Heat dissipation of inverter

If you want to use the transducer correctly, you must seriously consider the problem of heat dissipation. The failure rate of the transducer increases exponentially with the increase of temperature. The service life decreases exponentially with the increase of temperature. The ambient temperature is increased by 10 degrees, and the life of the converter is reduced by half. Therefore, we should pay attention to the question of heat dissipation. When the inverter works, the current flowing through the inverter is very large, and the heat generated by the inverter is very large, so we can not ignore the effect of its heating.


Generally, the frequency converter is installed in the control cabinet. To know the approximate calorific value of a frequency converter, you can use the following formula: the approximate calorific value = the converter capacity (KW55 [W]) here, if the converter capacity is 150%*60 of the overcurrent capacity based on a constant torque load, if the converter has a DC reactor or a communication reactor, but also in the cabinet, then The heat will be greater. The reactor equipment is better in the front and the top of the inverter. Budget: Inverter capacity (KW60 [W], since the hardware of each inverter manufacturer is almost the same, so the above can be used for all brands of products.

Note: If there is a brake resistance, because the brake resistance has a large heat dissipation, it is best to isolate the device from the inverter, such as installed on the top or side of the cabinet. Then, how to reduce the heat generated in the control cabinet? When the inverter is installed in the control cabinet, the problem of the calorific value of the inverter should be considered. According to the increase of the calorific value in the cabinet, the size of the cabinet should be increased appropriately.

Therefore, to minimize the size of the control cabinet, it is necessary to minimize the heat generated in the cabinet. If the frequency converter is installed, the radiator part of the frequency converter is placed outside the control cabinet, 70% of the heat generated by the frequency converter will be released to the outside of the control cabinet. Because the large capacity inverter has a large amount of heat, it is more effective for large capacity inverters.

The isolating plate can also be used to separate the body from the radiator, so that the heat dissipation of the radiator does not affect the converter body. The effect is also very good. Frequency converter heat dissipation design is based on the vertical device, the horizontal radiation will become worse! About the cooling fan general power slightly larger frequency converter, all have cooling fans. At the same time, it is also recommended to install cooling fans on the control cabinet. The inlet should be added with filter screen to prevent dust from entering the control cabinet. Pay attention to the fans on the control cabinet and inverter.


In addition, we should pay attention to the following two problems of heat dissipation.

At altitude above 1000m, the air density decreases, so the cooling air volume of the cabinet should be increased to improve the cooling effect. In theory, frequency converter should also consider capacity reduction, 1000m per-5%, but in fact, because the design of up-converter load capacity and heat dissipation capacity is generally larger than the actual use, so it also depends on the specific application. For example, in the 1500m area, but periodic loads, such as elevators, do not need to be lowered.

2 switching frequency: the heating of the transducer mainly comes from the moment when the IGBTIGBT heating is concentrated in the opening and closing. Therefore, when the switching frequency is high, the calorific value of the natural frequency converter increases. Some manufacturers claim that reducing the switching frequency can expand the capacity, which is the reason. OMRON inverter first agent company.