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Delta Dawn
By MelTx, Section Homebrewed Electricity Posted on Tue Feb 22, 2005 at 11:42:33 PM MST
Hard to turn

Hello The other day we had winds about 15-25 mph what a day.I got five gennys on line and was getting a max of 161 open vdc,but only 13.5 vdc into a batt bank @ 5 amps max.I had a bright idea ....wire the double rotor in delta and get more amps.Now you have to get up on it with all 4 feet to turn it.Is that normal for it to be harder to turn? Is there a way to make it turn eaiser and still put out some amps? My thinking gets turned upside down and backwards. Thank you for your help.
MelTx

Delta Dawn | 2 comments (2 topical)

Re: Delta Dawn (3.00 / 0) (#1)
by Ungrounded Lightning Rod on Tue Feb 22, 2005 at 05:43:37 PM MST

Now you have to get up on it with all 4 feet to turn it.Is that normal for it to be harder to turn?

It's normal to be a LITTLE BIT harder to turn - because it doesn't produce perfect sine waves, so certain harmonics are shorted out.

If it's a LOT harder to turn one of these is likely: It's wired incorrectly (probably one phase has its ends swapped), there's a big error in turns count on one coil, or pole-shape layout that makes the generated waveform massively wrong for using a delta connection.

Check for a wiring error first. Open one of the conntections of the delta, spin it at a constant speed, and measure voltages:
- Any series pair of windings should show the same voltage as a single winding. If it shows something a bit under twice the voltage of a single winding, reverse the ends of one coil.
- The voltage across the break in a broken-open delta should be much lower than the voltage across any single winding (though it won't be quite zero).

Re: Delta Dawn (3.00 / 0) (#2)
by Nando on Fri Feb 25, 2005 at 02:23:45 PM MST

You have shorted the windings, by changing to Delta or Star the energy needed would be the same.

Regards

Nando

Delta Dawn | 2 comments (2 topical)

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