From: tkoenig@netcologne.de   
      
   David Brown  schrieb:   
      
   > And whenever you have a frequency inverter, the input to the frequency   
   > is first rectified to DC, then new AC waveforms are generated using PWM   
   > controlled semiconductor switches.   
      
   If you have three phases (required for high-power industrial motors)   
   I believe people use the three phases directly to convert from three   
   phases to three phases.   
      
   The resulting waveforms are not pretty, and contribute to the   
   difficulty of measuing power input.   
      
   [...]   
      
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