Hi -
I have an electric motorcycle I built. The base system is as follows:
48vdc
Altrax AXE 4844 controller
Etek permanent magnet brush motor
I have burned up three controllers now. All have lasted a number of
miles before failing. The first lasted about 2000 miles. The second
about 600 miles and the last one about 2,400 miles.
The vehicle's wiring was questionable on the first two failures. I was
using one of the four batteries for my 12 vdc lighting requirements and
had a common ground to the frame of the bike. The motor casing was
grounded to the frame as well.
Also, I went through a set of brushes on the Etek after about 2000
miles. I attributed that to the fact that the AXE 4844 is a 400 amp
controller. So when I installed the second replacement I cranked it
down to 220 amps which seems to work fine in my application until it
burned up in about 600 miles.
When I got the third replacement Altrax I decided that perhaps some
sort of anomalous ground-loop was occurring in my system which was
causing the controllers to fail. So I made some wiring changes before
hooking up the third controller.
Altrax happen, at the same time, to post some suggested wiring
schematics to their website which I followed prior to installing the
third unit. I used the schematic titled: "AXE to Permanent Magnet Wire
Diagram" <http://tinyurl.com/2w4u49>. I added a contactor, a pre-charge
resistor, a diode across the contactor's coil, and a 48vdc to 12vdc
converter. I also eliminated all grounds to the chassis, including
lighting grounds. I triple checked diode polarity and all other wiring
prior to heating up the new controller.
Well, that one lasted about 2,400 miles before it burned up. I had it
set to default settings except it was turned down to 220 amps.
Any ideas about what may be happening? Could there be some timing issue
with the motor?
For more details about my bike check here:
http://www.austinev.org/evalbum/971
Thanks!
Be well,
Bob
____________________________________________________________________________________
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I have an electric motorcycle I built. The base system is as follows:
48vdc
Altrax AXE 4844 controller
Etek permanent magnet brush motor
I have burned up three controllers now. All have lasted a number of
miles before failing. The first lasted about 2000 miles. The second
about 600 miles and the last one about 2,400 miles.
The vehicle's wiring was questionable on the first two failures. I was
using one of the four batteries for my 12 vdc lighting requirements and
had a common ground to the frame of the bike. The motor casing was
grounded to the frame as well.
Also, I went through a set of brushes on the Etek after about 2000
miles. I attributed that to the fact that the AXE 4844 is a 400 amp
controller. So when I installed the second replacement I cranked it
down to 220 amps which seems to work fine in my application until it
burned up in about 600 miles.
When I got the third replacement Altrax I decided that perhaps some
sort of anomalous ground-loop was occurring in my system which was
causing the controllers to fail. So I made some wiring changes before
hooking up the third controller.
Altrax happen, at the same time, to post some suggested wiring
schematics to their website which I followed prior to installing the
third unit. I used the schematic titled: "AXE to Permanent Magnet Wire
Diagram" <http://tinyurl.com/2w4u49>. I added a contactor, a pre-charge
resistor, a diode across the contactor's coil, and a 48vdc to 12vdc
converter. I also eliminated all grounds to the chassis, including
lighting grounds. I triple checked diode polarity and all other wiring
prior to heating up the new controller.
Well, that one lasted about 2,400 miles before it burned up. I had it
set to default settings except it was turned down to 220 amps.
Any ideas about what may be happening? Could there be some timing issue
with the motor?
For more details about my bike check here:
http://www.austinev.org/evalbum/971
Thanks!
Be well,
Bob
____________________________________________________________________________________
Yahoo! oneSearch: Finally, mobile search
that gives answers, not web links.
http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev