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  #21  
Old 11-28-2010, 10:39 PM
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Default Re: Smart Fortwo EV..... High power version!!

I got the cells!

Total of 338 cells buy direct from Headway. It's like they have a new style of positive terminal!
I tested around 10% of the cells and all are between 3 and 3.5 mΩ.

The price is around 17$ each including shipping and taxes.

I need to add 46 cells from my motorcycle pack to complete my 48s 8p pack.

So 1000A / 8 = 125A
125A x 0.0035 mΩ = 0.4375
3.2 - 0.4375 = 2.76 v

And (2.76 x 48) x 1000 = 132.48 KW peak...... not bad in a Smart Fortwo!










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  #22  
Old 11-29-2010, 02:07 AM
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Default Re: Smart Fortwo EV..... High power version!!

Be very careful of those JC23 coded cells. They have no rupture disc. See my thread :

http://www.diyelectriccar.com/forums...ell-51847.html
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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 1000 Amps, that's bad.
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  #23  
Old 12-02-2010, 07:26 AM
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Default Re: Smart Fortwo EV..... High power version!!

Hi
My 38120S 10Ah are coded JI03 and JI04. The first box contain a warning paper about too long screw they push on rupture disc.


And after many weeks of search and design about limited slip drive train I finaly concluded that will be realy complex and costly to build a custom direct drive lsd drive train. It's easy in a motorcycle or a go-kart, but it's another way in a car.
So now, the best way I find is use a Sentra SE-R Spec-V transmission. They come stock with a helical lsd (Torsen) and have 6 speeds.
I think use the 4e and 5e gears to have a 4.378 and 3.345 ratio. I can get one at scrap yard for 300$.
After some calculs, that give me the same 0-60 mph time than direct drive set-up cause by the 0.5s shifting delay. So a faster 0-45 mph, same 0-60 mph and a faster 0-75 mph and 1/4 miles.

I'm a bit disapointed to don't go direct drive, but I know it will be probably a bit more efficient and a lot less complex. So it's not bad.... I think!
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  #24  
Old 12-06-2010, 08:10 PM
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Default Re: Smart Fortwo EV..... High power version!!

The small 800cc CDI diesel motor is out of the frame. It haven't a lot of place for a big 11" motor and a Nissan transmission.....
The ICE is put at 45° in the rear of the Smart and pass over the drive shafts. So, replace it for a big 11" cylinder will be not easy!!




















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  #25  
Old 12-06-2010, 09:53 PM
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Default Re: Smart Fortwo EV..... High power version!!

Quote:
So, replace it for a big 11" cylinder will be not easy!!
I'll say. This will be interesting to watch! How are you going to keep the front end on the ground when you floor it?
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  #26  
Old 12-08-2010, 04:36 PM
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Default Re: Smart Fortwo EV..... High power version!!

Quote:
Originally Posted by tomofreno View Post
I'll say. This will be interesting to watch! How are you going to keep the front end on the ground when you floor it?
I will don't have race tire on, so no problem.... the car will be a doughnut machine.
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  #27  
Old 12-13-2010, 07:02 AM
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Default Re: Smart Fortwo EV..... High power version!!

Hi

What do you think about this insulating varnish to insulate a bit more an old GE forklift motor?
It is pretty cheap at less than 10$ for an Aerorols. 2900 volts per 0.001".


PERFORMANCE

TEMPERATURE CLASS:
Class F (155°C / 310°F)
DRY HEAT RESISTANCE:
Constant: 310°F
Intermittently: 400°F
DILECTRIC STRENGTH:
(ASTM D 115-07)
Red: 2,600 VPM
Green: 2,890 VPM
Clear: 2,300 VPM


ONE WEEK HARDNESS:

(ASTM D 3363 SHORE A 24hr / 1 Week): 6B

FLEXIBILITY:
(ASTM D 522) Pass
CHEMICAL RESISTANCE:
Aliphatic hydrocarbon solvents: Moderate
Alkalis: Severe
Aromatic hydrocarbon solvents: Severe
Chlorinated solvents: Moderate
Salt water: Severe
Glycol ethers, alcohols: Severe
Inorganic acids: Severe
Organic acids: Severe

Oils: Severe


DRYING SCHEDULE

DRYING TIME AEROSOL @ 70°F @ 50% R.H.:
To Touch: 1 Minunte
To handle: 5 Minutes (Tack Free)
Full cure: 7 Days

DRYING TIME BULK @ 70°F @ 50% R.H. 1mil wft:
To Touch: 10 Minutes
To handle: 1 Hour (Tack Free)
Full cure: 7 Days

Curing can be accelerated by baking for 1 hr @ 300 degrees F
RECOAT: Anytime


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  #28  
Old 12-21-2010, 10:29 AM
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Default Re: Smart Fortwo EV..... High power version!!

Quote:
Originally Posted by Duncan View Post
I have been thinking about the reverse gear issue - for a lightweight 2 seater

(1) -No reverse just push it back
(2) - Use the reversing contactor I got from an old forklift - should never be actuated under load
(3) - use two double Alderson connectors to reverse the field coils
unplug the green ones plug in the red ones!
(4) - Lotus 7 type cars with motorbike engines use a starter motor to drive the car backwards
I have another idea to put on the table about reversing motor rotation in a direct drive application.....

What do you think about add another small controller to the motor?
I have a 156v 1000A controller to go forward and I think about a cheap (100$) 12v 200A controller to go in reverse!

This configuration have the the important advantage than no power is lost in the reversing contactor. Why lose 100% of the time 0.5% of your power in the contactor (even more in stop and go in the city traffic when motor often see 1000A) when you only need this contactor to go in reverse 0.5% of time during a ride?

I only need a good auxiliary battery coupled with the DC-DC. 200A is less than an engine starter need during some sec.
Or, if that exist, I need a small 156v 200A controller!
In fact, I'm not persuaded I need 200A to go in reverse at 5 mph during 5-10 sec.

What do you think about this solution to go in reverse?
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  #29  
Old 12-21-2010, 11:06 AM
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Default Re: Smart Fortwo EV..... High power version!!

Sounds like a good alternative to me, in fact I might just do the same myself. It means a small weight penalty, and a little more complexity, but like you say it eliminates voltage drop across the reversing contactors. With a car that is as short as your Smart (and my Mini) it's not as if we'll need to reverse very often You might want to avoid parking facing down a steep hill though, just in case someone parks right in front of you...

Were you thinking of using the same throttle potentiometer for both controllers?
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  #30  
Old 12-21-2010, 11:18 AM
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Default Re: Smart Fortwo EV..... High power version!!

Quote:
Originally Posted by Yabert View Post
I have another idea to put on the table about reversing motor rotation in a direct drive application.....

What do you think about add another small controller to the motor? .....
What do you think about this solution to go in reverse?
Hi Yab,

I don't see it How do you connect a second controller to a series motor and get reverse? You still have to reverse the field respective to the armature. And once you do that, just use you main controller.

Regards,

major
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