Endless Sphere

Awesome, looking forward to that info...!

Great vid eh!!

My favorite part was at about 3:50 in where the big guy crossing the street in front of you
thought that he had more time and started to scurry at the end...

np, RK I think that we would be extremely fortunate to get 100V to 200V, 200A out of a 6 FET/IGBT bridge with proper cooling. I am approaching this from a very simple perspective. It is extremely hard, IMHO, to try and fight this problem using a large number of small paralleled fets for a number of ...

RK, Yes, you could do what you proposed and probably come up with some results. There are several issues at play, One issue is the size of the die size of the fets. The bigger the die size generally, the bigger the capacitance on the gates. The bigger the capacitance, the longer it takes for the gat...

Camlight, If you are going to order a bunch of these fets, you can talk to IXYS direct. I looked at going direct and you only needed to put down ~$2000, which was definitely more parts than I needed. But if you have a project... Mindshare Technical Sales is an IXYS rep...they may be able to contact ...

Ratking, Sure, you just need to strip the fet drivers off an RC controller and drive the new fet bridge with appropriate FET drives. As easy as that sounds, it's a fair amount of work until we come up with logic level FET Bridge As an example, most of the BLDC development kits allow you to run senso...

Gotta love the DCB packages! Great find, I think that this part is going to be a winner and probably alot cheaper than the SOT227b. Solder a 1"x1" heat sink on each on and you'll be golden!! Being as the cooling tab is isolated, you can stick them all on the same sink even. :) :) :) I mak...

Gotta love the DCB packages! Great find, I think that this part is going to be a winner and
probably alot cheaper than the SOT227b. Solder a 1"x1" heat sink on each fet and you'll be golden!!

very cool Mauimart, If we can create a brain board with power supply out of the a devkit reference design that would be great! Good luck with your designs Rhitee05! That would be cool if we could come up with a controller interface standard between the board you come up with and the board that I com...

Thanks Microbatman, For 100V to 200V , 200A size controllers, the ISOBLOC package is hard to beat. If we make a modular system, with the fet drive mounted right on top of the package, in a 2 fet phase leg configuration, then they can stack 6, 12, 18 fets, and drive huge currents, 200A, 400A, 600A......

what a great program coln72!

THose kinds of events are priceless not just for your education, but for your life experience...

Good luck on the hybrid!

I need to send an email to e-crazyman, and see if he'll build the 6 fet with "no loads" on the gate drive section.
That way, we don't have to spend alot of time reworking boards, and just hook the microcontroller outputs
to the ADUM6132 fet drives.

Thanks for the link and the image Camlight.

Yes, yes, you bring up one of my dilemmas. I'm thinking that it may be a good idea to just do a phase leg board driver. There are a bunch of options, but the ADUM6132 seems like such a good fit...I have to check on the isolation...what kind of voltages can you run with this little guy? If we do a ph...

I found a great new shunt from Vishay that makes it easy to integrate with my bolt down design. Vishay High Current Shunt.jpg WSM5515 shunts are available in several sizes. L1600 = 0.00016 Ω L2000 = 0.00020 Ω L2500 = 0.00025 Ω L3000 = 0.00030 Ω L5000 = 0.00050 Ω http://www.vishay.com/...

Like others on this forum, I want an independent power board. The idea is to be able to drive the power board with small signals, like TTL, or maybe the existing gate drive on the XIECHANG. 6fet gate drive.JPG I've been chipping away at a PCB that has 14A peak gate drive chips (the 5 pin through hol...

I think it's called an eccentric cycloidal reduction

I used to use Frontline Serial spy to do similar captures...but you have to buy it.. I was just a matter of having two serial ports. We'd tap the TX and RX and send them both to the RX line on the RS232 ports on the PC. Realterm (freeware) may provide power enough data capture utilities to do this....

Matt, I'm looking forward to what you come up with here! Interesting ideas regarding the backdriving. I like the idea of using the input as the output in order to have a lower friction freewheel.... But wouldn't the friction be the same, as it's still spinning the same bearings? I guess the inertia ...

Katou, First I bored the clearance holes for the double bearing blocks. This was probably the original source of error. IFIRC, I drilled a pilot hole and tried to transfer it from one side to the other. I should have used a long piece of drill rod, and a machinists square to keep the pilot holes ali...

Looks great Matt!

Question, how are you going to keep the drive from spinning on the 2" tube? Does the mount
clamp tight enough?

I think I'm going to put a cross bar that ties into the seat frame.

thanks for the advice, I think that I will try a combination of things.

-Oval the hole slightly trying to retain enough clearance to the holes.
-Precision Drill rod
-rotate the housing 45 and drill/tapping new holes.

The left and right bearing blocks that support the jackshaft are off axis. This causes the jackshaft to bind. Would self alignment style bearings help fix it? That would probably require self-alignment bearings on both ends of the shaft. I need some help with ideas on how to fix it. :| I think I nee...

A Hybrid Synergy drive from a wrecked Prius perhaps. It would require significant repackaging.

check out IXYS again...

30A peak drivers IXDD430

They work in conjunction with IXBD4410 low side, IXBD4411 high side, and the dead time generator IXDP631.

I'm looking at using them right now.