@@nicod974 Tronic picks Ortega by default. Any VESC developer can pick their favorite observer and other default values. They like Ortega for whatever reason. Anyway, the default picked by Benjamin Vedder in the MXLEMMING observer. It didn't even occur to me to check this was different from Vedder defaults. When I selected the MXLEMMING observer I got immediate proper motor operation.
Tuning is different with stock rotor inertia than with added load and inertia? Did you tried adding mass to the rotor shaft and see if it change? My 75-7R motor on my drag racing Zero react similar when runnimg no load and with only stock inertia... but when connected to the wheel it spin smoothly. I know tuning matter. Are you sure it is just created by the motor and bot both motor and controller not perfectly tuned together?
I used the motor wizard to set up the motor, but have done no tuning. I had no idea what might cause this so I am hoping that someone with VESC experience would have seen this before and could tell me what settings to tweak. This motor ran perfectly on a Flipsky 75200 just last week.
Hay unrelated to this video but figured I would ask here being the most recent. I have a ND96530 that needs 5 mosfets replaced. It’s already torn down so I’m just asking if you can direct me to anyone who could replace them for me. I don’t have the equipment to replace this type of mosfet. Or maybe you think it’s unreasonable to replace and just buy another? Just wondering what you suggest. I think I have watched every video of yours and I’m always impressed with your knowledge. Much respect. Kevin from Arizona
PM me on facebook. I can do this work. There is a pretty good chance this isn't the only problem. Sometimes it is, but killing gate drivers is common too.
Try turning sensorless erpm wayy up (like 20k) and raise hall extra samples to 4 or so. Also try full sensorless and see if either one resolves it. Ive had vescs inexplicably do weird shit free spinning motors that does not happen when under load. What do your graphs look like? Bemf and "Foc" Q and D axis current/voltage?
Turning sensorless eRPM to 20,000 did stop the pulsing or stuttering, but now the motor is sort of "growling" at all RPMs. Extra samples didn't seem to effect anything.
@de-bodgery yea that sounds like typical hall sensor noise, pretty common, hence the reason a lot of vesc developers are pushing for full sensorless so hard, extra samples tend to be a hit or miss in my experience. any luck with full sensorless? the initial startup might be a tad jerky but it should get smooth real quick. One other thing the remember, is that vesc foc mode relies HEAVILY on proper R and L measurements, you could try measuring resistance manually and comparing to the vesc's measurement taken during detection and adjusting accordingly. And IPM motors inductance is constantly changing, which is why mpta mode was created. I could be wrong, but im pretty sure MPTA on these is still kind of in the baby stage and could use some work, but that shit is wayyyy above my head so im not quick to criticize it. oh and double check your flux linkage is accurate as well, it can be calculated from a graph of BEMF i love vesc, but i would be lying if i said they havent kicked my ass a time or 2 with the vast amount of control they give you .
@@ganzeytyler I unplug the hall cable, set the controller to sensorless and it never finishes detection. No idea if it would run any better sensorless or not. I have messed with sensorless eRPM and I can get rid of the that stuttering, but I jsut replace it with a growling sound and the motor runs really rough.
@@ganzeytyler These were all good ideas and I tried them, but none of it was what solved this. IT was the observer type in FOC in the Advanced tab. I changed that to MXLEMMING and i got immediate results! Funny thing is, I know the guy (MXLEMMING) that developed this observer. He and I were talking about it probably 4 or 5 months ago.
@@de-bodgerythat is AFAIK a very great observer for higher (e)rpm motors but i haven't tested it yet, what i do know is that it doesn't need the observer gain tuned, so perhaps there was one of the issues however i would like to know how it reacts on things like e-scooter hub motors (generally low kV and pole pairs)
It's probably happening when the motor switches from hall sensors to sensorless. I have the same issue with my bbshd and vesc. Making the switchover rpm higher helps a bit but doesn't eliminate the problem
That doesn't explain why it works smoothly at low RPMs and then stutters for an RPM range and then smooths out again. If I set FW, I can go lots higher RPM and still not stutter.
Tuning is different with stock rotor inertia than with added load and inertia? Did you tried adding mass to the rotor shaft and see if it change? My 75-7R motor on my drag racing Zero react similar when runnimg no load and with only stock inertia... but when connected to the wheel it spin smoothly. I know tuning matter. Are you sure it is just created by the motor and bot both motor and controller not perfectly tuned together?
@@de-bodgeryyea thats what the transition stuttering looks like, smooth while using halls and low speed, stutter stutter stutter, smooths out once the observer can track it sensorless.
@@Doctorbasss I ran this motor on a Flipsky 75100 jsut last week and it ran perfectly. Now I've finished repairing this Tronic 750 and testing the controller with the same motor and seeing this behavior. I don't get it.
