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Forced air cooling of a drive is preferred to natural convection when

  • A.the losses are too large for the available surface
  • B.the ambient temperature is unusually low
  • C.the drive is required to run at reduced switching frequency
  • D.the drive has no dc link capacitor fitted

Answer: A

Moving air over the fins multiplies the heat a given heatsink can remove several times over, which allows a much smaller assembly. The fan is then a wearing part whose failure has to be detected before the devices overheat.

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