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???
08/28/09 11:54
Modified:
  08/28/09 12:37
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Msg Score: +1
 +1 Informative		 #168587 - go ahead and then cost it
Responding to: ???'s previous message
my friend wants to design a new one

go ahead and then cost it, I'll bet you end up higher than e.g. an ASEA inverter.

Just in case I'll tell you that 1200V IGBTs blow when the inverter is driven from 400VAC, be aware that the spikes etc reqire that the MOSFETS/IGBTs can handle 4 times the AC input voltagea minimum.

the many repairs may simply be due to the MOSFETs being underrated, some 400VAC inverters (from otherwise good companies) came with 1200V IGBTs and blew occasionally.

Erik

List of 29 messages in thread
TopicAuthorDate
AC Motor question            01/01/70 00:00      
   with these questions            01/01/70 00:00      
   More questions            01/01/70 00:00      
      not neccessarily            01/01/70 00:00      
         May be, but...            01/01/70 00:00      
            inverters have a potentiometer input            01/01/70 00:00      
   Replies to Erik and Daniel            01/01/70 00:00      
      go ahead and then cost it            01/01/70 00:00      
         Thanks Erik            01/01/70 00:00      
   Dear Suttar            01/01/70 00:00      
      STAY AWAY            01/01/70 00:00      
         It doesn't have to be so bad if you switch at zero crossing            01/01/70 00:00      
            and give tyhe AC motor every other cycle ????            01/01/70 00:00      
               No ... just turn it on and off at zero crossing            01/01/70 00:00      
                  it is an AC motor, details, details, detalis            01/01/70 00:00      
                     Horrible motor control            01/01/70 00:00      
                     Who said anything about removing cycles?            01/01/70 00:00      
                        on and off at zero crossing....            01/01/70 00:00      
                           and if you cut only half cycles ....            01/01/70 00:00      
                              Nope ... it just happens at power-on and power-off            01/01/70 00:00      
                                 that is NOT what this thread is about            01/01/70 00:00      
                           Only when you turn the motor on or off            01/01/70 00:00      
         To Erik,            01/01/70 00:00      
            Slip            01/01/70 00:00      
               "inverter certified" motors ...            01/01/70 00:00      
            Creating new sine wave at different frequency            01/01/70 00:00      
               Now I know why...            01/01/70 00:00      
            no, the frequency generated by the inverter            01/01/70 00:00      
      Reply to Vu Nhu Khanh            01/01/70 00:00      

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