Recent content by wanders

I've been chatting with the CEO of Revonte regarding their drive. A few notes from our conversation: Yup, they are slow to market, and seem to be unconcerned about it. It looks like a very lean, small Finnish team with a very low burn rate to me. Their focus is getting into the Euro market in...

Thanks for the reply, Anapaza. Whether or not my XC846 is counterfeit / clone of an earlier Infineon uC, they were available widely circa 2009. And the EB812 board was supported in a (early?) version of Parameter Designer. I think they all come from Xie-Chang. And Knuckles had an extensive...

I sincerely appreciate the effort it took to reverse engineer the protocol and address map for XPD. Kudos to the OP and all who have contributed. I have an ecrazyman / Keywin controller (12 FET, XC846 controller, EB806XC-A-8 PCB) that I'm trying to get to work with my Cutler MAC hub motor. It...

So, where do you source this conveyor belt material, anyhow? wanders BTW - really nice build you got going on, here. You are making faster progress on it than I am on mine :|

I'm really impressed with the Yuneec e430 (see here). Targeted as a light sport plane, designed to sell for under $100K. Very impressive tech. wanders

Maybe. It certainly would make the motor operation quieter. I read an interesting white paper from PMD (who makes motor controller chips and other things). They have a technique called field-oriented control that looks interesting. PMD claim that it has all the advantages of sinusoidal control...

KF, you never cease to amaze! Thanks for the extensive FEMM tutorial. I had figured out most of this stuff (FEMM excels in neither step-by-step documentation nor user-interface niceties), but it is really useful to have this vast tutorial in a single place. BTW, if the copper depicted in your...

OK, I've been working on FEMM 4.2 models for a Halbach array, and I'm having very little luck. In particular, for N40 Neo material that is 1/4" thick, with an air gap of 1/4", with a left-right-up-down magnet sequence and square magnet cross-section, I'm not seeing the field magnitude that I...

Great find! The paper is probably in here, somewhere. wanders

Just saw this thread last night for the first time. I've been working on an axial-flux motor design for quite a while. AFAIK, the best book on the subject is by Jacek Gieras et al. Here's a link to an on-line lecture of his that really is useful...

Justin: Excellent historical perspective on multi-cell battery packs. Any chance you could post the presentation in PDF form? Wanders

Yup, isolated supplies are the key. I gave up (magic) smoking 20 years ago. :wink: The laptop supplies (which are dirt cheap in the surplus market) are isolated. Each is about 60W (typically 16V @ 4A) and these would match up well with the HK ECO6 50W charger ($19 plus S&H). Should be able to...

Hmmm, well I've rethought this statement. Now, there is no doubt that the work that Gary and Richard have done will yield a more optimal (e.g. faster charging and balancing) solution. But for off-the-shelf stuff sourced from Hobby King / Hong Kong, as well as the LVC boards from TTPacks.com, how...

I've been following Gary's design evolution (like the rest of us) with interest. It seems clear to me that, at least for the short term, LiPo packs developed for R/C application deliver the most "bang per buck" for e-bike use. The convenience factor in handling these packs also is important, as...

Typical for MAC (Shanghai) hub motor and so-called Infineon controller, swap yellow and green on the phase wires and on the sensor wires, leave blue connected to blue, and you should have success. I know, because I have the same setup. wanders....