Sfor starters vs variable frequency drives

[ters]

I’m trying to make a comparison between soft starters and variable fequnecy drives for a hoisting application – a 40 kW motor will be operating a vertical water gate through a warm gear driving two large screws. What would be major advantages/disadvantages of both options for the given application? Thank you for any advice.

 

[davidbeach]

This has been discussed several times here and on the Electric motors & motor controls engineering forum. The presence of the worm gear will affect some of the discussion regarding braking and holding.