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Please help me understand electrical power | 13 comments (13 topical)
Re: Please help me understand electrical power (3.00 / 0) (#2)
by rfrink on Wed Jul 01, 2009 at 02:55:52 PM MST

Thanks Bruce!  I don't have an amp meter that I can hook up in series. For an amp meter, I just have an inductive clamp type for AC lines.

OK..I looked up the head lights. They are Sylvania H6024, 55 watts ea. as I burned them.

Their brightness depended on the rotor speed...at the slowest ~70 rpm..they are yellow and at the fastest that I ran, ~120 rpm...they were dazzling white. (real technical stuff here :)

Here's a few reading that I took with 2 headlights hooked up:

At 70 rpm: AC voltage across the 3 legs at "A" measured 4.1V per leg with a current of 1.5A per leg.  The DC voltage at "B" measured 4.4VDC.  

At 80 rpm: AC volts at "A" measured 5.0 VAC at 2.2 amps per leg and teh DC voltage at "B" was 5.5 VDC.

The AC current was measured with an inductive type clamp on meter.

I left it running for about 30 minutes.  The stator and recifiers were just a little warm..not much heat...but I stsrted to notice some oozing liquid around a coil in the polyester resin....not sure what it was...then I think saw some discoloring in the resign from random "hot spots" in the coils. So I shut everything down.

Oh yeah...here's my open DC voltages:

-Rob


[ Parent ]



Re: Please help me understand electrical power (3.00 / 0) (#3)
by wooferhound on Wed Jul 01, 2009 at 04:47:37 PM MST

I think you are missing a very important part in your circuit to make measurements. I would put a large capacitor across the 'B' connection points, something bigger than 10000 microfarad, more is better. The DC voltage at that point is a dirty spikey unsmooth power that will lead to incorrect readings. In your earlier post you mentioned that you hooked up an inverter to this setup, I am actually surprised that it functioned at all operating from this dirty power. The capacitor will not be needed when you have a battery connected since a battery acts somewhat like a large capacitor.
W o o f -={(

[ Parent ]


Please help me understand electrical power | 13 comments (13 topical)

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