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adric22
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Joined: 06/08/2008
Location: United States
Posts: 47

Posted: 07:44pm 05 Aug 2008

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I got two good sized stepper motors out of an old DLT drive I plan on using for some small-scale wind generators.

Troube is, they have 4 wires comming out. Now, one of them I can tell is some kind of common connection because it is 3 wires twisted together.

Now, I need to be able to charge a 12V battery with these things, but I'm not sure how much power they will generate. They are actually listed as 12V motors on the label on the side.

I took a volt-meter and put it on AC mode and ran it across 2 random wires and spun it by hand (which is not very fast at all) and I got 1.4 volts showing up.

Anyway, can somebody explain, or point me to a diagram as to how I would rectify this to DC?

CraziestOzzy

Senior Member

Joined: 11/07/2008
Location: Australia
Posts: 135

Posted: 12:39am 06 Aug 2008

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Have a good read and look at (link)
...answers all your questions and more in detail.

http://cr4.globalspec.com/member?u=25757

http://www.instructables.com/member/OzzyRoo/

adric22
Regular Member

Joined: 06/08/2008
Location: United States
Posts: 47

Posted: 01:13am 06 Aug 2008

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CraziestOzzy said Have a good read and look at (link)
...answers all your questions and more in detail.

Unfortunately, I had already looked at that page. It doesn't really cover the 4-wire setup (it mentions it, but barely) and so I am not 100% sure how to do it.

Dinges
Senior Member

Joined: 04/01/2008
Location: Albania
Posts: 510

Posted: 04:11pm 07 Aug 2008

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adric22 said I got two good sized stepper motors out of an old DLT drive I plan on using for some small-scale wind generators.

Troube is, they have 4 wires comming out. Now, one of them I can tell is some kind of common connection because it is 3 wires twisted together.

This post didn't make much sense to me initially, it does now (after reading your other story, with the extra information you gave, etc.): what you have is *not* a stepper motor. It's a 3-phase brushless DC permanent-magnet motor.

Rectifying the output is easy. If you leave it wired in star (ignore the star point in that case; don't connect it to anything) connect the three wires (call them R-S-T) to the rectifying diodes like this:

If you rewire the motor for delta, simply wire the 3 outcoming wires to the same points (RST) of the rectifier.

More information:

http://www.windstuffnow.com/main/3_phase_basics.htm
http://www.allaboutcircuits.com/vol_3/chpt_3/4.html
(check out the lower half of that page, 3-phase full-wave rectification)
Edited by Dinges 2008-08-09

adric22
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Joined: 06/08/2008
Location: United States
Posts: 47

Posted: 10:32pm 07 Aug 2008

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yeah, I already got this solved once I realized it was not a stepper motor. I originally thought it was because it had 4 wires going to it.

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