wireguy

I have been using National Instruments Labview to drive the FET.  I soldered up an array of four FET's to distribute the power and reduce the amps thru each one.  They seem to run rather cool at full power.  The nice thing about Labview, is that it is very universal and you can set and hold the exact frequency(s) that you desire.  I plan to use the alternator system with a feedback loop to monitor and control the speed of the alternator, while letting the system adjust the voltage to the rotor.  Using a 1 hp 2500RPM permanent magnet 90V DC motor with speed controller(110v AC in, 90V out to motor) to drive the alternator.  I can post a picture if requested.

Hope this helps,
Wireguy