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First test of Hughs 4ft alt.
By Jerry, Section Diaries Posted on Sat May 10th, 2008 at 02:59:46 AM MST
Star is tracking perfect, right on the money.

I joined the alt and the prime driver test motor today. I did a few voltage test to confirm proper output for both star and "Jerry Rigged".
The #s are right on where they should be. Now I can add the fullwave bridge rectifiers and continue with all the other testing.
Here are a few pictures. First I brought the rpm up till the ac voltage per coil is 5v.
These are no load tests. Next I configured the alt star. Star produce 17.2 volts between any 2 connection of 3 phase.
"Jerry Rigged" produced 20 volts on any one of the phases.
Here are the pictures.

This is the 5 volt 1 coil.

This is the star reading.

This is the "Jerry Rigged" reading.
OK, Testing continues.
JK TAS Jerry

First test of Hughs 4ft alt. | 2 comments (2 topical, 0 editorial)

Re: First test of Hughs 4ft alt. (3.00 / 0) (#1)
by electrondady1 on Sat May 10th, 2008 at 08:14:38 AM MST
(User Info)

jerry,
using this construction method,
how do you set the mag/ coil clearance.
on one of the photos there were a few paint stir sticks laying around.
i am guessing that you fix your stator tight to the speaker chassis and then set the rotor position using some spacers and then lock it in place with those collars?

Re: First test of Hughs 4ft alt. (3.00 / 0) (#2)
by Jerry on Sat May 10th, 2008 at 10:15:21 PM MST
(User Info) http://www.dplusv.com/Photo-03.html

There are 2 alin set screws on the shaft to hub adaptor. I just slide the rotor to the desired position the tighten the set screws.

Yes the stator is secured to the speaker basket.

I did some no load DC voltage test today.

I ran the rpm up till one coil mesured 5 volt. This happened at 492 RPM.

In star at this RPM dc output is 22.5 volts. In "Jerry Rigged" the voltage is 25.5.

I think the real diferance will show up under load. There is a allmost sign wave shape on the scope.

JK TAS Jerry

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First test of Hughs 4ft alt. | 2 comments (2 topical, 0 editorial)

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