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Update on the update
By wildbill hickup, Section Diaries Posted on Wed Jan 12, 2005 at 01:00:16 AM MST
first induction conversion

OK new data,
Finally got some readings both amperage and voltage on two different loads as well as open.
First, Trivo, confermed I had readings correct with regards to small wire and large wire windings so I may have something wrong, but here goes see what you make of it. Oh ya these are rectified.
Small wire winding:
No Load
350 RPM 14-14.5v
1300RPM 48v
Loaded (headlight)
350 RPM 3.5v 1.7a
1300RPM 15v 3.0a
Loaded (battery)
350RPM .5a
1300RPM 2.7a
Large wire winding:
No Load
350RPM 16.6
1300RPM 58.5
Loaded (headlight)
350RPM 8.6v 2.6a
1300RPM 20.2v 3.3a
Loaded (battery)
350RPM 1.5a
1300RPM 3.5a
That's what I get for readings, not sure about the confused reading as far as wire size goes but I did conferm that I had writen it down correctly.
Also when spinning with drill I notice a very heavy(for lack of a better word) feel in one spot in the rotation. I don't know maybe drag is a better word, but it's a pulse. The more the draw the more pronounced it is. Displayed AC output on ociliscope and all waves seem even. Confermed that rotor is not rubbing stator, so thats not it. May be that the mags are not precisly spaced (as I mentioned I had trouble getting the groups together, but they are very close).
Well that's it, based on these figures can anyone help me with sizing a rotor for this, I do have lots of wind so low speed isn't a problem.
Wildbill

Update on the update | 4 comments (4 topical)

Re: Update on the update (3.00 / 0) (#1)
by Jerry on Tue Jan 11, 2005 at 10:28:35 PM MST

I use 46" to 49" on motor conversion this size. 3 and 4 blade.

I'd sugjest the bar magnets on your next conversion. I think your power will go up and the you can take addvantage of coil reasignment and get even more power.

JK TAS Jerry

Airheads Page

Re: Update on the update (3.00 / 0) (#3)
by wildbill hickup on Thu Jan 13, 2005 at 04:08:13 AM MST

Jerry,

Thanks for the sugestion on the diameter. I guess I'll play with some blades for now (picked up a 6' piece of 8" sewer pipe), that's where I'll start, But when I get fed up and get a little money I'll probably send you an order.

As far as the mags go, they are bar magnets, but they are narrow so I had to use 3 of them for each pole. I picked them up cheap on Ebay once. I don't remember exactly now but I think I paid 20 bucks for 60 of them. their 2 X.5 X.25. Now I wish I bought more.

Thanks again for the info
Wildbill

[ Parent ]

Re: Update on the update (3.00 / 0) (#2)
by baggo on Wed Jan 12, 2005 at 02:26:07 AM MST

Your readings from the two windings are probably correct. I think what Trivo is suggesting is that because the start windings are thinner wire they will have more turns but this is not necessarily true. The start windings do not usually have to carry a great deal of current so can be wound with thinner wire. Your no load readings show that in fact the start windings probably have slightly less turns than the run windings. Of course the higher resistance of the start windings will limit the current they can produce, as shown by the readings under load.

When you are testing each set of windings on its own the output will be single phase and will be 'lumpy' when the rotor is turned. When you connect the output of the two windings in parallel (through their own bridge rectifier) then you will have a 2 phase machine which should run a bit smoother.

John

Re: Update on the update (3.00 / 0) (#4)
by wildbill hickup on Thu Jan 13, 2005 at 04:15:49 AM MST

John,

Thanks for the responce, I thought something might be wrong. I only had one rectifier handy so haven't been able to parallel them yet. Good to know that will smooth out.

[ Parent ]

Update on the update | 4 comments (4 topical)

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