How To Parallel Single Phase Generators

I want to install 3 single phase 35KW generators so that one or two( when required) are normally operational and the third is for back up.
I did have a supplier who now says that they cannot parallel them.

Could this be correct and if not do you recommend where I could go to buy one ?
Given that we have a small amount of knowledge, could we build a manual paralleling unit?

Why single phase? because when the govt give us the supply we can move each gen to individual site huts so that single phase AC,s can be run easily.
Terry

Eddy Current Drive For 20kw? Motor

Some years ago I bought an extruder with an eddy current variable speed control fitted. However as I wanted maximum RPM from the motor I removed the Eddy drive complete and replaced it with a direct coupling with the motor on SD starting which has worked well. However Ive now striped the extruder down and will rebuild it.
My question is should I use the Eddy drive on another application and buy a replacement motor. Or should I consider the drive to be obsolete as Ive not seen any others on any other units that I have looked at.
Are Eddy drives efficient?
Thanks
Terry

Power Factor Correction

Before I start let me tell you that I am not an expert in PFC so had to listen when when my factory was visited recently by a group of experts from UK who suggested many things that I could do to increase efficiency and one of their suggestions was to fit Power factor correction to the factory supply, so I started to read a little and understood even less than a little.
What I can say is that I use inverter drives on nearly all of my machines because I need to vary the speed of rotation as well as the direction of rotation of my equipment every few minutes. Actually every 3 minutes when we are cooking. So as I see it PFC is not possible on those machines. Am I correct?

I then looked at one of our machines that is Star/Delta start and runs at a stable speed and load which is another thing that most of my machines don't do.

This particular machine motor, an extruder, has the following specs.
Motor rating 380v 3 phase, 50 htz, 30 kw, 58.2 amps rpm 1454.

Measurements taken with the motor running with no drive belts connected
395v, 23amps rpm 1500

and with the motor running with my connected load

395v, 37.6 amps rpm 1480


The ambient temperature at this time of year ( I live in Qatar) is approximately 49 degrees centigrade in the middle of the day at which time the motor is to hot to touch for more than a few seconds. But runs for at least 12 hours a day and sometimes 24. Which is why I cannot load the motor or gearbox ( which is water cooled) any higher. I did run at about 45Amps for a few hours ( using different pulleys) but the gearbox started to overheat and that was during the winter.

I pay approximately 0.08 Qatar Ryals (0.022 USD) per KWHr. There are 3.65 QR per USD.

Do you think that PFC is going to be beneficial to me??