Search found 464 matches

by 12p3phPMDC
Jul 11 2010 10:26pm
Forum: E-Bike Non-hub Motor Drives
Topic: Y-pedal's two stage RC drive..........
Replies: 692
Views: 64561

Re: Y-pedal's two stage RC drive..........

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...
by 12p3phPMDC
Jul 11 2010 7:55pm
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Re: SOT-227b Based 6 FET XIECHANG

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 ...
by 12p3phPMDC
Jul 11 2010 3:10pm
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Re: SOT-227b Based 6 FET XIECHANG

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...
by 12p3phPMDC
Jul 11 2010 8:09am
Forum: E-Bike Technical
Topic: Awesome new FET package :) :) :) Not a geek? you won't care
Replies: 75
Views: 6361

Re: Awesome new FET package :) :) :) Not a geek? you won't

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 ...
by 12p3phPMDC
Jul 11 2010 7:59am
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Re: SOT-227b Based 6 FET XIECHANG

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...
by 12p3phPMDC
Jul 10 2010 12:44pm
Forum: E-Bike Technical
Topic: Awesome new FET package :) :) :) Not a geek? you won't care
Replies: 75
Views: 6361

Re: Awesome new FET package :) :) :) Not a geek? you won't

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 makes me real...
by 12p3phPMDC
Jul 10 2010 9:30am
Forum: E-Bike Technical
Topic: Awesome new FET package :) :) :) Not a geek? you won't care
Replies: 75
Views: 6361

Re: Awesome new FET package :) :) :) Not a geek? you won't

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!!
by 12p3phPMDC
Jun 29 2010 12:51am
Forum: E-Bike Technical
Topic: Interest in a "Power Board" devkit for homebuilt controller?
Replies: 30
Views: 2361

Re: Interest in a "Power Board" devkit for homebuilt control

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...
by 12p3phPMDC
Jun 29 2010 12:25am
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Re: SOT-227b Based 6 FET XIECHANG

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......
by 12p3phPMDC
Jun 26 2010 8:36am
Forum: E-Bike Non-hub Motor Drives
Topic: electric/petrol hybrid revisited
Replies: 5
Views: 636

Re: electric/petrol hybrid revisited

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!
by 12p3phPMDC
Jun 25 2010 10:25am
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Re: SOT-227b Based 6 FET XIECHANG

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.
by 12p3phPMDC
Jun 25 2010 12:13am
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Re: SOT-227b Based 6 FET XIECHANG

Thanks for the link and the image Camlight.
lowInductance.JPG
lowInductance.JPG (77.15 KiB) Viewed 2681 times
by 12p3phPMDC
Jun 24 2010 6:24pm
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Re: SOT-227b Based 6 FET XIECHANG

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...
by 12p3phPMDC
Jun 24 2010 10:01am
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Big Shunt for Current Measurement

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/...
by 12p3phPMDC
Jun 24 2010 1:33am
Forum: E-Bike Technical
Topic: SOT-227b Based 6 FET XIECHANG
Replies: 34
Views: 4548

Re: SOT-227b Based 6 FET XIECHANG - HELP!

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...
by 12p3phPMDC
Jun 21 2010 9:06pm
Forum: E-Bike Non-hub Motor Drives
Topic: Its not a planetary............ so what is it?
Replies: 7
Views: 1116

Re: Its not a planetary............ so what is it?

I think it's called an eccentric cycloidal reduction
by 12p3phPMDC
Jun 21 2010 1:08pm
Forum: E-Bike Technical
Topic: Beta Testers Wanted On Updated Lyen Controller Program @370A
Replies: 68
Views: 7281

Re: Beta Testers Wanted On Updated Lyen Controller Program @

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....
by 12p3phPMDC
Jun 21 2010 12:48pm
Forum: E-Bike Non-hub Motor Drives
Topic: 3 speed hub as jackshaft. Questions?
Replies: 27
Views: 4850

Re: 3 speed hub as jackshaft. Questions?

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 ...
by 12p3phPMDC
Jun 21 2010 12:40pm
Forum: E-Bike Non-hub Motor Drives
Topic: Catrike Three Speed
Replies: 43
Views: 5399

Re: Catrike Three Speed

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...
by 12p3phPMDC
Jun 21 2010 12:08pm
Forum: E-Bike Non-hub Motor Drives
Topic: Catrike 700-E build
Replies: 87
Views: 10305

Re: Catrike 700-E build

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.
by 12p3phPMDC
Jun 20 2010 6:27pm
Forum: E-Bike Non-hub Motor Drives
Topic: Catrike Three Speed
Replies: 43
Views: 5399

Re: Catrike Three Speed

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.
by 12p3phPMDC
Jun 19 2010 1:19am
Forum: E-Bike Non-hub Motor Drives
Topic: Catrike Three Speed
Replies: 43
Views: 5399

Catrike Three Speed, Help!

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...
by 12p3phPMDC
May 17 2010 11:36am
Forum: Motor Technology
Topic: large brushless motor for car sized EVs?
Replies: 3
Views: 1052

Re: large brushless motor for car sized EVs?

A Hybrid Synergy drive from a wrecked Prius perhaps. It would require significant repackaging.
by 12p3phPMDC
May 05 2010 2:13pm
Forum: E-Bike Technical
Topic: Help with high-side "smart" fet driver solution.
Replies: 33
Views: 3571

Re: Help with high-side "smart" fet driver solution.

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.