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Reducing the thermal resistance from case to heatsink is achieved by

  • A.increasing the switching frequency of the inverter
  • B.raising the dc link voltage of the drive
  • C.reducing the size of the heatsink fins
  • D.using thermal interface material and correct mounting torque

Answer: D

Air is a poor conductor, so the microscopic gaps between the two flat surfaces dominate unless they are filled with paste or a pad and the module is clamped evenly. It is a routine assembly step that is easy to get wrong.

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