Three phase semi converter drive

  • The circuit diagram of 3 phase semi-converter feeding a separately excited dc motor is shown in the figure.
  • Shown in the figure, the field winding of the motor is also connected to the three-phase semi-converter. 
  • This drive offers one quadrant operation and is used up to about 115 kW ratings.

Figure - 3-phase semi converter feeding a separately excited dc motor



For converter 1,     V0  = V t  = 3Vml/2∏ * (1 + Cos  ɖ  )  for 0 <  ɖ  <  ∏

For converter 2,    Vf   = 3Vml/2∏ * (1 + Cos  ɖ1  )    for 0 <  ɖ1 <  ∏