Max power I can get from it is 1300W, this is when I hold the board in the water, no movement.
Why is that? I would expect the max power to be at least twice higher. Are my settings wrong? Does a no-name motor deliver less power than a brand one? Do I need a bigger prop?
When the throttle goes over ~80%, the motor cuts off. This happens only when flying, so its not the over current/heat. When in PPM mode, this does not happen. Any thoughts how to fix this?
Hello Victor, Your motor current is set way too low. Your 60A peak from the data sheet refers to air.
In the VESC Tool, you can set 150A, as the VESC generates three-phase alternating current on the motor side and the winding is water-cooled.
A quick calculation
44V battery x 60A max motor /(phase shift root 3) P max 1500W
With the new settings, this is approx. 3800W, which should be more than enough power.
So set Motor Current Max to 140A
Absolute Maximum Current to 190A
and Slow ABS Limit to True, then it should work.
Of course, this assumes that you have replaced the thin 16AWG cables with at least 12AWG, better 10 AWG, and that your battery can really deliver 100A/4500W.
Regarding your second point, you have set the Absolute Current too low.
It has switched off at the peaks, and the measurement from this model is not particularly accurate, so there are occasional outliers.
Important to understand: the VESC converts DC voltage on the battery side to AC voltage on the motor side and also transforms the voltage according to what you specify with the remote control.
If it is the new model with the two small switches on top, it already has a phase filter. The older model does not have one, so it must be turned off. This is the default setting if the firmware has not been modified. If there are problems with the motor running, there is better firmware from Jaykup in the esk8 forum that is adapted to the VESC.
I hope this helps
In addition, the VX3 also has three different speed modes.
I was estimating the power as: 44V battery x 60A max motor, without dividing by square root of 3. I’ll increase the max current settings as suggested.
Unfortunately, I have not replaced the motor wires. I thought about it, but for some reason did not do it. I can’t do it now, since the motor is waterproofed with epoxy. Could this be the main reason for less power? Would shortening the thin wires help?
I am planning to try the board with the new current settings, if that doesn’t help, I’ll shorten the thin motor wires. In case shortening helps, I’ll switch to another, new motor with the thin wires replaced.
I have a Foil Drive High Power motor and the thin wires aren’t your problem, it is a setting in the ESC.
My setting was 80 amp max motor, and 160 absolute max.
I set up my ESC using ChatGpt, you can also use it to diagnose problems. Version 5 has been difficult to use for me, but eventually after numerous refreshing it works.
I ran your setup file through ChatGpt and it wasn’t very happy with many things, some are relevant, some things aren’t, with recommendations the same.
Let it know your setup with the components and battery configuration, and ask for analysis of the configuration file that you upload.
Unfortunately version 5 will time out quickly, so don’t upload any images or ask too many questions, try to be specific.