I'm new to the Electric car thing. But not new to cars having built & repaired cars from the ground up.
I have been looking at motors. The largest I've seen is a 108 HP continuous duty. I have seen two of these rigged up to run together.
Guy said he broke his motor mounts - Duh - he mounted them to 3/8" aluminum plate. Aluminum has no modulus of elasticity. Once it's bent you gotta leave it bent or else it cracks. It doesn't take flexing well either.
Any ever heard of a computer driving 4 motors - one on each wheel? Maybe steppers?
One of the things I'm having a hard time wrapping my head around is how a 50 HP motor can keep a car going under load.
I've seen the race car videos but they tell you nothing about what motors the cars are running on, how long they can run etc.
Heat and AC are other issues I'm struggling with. Electric is a lousy way to generate heat 'cause it consumes tons of power to get any BTU. What do E cars use Piezo ceramic heaters? I suppose AC would require it's own motor.
The necessary motors:
Brakes & Power steering, AC, and Drive - am I missing any?
What HP do you need for Brakes and Power Steering? What about AC? I'm guessing about 5 HP might do it all Run the Brakes and steering all the time and have the AC run exactly like it always does and let the electric clutch on the AC pump tell the pulley to engage or disengage. and run it all off a single serpentine.
Why are some cars AC and others DC? Is there an advantage one over the other? Seems like AC would be more work, so there must be some pay back.
As far as traction control goes has any conversion kit come online that'll let you run your Audi or other all wheel drive car on an E-conversion?
I have been looking at motors. The largest I've seen is a 108 HP continuous duty. I have seen two of these rigged up to run together.
Guy said he broke his motor mounts - Duh - he mounted them to 3/8" aluminum plate. Aluminum has no modulus of elasticity. Once it's bent you gotta leave it bent or else it cracks. It doesn't take flexing well either.
Any ever heard of a computer driving 4 motors - one on each wheel? Maybe steppers?
One of the things I'm having a hard time wrapping my head around is how a 50 HP motor can keep a car going under load.
I've seen the race car videos but they tell you nothing about what motors the cars are running on, how long they can run etc.
Heat and AC are other issues I'm struggling with. Electric is a lousy way to generate heat 'cause it consumes tons of power to get any BTU. What do E cars use Piezo ceramic heaters? I suppose AC would require it's own motor.
The necessary motors:
Brakes & Power steering, AC, and Drive - am I missing any?
What HP do you need for Brakes and Power Steering? What about AC? I'm guessing about 5 HP might do it all Run the Brakes and steering all the time and have the AC run exactly like it always does and let the electric clutch on the AC pump tell the pulley to engage or disengage. and run it all off a single serpentine.
Why are some cars AC and others DC? Is there an advantage one over the other? Seems like AC would be more work, so there must be some pay back.
As far as traction control goes has any conversion kit come online that'll let you run your Audi or other all wheel drive car on an E-conversion?
posted by:
|
-
Re: Motors and components
Wed, March 5, 2008 - 11:16 PMAny other questions ? ;>
it seems you've asked most of them except about batteries.....
108 HP cont.... is that the Kustov?
It is hard to compare ICE HP to electric HP....
one thing is you look at the torque curve....
And once you are going down the road feeling fine.....
it's about 20 to 30 HP needed to maintain speed..
There are many racers that have 2 motors synced up:
both mechanically and electrically...
Some are even silly enuf to attempt 3 motors!
Are you on the EVlist?
how about the racing list/?
have you checked out NEdRA?
And yes, there are many true 4WD cars out there.
A few of them are on the moon and Mars.....
-
-
Re: Motors and components
Thu, March 6, 2008 - 7:41 AM*********Any other questions ? ;> ********
lol. Well I’m just taking my first gander at EVs.
**********it seems you've asked most of them except about batteries.....*******
Well as an amateur I’d be looking at marine deep cycle lead acid batteries. Anyway Lithium has a poor life expectancy & loses power with each cycle & costs a lot more.
“Electric Cars are for girls” has a page with battery weight = mileage ratio but, no mention is made of power consumption such as engine size, loads hauled, or terrain. I’d think those variables would factor rather significantly into what kind of mileage one might expect.
*********108 HP cont.... is that the Kustov? **********
Might have been.
*********It is hard to compare ICE HP to electric HP....
one thing is you look at the torque curve**********
And inertia.
********And once you are going down the road feeling fine.....
it's about 20 to 30 HP needed to maintain speed..*********
Really~!! How very interesting.
**********There are many racers that have 2 motors synced up:
both mechanically and electrically...********
Ahh so they burn all the power up in a shorter period not obtaining any endurance ‘cause hey~!! it’s a race~!!
********Some are even silly enuf to attempt 3 motors! **********
Hey mom lookit me.
***********Are you on the EVlist?*********
I just joined the” “EV FORUM - ELECTRIC VEHICLE FORUM”
Didn’t know about the EVlist - yet.
**********how about the racing list/? *********
Nope.
**********have you checked out NEdRA? ********
Not yet. Will.
**********And yes, there are many true 4WD cars out there.
A few of them are on the moon and Mars. *********
Don’t be mean. Making me crane my neck to see ‘em ~!!
It’s a serious question though. The computer in the audi tells the engine that it can’t have more fuel than needed to push all the wheels while it’s controlling the individual wheels. Were I to build an EV I’d like to look into traction control if it could be had in some kind of package you can purchase. Do you know of any mods to the computer in a car? I'd guess it'd take some technology to get it done.
Freight train engines are diesel electric. And they have traction controlled all wheel drive. Each wheel has a huge electric motor. They are all designed to run off a computer that manages the traction. I don’t know if they regenerate power but I’d bet they do.
You can buy ‘em rebuilt
www.emdiesels.com/lms/pdf_f...fmg_tm.pdf
Woo Hoo~!! -
-
Re: Motors and components
Thu, March 6, 2008 - 10:10 AM"Well as an amateur I’d be looking at marine deep cycle lead acid batteries. Anyway Lithium has a poor life expectancy & loses power with each cycle & costs a lot more."
the LeFePo (lithium ferrite polymer) batterys have a 2000 cycle life, and they don't need to be maintained like lead, lead is approximately 4 times heavier with 1/4 the energy storage as lithium. Lead is cheaper and it will get you going ,but when all that nasty battery acid ruins the nice custom battery trays and holders, you will wish you had lithium!
here gorge on some links:
www.internationalbatteryinc.com/
www.worldclassexotics.com/Elect...nv.htm
www.electroauto.com
www.metricmind.com
I specialize is in custom motorcycles using AC drives, big fat 100hp dc motors and the new lithium batterys, One of my clients is getting 100mile range at 100 mph top speed on his lithium AC motorcycle. -
-
Re: Motors and components
Thu, March 6, 2008 - 10:17 AMvehicles that use the new safe lithiums:
www.evalbum.com/battt/LIPO
-
Re: Motors and components
Fri, March 7, 2008 - 12:05 PM************custom motorcycles using AC drives, big fat 100hp dc motors and the new lithium batterys, One of my clients is getting 100mile range at 100 mph top speed on his lithium AC motorcycle.***********
That's pretty damn impressive.
Thanks for the links
I had read that they have a 3 year life and lose like 20% each cycle. Is that old information or just wrong? -
-
Re: Motors and components
Fri, March 7, 2008 - 3:15 PMdefinitely wrong! We love the lithium! -
-
Re: Motors and components
Fri, March 7, 2008 - 4:56 PMOh wow. Sometimes being wrong is good.
-
-
-
-
-
