Search found 311 matches

by shaman
Mar 18 2020 8:47am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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...
by shaman
Mar 16 2020 8:52am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

Beta unit batch.jpeg
Beta unit batch.jpeg (347.05 KiB) Viewed 401 times
Almost done with the beta units.

Also the newest rev should be in today. It should functionally the same plus the IMU capability.
by shaman
Mar 10 2020 9:51pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31643

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

This controller is meant to be a balance of DIY and DFM. The DIY kit should make the DIYers happy since they can solder some components themself and even choose which FETs to use if they wish. Yes figuring out a warranty for this type of thing may be difficult. I'll have to see what sort of warrant...
by shaman
Mar 10 2020 5:11pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31643

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

@qwerkus the pricing is different for 4 layer boards with ENIG and springing for the “extended components” in SMT assembly. Plus it’s low-quantity. If you want cheap, then check out my cheap FOCer 2 thread. I’m pretty sure I’ve discussed pricing already but I’m aiming for the little FOCer to be some...
by shaman
Mar 05 2020 11:00am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

Cheap FOCer 2 order.JPG Still working on the beta units but I've also ordered a prototype of the latest revision. The latest revision has an IMU, minor improvements to the gate drive, optional pullup/pulldown resistors on the ADC channels, and a wider PCB now at 60mm. The wider PCB fits the intende...
by shaman
Mar 05 2020 10:54am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31643

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

Little FOCer order.JPG Ordered some prototypes a couple of days ago for the Little FOCer after JLCPCB came back online 100%. I hope these do better with all the improvements. If they pass functional testing, I'm looking at having them double pulse tested. This will be good to really show the gate d...
by shaman
Mar 01 2020 1:55pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31643

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

@Addy yes I’m aware of the option of customizable lengths in extruded enclosures. Unfortunately it’s these extrusion designs that don’t optimize heatsinking for FETs mounted to the bottom. These designs tend to optimize heatsinking for FETs mounted to the side walls instead
by shaman
Feb 28 2020 10:20am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31643

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

I don't think interference would bother the FETs. If anything this wold bother the control side since it runs underneath that part of the PCB but I'll be accessing that. I've looked at the separated style enclosures before. No pre-made designs seem to offer the heat sinking qualities I'm after. They...
by shaman
Feb 26 2020 6:27pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31643

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

One expensive drv instead of 3 gate sub-cicuits. Makes sense. Yeah. There's pros and cons to this but I'm hoping it will work for this level of power under.jpg CFOC2 cables under2.jpg CFOC2 cables front entry So for the motor phase and possibly even battery cables, I think they can be routed undern...
by shaman
Feb 25 2020 1:52pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

CFOC2 betas.jpg
CFOC2 betas.jpg (334.77 KiB) Viewed 795 times
Beta batch in progress
CFOC2 betas 2.jpg
CFOC2 betas 2.jpg (386.63 KiB) Viewed 795 times
2 beta units. One with phase cables soldered in from the underside

Working on it.
by shaman
Feb 25 2020 8:36am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31643

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

Also FYI everyone I’m just waiting for JLCPCB to come back online 100%. They went down due to complications with the coronavirus and still don’t have their assembly service back up and running. I have plenty of work for them once they do though
by shaman
Feb 25 2020 6:48am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 250
Views: 31643

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

@qwerkus

Any of the VESCs or knockoff VESCs won't accommodate the new DRV8353. It's a different footprint and is has different registers for setup.There are many other differences between the old DRV and the new one that would prevent a simple swap but those are told in the datasheets.
by shaman
Feb 22 2020 9:01am
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 24
Views: 2092

Re: DIY Motor Dyno/load?

