LouMan's 94 Ford Aspire Electric Conversion

[LouMan]

thanks vpoppv I been asking cupple places but I think I'll try your way also

oh lordy Automcdonoughm I hope your not going to bid against my buddy he helped me get mine now I'm helpping him get his, oh well all's fare in love and war I guess, lmao

Jack B. your the igbt man how can I calculate my igbt speed with these specs,
part # MBN1200GS12AW 1200v, 1200amp
Vces (V) = 1200
Ic (A) = 1200
Vce(sat) = 2.9
Ton (ms)Max = 2.2
Toff (ms)Max = 1.6
tr(ms)Max = 0.55

I used to know how to caulate it but time cathing up with me I guess, lol
I don't know if the 16k coming from the controller is going to be to fast or will I need to turn it down, since I got version 1 control board from Paul when he very first released it,
it dosn't have the were I can hook up the pc to it to ajust settings.
I just got to get a upated atmega just haven't got to it yet, Grrrrrr
I'm thinking of giving the control board to my buddy for his project and building a new board with a updated atmega if I can swing Paul into giving me a deal, hehehehe

anyway thanks guy's for the help.
Louie................

[Automcdonough]

lol ok well let me know which auction it is and I promise not to bid-war your friend.

[jackbauer]

Your biggest problem with used slightly old igbts is switching speed. That one in your spec is horrendously slow. I run a pair of fuji 1mbi800-u4l parts bought on ebay from a guy in germany. They are pritty slow and old 3rd gen parts but have yet to fail. I run 8khz switching frequency. I would look for a 5th gen part if you can get your hands on one. There is a guy in massachusetts on ebay selling some good parts. I'll try to dig out the details ......

[LouMan]

is catapiller motor 10"
but I'm not going to tell anybody what they can't bid on,
just if you see that motor you'll who your bidding againts, lol

on a side note I got my ice ready to lift out of the car today and mesured from the face of the tranny to the frame and it's only 20 inches the 11in motor has 15.6in case, 1in collar, and a 3in shaft coming out both ends 23.5in total so I got to cut on the frame a little or save the motor for a little truck and find a smaller motor for the car, Grrrrrr lol

oh well, just one of them things lmao,

thank you jack, I already got the 1200amp igbt I don't mine setting it aside was just wondering how to calculate the speed when I do use it.

[jackbauer]

Powerex IGBT, 400A, 600V, CM400DU-12F Mod 4 Piece Lot - eBay (item 190305777785 end time Oct-28-10 00:30:03 PDT)

these are the guys you need. I'm building a new controller with 4 off. Beauty is that you short the high side gate emitter and it becomes the freewheel diode. I'm using a 15v dc dc converter on the control board in place of the 12v for extra turn on power. Regards calculating the switching times yeh you can do the math but why bother. At the end of the day you need the lowest toff and ton that you can find and afford. Your 1200amp module probably has a very high gate charge hence the slow switching.

[LouMan]

I got you on the shorting the high to make a freewheel diode I found 4 of these TOSHIBA MG200Q2YS40 modules last year for $30 total and couldn't turn them down and thought I could make a 800a power section also, so I got them laying around.

I also got one of these last week for $24 a Powerex CM600HA-24H so I got to figure out what to do with it.

I saved those powerex 400a igbt's on my ebay hopefully I'll be able to get them by Monday thanks

[jackbauer]

Those are both good modules for the vintage. That toshiba is widely used in forklift chargers being run at 20+ khz in a switching converter topology. I would still run at 8khz though as it makes life easier on the parts and reduces switching losses by 50% compared to 16khz.

[LouMan]

thanks Jack,
I got 4 of those toshiba's I can use them then?
I got to go thru your build thread to see how you got your controller down to 8khz,
that'll be great then
I'll have even less in my controller build, I was just trying to get ahold of my buddy to see if we can pool out money this weekend to get those 400amp powerex ones, that save money I don't have.
kool,

[jackbauer]

Yeh i think the toshibas would work well. i'm too tired right now to go looking up switching times but i did drive them quite hard in a charger design quite recently and they worked well. 700v dc bus and 100amps DO put a good snubber between B- and M- and poly caps in parallel with the elecs. To my surprise my caps ( 4 big 400v comp grade elecs) are showing no sign of distress. Another ebay guy in new york sells caps at good prices.

[LouMan]

Not much to report today,
got the gas tank,filler neck, and exhaust pipe out today, getting the center bolt out of the crank pulley was the hardest thing on this project so far but after a hour of tugging it finally broke loose, you have to take that pulley off on most front wheel drive cars to get the motor to slide over enough to come out of the tranny.
everythings off the car exept lifting the motor out, got to find a puller somewere, (maybe buy a 6 pack and invite a cupple buddys over, hahahaa

sorry jackbauer for picking your brains so late lastnight I forgot the time difference between us.

good modding everybody.