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???
08/30/09 06:57
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 		 #168611 - To Erik,
Responding to: ???'s previous message
Erik Malund said:

An AC motor that is not running synchronous to the input frequency generates an awesome amount of heat.Erik

I am not an expert in AC Motors, but your statement has confused me. Do you mean the "input frequency" as the Mains Supply Frequency?

Does the AC Drive control the AC Motor relative to the mains frequency?

I have been reading and referring to AN984 from Microchip, and various other AC Drive manuals. But most of them have a common block diagram.

Mains Filters -> AC-to-DC bridge -> Controller with Display/Keyboard/Mem/etc. -> DC-to-AC Inverter with filters.

But none of them take any reference signal from Mains frequency.

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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