Endless Sphere

Uhm actually the measurement I got was all over the place but almost never that low. Amber DID NOT CALCULATE THE DEAD TIME CORRECTLY. This will cause miss readings in the resistance and all kinds of other problems. The dead time is determined by math based on all the worst case scenarios this is fo...

I think that there is something fundamentally wrong with your setup if you are getting 6.66 mOhms for motor resistance. The resistance posted by Arlo for the Gen1 motor is over 20mOhms which agrees with the figure I get for the gen2 motor. Also I think you are asking for trouble setting 500ns for d...

I would not put more then 10nf on the current signals it changes the timing. From signal to gnd Maybe scope the hall signals vs the phase signals. I dont mean to decouple current signals. They already have their caps. I am talking about hall sensors. They have 4K7 pullups, but i am wondering if it ...

I have tried to run the car again. We failed again!!! Motor runs in idle but stalls when loaded with car. First i set correct settings. I correctly installed 10nF caps to current sense lines. Then i calibrated FOC with 100A at 8Kerpm. 12Kerpm would overflow. I managed to took some video of signals o...

I think Bas mentioned earlier, that it is a safety mechanism at startup so we don't blow stuff up.. it's also if there is a short, not just if the motor is moving. Andy Hm... If it is not used as a feedback for FOC code then i think it is not needed. I use Fault, desat, OC and overtemp detection wh...

The voltage feedback signals do not need to correspond with the driver signals, they are only used at startup to see if the motor is running or there is a short somewhere in the power stage. You can make these signals digital, but remember that they have to be at 2.5V for motor standing still / no ...

Arlo1 wrote: ↑

Apr 14 2019 11:42am

Yeah sensorless start does not work with something big and heavy.

Arlo, why would you use backEMF signal if you have hall sensors available? Does it improve control anyhow?

tnx

Well it didnt worked out with dual/triple Lebowski PCB. There were some mistakes onboard and i couldnt repair them good enough to have reliable function out of the board. So i decided to start again small. I made a single board on basis of Volt inverter. It has basic Lebowski functions: - Sensorless...

The voltage feedback signals do not need to correspond with the driver signals, they are only used at startup to see if the motor is running or there is a short somewhere in the power stage. You can make these signals digital, but remember that they have to be at 2.5V for motor standing still / no ...

Ok i built my wiring for backEMF sensing. I see a snag though. Does backEMF signal has to be positioned in on the phases? I.E. Phase U signal from pin 5 corresponds to transistors actuated by pins 37 and 38? And V from pin 7 to pins 35 and 36? etc... Is that important? Screenshot 2019-04-15 07.25.32...

Hm... We failed miserably to drive with sensorless leaf motor iun a car :(. But that should be expected. I have the motor in my shop now and i am in the process of adding sensors the same as with my motor. While trying different settings i am learning and adding new stuff to my boards next revision....

Bas I think your answer to my mail about wiggle function will be of benefit to others. Sorry for my impatience with mail... What wiggle does is it wiggles the rotor back and forth a little bit, (once you give a bit of gas). This induced motion will make the sensorless catch on. It will wiggle back a...

Hi I managed to run a "black project" with Volt inverter and Lebowski brain. On 6Khz it was quite noisy, while noise subsided a lot on 12Khz. I even tried on 15kHz but it seemed motor bucked more there. I managed 4300rpm only with voltage and 5500rpm with 75A weakening. Because of 20 pole count cont...

I tried some more with Emrax and i am convinced that motor should be run at 12Khz or even 15Khz PWM. There is much less noise there. However 15Khz was somewhat more jumpy or so it seemed. Option n didnt change a lot. Higher PWM made it better. With 75a field weakening i arrived to 5500rpm! Bear in m...

You should fluctuations on the 12v line can carry into the 5v circuit[/color] Yes, i agree, 5V can be swamped in hash from 12V. However Volt inverter is quite good isolated and protected and with good decoupling... I am also surprised how good it runs without any brain isolation. Time will tell tho...

Good job, and it looks like you tracked the case elctrification down to a phase wire shorting to the case of the inverter. What PWM frequency and dead time are you running with the Volt inverter power stage? Freq and all parameters are the same as Arlo setup in his video. That is 6kHz. Well for dea...

NO F...N WAY!!!!! I just solved the problem that seemed unsurmountable... by a single 100nF cap placed from reset pin to GND Thanks Arlo i think i will invite you for a beer if i find myself in Vancouver. I was entertaining a thought of adding some 5V relays to test isolation when i decided to try t...

Gentlemen observe signal on motor case.... IMG_20190408_215755_1.jpg Now i measured and i get 207Vac! That is 0V DC! So i assume somewhere on the case there is a leak. But with ohm meter i measure in excess of 15Mohm from phase wires to motor case. How can i determine where to find the leak? Hm... c...

I checked the motor and phse to motor case was good. No pass through. Than i checked phase to inverter case. To my horror i saw one phase was passing through directly. Then i disconnected cables and measured again. I found out that one of the bolts was contacting the internal brace for current senso...

maybe the motor windings are somehow shorted to the case ? That it stays in drive_0 (with the voltage feedback) means the motor windings are not 'floating' but connected to gnd somehow (that or a FET is on). Another thing, when you did the throttle calibration for throttle close, did you give it a ...

My inverter case was connected to gnd which was the 12V battery - My brain was fed isolated power but at some point I connected it to ground as well. Never had the problem you have. But there is 100s of hours of tuning the halls to make them work well. I honestly had 1000s of hours into tuning it t...

Hall sensor spacing looks perfect (codes 1 to 6 have near perfect 60 degree spacing, when you go 5 to 1 to 3 to 2 to 6 to 4 to 5 etc), i would not change them. Strange is that code 1 and 6 are not in use, this may explain your strange behavior of point 1. Did you turn them off ? Just turn those bac...

Hall sensors are working now. I learned to calibrate them and set their offset. While they work and inverter has good behaviour specially in assisted sensorless mode i still have some issues. 1. When i calibrate hall sensors and setup offset i try to run in hall mode from reset. That goes well from ...

Yes I think you got it right with 4 teeth seperation. One of the better resources for Hall sensor placement. http://mitrocketscience.blogspot.com/2011/08/hall-effect-sensor-placement-for.html The key thing to remember is the motor needs to be commutated at 120 degree electrical. So the Leaf motor h...

Arlo1 wrote: ↑

Apr 04 2019 9:33pm

Yes You need battery voltage input to brain just not phase voltage

Can you elaborate what do you use that for? And how?
You use isolated opamp to sense voltage for precharge only or do you actually use it to sense analog 2.5V to 5V for controler information?

tnx

A