Instructables

selfcontained electric car?

I had a few ideas on how to make more efficient cars. First off why is it we have NO generators being used while stuffs rotating. Take a small generator with a rubber drive point...like there a chain or belt would go... and place that on the tires. This is a friction driven generator which means that it would not work well in the rain. These...if done right... could keep the car running and then keep the battery charged. Using the battery only for stops.

I also think we need to figure out a way to put a coil in the drive train somewhere. Making it to where when the car stops the coil is wound tight, when the car takes off again the coil could unwind and help the car take off. this feature added to gasoline engines would help cut the cost of gas greatly, not to mention emissions.

GASSYPOOTS2 years ago
thats where you could use a compressed air car that has a air compresser and a turbine on the axle. air blowss turbine= axle turns
NativeSs (author) 3 years ago
either way i had a fun debate... i dont know if it would work or not i just enjoy having people make me think... thank you for participating
Kiteman3 years ago
The car already has a generator built into the system, which is already charging the battery. Adding another will only waste the car's power.

As for the spring-coil, there are more efficient mechanical energy stores, such as compressed gases or flywheels.

NativeSs (author)  Kiteman3 years ago
you are talking about the simple alternator, yes that charges the battery... but for an electric car wouldnt it stand to reason than 4 generators could run the car? when you are driving it you still have to stop to recharge, if it was constantly charging.... or charges after the batters hits below a certain %, then no more pit stops to recharge. grab you a cooler and a piss bottle and cut your trip time down by a whole lot
Four generators might run the car, but what runs the generators?

You're talking about perpetual motion - using the battery to drive a motor, use the motor to drive a generator, use the generator to charge the battery...

The *only* time that cycle is of any use in an all-electric car is during braking. In traditional friction braking, the energy of motion is transformed into heat. Using regenerative braking, the energy is transformed back into electricity to charge the battery. However, this process is not, and cannot be, 100% efficient.

NativeSs (author)  Kiteman3 years ago
What runs the generators is the wheens. It wouldnt be set up just to charge the battery. if the wheels have to turn to move the car, and the car uses energy, the grnerators produce energy. maybe not 100% efficient, but alot more so than having to stop and recharge. and a big enough generator would make it 100% minus the initial start up. We got generators powering the world... so the right one could produce the right amount... not to charge the battery but to RUN the motor.
You're not paying attention - charging the car's batteries from the car's movement will not extend the car's range.

In fact, the waste of energy at each transformation will reduce the car's range.

"There ain't no such thing as a free lunch."
NativeSs (author)  Kiteman3 years ago
no youre not paying attention... im not talking about using a generator to charge the cars batteries... using the generator to run the car... the battery would only be in use for speeds under like 20mph, anything over that the generators run the car. You spin the wheels to drive with a generator using friction they generate electricity to keep the car running... a big enough generator would keep the car running, since an alternator is just barely bigger than a fist, so 4 that size should run the motor.
But, still, the only source of energy for these generators is the car itself.

This is nothing to do with the size of the generator, but more to do with the fact that you are, if you follow the route of the energy through, using the car to run the car.

NativeSs (author)  Kiteman3 years ago
all you have to do is have generators capable of putting out more electricity than the car needs... and not each generator would need to, just have the combined generator output be more than the cars minimum for running... and with the excess output you can charge the batters for the stop and go times.
But the generators *cannot* put out more energy than they are given, and the only energy you are giving them is the energy of the already-moving car. If they put out more energy than the car supplies, then they are creating energy from nowhere.

IT

WILL

NOT

WORK.

(Although, you are free to prove me wrong by either building a self-powered car yourself, or providing a link to any other example of functioning perpetual motion.)

Go and do some reading, preferably of an actual book, and learn about the Second Law of Thermodynamics.
NativeSs (author)  Kiteman3 years ago
I guess we're throwing gear ratios to the wayside. it's not creating energy any more than a hand crank generator is. But you have a 16" rim, with about 2" side wall, so about 20" diameter... still following... if the generators wheel has a 10" diameter then the generator will be making 2 revolutions to the tires 1. That has got to do something.
NativeSs (author)  NativeSs3 years ago
I also think you are forgetting about quantity... Each generator is going to be putting out the same amount of energy, which as you say will be slightly less than the motor is putting out... which two generators should be putting out almost twice as much needed
You don't understand what you are talking about - stop the conversation, it is futile.

L
(Suppresses deep sigh)

This is *nothing* to do with gear ratios, *nothing* to do with the number of generators.

It is *everything* to do with the source of the energy that runs the generators.

I repeat: go and learn about the Second Law of Thermodynamics.