitable for driving motors on all kinds of equipment. It has a powerful graphical programming function, and distributed process control can also be expanded. The integrated control panel makes debugging very convenient!

If you want to use four words to summarize the main characteristics of this inverter, there is no doubt that it must be safe, efficient, high-energy, and high-yield.