is there a way to "prime" the rotor flux before launch? maybe try a brake torque launch?
I suppose I could. I understand the reason for a lack of torque from a dead stop. The weird part is that it doesn't have the same current at equivalent speeds higher up.is there a way to "prime" the rotor flux before launch?
can you clarify if you mean battery amps or motor amps? battery amps is always going to be lower at the start.
It is possible, even likely, the controller is waiting for a "good" speed signal before dumping lots of amps too, or other slew variable.
but doing a brake torque launch might prove informative (w/out wheels spinning, just loading the motor at 0 rpm).
I don't know how you tweak these controllers, but I would have a look at the parameters on the top of page 31 here (i.e. full Accel Rate LS), and make sure you consistently apply the throttle during testing (and note the values, as well as the rotor time constant).
http://www.thunderstruck-ev.com/Manuals/1234_36_38 Manual Rev Feb 09.pdf
Actually use the accel rate setting as seen at top of page 35 when in torque control. There's no LS or HS with that one.I don't know how you tweak these controllers, but I would have a look at the parameters on the top of page 31 here (i.e. full Accel Rate LS), and make sure you consistently apply the throttle during testing (and note the values, as well as the rotor time constant).
http://www.thunderstruck-ev.com/Manuals/1234_36_38 Manual Rev Feb 09.pdf
I thought about that. Not sure it'd help with harder launch. I have creep in my factory EV (Think City). I really like driving with it. After years in conversions and racers without creep I was unsure about the feature when I got the Think 6 years ago. But quickly grew to like the feature. Really nice for parking and inching forwards, or backwards.I see the distinction now, thanks!.
A bit of creep torque might help too, but could be problematic.
Yeah, my Accel Rate is definitely already set at 0.1 seconds, it's at max current, and 8000 rpm limit. I'm not sure what else I can play with at this point. I have a hacked programmer, so I could mess around with other settings if people have ideas.Actually use the accel rate setting as seen at top of page 35 when in torque control. There's no LS or HS with that one.
major