Endless Sphere

Can you show exactly how you're taking these measurements? Switch node looks pretty good for 850A, there's some ringing but it's all over within a short time. The gates... It's really strange that there's more ringing on the gates than the switch node. Is it perhaps possible that this is being cause...

what is the HFI performance (I mean on your F303), I asked the same question to stancecoke before... can it work as good as hall sensor under load? any harsh noise for heavy load starting? what is your feeling for Lishui sensorless performance The sensorless branch works for an EBike with a geared ...

https://www.youtube.com/watch?v=qFH7duzY3uM qFH7duzY3uM Just ported MESC to F401CC. Been running in the Easy DIY ESC from Badgineer, Casainho, Andre. Nice piece of kit. Cute size, better ADC readings than the MESC board, but significantly down on power. This is interesting, because 1) it can now be ...

Built, running MESC FOC firmware on F401CC black pill board. qFH7duzY3uM https://youtu.be/qFH7duzY3uM The current sense waveforms are really nice TBH, very clean for a low side shunt. Nicer than my MESC board for sure. Current trace with low inductance (5uH) motor EasyDIY ESC.png The switching in th...

Just built one of these (casainho sent me r1 board) Seems to switch nicely at very preliminary glance and is pretty small. Fsesc75100 for scale. the board looks really nice and neat! maybe you can try my comparison and verify the current consumption @ same rpm. Thanks. I was pretty pleased with how...

Just built one of these (casainho sent me r1 board)

Seems to switch nicely at very preliminary glance and is pretty small. Fsesc75100 for scale.
I need to go to sleep so hopefully tomorrow we get some spinny spinny.

@mxlemming, can STM32f302CB do the same thing? happened to have two 302 chips on hand. It could but it would take porting and setup. Also you'd need external op amps or current sensors since f302 i recall only has 2 and I'm not going to deal with that nonsense. Just built up the easy DIY ESC from b...

I'm not good at coding/reading the codes, just checked again, yes stancecoke's routine counts the first hall status changing position (entering the hall sensor) and ignore all the next until the status change again (leaving), which is not accurate. the accurate position shall be the center of betwe...

Stator resistance and inductance should be used to tune the PI loop for the current controller I always tune the PI parameters by trial and error, not by the mathematical/physical theory :D it will be much less accurate since it relies on single point detection Yes that's right, the autodetct routi...

The best way i found to do this is to run it very slowly in open loop with a high d axis current, integrate the angle and count the number of steps per every hall state. Then after a full revolution divide the integral by the count for each hall state. That gives you the centre angle of each hall s...

when shifting the rotor electrical angle Thank you for the feedback, but I can't follow your experiments :confused: The rotor angle is detected by the autodetect routine in v3. You have to run it once, otherwise the controller won't know the correct positions of the hall sensors. I don't know, how ...

It's so beautiful. Hoping it works!

1kW sounds very low for that setup. And that battery looks quite large. I don't know much about batteries but surely it can do more than that? That controller also looks very large for not so much power. 18 MOSFETs to push 1kW? Erm... You can do that with a controller 5x6cm. Might be an issue with j...

Updates. Implemented tracking and switchover between pwm and no pwm and Implemented a crude 180 degree HFI disambiguation. It's now completely silent at standstill, little hiss as hfi starts and then smooth torque. Implemented max power limiter so I can set the max battery draw. It gets easier and f...

IMG_20220501_202033814.jpg Nice new printed wheel that should bea lot stronger. Better filament, extra wall layer and the cutouts force it to have lots of thick radial lines. Survived the first ride out at least. FLIR_20220501_080939.jpg Here's the motor and bike 5 mins after the ride. Had a bit of...

IMG_20220428_201050160.jpg This new motor is presenting all sorts of problems the previous one didn't, like I can run enough braking force to skid if I lean forwards a bit. And a few goes later it rewards me with a 20km pedal back home through the fields, reminding me that it is in fact very much s...

Of course you've considered the possible failure modes. Aluminum weldments can be susceptible to fine stress fractures that are not obvious, and those stay tubes are also usually pretty thin wall, so I'd be more comfortable bolting the drive to steel. It may just keep working fine indefinitely... T...

Hey mx- novel drivetrain you built yourself there. Seems like a big ask for the dropout and brake bosses, but since it's based off the axle it's workable. I'd keep an eye on the frame attachments. And congrats on the success with your own controller. An impressive feat... small club of guys capable...

So with summer on the doorstep I've actually been using this motor in anger. It's better than I'd expected from initial testing. 1) under load it actually seems to generate less heat than on the bench which is weird. Even running 100A and going WOT up a hill it barely gets warm. 2) the noise is the ...

Reprinted the pulley. Added reinforcement holes, double checked the infill on the slicer, modified the tooth profile to better suit the newer parabolic belt teeth and increased the tooth count from 148 to 151. A minor change in ratio but brings the motor a cm lower which is more aesthetically pleasi...

I've also been playing with silent HFI for sensorless tracking at low/zero speed this week as this has recently been added to the vesc firmware. I have it configured to inject in d-axis at half the switching frequency so it isn't totally silent at 15kHz but not an issue on the road. It works really...

The ratings in table 48 are fairly close to the level I'm driving my current ebike at, and the belts seem fine (5mhp optibelt and contitech htd5m. I think they're ratings for a long life expectancy (50k hours from memory is usual for belt ratings), if your willing to accept while service life level...

The ratings in table 48 are fairly close to the level I'm driving my current ebike at, and the belts seem fine (5mhp optibelt and contitech htd5m. I think they're ratings for a long life expectancy (50k hours from memory is usual for belt ratings), if your willing to accept ebike service life levels...

If this works well perhaps you can upgrade your name to goodgineer. Really excited about this. As badgineer notes, I've been helping a bit with his questions on telegram but it's 99% his. I've had just enough involvement that I really want to get one to try. The name of the project is a clear state...

Short answer... Use SI units kV to rads-¹/V Invert it That's your Nm/A Multiply by amps E.g. 55rpm/V is 55x2pi/60 is 5.76rads-¹/V kT is 1/5.76 is 0.174Nm/A x140A is 24Nm That's it. If your motor saturates, the torque will be lower. Note... rads-¹/V = radians/(Vs) it just strangely feels more natural...