cardinal43
Member
http://www.youtube.com/watch?v=WKAMus3oSdw
I found this online, below are some comments from the creator. I have no idea what most of this means, but where can I buy one of these?!?!
Actually, the rear tire acts as sort of a clutch to blow off excess power. This thing really has WAY too much power. I may even reterminate the motors to wye rather than the current delta configuration to ease the load (inductance) on the ESCs and reduce the power somewhat. But, I have not decided on that just yet. This thing is 28hp but, are you ready for this, 133ft pounds of torque at the rear wheel! I have been sneaking up on the "Perfect" setup and this comes really close. It accellerates like a freakin banshee, yet is still controllable. Everyone who rides it comes back yelling "This thing is AWESOME!" It is not peaky or difficult to drive untill you really get on it. Then it is a blown big-block. The only thing I have had consistant problems with is blowing controllers upon innitial arming. The problem appears to be the fact that I have quadrupled the input capacitance on the ESCs and I arm them individually. So, when one is armed, then the second ESC is plugged in, the huge caps discharge into the second controller and blow the 5v regulator on the brain board. So, I am installing a precharge resistor to, hopefully, eliminate that power inrush problem. Also, I need to change the PWM to 24khz rather than the 8khz the HV160s are currently set at. I had no idea about that setting. Apparently these inrunners require high PWM to reduce the huge ripple spikes I am getting. If that does not drop the ripple, I will go to wye. But, theoretically, going from 8khz to 24 khz should drop my max ripple from 10volts down to 3 volts or so which is a safe range for these ESCs.
I found this online, below are some comments from the creator. I have no idea what most of this means, but where can I buy one of these?!?!
Actually, the rear tire acts as sort of a clutch to blow off excess power. This thing really has WAY too much power. I may even reterminate the motors to wye rather than the current delta configuration to ease the load (inductance) on the ESCs and reduce the power somewhat. But, I have not decided on that just yet. This thing is 28hp but, are you ready for this, 133ft pounds of torque at the rear wheel! I have been sneaking up on the "Perfect" setup and this comes really close. It accellerates like a freakin banshee, yet is still controllable. Everyone who rides it comes back yelling "This thing is AWESOME!" It is not peaky or difficult to drive untill you really get on it. Then it is a blown big-block. The only thing I have had consistant problems with is blowing controllers upon innitial arming. The problem appears to be the fact that I have quadrupled the input capacitance on the ESCs and I arm them individually. So, when one is armed, then the second ESC is plugged in, the huge caps discharge into the second controller and blow the 5v regulator on the brain board. So, I am installing a precharge resistor to, hopefully, eliminate that power inrush problem. Also, I need to change the PWM to 24khz rather than the 8khz the HV160s are currently set at. I had no idea about that setting. Apparently these inrunners require high PWM to reduce the huge ripple spikes I am getting. If that does not drop the ripple, I will go to wye. But, theoretically, going from 8khz to 24 khz should drop my max ripple from 10volts down to 3 volts or so which is a safe range for these ESCs.