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How to choose the cooling mode of the inverter

The frequency converter as a converter in the running process to produce a certain power consumption. As the use of different devices, different control methods, different brands, different specifications of the inverter generated by the power consumption is not the same. (Axial fan) data show that the power consumption of the inverter is generally 4 to 5% of its capacity. Which accounted for about 50% of the inverter, rectifier and DC circuit about 40%, control and protection circuit for 5 to 15%. The 10 ° C rule indicates that the device's reliability doubles when the device temperature is reduced by 10 ° C. It can be seen how to deal with the heat dissipation of the inverter, reduce the temperature rise, improve the reliability of the device, thus prolong the service life of the equipment and how important it is to serve the society.

Classification of heat dissipation
The heat dissipation of the inverter is divided into the following: natural cooling, forced air cooling, water cooling.

1, natural heat
For small capacity inverter generally use natural cooling method, the use of the environment should be well ventilated, no easy to attach dust and floating objects. This type of inverter drag the object mostly for home air conditioning, CNC machine tools and the like, the power is very small, the use of the environment is relatively good.

Another kind of natural cooling mode using the inverter capacity is not necessarily small, that is, explosion-proof inverter. For such a small capacity of the inverter can choose the general type of radiator can be required to heat the area within the allowable range as much as possible, cooling fins smaller pitch, as much as possible to increase the heat radiation area. For large capacity explosion-proof inverter, such as the use of natural cooling method recommended the use of heat pipe radiator. Heat pipe radiator is a new type of radiator in recent years, it is heat pipe technology and radiator technology combined with a product, its high thermal efficiency, explosion-proof inverter capacity can be done relatively large, up to several hundred KVA This kind of radiator relative to the ordinary radiator, the difference is that the volume is relatively large, high cost. This cooling method is superior to the water cooling method (discussed later): water-cooled use of water-cooled devices, water-cooled radiators and essential water circulation systems, etc., the cost of heat dissipation than the use of heat pipe heat sink. The industry reflects the heat pipe radiator performance is good, worthy of promotion.

2, forced air cooling
Forced air cooling is a commonly used way of cooling. With the development of semiconductor devices, semiconductor device radiator has also been rapid development, tend to standardization, serialization, generalization; and new products to low thermal resistance, multi-functional, small size, light weight, suitable for automated production and installation And so the direction of development. The world's major radiator manufacturers, products up to thousands of series, and all tested, provides the use of power and heat sink thermal resistance curve for the user to provide a convenient selection. At the same time the development of cooling fan is also quite fast, showing a small size, long life, low noise, low power consumption, high air volume, high protection features. The Forced air cooling is due to the use of the device (fan, radiator) choice is relatively easy, the cost is not too high, the inverter capacity can be done from tens to hundreds of kVA, or even higher (take the unit parallel way) was Widely used.

3, water cooling
Water cooling is a more common way of industrial cooling. This device is very small because of its high cost, bulky, and then the capacity of the general frequency converter in a few kVA to nearly 100 kVA, the capacity is not great, it is difficult to cost to do so The degree of acceptance by the user, only in special occasions (such as the need for explosion) and the capacity of the inverter is particularly used in this way.

4, summary
No matter what kind of cooling method, should be based on the capacity of the inverter to determine its power consumption, select the appropriate fan, and the appropriate radiator, to achieve excellent value for money, but also the inverter should be used to take full account of environmental factors To. For the environment is relatively poor (high temperature, high humidity, coal, oil, offshore platform), you must take appropriate measures to ensure the normal and reliable operation of the inverter. From the inverter itself, should be avoided as far as possible the impact of unfavorable factors, such as for the impact of dust, sand can be sealed, only the radiator duct and the outside air contact, to avoid the impact on the inverter; for salt spray, Humidity, etc. can be insulated parts of the inverter coating; field operation with the inverter to add protection, so that rain, sun, anti-fog, dust; for high temperature and humidity environment can increase air conditioning and other equipment for cooling dehumidification, to The inverter has a good environment to ensure reliable operation of the inverter.

Discussion on Radiator 's Radiator Effect and Selection Principle
Data show that the radiator surface by electrophoresis painted black or anodized black, the heat in the case of natural cooling can be increased by 10 to 15%, in the case of forced air cooling can be increased by 20 to 30%, electrophoretic paint After the surface pressure up to 500V ~ 800V.

So in the choice of radiator and the development of processing technology, the radiator for the above process will greatly improve their own cooling capacity, but also can enhance the insulation, reducing the improper installation due to the creepage distance is too small, the gap is not enough To the adverse effects.

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