Alternator Motor - Thee itch I need to scratch

Dee Jay

Dee Jay

100 kW
Joined
Dec 11, 2007
Messages
1,211
hhhmmm

$139 ESC
$269 DC540 alternator
$40 two cogs
$ misc?

WOW for just $600 (batteries not included) I can build a kick ass Delco Alternator Ebike! Thanks to BobDiode (aka Randy) for letting the cat outta the bag!file.jpg http://www.diyelectriccar.com/forums/showthread.php/ebike-alternator-motor-diy-30531p2.html

I'm gonna upgrade my Revive. Woo HOO! :twisted:
 
anybody know what the triangular pieces of steel are for?

Just for looks, I suspect :roll:
 
anybody know what the triangular pieces of steel are for?
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They are the claws of the two end pieces. If you look at a breakaway pic of an alternator, it may become clearer. The claws at one end of the shaft are magnetized north, and the other group of claws are south. (edit: posted before I saw the the video. They look like the stock stator claws, but they are a custom build with some similarities)

images


At otherpower.com, there are many links and pics about modifying a car/truck alternator to make it a Permanent Magnet (PM) alternator. Mostly for a small DIY wind-generator or a small back-up generator (by hacking the voltage regulator, they can put out 12V up to 120V).

There are so many similarities between PM alternators and PM motors, they are not difficult to modify. Everything from a small geo Metro alternator up to the 160A Leece-Neville truck alternator. http://www.fieldlines.com/board/index.php?topic=143086.0;wap2

They can be brushed or brushless (by adding magnets), lots of options if you can't find an off-the-shelf motor in the size you want. Not sure about efficiency because they were never meant to be a motor.
 
Dee Jay said:
[youtube]_QYVjZZI79k[/youtube]
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This guy basically shows you how to make it suck as much as possible.

The triangle skew is to minimize torque ripple at the cost of efficiency and performance, and make it able to be assembled by just wrapping around a pre-wound coil. If you do a permanent magnet conversion, you go straight magnets with the straight slots, and performance and efficiency go up quite a bit.

Then when you wind... the whole big gain you can make is to have less end-turn copper, this guy ended up with MORE, defeating the whole point (but getting him higher voltage that I assume he was looking for).
 
liveforphysics said:
This guy basically shows you how to make it suck as much as possible.
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:lol:
Miles said:
See the mega-thread, here: http://www.rcgroups.com/forums/showthread.php?t=905411
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Miles, I remember that rcgroups thread, and yes it has grown mega. A lot of haters hounding Randy in that RC forum. Must be PM envy :lol:

BobDiode has an account on here and was hanging out for while. I wanted to ask him how a perpetual noob like me would go about building my own AlterMotor but I was starting to get busy with other thing sat the time. And fabbing my own PM rotor was beyond my means. But now that alternators are sold with PM 's installed and I figured out an easy, affordable way to use a freewheel as a LHD, I'm fired-up about this altermotor project again! :twisted:

Thanks for tall the input guys!
 
dee jay! good to see that youre back around man! :mrgreen:

but i pondered the same idea that you have also and ive been wanting to do this for a while before i got an rc motor. only build that comes to mind when thats mentioned is enoobs inrunner build(wondering where he is now since there was no update on that). IIRC he used alternator parts to build an alternator-sized outrunner. time for me to go to a wrecking yard and pull an alternator off of an old car. :lol:
 
Widodo did a good job with that thread. Controlling the voltage to the unmodified rotor gave good control of low rpm torque and higher rpm.
 
Yes, agreed.

The electric buggy guy is doing it right. If you're going to do an alternator motor, don't bother worrying about that 12watts peak of power getting wasted to make the electric field, and your brushes ride slip-rings, so they are going to way outlast the bike.


Crank up the power to the rotor field, enjoy an easy to control (because of strong BEMF) low-speed easy on controller to make big torque motor. Then ramp down the rotor field as needed for flying along at high speed.
 
liveforphysics said:
Yes, agreed.

The electric buggy guy is doing it right. If you're going to do an alternator motor, don't bother worrying about that 12watts peak of power getting wasted to make the electric field, and your brushes ride slip-rings, so they are going to way outlast the bike.


