Motorcycle generator as BLDC?

[bearing]

What do you think about making a motor by stacking some motorcycle stators together and making a rotor with neodymium magnets?
You can get the stators cheap on ebay or from junkyards.

Are there any stators with good enough steel laminations?

[spinningmagnets]

Otherpower.com is the best site for DIY off-grid generation. Their chat forum is "fieldlines". Whether wind, hydro, or back-up generator,...there has been a lot of adaptation in the past. You may get the most relevant responses in the "other" section (back-up generators, etc). Best of luck...

http://www.fieldlines.com/

[c_a]

In my opinion this OEM shit is not worth any $ or €.

The OEM parts have very thick plates and a very bad efficiency...

[bearing]

Yeah, it seems like most of them have thick laminations. My thinking/dreaming was that maybe there has been made one or two stator models made in the past (when engineers designed the parts, not the economists) that could turn into powerful cheap motors.

Otherpower.com is the best site for DIY off-grid generation. Their chat forum is "fieldlines". Whether wind, hydro, or back-up generator,...there has been a lot of adaptation in the past. You may get the most relevant responses in the "other" section (back-up generators, etc). Best of luck...

http://www.fieldlines.com/

Thanks, I'll take a look.

[Miles]

Yeah, it seems like most of them have thick laminations. My thinking/dreaming was that maybe there has been made one or two stator models made in the past (when engineers designed the parts, not the economists) that could turn into powerful cheap motors.

Some of the Denso ones look promising...

[liveforphysics]

Rather than stacking them up, just finding a good Denso alternator is a decent option. Remove the diodes obviously, and use a brushed motor controller to set the field (no magnets needed, and variable KV).

[grindz145]

X2 the alter-motor idea has been done and done well, and there are definately some benefits and doing do.

[spinningmagnets]

Heres some previous threads with links, might prove useful to scroll...(17 pages worth, I don't have any experience with altermotors...been waiting for someone else to work the bugs out and post a tutorial).

"The "Altermotor" (A Build Thread)"....posted by modern_messiah
http://endless-sphere.com/forums/viewtopic.php?f=30&t=31015

[salty9]

Rather than stacking them up, just finding a good Denso alternator is a decent option. Remove the diodes obviously, and use a brushed motor controller to set the field (no magnets needed, and variable KV).

http://www.rcgroups.com/forums/showthread.php?t=1123956&highlight=reem

claims 3700w produced at 2400 rpm using Denso alternator with original rotor. Note that this is using RC controllers

[spinningmagnets]

Great link, salty9. Alternators of all sizes are readily available and cheap as used. He states a custom-made permanent magnet rotor is more efficient (no battery juice used to power the rotor), but using the existing rotor does allow field-weakening (as LFP suggested) so the field strength could be tailored for max torque or low cogging drag (perhaps automatically by an electronic box, RPM-based? throttle-current based?).

"...2200 RPM. This is where the motor peak efficiency is for 1000W output power. The 1000W power level is of interest to some e-bike people..."

I've always liked the form factor of alternators, the size (and built-in fan) is good for absorbing and shedding heat. He suggests that the larger and common "Chevy truck" Delco alternator would have 5 times the torque (E-scooter?), but the Denso he is experimenting with (as a large RC-plane engine) is (in his words) half the size. He has looked a great deal for the "best candidate". Proper size, good copper fill, reasonable quality laminations, common, cheap as used...worth looking into?

Sounds like a good replacement for the 80-100 when its out of stock, 2200-RPM could mean a single-stage to a 20-inch rear wheel.

[salty9]

Would be interesting to see what kind of low-end torque you could get with a rotor that doesn't saturate at such a low current.

[Harold in CR]

Look on ebay. Denso Alternators are not expensive, for the most part. Here is an example.

HERE

[bearing]

Are all of them made with the "good" design?

[Harold in CR]

See post below

[Harold in CR]

You would have to find out the model-voltage-amperage, then see what design they have.

Can also email Denso. They are in Tennessee, USA. I just gave an example of possible pricing, used.

You will be looking for an SC model, Lexus, Toyota Supra, etc. Try calling a salvage yard in your area. Seems to be 1993-1996 year models, are pretty common.

[bearing]

Is this Denso good?
http://www.bildelsbasen.se/?link=item&post_id=20294245

I just found a thread where Arlo1 has done just what this topic is about; using the stator from a motorcycle as a BLDC.
viewtopic.php?f=2&t=28748

[Harold in CR]

I don't see any reference to the SC model. However, looking at the close up photo of the name tag, you can see the windings through the ventilation slots. It appears that the windings are all slanted in one direction.

It's very possible this is what you are looking for. I have a photo of a Denso Stator shown below.

Denso.jpg (65.46 KiB) Viewed 252 times