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Blown X1 Mill speed control

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17/02/2010 14:04:12

Don't know if it's possible, but maybe loosing the belt a smidge so it slips under too heavy a load might extend tje life of the IGBT's !

As an aside, I built a 3 phase converter some years ago based on a design in Elektor magazine that was rated 750 watts - but upped it by fitting bigger reservoir capacitors and a lot heaftyier IGBT's. As theyr'e voltage driven, fitting ones with bigger current capacity worked in practice - I chose to ignore (i.e. didn't know enough to make a judgement !) variations in input capacitance, switching speed etc.

I have blown up the odd one since - usually a complete phase goes down and the inverter won't work at all as the current limiter comes in and kills the drive to all the IGBT's.

WALLACE.

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