Search found 169 matches

by shaman
May 22 2019 2:44pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

qwerkus wrote:
May 22 2019 2:06pm
I need a new 1000W 54V controller anyway.
I'm glad that team is interested! However, you and that team may want to wait for my newer controllers. The new ones are estimated to handle up to 84V and use the better VESC 6 platform. 54V doesn't leave much margin for the Cheap FOCer.
by shaman
May 22 2019 1:58pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

How are things progressing ? Very well actually. One of the beta testers has done several test runs while gathering great data. So far the Cheap FOCer is performing as well as any other VESC 4.12 based design. It does run much cooler than other VESC controllers even with minimal heatsinking. I'm su...
by shaman
May 21 2019 8:11am
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

Which ones? From what I see on your github photos, you are using Mini-PV (aka Dupont) for this project. There are other 0.1" (2.54mm) pitch connectors out there. Here's some below for example. Use whatever you want https://www.aliexpress.com/item/32952337808.html?spm=2114.search0604.3.9.13005d26p2T...
by shaman
May 20 2019 7:52am
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 89
Views: 5000

Re: BESC - beefed up VESC motor controller for high power ebikes

galp wrote:
May 19 2019 4:40pm
If you want to donate, you can use this link: https://paypal.me/GalPavlin
Beer money sent!
by shaman
May 20 2019 7:45am
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 89
Views: 5000

Re: BESC - beefed up VESC motor controller for high power ebikes

Final board dimensions are set at 231x67 mm. I'll also have to find an aluminum housing to fit this thing inside. It should have internal dimensions at least 80 x 240 x 40 mm (WxDxH). Any recommendations? There are many options of extruded aluminum enclosures on AliExpress. The vendor from the link...
by shaman
May 19 2019 8:00pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

1. Have you considered going for 12 mosfets from the start? 10+ and we get the first volume discount, thus paying less in total for better effect in the end. I'm doing a 12 FET version for my newer controller design. Have you found where 12 FETs are cheaper than the 6 FETs even with the 10unit pric...
by shaman
May 13 2019 6:26pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

Are the files on Github good enough for that, or are there some fixes that haven't made it in etc. Is there something else I should be aware of (other than it's a beta stuff might break) ? The only thing wrong I've found so far is the lack of 5V connected to pin 2 of the SERVO header. You can see t...
by shaman
May 10 2019 9:16am
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

TEK0000.JPG Switch Node @Vsupply = 54V Ok so I fired up the beta version in the lab. @54V there was only a spike of 55.6V at no-load. This is much better than the prototype and is most likely due to the improved layout. The owner of the dyno I was using before is currently using it for his own test...
by shaman
May 08 2019 2:40pm
Forum: Battery Technology
Topic: soldering vs spot welding debate
Replies: 75
Views: 11539

Re: soldering vs spot welding debate

liveforphysics wrote:
May 08 2019 1:40pm
We have many examples of good designs and terrible designs at accomplishing cell pressure interconnects.
I'll do my best to find the good designs on the forum. Could I ask you to maybe point out some good examples?
by shaman
May 08 2019 1:34pm
Forum: Battery Technology
Topic: soldering vs spot welding debate
Replies: 75
Views: 11539

Re: soldering vs spot welding debate

Soldering packs is for applications where you don't care if it even works once, random self-discharge levels are acceptable, and random failure in a short time is desired. Spot welding (to the bottoms of cans) is for when you don't care about leaking electrolyte out of the can from the stress riser...
by shaman
May 03 2019 8:32pm
Forum: Motor Technology
Topic: VESC controller: Check Axiom datasheet!
Replies: 335
Views: 44395

Re: VESC-controller: Axiom hardware released!

Damn you guys are kicking ass! Field weakening has been a long time wanted feature for the VESC platform. Would you be able to tell us some of the downsides to field weakening besides the drop off of torque?
by shaman
May 03 2019 5:14pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

Beta Cheap FOCers.jpeg

The beta testers and I are starting to receive the beta controllers in the mail. I’ll be testing one of mine in the lab next week to see if there are any improvements over the proto-FOCer. I’ll be posting results here just as I’ve done in the past.
by shaman
May 03 2019 5:13pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

@nieles I may take you up in that offer if I don't do any good on my own. I appreciate it!
by shaman
Apr 26 2019 7:58pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 58
Views: 2782

Re: Serious FOCer (84V VESC 6 based controller)

