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Comparative Data I've stared holes in Data over the years, one thing that really helps is to have reference. Some folks may look at the PMG and the initial higher output voltage as being unique to the design, this is not the case. Typical synchronous generators with copper wound fields display similar behavior until the temperature stabilizes. The following generators were run on my new VFD Test Bench, the prime mover is a larger 3 phase motor driven by a programmable 'Variable Frequency Drive'. The load was an electric furnace coil of 11 Ohms. The current was monitored as assurance the loads were identical for the two generators. Sixty One Hz was chosen for generator output and measured by the Kill A WATT instrument. This was verified with a tachometer at the generator shafts. I saw an initial 10.5 amps of current, and 10 amps as the tests were halted.
ABOVE: ST3 Above: PMG you'll notice I made more time for the PMG, but you can see the two generators look VERY similar, especially from the point where the load was placed, and 20 minutes into the test run. PMG performance is no accident, it was a lot of hard work getting the PMG this good. more to follow.. George B.
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