Search found 323 matches

by marcos
Feb 01 2020 12:25pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 36
Views: 3532

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

During double pulse test you want to look at the gate that is kept always off. Here you can see how the gate turn on looks like. Also, when you make RgOFF larger (slower turn off, less overshoot) you are making miller turn on worse because driver loses strength to keep the gate at 0V, so its not a s...
by marcos
Jan 31 2020 10:41pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 36
Views: 3532

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

Slowing down the switching won't hurt much if you don't use very high switching freq like 25+kHz. High end VESCs often switch at 25 or 30khz because the observer works better with more sampling per second, but you can halve that by sampling on both V4 and V7. Its important to take a look at the gate...
by marcos
Jan 21 2020 12:59pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

Hello, someone has tested FF600R06ME3 from aliexpress?, prices are 1/4 the price at mouser! about 40€, is it possible? Most likely counterfeit, and most likely its not worth the risk if a total fire costs you more that what you saved in those IGBTs. On other news, we got merged some features for be...
by marcos
Jan 11 2020 4:31pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 233
Views: 25401

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

Instant kills are usually caused by overvoltage or shoot through events, both can be seen in a double pulse test. Before performing any high power test your gate drive should be tuned based on your double pulse test results. If the long gate traces are too susceptible you will have to reduce the gat...
by marcos
Dec 14 2019 8:38am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

Hey marcos what is status of MTPA and flux weakning. I want to test switched reluctance IPM motor on this controller. That branch is quite behind the latest master branch, and requires you to build both vesc firmware and vesc tool in order to have the features. FW still lacks a safety feature that ...
by marcos
Dec 07 2019 10:51pm
Forum: Motor Technology
Topic: Max erpm and field wakening
Replies: 11
Views: 1429

Re: Max erpm and field wakening

Different conceps there * Max eRPM refers to the base frequency of the motor drive. If controller states 60kerpm then its PWM can generate 1kHz sinewaves while keeping the motor under control. * Max switching freq refers to the transistor switching freq, it could be 15, 18, 21kHz for example. Note h...
by marcos
Nov 22 2019 10:15am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

The Axiom part starts at 13:15 in the video. Soooo good to see you together on the stage, deep respect and congrats! The whole thing was an awesome meetup, and it was great to have the chance to finally have a team meeting, here are 4 glasses for maxi that didn't make it. 20191116_134321.jpg Btw I ...
by marcos
Nov 03 2019 10:26pm
Forum: Motor Technology
Topic: Sensorless From Standstill (SFS) explained
Replies: 24
Views: 2469

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 so...
by marcos
Oct 28 2019 7:22am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

I thought VESC already supports multiple VESC with multiple motors over CAN? Is that not what Vedder describes as Arrays of VESCs or are we limited to an array of two VESCs only in Version 6? How do they implement e.g. 4wd skateboard with 4 VESC & 4 Motors? Are they simply running 4 motors off two ...
by marcos
Oct 22 2019 9:31am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

Does this controller have the ability to daisy chain, so if you had 4 motors, and 4 controllers, you could connect the throttle to one acting as the master controller, which would send data to the other 3? Everything is possible. The only limit is your imagination and your time. And the flash memor...
by marcos
Oct 16 2019 4:54pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

I watched one of Arlin's videos on the Axiom he's using in his Honda and he suggests there might be Torque Vectoring possible/coming? I assume Traction Control is already possible through VESC software anyway, but are there plans for Torque Vectoring to be available or is Arlin developing this just...
by marcos
Sep 30 2019 5:14pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

would like to ask also any update on the pcb that would let us adapt let say already built powerstage from some inverter to the axiom logic board? No updates in that regard. I have the kicad files ready to upload, they didn't change since we defined the general layout and pinout. I just never made ...
by marcos
Sep 30 2019 9:48am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

Hello MArcos, could you please provide some updates on what is going on with Axiom? any updates on ACIM support? Hi Shaggy, These last few days we were making the last strides in the hackaday contest, it closes today. One of the requirements is to make a video so we are spending the bootstrapping s...
by marcos
Sep 25 2019 5:08am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

Yes! Right after we finish validation and we have an enclosure made.
by marcos
Sep 10 2019 4:39pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

Into the finals!

https://prize.supplyframe.com

Wooot! Happy happy!

Now back to work. Dang SPI driver speedup is taking me ages to get working.
by marcos
Sep 09 2019 8:57pm
Forum: Motor Technology
Topic: most power dense reliable esc available today
Replies: 4
Views: 355

Re: most power dense reliable esc available today

An old leaf motor can reach 200kw for a few seconds.
by marcos
Sep 09 2019 4:55pm
Forum: Motor Technology
Topic: most power dense reliable esc available today
Replies: 4
Views: 355

Re: most power dense reliable esc available today

It would be useful to also specify the current/voltage range you need. There are compact 200kW drives out there, but its worthless if you need 10kW.
by marcos
Sep 09 2019 4:40pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

@marcos good to see this released! One question though. Why use a digital isolator + non-isolated CAN transceiver instead of an isolated CAN transceiver like the ISO1042? Main reason is sourceability, if that is a word. I prefer to avoid part obsolescence and keep supply chain flexible. ISO1050 and...
by marcos
Aug 20 2019 9:28am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 577
Views: 101279

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

Ugh, I'm sorry if that came the wrong way at that time. If you ever would like to give this hardware a try I'd happy to give you a walk through the coding workflow, at least the workflow I use which of course may not be the best. The code is not ready to support paid options as it hasn't been a prio...
by marcos
Aug 19 2019 4:54pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 577
Views: 101279

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

I think I asked Lebowski if he wanted to try his algorithms in our board, but we code in C and he codes in assembler.
I agree it would be cool, and we also have the fpga available for custom functionalities that he could monetize as optional features.
by marcos
Aug 18 2019 6:39am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 577
Views: 101279

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

Its conceptually the same as KV (rpm per volt). It spins the motor and measure BEMF to calculate it. KV and mWb only differ by a conversion constant.
by marcos
Aug 15 2019 7:46am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

I also watch batteries ... I realized one thing if you maky it yourself it will be very expensive (battery pack) ... but i found battery pack is really cheap from ( Kia Optima Hyundai Sonata Hybrid Battery ) ... cost approximately 350-500$ Yes, keep watching. From time to time some amazing deals sh...
by marcos
Aug 06 2019 3:49pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 233
Views: 25401

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

You want to know exactly which enclosure you are going to use, with exact dimensions, 3D model, availability, and cost, and make sure you include the post-processing it needs for connector cutouts. This process can unveil some challenges I see like how to expose the JST connectors, or how to screw t...
by marcos
Jul 30 2019 5:49pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 414
Views: 83592

Re: Axiom: a 100kW+ motor controller

There are no pullups in the schematic for the HALL sensors. Maybe your sensors are open drain and need that? The overvoltage is on purpose, its there so you can't use the default mcconf hardcoded in the firmware. Go to general->advanced and set up a reasonable max input voltage for your system, and ...