| Author | Message | ||
     Benm2 |
I'll try this in a new spot. These are pictures of an alternator I made for my M2. With the cut-out primary drive sprocket, the sprocket and rotor shown here weigh less than a stock primary sprocket. It's strictly prototype, just ridden around the block & on the dyno. Should have a trackday on it shortly.   The whole new rotor will fit inside the stock rotor, with about 1/2" to spare. What do you all think? I'm really interested in any feedback or comments you might have. Ben | ||
| Bomber |
power output compared to stock? wieght compared to stock? longevity (which you cant' answer yet, I understand) | ||
| Benm2 |
Less power than stock, seems to be about 2/3. This rotor weighs less than 1 lb, the stocker is around 4 lb (haven't weighed it on a good scale, but I know what mine weighs from volume calc's). The Stator is also about 1/4 the weight of the stocker. This one was designed for track bikes, a street version would have to be a little bigger to match the output. So far, longevity testing has amounted to about 20 minutes. There are sooooo many things that could affect that, and I'll have to hammer them out as they happen. | ||
| Blackbelt |
Hay Benm2 that is sweet man. Hope it works out good. i appriciate that idea more now that my stock stator just blew out a couple weeks ago.. good job man, looks great...keep us up to date on the progress w/ it | ||
| Road_thing |
Interesting project. How'd you make the field pieces for the stator? Got a picture of just the rotor? Thanks! rt | ||
| Benm2 |
The stator is made the same way as the stocker, a laminated stack. The coils are hand wound. I've got a picture somewhere of this rotor inside the stocker, I'll see if I can dig it up. | ||
| Benm2 |
Rotor, before I glued the magnets in, next to a stock rotor  It DOES fit inside the stocker, trust me. | ||
| Sportsman |
On the track, there is a huge difference when the rotor is removed. That's why most sprint guys remove the tonnage and hook up the battery charger every time it's shut off. BUT WHAT A PAIN IN THE BUTT! Ben, I looked for something like that years ago to no avail. Did you check to see if XB stuff is similarly overweight? If it is, I would believe there is a market. Good Job, best of luck | ||
| Benm2 |
Sports, thanks for the compliment. It's always nice to get some positive feedback! I'm not certain that the XB parts are much lighter, but I really doubt that Buell used the same types of components I did to make this one. I had the liberty of NOT worrying about what the affect would be on the overall cost of the bike, in a place where most people wouldn't look. I'd be curious to know, though. Has anyone seen an XB alternator? Is it the same size as a tuber's? I had originally looked for a racing alternator too, and had the same results. I also remember your comment that removing the rotor made a big difference. It seemed that racing alternators were a dime a dozen for the 600 supersport crowd, and they didn't look that hard to make. So, I decided to try making my own. I learned two important things so far: electricity is fascinating and I really don't know much about it. Learning about how an alternator is made, and what materials are available was really interesting (for an engineer, anyway). BUT it does work...so far.... | ||
| Wyckedflesh |
Ben if you can give me a few dasy to try and get caught up I will see if I can snap pics with a measured straight edge of an XB stator for you. | ||
| Benm2 |
Wyked, thanks. I can wait as long as it takes, its taken 6 months to get here! I'll take any input / help I can get! Ben | ||
| Fullpower |
very cool ben,that damn sure took a lot of rotatin inertia out of the equation, gonna spool up way lots quicker, expect a bit more compression braking also. very very nice. | ||
| Benm2 |
It has survived its first trackday! I'm still slow as hell, but the bike ran great! | ||
| Spike |
Sorry to drag up an old thread, I was just curious if there was any news about this stator. Mike L. '04 XB12R | ||
| Benm2 |
Updates: 1. Aluminum rotor failed at second trackday. Adhesive failure of magnet to rotor, ultimately due to assembly (my fault). 2. New rotor made from steel. Magnetic properties better (more power) and less difference in coefficients of thermal expansion. Also, special surface prep used on new rotor for better bonding. New assembly on test bench, makes PLENTY of juice. Waaaay more than the aluminum rotor. In fact, I blew up the capacitors on my rectifier circuit (oops!).  Also, here's a picture of the latest rotor on the test rig.  | ||
| Reepicheep |
Cool! When those big cap's go, it makes a heck of a POP, don't it! Nice work! How complicated is the winding pattern? | ||
| Benm2 |
Yeah, the pop & smoke were a little disturbing. I think I had a brain fade moment and had hooked them up backwards. The winding on this one is very simple, its single phase, so they just alternate winding direction around the outside. I've got an idea for a three phase that might be a little smaller; I'll be working on that next. Ben |
