Dec 24, 2006

[RP]

This may be silly but it occurs to me that because of the wide shoes and narrow gaps on the stator, your magnetic field kind of "smears" from one shoe to the next.  I wonder if you'd get a faster magnetic "flip" on the shoes if they were narrower with larger gaps between them.

To test this you'd have to sacrifice a stator by chopping off some of the side material on the shoes.  For example you could take off the shaded pole wing on one side of each shoe.  Part of me says this would help but the other part says it'll only change the wave shape to have higher peaks but same overall power out.

One other idea:  Is the shaft long enough to support two stators side by side?  You'd sacrifice some blade hub shaft length but maybe you could press the rotor down the shaft a little and gain some more coil length.

[Spdlmt150]

I considered narrowing the stator a bit. The problem there is cutting the laminate shorts them out & I didn't want to put that kind of work into this motor. In all honesty, I don't think it would have much of an effect unless there were more magnets.

I did consider stacking laminates. I may still try it later on. I will have a bunch more of these motors coming, and I could make a custom shaft to stack 6 laminates which would provide 3 inch long runs of wire. Might as well go to a standard motor.

[Spdlmt150]

225 turns of 25 gauge wire per tooth checks around 16-18vac per pair at just over 1000 rpm and throws quite a spark when shorted out. Rewinding this motor is not a fun task with my fat fingers. The tape over the coils is to hold the leads in place while I'm winding. One more to go.

As soon as it's putting out dc I'll post some real numbers.

[Spdlmt150]

After trying delta, jerried, and star... The lakewood works out best wired star with the center brought out & rectified (4 lead star). Wired as such running 500-600rpm it put out 2.8A to a dead short, and was pushing .8A into a battery. This was the highest readings I have managed from it.

[Spdlmt150]

The completed lakewood box fan mini mill. 2.8 amps short circuit. 12v cutin around 500 rpm. Very low budget.

225 turns per tooth 25 awg salvaged wire. 4 neos. Wired 4 lead star. Two rectifiers mounted inside the can, 2 leads coming out. It is definitely not a powerhouse mill, although it is small, lightweight, and can actually generate a couple amps of useable power for very little invested.

It will soon be getting a 3 foot 3 blade rotor bolted onto an aluminum hub. Probably a 1/4 inch headphone jack for slip rings.

[RP]

Nice work!  If you really want slip rings for the yaw motion, you might consider a small alternator from an auto scrap yard as your yaw bearing.  It has a nice pair of slip rings built it in, ball bearings for yaw and it's reasonably weatherproof too.