Do you think this board will be able to support 150A phase to test high power devices to the leg limits of the package? Maybe. It's all going to be about for how long it could do it. 30s? 30mS? Calculating something like this generally explodes into a massive cloud of variables, assumptions, and ev...
by shaman
Apr 24 2019 11:24am
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 89
Views: 5000

Re: BESC - beefed up VESC motor controller for high power ebikes

Wonderful! Can't wait to review these changes later today. I like the integrated 12V supply. Keep up the good work! It's makes doing my spin-off of this easier :)
by shaman
Apr 23 2019 7:37am
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 89
Views: 5000

Re: BESC - beefed up VESC motor controller for high power ebikes

I don't know anybody that charges LIPO or LION to 4.2v per cell. 20S=84v is unrealistic. https://cdn.shopify.com/s/files/1/0674/3651/files/lg-hg2-spec-sheet.pdf It may be easy for someone to assume that one charges LIPO/LION cells to 4.2V. Datasheets often state this to be the max charging voltage ...
by shaman
Apr 22 2019 5:31pm
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 89
Views: 5000

Re: BESC - beefed up VESC motor controller for high power ebikes

AKA good components hold up to over watting and abuse better than cheap parts. There are still some "gotchas" behind this. Yes reputable semiconductor companies often derate their devices to ensure reliability over full temp range or other environment conditions. Yes you may be able to exceed Vmax ...
by shaman
Apr 11 2019 5:13pm
Forum: Motor Technology
Topic: VESC controller: Check Axiom datasheet!
Replies: 335
Views: 44395

Re: VESC-controller: Axiom hardware released!

motherofgod.jpg
motherofgod.jpg (58.28 KiB) Viewed 1711 times
The magnitude of engineering, research, and development here is astonishing! This Axiom controller is going to make some serious waves in the EV world. Congratulations to @marcos and team for cranking out this gem. I wanna be like you guys when I grow up.
by shaman
Apr 11 2019 9:28am
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 89
Views: 5000

Re: BESC - beefed up VESC motor controller for high power ebikes

@galp Do you know if there is a significant difference between polyester caps and polypropylene caps? Most documents I've found points toward metallized polypropylene for DC link in motor drives but I have no experience to base my opinion off of. Also the package of the referenced capacitor is refer...
by shaman
Apr 11 2019 8:01am
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 89
Views: 5000

Re: BESC - beefed up VESC motor controller for high power ebikes

galp wrote:
Apr 05 2019 2:12pm
I'll be using 6x 22 uF film caps
Which film caps are these?
by shaman
Apr 11 2019 12:06am
Forum: Polls & Surveys
Topic: If you could do something entrepreneurial in the EV industry,what would you do?
Replies: 8
Views: 505

Re: If you could do something entrepreneurial in the EV industry,what would you do?

1. Create effective open source EV technology to help accelerate overall EV awareness, implementation, and development. Establish reputation on niche forums by announcing development, providing updates, and accepting feedback. Start small webstore that sells open source EV hardware. Not fret over Ch...
by shaman
Apr 10 2019 5:13pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

Thanks! Honestly this project file in Altium is sort of crappy and is a patchwork job due to a lot of constraints I had to deal with while designing in Altium. I may attempt to convert it to a KiCAD project file using the Altium2kicad plugin. Altium, and it's particular flavor I have from my company...
by shaman
Apr 10 2019 1:44pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 194
Views: 9099

Re: Cheap FOCer (VESC 4.12 based design)

https://github.com/shamansystems/Cheap-FOCer

Ok. So I finally got the GitHub repository up. The schematics and silk screen on the PCB still need some cleaning up on my end but at least this is something. I’ll be cleaning up the files and repository as we progress through the beta testing process.
by shaman
Apr 08 2019 9:28am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 58
Views: 2782

Re: Serious FOCer (84V VESC 6 based controller)

The 100V TO-220 I am seeking to use is the NCEP01T18 by WUXI NCE Power Semiconductor. They're a manufacturer in China but they seem to have decent products. LCSC stocks some if their products but not all. I intend to contact them when I'm ready for production. If they don't turn out to work, then in...
by shaman
Apr 08 2019 8:05am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 58
Views: 2782

Re: Serious FOCer (84V VESC 6 based controller)

The DRV8353RS can only do 12 of these TO-247 FETs at a max of 20kHz for FOC. Higher switching frequencies is too much for the DRV with FETS of a gate charge this size. Higher power is better achieved with TO-220 FETs in parallel for this DRV. I can better do a 18 TO-220 FET controller than a 12 TO-2...