Quote:
Originally Posted by Eric
very nice! nice idea leaving the grearing all intact, you could refine that motor so the motor spins at a high rpm and the geared down portion could spin up a generator at 1800rpms or so. whats the air gap measured between the existing rotor and stator? are you only running at 12v!? considering your existing air gap, resistance in the gear box, and 12v then 100rpm sounds very good!! oh is that 100rpms before of after the gear box? if your circut can handle it, try throwing 2, 3, or 4 12v batts in series (48v total at 4) and see how fast it spins up. you will probably notice different rpm performance levels if you try a batt, cap, light bulb, and or a block resister on the output wires but yes!! be careful to turn the power off!! when changing the output types, lol i have blown plenty of transistors learning the hard way. also i think you mentioned you were using pots instead of fixed resistors for the bridge on the base of the transistor. you should probably try changing those out to a "matched ohms" set of fixed resistors and see if there is an improvment, i have been told that pots are not as accurate.
i am still waiting for my second motor from a local machine shop. its nearly identical to yours in geomitry. just came out of a weed wacker. the shop is making a new rotor for that one with a 5thousands air gap. he is pricing the clean(virgin?) cast iron at about 10$ a pound. does that sound about right anybody? also i would like to post some videos but my camera only outputs quicktime file types. can anyone recomend a utility i can use to shrink the file size and change the format to mpg?
thanks!
Eric
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Thanks for the encouragement Eric,
The RPMS that I measured this morning was 800-850 RPMS ( on the wheel past the gearing ) at 12.8 V Second charging battery went to 13.14 ( small 10 Amp hour batteries ) I put on some duralube the bearings.
I moved this system over to my auto battery swapper and will give it some time there to see how it stands up to long time swapping.
I am not sure my circuit can handle the extra voltage, I am tempted to try the 40 V to see what the back EMF would be to my golf cart batteries... currently I am charging them at 40V at .8 AMP 2 at a time with my SSG. It would be cool to switch over to this and see what it could do, but for now, I will stick to my small amp hour batteries and just let it run for hours on end..
I did note that my transistors did get pretty warm when I was running this, so I added a heat sync to it. I did kill one transistor when I lowered the pot on one side too low. However keeping the resistance up it has continued to run for several hours now.
I like your idea of making a custom stator for your machine via a CNC shop. I will be most interested in your results of such a tight gap, I do not know the gap that I have on mine. I have considered filling in the gaps on the stator with epoxy to give more momentum and to help cut down on the air resistance
It seems to me it would be more balanced that way as well. But that is just a crazy idea I have.... the right thing to do is to have it CNC, then balanced properly. I did note when I took this apart that it appears that is what they did with this unit, there were small cuts in the metal of the stator I am betting they balanced the stator this way.
a MUST HAVE image utility, I recommend because it is free... and works!
"FastStone Image Viewer"
I use it all the time and have associated all my graphic files to it. Very powerful tool, allows for batch conversion too.
Cheers