Crank up the power to the rotor field, enjoy an easy to control (because of strong BEMF) low-speed easy on controller to make big torque motor. Then ramp down the rotor field as needed for flying along at high speed.
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:!:shit, you're right! i can be up and running without PM's…I can buy a Delco 10si now and upgrade with PM rotor later

For a low low price of $180 (18,000 yen) I can get this pimp ass chrome Delco (for lowriders). True chrome on my Giant Revive would look SICK!
alt.jpg

HEY how about this:

it wouldn't be too hard to build a switch to toggle between motor mode and regen/alternator mode. and using capacitors to capture regen in alternator mode (slowing down), then switch to motor mode to accelerate as the caps power up rotor for torque !

Do you think it's possible with regular caps?
 
def215 said:
dee jay! good to see that youre back around man! :mrgreen:

but i pondered the same idea that you have also and ive been wanting to do this for a while before i got an rc motor. only build that comes to mind when thats mentioned is enoobs inrunner build(wondering where he is now since there was no update on that). IIRC he used alternator parts to build an alternator-sized outrunner. time for me to go to a wrecking yard and pull an alternator off of an old car. :lol:
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Hi def215!

I don't remember ever chatting with you before to be honest.. You joined in late 2009, probably around the time I was slowly dropping out of ES. I really like your projects and DIY gumption!

If you're into electronic music, I have an abandoned podcast in General Discussion and I'm getting ready to rock another DJ mix soon. :mrgreen:
 
Would this be big enough to power the rotor long enough during take off?

ONLY $26

[youtube]bY7LLX2goOQ[/youtube]
 
Dee Jay said:
def215 said:
dee jay! good to see that youre back around man! :mrgreen:

but i pondered the same idea that you have also and ive been wanting to do this for a while before i got an rc motor. only build that comes to mind when thats mentioned is enoobs inrunner build(wondering where he is now since there was no update on that). IIRC he used alternator parts to build an alternator-sized outrunner. time for me to go to a wrecking yard and pull an alternator off of an old car. :lol:
Click to expand...
Hi def215!

I don't remember ever chatting with you before to be honest.. You joined in late 2009, probably around the time I was slowly dropping out of ES. I really like your projects and DIY gumption!

If you're into electronic music, I have an abandoned podcast in General Discussion and I'm getting ready to rock another DJ mix soon. :mrgreen:
Click to expand...

its all good. i just really remember your soundsystem build in the general discussion and i followed that for quite a while because it was pretty cool. thats why i remembered your username. :D but i cant wait to see an alternator motor though. :mrgreen:
 
Ah yeah, the Boombox project… I'm very proud of that one. It hasn't changed much and there's still a lot work to be done on it but I'm really enjoying it.

The AlterMotor is very doable because most of the parts I need can be had locally, plus my revive already has battery packs and Crystalyte BLDC controller and throttle hooked up.

But I may work on motorizing my Precious Cargo Bike first because my kids had gained weight and the heat wave is coming so I gotta get crackin.
 
Dee Jay said:
Miles wrote:See the mega-thread, here: http://www.rcgroups.com/forums/showthread.php?t=905411
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Hey Miles, I got the chance to read some of Randy's posts at the RCgroups and man there are some epic keyboard battles on there, ha ha! Randy really rattled some cages. Funny thing is, so many critics hounding him but they're not willing to build an altermotor to see the results for themselves.. :lol:
 
pengyou said:
hehehehe better make it a motor for a trike :)
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Dude there are so many different size alternators. You can get a small one from a very small car. Or you an even smaller one from a motorcycle.

If you're not one of Randy's detractors from rcgroups then you would just go ahead and make an altermotor.

8) I will, for sure.
 
Dee Jay said:
pengyou said:
hehehehe better make it a motor for a trike :)
Click to expand...
Dude there are so many different size alternators. You can get a small one from a very small car. Or you an even smaller one from a motorcycle.
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FOCK! :shock:

A Japanese/Brazillian grand-dad beat me to the first Altermotor Ebike in Japan! Complete with a car "buzina" (horn) and a TAY-OH-DA steering wheel..

meh, being first is overrated… :(

Strictly assist though cos he's using one motorcycle SLA for everything

Viva la Alternadore! :D

[youtube]K92WllxeFTE[/youtube]
 
I don't think the dude was using it as a motor but as an alternator to charge his battery. With all the lights, bells and whistles he had on the bike he would need it.
 
salty9 said:
I don't think the dude was using it as a motor but as an alternator to charge his battery. With all the lights, bells and whistles he had on the bike he would need it.
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damn.. GOOD POINT!

BUT

The video title is

Bicicleta (Bicycle) de (by?) Volante (driven?) com (with) Alternador (Alternator)

If my Japanese Portuguese is correct..
 
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