Search found 3258 matches

by Lebowski
Feb 16 2020 1:49pm
Forum: General Discussion
Topic: Discussions aren't the same quality without Chalo
Replies: 72
Views: 3989

Re: Discussions aren't the same quality without Chalo

P.s. with an outfit like that you just KNOW Chalo is making moonshine in the woods :D
by Lebowski
Feb 16 2020 1:47pm
Forum: General Discussion
Topic: Discussions aren't the same quality without Chalo
Replies: 72
Views: 3989

Re: Discussions aren't the same quality without Chalo

I think it is bad practise to ban people like Chalo... people like me who are old hands at ebikes dont come here for the info anymore... we come here for the friendly banter and the characters (like C). You ban those people, no reason for me to show up here anymore. I mean there is only so many time...
by Lebowski
Feb 13 2020 2:20am
Forum: E-Vehicles General Discussion
Topic: "Hobbyist" Motor Controllers?
Replies: 3
Views: 143

Re: "Hobbyist" Motor Controllers?

Some people build a controller using a salvaged power stage and a general motor controller brain chip: http://endless-sphere.com/forums/viewto ... 378d34adb7

40hp is easy, numbers as high as 300hp (at the wheel) have been reported using setups like this.
by Lebowski
Feb 03 2020 3:49am
Forum: Motor Technology
Topic: Winding Question: does STAR make more torque than DELTA, even with adjusted phase current?
Replies: 17
Views: 1132

Re: Winding Question: does STAR make more torque than DELTA, even with adjusted phase current?

To correct, I did not say motor BEMF and controller waveforms should match, I tried this for a while but came back on this as there is no point. Power comes from the motors backemf voltage and current being in phase. Lets say the motor has fundamental sine wave and a 3rd harmonic (making it mildly t...
by Lebowski
Jan 09 2020 3:33pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 67
Views: 5758

Re: Ampera/Volt inverter with Lebowski brain

When reset is pressed it will shut down the output stage, turning off all FETs/IGBTs . If you are using field weakening and motor speed is higher than the battery would normally allow, roughly the at that moment used field weakening current will be delivered by the motor to the battery (via the FETs...
by Lebowski
Dec 28 2019 4:39pm
Forum: General Discussion
Topic: planted Red Malabar Spinach -, planted 100 broccoli seeds direct, transplanted 14 broccoli
Replies: 18
Views: 2003

Re: planted Red Malabar Spinach -, planted 100 broccoli seeds direct

Once tried growing coliflowers in a plant pot... they came up and grew to about golf ball size, but did not get any bigger ... ? What could have been the cause ?
by Lebowski
Dec 28 2019 5:15am
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 67
Views: 5758

Re: Ampera/Volt inverter with Lebowski brain

Confidence at 6 shows there is a lot of noise on the hall signals, if you scope them theyll probably look messy..

Calibrating the sensor to 0 is not necessary, as the controller IC can deal with offset. The number of pole pairs in the RLS and motor should match though.
by Lebowski
Dec 16 2019 2:23pm
Forum: Motor Technology
Topic: Ampera/Volt inverter with Lebowski brain
Replies: 67
Views: 5758

Re: Ampera/Volt inverter with Lebowski brain

Do the current sensor offset values make sense ? And the hall sensor results, are they reasonable ?
by Lebowski
Nov 24 2019 2:13am
Forum: E-Bike General Discussion
Topic: Love the Baserunner, suggested improvements
Replies: 24
Views: 3227

Re: Love the Baserunner, suggested improvements

viewtopic.php?f=30&t=103025

Adding the tech from the link above would be an improvement :D Sensorless from Standstill with full torque, no more hall sensors !
by Lebowski
Nov 04 2019 1:41am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Re: Sensorless From Standstill (SFS) explained

That's a very awesome and valuable contribution Lebowski, thanks!! I'm not sure the STM32F4 can handle this non-center-alignement phase shift, I think it requires the coordination of many many timers. In any case, I sent the tip to benjamin vedder, we was considering this kind of signal injection s...
by Lebowski
Nov 01 2019 12:57pm
Forum: E-Bike General Discussion
Topic: Home-Built Ebike - Swiss Police Suspect Drugs!
Replies: 32
Views: 3098

Re: Home-Built Ebike - Swiss Police Suspect Drugs!

