Quote:
Originally Posted by DrKnow65
Congrats, you just made the "favorite sellers" list.
Back to topic, if this setup is requiring gear reduction, what KV motor would you have gone with instead? (interested for a someday revo, more interested in a tomarrow kind of direct drive hyper7) or would these be two entirly different KV needs???
|
Thank You!
I feel like I chose the best KV available that would fit the space/shaft size.
The lower the KV rating, the more torque they are supposed to have. This AXI 4130 is rated for up to 8 Series Lipo in an airplane. On a HV (8 series or more) setup with the 4.3:1 gear ratio diffs, I think this setup would absolutely scream. The plastic shafts would snap quickly, severe tire swelling, hard to control, good things like that. LOL
The problem with the higher gearing is, the ESC isn't reading the EMF feedback properly because there isn't enough feedback from the motor at low rpm's. I feel like this is the source of the cogging. I think Brian, (a very intelligent person) is right about this.
I wanted to try this with the stock diff gearing. I have at least learned something about the lower rpm threshold for EMF feedback and sensorless control.
On 6S2P A123, the motor, is on the lower end of it's recommended voltage range. Maybe 18 volts loaded. On 8 Series Lipo (around 30 volts loaded), it would be much stronger. But this exceeds the voltage limits of my Quark and I don't want to blow it.
It looks like this project is stalled waiting on the Hybrid diffs for now. But when I do get them, I will first try the 4130 again before switching to the higher kv 4120 motor. It should be interesting and hopefully show more about the behavior of these motors.