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Home Brew / KR-E ...lectric
« on: December 19, 2010, 12:57:05 PM »
Have finally got my electric conversion of a KR-1 going, still some tweaking and testing required but happy with the progress. One design constraint I had was to make it look good, none of this square battery poking through frame/fairing BS, and I think I've achieved that 
The specs:
Motor ME0708 brushed permanent magnet, 4.8kw continuous or 15kw for 1 min max.
Batteries 3 38Ah 12V AGM SLA
Controller alltrax AXE4844
Currently it's set up for 200A max, which is about half what it could do with better batteries. The rev counter has been replaced with an ammeter, and there is also a digital display with energy used and voltage/temps etc. The main electronics are in the tank, which has the bottom cut out of it. With the DC converter under the rider seat, and the charger going under the pillion with a 3 pin plug. The motor is mounted directly to the swingarm to maintain constant chain tension, it drives the wheel through a 14/62 reduction, I machined the 62 tooth sprocket to around 20% of its original weight.
The max speed so far is just over 50kmhr, hoping to better that when I get the rolling friction down a bit. Range unknown for that reason. One thing you notice real quick is the lack of engine braking (didn't see enough benefit to pay an extra hundy bucks for a controller with regen), basically every corner feels like one you have clicked it down into neutral instead of first, which is impossible cos it's got no gears. Which is why it's got the big e-stop on the tank, if the controller fucks out, the most likely outcome is the bike takes off:shit: All in all it's pretty entertaining to ride though :yes:
yeh I have another thread on here for it somewhere, but the title is wrong on that one
The specs:
Motor ME0708 brushed permanent magnet, 4.8kw continuous or 15kw for 1 min max.
Batteries 3 38Ah 12V AGM SLA
Controller alltrax AXE4844
Currently it's set up for 200A max, which is about half what it could do with better batteries. The rev counter has been replaced with an ammeter, and there is also a digital display with energy used and voltage/temps etc. The main electronics are in the tank, which has the bottom cut out of it. With the DC converter under the rider seat, and the charger going under the pillion with a 3 pin plug. The motor is mounted directly to the swingarm to maintain constant chain tension, it drives the wheel through a 14/62 reduction, I machined the 62 tooth sprocket to around 20% of its original weight.
The max speed so far is just over 50kmhr, hoping to better that when I get the rolling friction down a bit. Range unknown for that reason. One thing you notice real quick is the lack of engine braking (didn't see enough benefit to pay an extra hundy bucks for a controller with regen), basically every corner feels like one you have clicked it down into neutral instead of first, which is impossible cos it's got no gears. Which is why it's got the big e-stop on the tank, if the controller fucks out, the most likely outcome is the bike takes off:shit: All in all it's pretty entertaining to ride though :yes:
yeh I have another thread on here for it somewhere, but the title is wrong on that one
, but ill post about it anyway, somebody else might know the link.