VFD Cooling solution
VFD is a kind of power control equipment which USES frequency conversion technology and microelectronic technology to control ac motor by changing the working power frequency of the motor. It is mainly composed of rectifier (ac to dc), filter, inverter (dc to ac), brake unit, drive unit, detection unit and micro-processing unit. VFD relies on the cut-off of internal IGBT to adjust the output power supply voltage and frequency. According to the actual needs of the motor to provide its required power supply voltage, then achieve the purpose of energy saving, speed regulation.

The heat dissipation of VFD has great influence on its performance and working life. A good heat dissipation solution for the VFD is undoubtedly important, especially in the case of fierce competition, good heat dissipation can improve the quality of the VFD and enhance the competitiveness. TONGYU Thermal provides advanced heat dissipation technology and service to many VFD manufacturer for many years, provides customized heat dissipation solutions for the customer VFD products, also provides effective thermal simulation, thermal testing and other technical support, escorting for the stability play of VFD products’ performance.
IGBT model simulation schematic diagram and parameters
On the left is Infineon FF600R17 internal structure and heating element schematic diagram, total power: 660W, assuming that the thermal conductive medium is 0.2mm thick 7762 thermal conductive paste.
Temperature simulation sketch of winding
Radiator parameters:
           Substrate size:230*320*14mm;
             Bonding fin: Thick15mm, High72mm;
             Shorter fin: length 210mm,offset 5mm,17fins;
             Longer fins: length:320mm, 18fins;
             Total 35fins
             Heat pipe parameters:
             D9.5 Heat pipe;
             Embedded tube is embedded on the bottom of heat dissipation base plate; 6pcs,pitch 12mm;
             Epoxy resin bonding: K>=4W/m*K
Simulating sketch of velocity diffusion degree of module intake airflow
Minimum airflow:669.5m^3/H Maximum airflow:703.1m^3/H
Simulation results of heat dissipation of converter module model and schematic diagram of fan working point
Temperature Diffusion of Cross Section in Inverter Radiator (Minimum Flow Module)
(Minimum airflow value:669.5m^3/H,Pressure value:197.1Pa.)
Temperature simulation sketch of winding
Temperature simulation sketch of winding
 Max Temp

H.S Ma


Diode case temp


IGBT Internal Core Devices Maximum Node Temperature(℃)
Max Junction Temp.
NTC temp. #1 NTC temp. #2 NTC DT #1 #2
H.S. with H.P. 91.6 41.6 89
88.9 90.1 1.2 107.7 108.9
The ambient temperature is:50⁰C;Suppose 7762 heat conductive paste is used. 0.2mm.
Has a complete integrated service system: including the early engineering and technical personnel to quickly answer the technical advice, to respond to your needs, to develop suitable products for you, to provide reasonable and reliable advice;Commitment to product quality, delivery time, to provide specific cooling solutions.We will continue to strive to provide you with the best quality products and services.
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