Search found 335 matches

by shaman
Dec 20 2020 9:47pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

Update: It's been a while but the project is not dead! Beta testing has been going well and I'm moving forward with a manufacturer for the Little FOCer. Getting stuff manufactured takes a while. Especially to quality check everything. I’ve got samples from the manufacturer on their way. The samples ...
by shaman
Oct 28 2020 10:20pm
Forum: Motor Technology
Topic: BLDC motors mechanically coupled
Replies: 5
Views: 463

Re: BLDC motors mechanically coupled

Check out any VESC based controller. They can connect to each other over a CAN bus and operate multiple motors in sync. the electric skateboard builders do it all the time. eRPM between the two motors are kept within a tight difference.
by shaman
Sep 24 2020 1:23pm
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 167
Views: 35550

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

The Serious FOCer is lined up to have TO-247 MOSFETs but only 6 of them. Good for 150A max motor phase and not much larger than the Little FOCer.

There's a different model in the works w/ 12 TO-247 MOSFETs but that's a closed topic for now.
by shaman
Sep 13 2020 6:29pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

@qwerkus that's a pretty cool concept actually. I've designed the board in a way so that caps and connectors can be soldered on the opposite sides to that this kind of thing is possible.
by shaman
Aug 20 2020 8:14am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

Tricky size for a cheap szomk box - maybe that statement about expensive cnced enclosures will change... Not going for the extruded enclosure. Just the extruded heat sink like in the photo and the whole thing capped by a plastic top. You can kind of see that in the last pic from my previous post. S...
by shaman
Aug 19 2020 2:37pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

Yeah it’s more compact than typical ebike controllers and the power density is far higher. It’s half the size of a cheap “1000W, 48V” controller. Still distinct from most VESC based stuff due to the through hole MOSFETs and not super expensive CNCed enclosures Dimensions are 83.8 x 72.1 x 42 (mm) wi...
by shaman
Aug 18 2020 9:22am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

img_1918.jpg IMG_1917__1597760403_47.42.73.206.jpg IMG_1661__1597760422_47.42.73.206.jpg Still making progress however slow it is. I've got the materials for a beta unit batch and I've been analyzing performance with different MOSFETs. So far so good. Thermal performance is good and I've tested wit...
by shaman
Jul 16 2020 12:02pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9954

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)

@SRFirefox nice test and thanks for sharing! 1.39uH is a challenge. Out of curiosity, have you tried increasing the switching frequency for FOC to see if it reduces the heating? You could try bumping it up to 30 or 40kHz.
by shaman
Jul 15 2020 6:14pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

@motordriver111 I appreciate the donation but unfortunately I will not be sharing the design files. If you would like an open source controller where I share everything, please see my Cheap FOCer 2 (CFOC2) thread. All files are available on github for the CFOC2,
by shaman
Jun 22 2020 7:57pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 483
Views: 116253

Re: Axiom: a 100kW+ motor controller

One trick you can do is set the FOC frequency to a very low value, 5kHz for example. The lower you go the closer your measurement is to a vesc original hardware. Its still not ideal and it can be improved for sure, but it takes effort to develop a solution for that because its a hard problem, can't...
by shaman
Jun 22 2020 12:52pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 483
Views: 116253

Re: Axiom: a 100kW+ motor controller

@HighHopes or at @marcos How do you guys deal with the VESC's non-ideal behavior with slower-switching hardware? I've been able to observe in my own testing that the VESC firmware depends on hardware that switches really fast in order for the motor detection and control to perform as expected. I saw...
by shaman
Jun 17 2020 6:34am
Forum: EBike Technical
Topic: XLD Brainpower 886C-6 / LCDS886 - NOT Reversible?
Replies: 12
Views: 310

Re: Cheap FOCer (VESC 4.12 based design)

Ok. So your problem is that you’re not using a CFOC or CFOC2 controller.
by shaman
Jun 12 2020 12:09pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 483
Views: 116253

Re: Axiom: a 100kW+ motor controller

Understood! Thanks for doing y’all’s part to get it into the VESC firmware. So many good contributions have come from the Axiom team. Now if we could just get the motor detection algorithm to deal with slower switching power stages better....
by shaman
Jun 12 2020 9:04am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 483
Views: 116253

Re: Axiom: a 100kW+ motor controller

That’s a really nice feature! I’m familiar with the concept of reluctance due to the motors Tesla uses now but I didn’t know it could be exploited to improve IPM performance.

Any chance this feature will make it to the main VESC firmware or will it be Axiom exclusive?
by shaman
May 30 2020 9:07am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

I know I've given some timelines and expectations that didn't turn out to be true or were unrealistic to begin with. Here's some of the main issues contributing to the hold up on this stuff. 1. I can't do this full time. My hours have been split between my full time job (electrical engineer), my par...
by shaman
May 06 2020 6:56am
Forum: EBike Reviews & Testing
Topic: Sabvoton MQCON review and documents
Replies: 44
Views: 21213

Re: Sabvoton MQCON review and documents

@ElectricGod

Any chance of re-uploading the images or passing them to me via PM?
by shaman
May 06 2020 6:50am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

I appreciate you taking the time to read! So both...no kids + long hours. This is for sure my passion. The Little FOCer hasn't shown issues with the 2512 sense resistors and I've taken it up to 90 amps. However I did switch to size 3920 for anything larger for up to 150A. Anything more will require ...
by shaman
May 01 2020 6:00pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9954

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)

https://github.com/shamansystems/Cheap-FOCer-2 I’m happy to finally announce the v0.9 release of the Cheap FOCer 2! Special thanks to @bj97301, @NuRxG, and @Davewesh at the esk8 builders forum for formatting the repo into something truly outstanding, much better organized, and readable by humans. Re...
by shaman
Apr 18 2020 10:29am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9954

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)

GitHub repo created and under review. It's private for now until after the review is done. This most recent rev has been working fine in my ebike with 70A motor current. Still making some firmware tweaks before release.
by shaman
Apr 05 2020 12:20pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

@Kalzifa this controller will only do 20S as advertised. Trying for 26s would call for a complete redesign and not just changing out FETs and caps. You might be interested in galp's BESC. It is made for higher voltage
by shaman
Apr 03 2020 11:52am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

Kits are still being considered for a few reasons. I might do a limited production run of some kits after beta testing. The idea is to test out production and customer support for that sort of thing.
by shaman
Apr 02 2020 10:45pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

trial-run.jpg Trial run around the block. Went up to 37mph ebike.jpg janky ebike I threw together to test stuff. 10s batteries in series for a 20s battery. Well I took it around the block a bit. 60A FOC starting at 82ish volts. No issues. I'll be taking it out on a straight road tomorrow when its d...
by shaman
Apr 02 2020 4:53pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

Well let's say i'm getting it dialed in. I'll throw it on my ebike with a 20s battery in a coupe of days. Special thanks to @zombiess for helping with the gate drive strength tuning.
by shaman
Apr 01 2020 11:49pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 287
Views: 44687

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

SDS00020.jpg
SDS00020.jpg (76.4 KiB) Viewed 2193 times
Slow but steady. I'm still working this...
by shaman
Mar 18 2020 8:47am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9954

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)

cheap focer 2 new rev .jpeg New rev arrived. Will assemble this and put a scope to it like the other. I made some small gate drive improvements so I want to see if that made a difference. I also want to optimize dead time. Dead time can be set with hardware or firmware. My controller switches a bit...