Abstract
Numerical study is conducted to evaluate the heat sink performance in a commercial welding machine, and it is found that the existing heat dissipation scheme satisfies requirements properly. For compactness design purpose, 4 types heat sink are proposed, their thermal performance and pressure drop are numerical studied. It is found that, the maximum temperature of IGBT in heat sink A and D is less than temperature limit 423K with pressure drop of 65Pa and 178 Pa, respectively. Heat sink A reduces the occupied space by 70% and the weight by 49%. For heat sink D, however, the volume is reduced by 20% while the weight can be reduced by 6% only. If the circuit can be modified, the volume of heat sink D can be reduced by 70% while the weight by 50% for the same heat dissipation capacity. The most satisfactory compact design must consider both heat dissipation and circuit requirements.
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