I've had several suggest just to use distilled water. Its cheap, easy cleanup, and I can flush it periodically to void impurity build up. Guess that's what I'll do. Maybe I can even make ice from distilled water to further cool the test setup. I will be using two of those QS 3000W mid drives. I thin...
by shaman
Feb 19 2020 2:53pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

@marcos thanks for the tips here. My fear is of the water becoming contaminated over time in a garage environment and becoming more conductive. I’ve thought about having the motors in a metal tub submerged in mineral oil. Then having that tub placed in a larger tub that is filled with ice water for ...
by shaman
Feb 18 2020 8:31pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

I think I'm going to bypass potential issues with water and submerge in mineral oil instead. I have a different thread where I'm discussing that in more detail.
by shaman
Feb 18 2020 7:40am
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 24
Views: 2092

Re: DIY Motor Dyno/load?

Intertial might be better. a Prony brake wont work here? The goal is to have a highly adjustable load that also run a test script through the VESC tool. A prony brake doesn’t give the flexibility of an electronically controlled load and its harder to keep cool. An inertial load doesn’t like it woul...
by shaman
Feb 18 2020 12:16am
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 24
Views: 2092

Re: DIY Motor Dyno/load?

The QS 3000W motor might be a good candidate too. I would buy 2, mount them side by side, and couple them together with a belt or chain. It’s all still tentative and I’ll be shopping a bit.
by shaman
Feb 17 2020 9:51am
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 24
Views: 2092

Re: DIY Motor Dyno/load?

coupling.JPG Ok so I threw something together with scrap wood and some cheap outrunners for proof of concept. It works. I'm able to control load torque with one motor/controller and then control driving torque with the other motor/controller. Makes for some decent testing of various conditions with...
by shaman
Feb 11 2020 11:02pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

SRFirefox wrote:
Feb 11 2020 6:52pm
You could dunk your motor in a tub of water to keep the heat down for the 50A test.
I don't know man. How do I know everything is waterproof up in that motor?
by shaman
Feb 11 2020 11:46am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

CFOC2 side.jpg FOCer sammich. Shows the way I mounted the FOCer to the heatsink. M3 screws, 4.5mm 3D printed spacers, and 0.5mm silicone thermal pad. CFOC2 5V.jpg Auxiliary 5V for fan goodness. Yes the connectors on the PCB are burnt/melted (don’t ask). You can also see the springy thing I made and...
by shaman
Feb 01 2020 1:01pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

Which FETs are you using on this board? I'm using the CSD18536KCS. I looked at the wrong datasheet earlier. The minimum turn on threshold is 1.8V http://www.ti.com/product/CSD18536KCS I also want to test with the NCEP60T20. It's a cheap FET that seems like it could work decent enough https://lcsc.c...
by shaman
Feb 01 2020 9:27am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

Thanks @marcos! Yeah these little TO-220 FETs can turn on at a minimum of 2V. I'll check out the gate voltage waveform to see whats going on and I'll post that. I figure I can increase the gate drive resistors a bit and also add a small capacitor from gate to source if need to be if the gate drive s...
by shaman
Jan 31 2020 8:59pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

turn off.jpg Rising edge (turn off) waveform FOC 50A at 50V turn on.jpg Falling edge (turn on) waveform FOC 50A at 50V Ok so those that have been with me since the Cheap FOCer 1 has seen something like this before. These are the scope shots that show the turn on and turn off of the MOSFETs at each ...
by shaman
Jan 31 2020 6:51pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

I want to finally mount the heatsink and gauge it's thermal performance with the intended heatsink both in still air and with a 5V 50mm fan that fits perfectly to the heatsink. I also want to get scope shots of the switching waveforms to see rise/fall times and the severity of the spikes. I still ha...
by shaman
Jan 30 2020 10:47pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)
Replies: 45
Views: 5515

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

image (1).png 50A motor phase current at 50V 50A.JPG 50A FOC current waveforms Finally got around to testing under load properly. I now have a neat test rig. Two motors mounted and coupled at the shaft(giggity). Each motor has it’s own controller. One motor provides braking torque(load). The other ...