Medium voltage drive/starter




  • Starter: Eaton
  • Drive: Yaskawa MV1000
  • Motor: Teco-Westinghouse


In this project, we commissioned a 2400V, 4000 Hp drive/motor unit. The drive was a 2500 Hp which was used to start the motor and then the drive synchronized in phase and amplitude with the mains to transfer to the starter.

Benefits of this system:

  • Minimize the starting current
  • Redundancy in case of starter failure
  • Possibility to start the motor quickly after a stop since low current at start-up
  • Following a loss of power, possibility to fly-catch the motor before it stops and restarts


Jacmar designed this system and tests were carried out under our responsibility at Yaskawa in Chicago with the drive/starter/motor assembly.