FCMA Soft Starter

http://lmgtfy.com/?q=What+is+the+working+principles+of+FCMA+soft+stater+for+induction+motor+starting%3F

If you really want to be an engineer learn how to think like one...

What an excellent question for a search engine, such as Google, Bing, ask.com, etc.

About once per year, in one forum or another, someone brings this up. Yet it is such a narrowly focused product made by only one company in only one corner of the world, it defies reasoning as to why it comes up with regularity. My suspicion, as always, is that the scratching of this itch is a purposed strategy to keep it showing up on search engines.

Or, perhaps, Chapter Seven becomes the week's subject about once per year.

Broadly the same as Allen Bradley ones.

How it works I don't know, but I can vouch for it. We got one installed 21 YEARS now on a 5kw mixer motor and is excellent. Yep AB for those who noted it!

No, it is nothing like the AB soft starters. FCMA is an acronym for the specific technology used to reduce the voltage to extremely large motors using magnetics, not electronics, by virtue of controlled saturation of a transformer. FCMA means "Flux Compensated Magnetic Amplifier" and is basically an updated version of the old "Mag-Amps" used by GE back in early part of last century up to the 1950s before power electronics (transistors and thyristors) for large motors were feasible or affordable. Once that changed, the Mag-Amp technology was forgotten, until this company in India resurrected it and changed the method by which the magnetic core flux is controlled.

So no, you do not have one of these on a 5kW motor, unless maybe you meant 5kV, and AB has never made one of these, in fact nobody had made them in the developed world for 60 years as a motor soft starter alternative (although Mag-Amps might still be still used for other things).