Search found 3249 matches

by Lebowski
Nov 04 2019 1:41am
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 1073

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: 1573

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: 1073

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: 1073

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: 1073

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: 1073

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: 1573

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: 1073

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: 1073

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: 1573

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: 1573

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: 1073

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: 1073

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: 1573

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: 8
Views: 355

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: 9613

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)...
by Lebowski
Oct 08 2019 1:19pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 815
Views: 40661

Re: APL's DIY axial-flux motor

Lebowski, can you also explain a little more about 141 percent T? Basically you have the flux from the permanent magenets (100% T) and the flux from the coils. Lets say the flux from the coils at max phase current is also 100% T. These two fluxes are at a 90 degree angle of each other (for max torq...
by Lebowski
Oct 08 2019 12:29pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 815
Views: 40661

Re: APL's DIY axial-flux motor

I still think where the coils are wound the area should be minimal (based on flux and what material can hande, dont forget 141%), and round ! could you please explain a little why it is so important for coils to be round? in most radial flux motors i've seen the coils have almost rectangular shape ...
by Lebowski
Oct 06 2019 9:59am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 815
Views: 40661

Re: APL's DIY axial-flux motor

I still think where the coils are wound the area should be minimal (based on flux and what material can hande, dont forget 141%), and round !
by Lebowski
Oct 01 2019 1:50pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1794
Views: 205650

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Why build this boost converter and not just use field weakening ?

Arber, you want to measure after the boost converter, so at the power stages.
by Lebowski
Oct 01 2019 11:30am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1794
Views: 205650

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Arlo1 wrote:
Oct 01 2019 11:12am
Amber this needs to be isolated!

That's why I posted the circuit!
Depends on how far reaching you want your power stage blowup to be :wink:

Arber, i dont really understand the distinction beween the 400 and 650, but the controller ic needs to see the power stage supply voltage.
by Lebowski
Sep 30 2019 12:01pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 815
Views: 40661

Re: APL's DIY axial-flux motor

Still... your magnets make a certain flux. With the coil current flux rises to 1.41 times this. For this flux, keeping saturation in mind, you need a certain metal area. The smallest circumvence (wire length) your get for a circular area..
by Lebowski
Sep 30 2019 7:35am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1794
Views: 205650

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Arber, I think you misunderstand. When you want to deal with a 400 V battery you need to divide this voltage down by a factor 80. The controller IC will then work correctly for battery voltages between 200 and 400V, as these map in the 2.5 - 5 V range. You should not map 0 - 400V on 2.5 - 5V ! You'r...
by Lebowski
Sep 29 2019 2:53pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1794
Views: 205650

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

I use just a resistor, but Arlo1 haf a good isolating opamp in his high power design.

Yes it is programmed only for a range of 2, as that should cover a battery between empty and full ...? It needs to do a 1/x internally, the factor 2 is chosen to limit the output range of the 1/x calculation...