Search found 180 matches

by marcos
Feb 12, 2018 6:18 pm
Forum: Motor Technology
Topic: Current Sensors How to select a good one or roll your own.
Replies: 55
Views: 2950

Re: Current Sensors How to select a good one or roll your own.

J3 connector has 5v power input, Signal output (0A=2.5v), and GND. top level.png https://endless-sphere.com/forums/download/file.php?mode=view&id=228617&sid=6fd8cc5c2beebb48b4ff1a8153dcebcf I'm not mentally prepared yet to upgrade to the latest kicad nighties because of the new library remapping. Wi...
by marcos
Jan 28, 2018 4:07 pm
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 144
Views: 9679

Re: OSHW TO247 IGBT watercooled laminated half-bridge

Oh sure. I just remember HighHopes telling me to NOT use even a testpoint in the gate driver trace. I imagine his face transforming when I tell him I'm about to connect a inductance to the gate trace :p
by marcos
Jan 28, 2018 9:14 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 144
Views: 9679

Re: OSHW TO247 IGBT watercooled laminated half-bridge

It looks impossible to achieve if you have several parallel devices, however its doable if you are using a module. I would like to have a picture of their setup so I can see which point they choose to increase the stray inductance. If that loop is too large it will become susceptible to EMI, and its...
by marcos
Jan 27, 2018 6:48 pm
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

Yes, to get my hands on the FPGA I need either free time, a huge motor or someone to pay for the job, its a ton of effort for 1 person. The protected GPIOs were added for fan/pump and relays/contactors, so yes, the plan is to use them. DC discharge should not be in control of the microcontroller. DC...
by marcos
Jan 24, 2018 11:21 am
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

Nice job Marcos looks good! Any release date prevision for the future magic? Oh, its not an earth-shaking feature, don't worry. The focus now is in the packaging so we can offer more than a populated OSH pcb. No release date, I want it now so we can sell and fund more development, but its not that ...
by marcos
Jan 23, 2018 10:42 pm
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

After thinking about controller packaging I came to realize that the first 2 versions couldn't be used without those green phoenix terminal blocks. You were able to piggyback the control board into a powerstage but you end stuck using those green screw terminals, no freedom to choose your signal con...
by marcos
Jan 18, 2018 5:23 pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 70
Views: 1983

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

P1 silkscreen on the wrong side P3 and P5 are probably connected to chassis. There is exposed copper like 1mm away with battery voltage. Do those external dimensions fit nicely in an enclosure? extruded for example. I see no clearance on the edges to slide it into an extruded enclosure. board ID? ve...
by marcos
Jan 17, 2018 10:58 pm
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

This week I need to define some mechanical assembly stuff so next week I can get my hands on the control board and unblock that thread, many people are waiting for it. We also have a chinese new year coming which will delay the pcb assembly. The coolest builds come from customers because its a capit...
by marcos
Jan 17, 2018 9:30 pm
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

Hold on a bit of you can. This project is getting very very awesome and I'm spending a lot of time on it. A LOT. Just not posting news here until I have the new hardware working, its all about the wow factor. So far next version will have same mounting points and same schematic, but I need some chan...
by marcos
Jan 17, 2018 5:52 pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 70
Views: 1983

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

These could save the day. Saved mine back in the day.

https://www.digikey.com/product-detail/ ... ND/2746023

It constrains you to 1.6mm thick pcb though.
by marcos
Jan 17, 2018 4:53 pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 70
Views: 1983

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Thats the one position I tried, gave DRC error.. Thats why you first define your assembly and mounting points and then you do layout :mrgreen: . I wish I could help you there. Don't you need through holes on the big terminals of the current sensors? Looks like you exposed the copper to use both lay...
by marcos
Jan 15, 2018 4:17 pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 70
Views: 1983

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

2 quick notes, one silly, one not. * looks like the current sensor footprint lacks the large thrugh hole pads. * Can you guys add a mounting point to the control board? if its only supported by a header you're looking for troubles, you want a screw in there, at least one like m.2 . Especially with w...
by marcos
Jan 13, 2018 3:43 pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 70
Views: 1983

