From the current inverter structure analysis, the heat can generally be divided into the following three: natural cooling, convection cooling, liquid cooling.
1, natural cooling
For small capacity inverter generally use natural cooling (Figure 1a), the use of the environment should be well ventilated, no easy adhesion of dust and floating objects. Such drive drag objects and more for home air conditioners, IChuang / "target =" _blank "class =" relatedlink "> CNC machine tools and the like, power is small, the use of the environment is relatively good.
Another way to use natural cooling inverter capacity is not necessarily small, that is, explosion-proof inverter. For such a small capacity inverter can use the general type of radiator can be required to heat the area within the allowable range as large as possible, the heat fins spacing smaller, as much as possible to increase the heat radiation area. For high-capacity explosion-proof inverter, such as the use of natural heat dissipation recommended heat pipe radiator. Heat pipe radiator is a newly emerging radiator in recent years, it is a combination of heat pipe technology and radiator technology, its high thermal efficiency, the capacity of explosion-proof inverter can do relatively large, up to hundreds kVA. This radiator is relatively ordinary radiator, the difference is relatively large size, high cost. This cooling method and water cooling compared to still have advantages: Water cooling to use water-cooled devices, water-cooled radiators and essential water circulation system, etc., the cost is higher than the heat pipe radiator heat dissipation. The industry reflects the heat pipe radiator performance, it is worth promoting.
Another way of natural cooling is "through the wall," the natural cooling, this cooling way up to reduce 80% of the heat, which is characterized by the inverter body and heat sink completely separated by the electrical control box, greatly improving the inverter Device cooling effect. As shown in Figure 1b. The biggest advantage of this cooling method is that you can do a regular clean radiator, and to ensure that the protection level of electric control box to do more. Like a common cotton textile enterprises due to too much cotton, often easy to block the inverter air duct, leading to overheating inverter failure, through natural cooling through the wall can be a good solution to this problem.
2, convection cooling
Convection heat dissipation is a commonly used method of heat dissipation, as shown in Figure 2. With the development of semiconductor devices, semiconductor device heat sink has also been rapid development, the trend of standardization, serialization, universal; and new products to the low thermal resistance, multi-function, small size, light weight, suitable for automated production and installation The direction of development. Several major radiator manufacturers in the world, the product up to thousands of series, and all have been tested, provides the use of power and heatsink thermal curve, for the user to provide an accurate selection of the convenience. At the same time the development of cooling fan is quite fast, showing a small size, long commissioned, low noise, low power consumption, wind capacity, high protection features. Such as the commonly used small power inverter cooling fan only 25mm × 25mm × 10mm; Japan SANYO long life fan up to 200000h, protection class up to IPX5; more German ebm large wind axial fan, exhaust volume up to 5700m3 / h. These factors provide designers a very wide choice of space.
Convection heat dissipation is precisely due to the use of the device (fan, radiator) the 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 (to take unit parallel mode) was wide For adoption.
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