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  #1  
Old 05-05-2008, 07:39 AM
emoto emoto is offline
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Default My Electric Motorcycle

Here she is:

www.electricmotion.org

Best,

Lennon
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Old 05-05-2008, 11:34 PM
ngrimm ngrimm is offline
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Default Re: My Electric Motorcycle

Seems like a very nicely done conversion. The watt/hour per mile are really down there at 75. How has the Kelly controller been working for you? Norm
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Old 05-05-2008, 11:49 PM
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mattW mattW is offline
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Default Re: My Electric Motorcycle

Wow that's almost exactly the same as the bike I'm planning- same motor, same controller the only difference is I'm planning on using LiFePO4 instead of Lead Acid... Whats the performance like with 300A and how does the motor's brushes stand up during regen?
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Old 05-06-2008, 12:43 AM
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Default Re: My Electric Motorcycle

also note, that he bought the bike brand new from the dealer without engine

great conversion, well executed. Let us know about the regen. Kelly is still fairly new, and we're eager to hear about it,
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Old 05-06-2008, 04:18 AM
emoto emoto is offline
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Default Re: My Electric Motorcycle

Thanks! The odometer is at 400 miles (starting at zero), and everything seems solid. The Kelly controller, Mars motor, etc. all seem to be working very well. Here's a video of the bike in action:
http://youtube.com/watch?v=HWyumTVAQBY

No complaints. I only put things together once, and they've all worked from the beginning.

-Lennon
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Old 05-06-2008, 05:47 AM
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Default Re: My Electric Motorcycle

What is the reason for the 45mph top speed? is it the rpm limit of the motor at that gear ratio or not enough power or what?
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Old 05-06-2008, 06:35 AM
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Default Re: My Electric Motorcycle

Nicely Done

Good Job
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Old 05-06-2008, 08:48 AM
emoto emoto is offline
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Default Re: My Electric Motorcycle

There were two reasons for the max speed of 45 MPH:

1) Aerodynamic losses are too high above 45 MPH, so I didn't want to temp myself to waste all my battery juice.

2) I wanted the torque. Since I didn't want a transmission, this required me to have a decent gear ratio. I chose a ratio of 72/12 = 6. The gear ratio essentially determines the top speed (for a given motor, wheel size, etc.)

For both of these issues, check out my Excel spreadsheet calculations:
http://lennonrodgers.googlepages.com...lculations.xls

According to these calcs, the motor has plenty of room to have a faster top-end speed.

-Lennon
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Old 05-06-2008, 09:14 AM
emoto emoto is offline
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Default Re: My Electric Motorcycle

p.s. I posted my motor performance plots here:
http://lennonrodgers.googlepages.com...erformance.jpg
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Old 05-06-2008, 04:11 PM
emoto emoto is offline
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Default Re: My Electric Motorcycle

Someone on another list asked about a conversion kit. Here's some info:

The bulk of the work was in cutting and re-welding the frame (the
actual welding was done on a weekend). The other parts were quite
easy. And the bulk of the cutting/welding time was spent on a stool
staring at the bike - trying to figure out how things would fit
nicely. The second most difficult part was welding/fabricating the
custom brackets to pinch the batteries - they took an entire weekend
to design and fabricate.

Besides that, this bike is very straight forward for converting
(everything fit like a glove). Note on my website that I give all the
steps to repeat what I did. For example, I only needed 1/4'' steel
spacers for the motor mount, and was able to use the existing engine
mounts. I was amazed to see the chain align properly - after inserting
the spacers. This simplified the motor mounting greatly.

All the instructions are here: www.electricmotion.org

Someone out there could crank these things out in lots - I estimate it
would take about 20 hours of labor each if they were made 5 at a time
(100 hours total). It took me 120 hours of labor for just one - but
that included my calculations, and a lot of thinking time.

The bike cost just under $3,000 to build - all new parts - so there IS
a little room for profit (I'd like to see these things at an
affordable purchase price; ~$4,500 out the door brand new. This way
people would actually start buying them). Note that I found an
operating cost of about 1.5 cents/mile if the cost of the batteries is
ignored, and ~7 cents/mile if the cost of replacing the batteries is
included. This ends up being the same as a very efficient gas
motorcycle. However, the battery cost is included in the initial
purchase (and will likely last 10K miles). Many motorcycles never see
a day past 10K miles (though I find that hard to relate to). My
operating cost estimates can be found here:
http://lennonrodgers.googlepages.com...lculations.xls

Best,

-Lennon
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