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

By default you get 1.6mm thick pcbs, you can order a thinner pcb, like 1mm thick which will easily lower the inductance. 1mm is still pretty rigid. At 0.8mm you get some flex which may or may not affect you, depends on components weight but mostly in pcb mounting points.
by marcos
Jan 09, 2018 9:30 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 144
Views: 9679

Re: OSHW TO247 IGBT watercooled laminated half-bridge

Great catch, thanks for sharing. Its worth a try I think.
by marcos
Jan 09, 2018 8:37 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 144
Views: 9679

Re: OSHW TO247 IGBT watercooled laminated half-bridge

Um, thats a cool IC. Can you order those from common suppliers?
The only thing I can see is worse than the TI chip is the common mode immunity, from the datasheet it makes it not suitable for driving SiC mosfets, and the ISO5852 is.
They have a good reputation, I'd trust that driver.
by marcos
Jan 09, 2018 6:13 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 144
Views: 9679

Re: OSHW TO247 IGBT watercooled laminated half-bridge

Thanks for the input AAC is implemented at asic level by the company that developed it so even though I have seen the whitepaper and I have here an AAC enabled driver, I'm not confident I can get such circuit working. About dynamic active clamping, adding a capacitor to set the timing of critical me...
by marcos
Jan 03, 2018 5:41 pm
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

I'd like to see a clear line in the top level showing where the isolation is. Like with a couple of clear blue lines showing the isolation. other than that I don't see any particular issue with the gate driver. About my half bridge (btw not the same as an H bridge) that PWM connection was very on pu...
by marcos
Dec 31, 2017 5:54 pm
Forum: Motor Technology
Topic: 144Vdc EV Charger
Replies: 78
Views: 5453

Re: 144Vdc EV Charger

400V for the win.

And the age-old question... does size matter? Of course in the context of choosing the switching frequency. 20khz to avoid noise... 200khz to make it lightweight?

Glad to hear this thread might come back in 2018.
by marcos
Dec 31, 2017 5:44 pm
Forum: Motor Technology
Topic: Converting a controller from 48v to 72v
Replies: 4
Views: 243

Re: Converting a controller from 48v to 72v

Its probably too difficult to do it right. But before trying, keep in mind that higher voltage means higher RPM, and exactly the same torque.
If you want more torque you need more amps or different gearing.
by marcos
Dec 27, 2017 4:35 am
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

Yes, to this git repo I will only accept boards made with kicad
by marcos
Dec 26, 2017 10:40 pm
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

I can try designing an interface board. If you need another tester I could throw it into a motorcycle frame and put it through it's paces :lol: I can try to help. If its quality work I can add it to the repo It would be cool if we could use induction motors, they're real cheap from any industrial s...
by marcos
Dec 26, 2017 8:57 pm
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

Welcome along! I think this motordrive would get the most benefit from testing. So far it has been under test in our lab, with a propeller load and in a very cool EV. There are some firmware and GUI tasks to do but I'm afraid if it takes you a week and benjamin commits it at the same time spending 1...
by marcos
Dec 23, 2017 10:38 am
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

ENNOID, watch out, the wolfspeed schematic you took as a reference is intended for SiC drives, with very fast rise times. Take a very close look at your blanking capacitor, if you DNP it you could have the desat triggered because your IGBT is much slower than a SiC switch. 100pF is a reasonable valu...
by marcos
Dec 21, 2017 6:34 am
Forum: Motor Technology
Topic: Current Sensors How to select a good one or roll your own.
Replies: 55
Views: 2950

Re: Current Sensors How to select a good one or roll your own.

Great to hear. 6 days ago I gently reminded Isabellenhuete about the shunt samples I asked for and after some checking they told me they will ship around christmas (ship to argentina). I'm not building pcbs until have samples in my hand. The samples I asked for are 2000A shunts that are not actually...
by marcos
Dec 19, 2017 9:50 am
Forum: Motor Technology
Topic: VESC-controller
Replies: 104
Views: 11276

Re: VESC-controller

About your series gate resistors. I see you used a melf package, you need a non-inductive resistor and those are often wound which effectively makes them a coil, unless you order a more expensive non-inductive flavor that has half of the turns in one direction and the other half in the other directi...