[kishor5466]

Originally Posted by ruckus

Ok, I am thinking he needs a place to start. Most people start here:

www.evalbum.com

You can see lots of examples and can search by battery brand, type, controller, etc. When you find cars that are similar in performance to what you want, take note of the components used, research their cost and capabilities.

Then you will know a little something.

There are many paths to what you seek. Do you merely want to meet the target? Or do you want to build something cool? You mention 72v pack. I think you must have forgot a zero and meant 720v, yes?

In America we call this humor..

Thanks a lot.........!!!!

[kishor5466]

Hey,
Can anyone who have researched on how best the speed coupling or the torque coupling suits a parallel hybrid race car , tell me the details????

[kishor5466]

hey,
is IC engine sensitive to speed or torque ?? (In terms of operating efficiency??)

[kishor5466]

hey,
can any one brief me about how the powers of engine and the motor add up in a hybrid car???

[Ziggythewiz]

It's pretty simple on paper:

ICE + small Electric motor + main Electric motor - some frictional losses = power out

They also have clutches in between everything so mechanically it's obscenely complex but can produce up to 6 different driving configurations.

[kishor5466]

Originally Posted by Ziggythewiz

It's pretty simple on paper:

ICE + small Electric motor + main Electric motor - some frictional losses = power output

So what ever may be the speed , torque will match and the power output will be same ........ Hence in a race car does it really matter if we choose speed coupling or Torque coupling???

[/QUOTE]They also have clutches in between everything so mechanically it's obscenely complex but can produce up to 6 different driving configurations.[/QUOTE]

Okay here are you referring to planetary gear system?? If not with what kind of other system will we be able to get those many configurations???

[Ziggythewiz]

A planetary gear system mixes the inputs, a clutch turns them on or off. With each motor separately clutched you can create any combination you want to maximize power or efficiency.

I don't know anything about speed or torque couplings.

[Coulomb]

Originally Posted by Ziggythewiz

It's pretty simple on paper:

ICE + small Electric motor + main Electric motor - some frictional losses = power out

Yes, but often you can't get the peak power of the ICE and motor at the same time, so the total peak power may not be the sum of the ICE and motor peak powers (before subtracting transmission losses).

For example, Prius NHW20: ICE 57 kW, motor 50 kW, combined 82 kW. The combined power is a long way short of the 105 kW you'd get by just adding the ICE and motor peak power. The limitations are part of the design, so there is no simple formula for figuring out the combined power, at least in general.

[ Edit: source: http://en.wikibooks.org/wiki/Toyota_Prius#Versions ]

[Coulomb]

Actually, the main limitation in the Prius is the DC/DC converter. When the battery assists the ICE to produce power, it goes through a 201 V to ~ 500 V converter, which has a 20-25 kW limit. If you take it as 25 kW, then 57 kW ICE + 25 kW battery power = 82 kW input to the "transmission".

[ Edit: some of the ICE power is routed through the two motors, so their power isn't wasted; one or other may be maxed out depending on the vehicle and ICE speed and power. However, this path isn't through the DC/DC "bottleneck", so the 25 kW limit doesn't apply to that. ]

[kishor5466]

hey guys,
if we are using a dc motor (say yasa 750) and we are having a controller which is compatible with the motor then will it be necessary to have choppers in between???(say battery voltage is 300V).......
or does the motor controller will itself do the work of chopping off the voltage and current???