Reactive power - Reactive Generator research from GotoLuc - discussion thread

[poynt99]

Ah man!... things are getting much worse now ... I've got 90 watts out and a negative Mean.

Are you sure this is the right way?

I'm running out of water to cool my resistors

See the scope shot

Luc

Luc,

Please confirm what the MEAN power reading is when NOT inverting CH2.

Thanks.

[poynt99]

So this is what you want to know?

I have shared that 30 watts is the max I can pull out of my gen. Anything above that and the prime mover has to supply more energy in the standard way.

My generator has a 12uf cap for exciter field. Cap connected and prime mover needs about 158 watts to turn gen at 3500 RPM. If I disconnect the exciter cap the prime mover needs about 100 watts to turn the gen head. Prime mover is 3600 RPM max.

Hope this helps

Luc

I see, thanks.

So the gen exciter circuit requires about 60W. I wonder if that 60W increases as the gen is loaded?

So once you start drawing more than 30W from the gen, the motor power indicated on the meter starts to increase as well, and under 30W the motor power remains at a relatively steady 158W?

[Hoppy]

So once you start drawing more than 30W from the gen, the motor power indicated on the meter starts to increase as well, and under 30W the motor power remains at a relatively steady 158W?

So, at this point in the investigation, it would appear that Luc has a system electrical efficiency of around 19% with a fixed load of 15R. This seems rather low, so I imagine that the efficiency should increase to some extent as the load is varied?? Hopefully Luc will plot a loading curve to show where optimum efficiency appears on his setup.

[gotoluc]

Hi Luc
Dose your scope have a USB output?-this is how i take my screen shot's.I then open the saved file on the thumb drive in windows paint,and save as a JPEG.They come out just as i see it on the scope.

Hi TinMan,

I'll give it a try. I was saving it on a USB stick then to computer.

Thanks

Luc

[gotoluc]

Mine does, and I think most variacs do too. Just saying that they can, but yours apparently doesn't.

I'm not using my variac as Isolation transformer. I'm using a real Isolation transformer.

I'm not sure I'm following you there Luc. What are you doing exactly?

What I was doing is using 240v AC through 18uf Series cap through a FWBR in series. The DC of the rectifier is connected to three 12v batteries in series and the 15 Ohm load is connected across the 36v of the batteries.

I made a video demo of it and will soon have it up

Luc