Hoping to find some direction for solving my issue. I am using a 24V ODrive with the D5065 270KV along with the included 50W brake resistor (0.5 ohms) and a 24V 450W power supply. The motor provides a constant load in current control mode and during use is backdriven against that load at a variable rate. At very low currents (3-5A) I was constantly tripping the vbus voltage limit.
I reduced the power supply to output only ~20V and bumped up the brake resistor value in the software to 0.7 ohms. That helped a bit, but now I’m having the same issue at a currents of >=12A.
I also noticed that if the motor is backdriven very slowly, or very quickly, the resistor seems work properly. At certain backdriven RPMs (~800-1000) the voltage spikes heavily and trips the overvoltage error.
Any insight into what I’m seeing? Is a fix as simple as using a larger power resistor? I’m not sure how to solve this, or if this application just isn’t a good one for the hardware.
A side question (I’m sure it’s related), but during the backdriving of the motor, the power supply tends to click and I think the fan turns off momentarily - is this damaging the power supply?
Thanks for any assistance!