Recent content by Thecoco974

Hi everyone, just passing by to do a little report on the MP2 I build and adding to the recent discussion on bus bar issue. I just did a weekend of race with it : 5H endurance race and 3 x 20min speed race. In total something like 250km of hard riding. The motor was my weak link and could not...

The first reason I had to bolt through was that I haven't put screws on before soldering all fets and didn't want to fatigue the legs nor strip pads from the PCB by bending them :p. I think heatshring passing 1mm the tab musshrom on the first thread and might hold isolation (time will tell). I...

I did use my MP2 with VESC. I haven't had time to report everything here, sorry about that ... I had to switch back from mesc to vesc because I needed datalogging before road testing and since I had already a serial to bluetooth adapter it was the easy route. Not sure my header file could help...

I've set up ABS_MAX_PHASE_CURRENT to 150 and MAX_IQ_REQUEST to 100, that's a lot better :lol: However I trigger the max current error state accelerating at now load sometimes, I think the switching frequency might be a bit low for the low inductance my motor have. Probing the phase current...

Thank you mxlemming, just made it work by putting the MESC init after the motor init as you said ! Also have the live expressions now (I was as you also said using the wrong expressions, motor1 was needed instead of foc_vars). I had a few trouble playing with it (burned the blue pill regulator...

I've been reading advancement on this DIY ESC quite often because I was looking for something capable of some good power. So first of all, thank you for sharing this badginer and thanks to all the people contributing to this ! I've recently ordered some boards ( V0.2 at the time) and assembled...

Here is a video showing the VESC configuration and issue with sensorless : https://youtu.be/IblrYzZZGLE

Reviving this old thread, hard to realise more than a year as passed since my last post ... Sorry for not a answerring to all of your great suggestions back then, I had been caugth in my professional work without motivation left for this diy motor adventure. To respond to stan, It is a 750W...

About copper section, another important thing to take into consideration for correless stators is Eddy losses. A simple formula to estimate the losses per unit of mass : Applied to our case : (3.14/6)*(0.0002m^2*0.7T^2*2000hz^2)/(2*17E-9ohm.m*8960kg/m3) = 423.33W/kg So if you have 1kg of...

My high temp epoxy needed 10 days for full hardness at ambiant temp and would only had a 50°c glass transition temp then. With 16 hours at ambiant and 16h at 60°c it is full hardness and 115°C TG. Maybe yours as something like this specified ! I've found copper to add good stifness to it also...

Good work on the carrierless stator ! It's probably the best way to get good copper density with proper compression tooling and vacuum infusion of high temp epoxy :) APL it's funny you mentionned the symetrical coreless outrunner friction drive since it was my first design who was'nt build last...

I actually did use your advise to true up the seconde face of one rotor, mandrel is the way to go for this :thumb: Actually the lathe even if it's kind of cheap for this kind of tool was a lot of money to spend on a hobby like this for me, it might be a while before I pull the trigger on big...

Not sure field weakening would be of any help if the base speed of the motor isn't reach without it. Have you checked the RPM at no load ? If you are not hiting the speed you should regarding KV and battery voltage it may also be a erpm limit or any kind of software limit actually. What motor...

Actually haven't tough about that at all :shock: ! Maybe reducing the lip heigth to half the magnet thickness will be sufficient for keeping the magnet from flying and cut the bridge ? I don't think i'm going to cut on balancing for sure, static first and dynamic if needed (but for that i'll...

Unfotunatly vesc are quite expensive and I know they are good at self destructing. That's why I hope to find a diy controler with separated and cheap to fix powerstage that is capable of 60+khz. I can not afford to burn one of those 75/300 for sure at 450€ a piece :? Firstly thanks for your...