Went out for some morning testing today.
Started with:
Front: 40 phase / 15 battery amps
Rear: 100 phase / 25 battery amps
Did a few short pulls, felt good, so I cranked it up to:
Front: 80 phase / 25 battery amps
Rear: 200 phase / 55 battery amps
A couple more hard pulls down the street… then boom — ABS overcurrent fault pops up.
Didn’t have more time right then, so I went back out in the late afternoon.
Step 1: Rear down to 150 phase — nope, still faults.
Step 2: Front down to 50 phase — still nope.
At this point I had a brilliant idea: “Let’s just turn the front motor to zero amps and run only the rear.”
What could possibly go wrong, right?
Well… the instant I touched the throttle — spark noise, and the front controller just… left the chat.
So, I popped the lid open to inspect the damage… and wow.
Both controllers had capacitors with their negative legs blown clean off.
The rear controller still seems alive, but the front one? Nope, it’s not even turning on.
After a closer look, I spotted an “open-minded” IC on the DC-DC board. The PILL still works fine when powered from USB.
I put back the fixed controller, made some changes on cables and connectors, but it not able to measure the flux linkage with the 21s battery. If i use small 20v drill battery working without problem. Here is video whats happening flux linkage measure
I often had to restart the vesc tool before flux linkage was detected. You have to try it multiply times. I don’t know why it is not working all the time.
Yesterday i tested it with 180phase/50bat amps on the rear and 50phase/15bat amps on the front. I made ±9km with loots of short burst. Everything worked fine.
Now the adc inputs needs some love. I am thinking about to implement the MP2’s adc input circuit. It will be soldered on the top of the PIL
I run mine in a onewheel, it has almost 1000km now. Phase current is set to 165A, battery to 80A. Plus 45A Field weakening starting@60%. Works like a charm, never had an issue, no abs overcurrent, which is important on a onewheel, as a vesc failure is dangerous, you nose dive, when it suddenly stops.
Did you checked the parts after you uploaded the bom file to jlcpcb? Becouse a had to change the resistors for correct values.
Its not a nice board, but thanks.
Thx for the effort !