No more like habving to pay all expenses and damages out of your own pocket.. To just name a thing, parents can go broke here if the child does grafiti. They keep track of all grafiti tags and associated cleanup cost, and won't bat an eye and presenting the person with a several 100k cleanup bill wh...
by Lebowski
Nov 01 2019 9:18am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Re: Sensorless From Standstill (SFS) explained

Lebowskys, I'm totally with u in that point. But I wanted to point out what will be needed to just get away with digital filtering. And just to be clear I mean an enob of 16bit not a 16bit adc! some people may remember the v2 controller IC having an HF sensorless mode... that was the first time me ...
by Lebowski
Nov 01 2019 8:49am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Re: Sensorless From Standstill (SFS) explained

If u have a true 16bit signal u could eliminate the LNAs because the gain of 30dB of those LNAs is about 32x so that's 5 bits u need. And most current systems do not have the resolution for this. Even though the Rx part of this approach is novel compared to recent sensorless motor control literatur...
by Lebowski
Nov 01 2019 7:14am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Re: Sensorless From Standstill (SFS) explained

Or, Peters, if you have one extra ADC channel and dont use the 3 from the current sensors you can - do Clarke transform in the analog domain with no filtering and no gain, use those for you FOC control. Takes 2 ADC channels - build a 2 channel LNA using the Clarke transformed signals, the LNA output...
by Lebowski
Nov 01 2019 6:55am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Re: Sensorless From Standstill (SFS) explained

I think without LNA the bit where you determine the MSB (or: the 0-180 decision) will not work as the signal wil be too small. Plus the LNA limits the amount of harmonics sampled by the ADC and makes digital filtering easier. I would not go without LNA.
by Lebowski
Nov 01 2019 4:40am
Forum: E-Bike General Discussion
Topic: Home-Built Ebike - Swiss Police Suspect Drugs!
Replies: 32
Views: 3098

Re: Home-Built Ebike - Swiss Police Suspect Drugs!

Yep but one accident and your royally ..... here
by Lebowski
Oct 31 2019 9:12am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Re: Sensorless From Standstill (SFS) explained

john61ct wrote:
Oct 31 2019 8:59am
Is this tech something likely to see production units available within say a year?
Send the pdf of the first post to your favorite controller manufacturer and push him to build one !
by Lebowski
Oct 31 2019 8:56am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Re: Sensorless From Standstill (SFS) explained

Interesting. First what i thought - some sort of HFI However need for schematic changes and extra adc channel will increase BOM cost quite.. Also i'm using PWM techniques to lower power stage losses tat is not applicable to this SFS The 33EV I used has a lot of ADC input, 9 or 11, am not really sur...
by Lebowski
Oct 31 2019 1:43am
Forum: E-Bike General Discussion
Topic: Home-Built Ebike - Swiss Police Suspect Drugs!
Replies: 32
Views: 3098

Re: Home-Built Ebike - Swiss Police Suspect Drugs!

Still, I bet you the policae are having a blast with that thing in their parking lot... with the small rear wheel and a bit of power it should be easy to power wheely :D
by Lebowski
Oct 30 2019 5:03am
Forum: E-Bike General Discussion
Topic: Home-Built Ebike - Swiss Police Suspect Drugs!
Replies: 32
Views: 3098

Re: Home-Built Ebike - Swiss Police Suspect Drugs!

I love this thing, like how it looks and thing it would be a blast. The small wheel looks like it might have accidentally fallen out of one of the public rental scooters you see around here a lot. Member Emmgee actually lives direction Winterthur .... ? He does not come across as a drug sniffing dru...
by Lebowski
Oct 30 2019 4:35am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Re: Sensorless From Standstill (SFS) explained

Hi Bas, Thanks for releasing this, very interesting read. I thought you wanted to sell this IP, What made you change your mind? I've never really been sure about the legal situation of selling this technology. Because I don't know the motor control literature I cannot be sure the basic idea is not ...
by Lebowski
Oct 29 2019 12:17pm
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2467

Sensorless From Standstill (SFS) explained

The pdf attached to this first post describes the technology necessary to build a sensorless FOC controller that can run a motor from standstill or a cold start / reset with full torque. The algorithm it uses to find the rotor phase delivers a continuous rotor angle, not just 6 steps like you get fr...
by Lebowski
Oct 29 2019 7:49am
Forum: E-Bike General Discussion
Topic: Home-Built Ebike - Swiss Police Suspect Drugs!
Replies: 32
Views: 3098

Re: Home-Built Ebike - Swiss Police Suspect Drugs!

I deny everything, it wasn't me ! honest !
by Lebowski
Oct 22 2019 12:28am
Forum: EV Business World
Topic: Do you know this man ?
Replies: 14
Views: 1077

Re: Do you know this man ?

Looks like the guy from dukes of Hazard ?
by Lebowski
Oct 18 2019 12:08pm
Forum: General Discussion
Topic: Just had an earthquake in Los Angeles
Replies: 91
Views: 11046

Re: Just had an earthquake in Los Angeles

Am at the foot of a stonking great big vulcano here but luckily did not notice anything (Teide)...