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Electric BMW R75/7
I've been kicking around the idea of building an electric motorcycle (EM) for several years. I got into Elec-Tracs to
get my feet wet on EVs. I hoped to build an EM based on a BMW and have been doing a low level search. I guess this is going
to be a low-tech blog.....
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| Donor Bike |
Jan 2008
A friend from the local BMW Vintage group came though with a great donor; A '77 R75/7 that he wanted the motor and transmission
out of. It's in real good shape mechanically so I won't have to mess with the chassis too much.
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| Chain reduction |
May 2009
I went through several iterations over the past year and here I am in spring 2009. I have a 7" HiTorque motor and added
a 2:1 chain drive reduction, as direct drive was just too geared too low (3.37:1 rear end). Controller is an Alltrax
4845. This setup works well; good pep running around the yard, using 3 Hawker SPS-60 SLA batteries. This shot shows the chain
drive reduction to the shaft (right side).
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| R47/7 EMW |
Aug 2009
My 14 Sky-Energy 100AH cells came in and I just got everything running in time for Power of DC 2009. I still need
to build the BMS and complete the 12V system.
In order to get data from my test setup I wrote code for my Palm PDA to display and log the data availble from the Alltrax.
AXE monitor software and manual
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| AXE monitor on Palm Vx |
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