Generators for Electric Cars

you take power from the battery to drive the car and want to charge it with the same source.

This will only end up with less driving power and if dimensioned evenly, in a stand still and discharged battery (empty)

If you mean, only when energy is available like down the hill, your motor can generate that power too.

It saves you all the trouble.

There is nothing with more than 100% efficiency.

It can be done!! Use bigger wheels at the back and the car will run down hill all the time.

The real answer is no unless you are capable of lifting yourselves by the shoe laces.

I suggest the use of a Cramden Surface mapped route. With such a mapped route, there exists between any two points and uphill and a downhill route.

Thus, you can roll down hill to work and roll back home the other way. If you have a 2 ton removable battery, you can charge one on the way to work and sell the power to the boss and run yestardays battery home at days end to charge it so you can sell power at home to the grid.

One wonders why more people do not do this. I think the second law police shoot to kill

The battery is a storage device to provide the energy(electrical) for the motor to create a force to do work(get you from point A to Point B). Any generator placed on the vehicle to recharge the battery needs to have some force applied to it to create electrical energy. If the motor is to provide this force it needs to do more work. So it will consume more energy from the battery. The best the added generator will do if 100% efficient will return the energy the motor consumed to do the extra work back to the battery. Nothing is 100% efficient so the energy in the battery will be depleted faster.

Actually, some electric golf carts use a "motor break" when going down hill- the drive motor works as a generator when the cart is going down hill. Of course, one never gets back as much energy as was used to get to the top of the hill in the first place, but it does seem to add maybe 1-2% life to the battery charge...

Yes, it's possible that a finish carpenter can daydream.

What you are looking for is not only possible, but it's also impractical.

...would a two bladed hand saw cut twice as much with the same amount of effort?

..in short.. you can't harvest energy from your drive momentum, or the wind in your cowling's without putting a drag on your racer.

.. don't give up.. we have all thought this about it for a second or two.

...I've seen entire articles that push this brand of physics..

... eg.. roadside windmills.. HA!

How about a comutator circuit to use the counter EMF in the motor windings to extend battery life?

Sometime back İ read where a startup proposed to place a wind turbine on a car to capture the power in the wind flowing by. Same as this - you would be net energy negative - not a good deal!

One answer is to use a flumadalmigator valve in the system - that allows one to blow smoke up their own backside. The gain from any KERS system is small and it is expensive.

One can always walk after grinding to a halt.

There is no way U can achieve that, the discharge rate of the battery will increase for any added load. by including a generator or charging alternator to ur electric car, the retarding effect caused by the interaction of the magnetic fields in the generator will add to the existing retarding force. The power demand from the battery to over come this forces will increase causing it to have a higher discharging rate.

In combustion engines the charging alternator is also taking its fare share of the of the engine capacity.

DICKSON.

Join the Harry Potter fan club, they can help with some free magic!

The electric motors that drive the front wheels can become generators when you want to slow down (brake). This is called regenerative braking and it "may" be able to extend drive time up to 15% for stop-and-go city driving. Regenerative braking does nothing significant during highway driving as most of the energy is used to overcome air drag and that energy cannot be recovered.

Regenerative braking can add complexity, weight, and cost to an electric vehicle. It is a complex problem to determine when it becomes a viable option.

Electrical converters to step down the main battery bank voltage (120-300 VDC) to the 12 VDC needed to run accessories can be easily made 95%+ efficient. Any other method to steal accessory power from car motion will be less efficient.

15% extension? İ will believe that when İ see it. Maybe calculated but never in real life unless one is driving like a maniac. The system is also called KERS we have seen that in Formula1.

Just for clarification,I was talking about a generator on the rear

axel,not on the powered wheels. Hey-how about kind of a very lightweight

5th wheel that could be lowered from undercarriage to highway?

Rolf,

it is fully obvious that you have NOT understood any of the posts here. Or not read them....I cannot say which of the above you did not do, the effects are the same!!

It is also obvious that you are not an engineer of ANY discipline known.

It is also obvious that you are (sadly) not very intelligent as you have failed to understand the helpful posts already made by many.

May I make a good helpful suggestion to you:-

GIVE UP!!!Stop posting, simply disappear, change your name, you are a laughing stock of CR4, selfmade....

What you want to do is against all known laws of physics. The losses involved alone preclude your ideas from working.......

Its also against all known laws of simple intelligence.....

As you have not followed any of the logic already given to you by well meaning and friendly CR4 posters, I thought that I would assist you by telling you exactly where you are totally screwed up in your thinking....did you NOW understand the problem(s)?

I could not let this blog go any further.......a chimp would have understood it better and quicker!!

Hi Rolf,

I compare your proposition as you running around with a bucket full of water that has a hole in it.

But you have a little scoop to catch the water you are losing, and catch you and put it always back in the bucket.

Whatever how many times you scoop or what form of scoop you will use.

There will never be more water in your bucket than the quantity you started with.

The water that you couldn't put in your bucket are losses, due to imperfections. This is always a lose, lose situation.

Just forget it

The analogy is perfect!!!

Rolf. The car spends energy to move, and once it is moving at a constant speed it will use a constant amount of energy on the level, no wind etc.

If you run a wheel on the road to make 1 horsepower or 1/1000 of a horsepower, your car will slow down proportionately, unless you increase the gas consumption to compensate for the power drain from your wheel. So there is nothing free.

To take it to an extreme, if you had 100 horsepower driving the car and you put down a road wheel to make 100 HP, your car would stop quickly.

http://en.wikipedia.org/wiki/There_ain%27t_no_such_thing_as_a_free_lunch

GA for you rolf! great irony i your name too!

...Honestly though.. you remind me of an old friend of mine who repeatedly brought up his "new idea" of creating free propulsion using the repelling force of magnets!

...I would briefly try to explain that he was trying to build a perpetual motion machine, and he responded by investing about five bucks in cabinet magnets to prove his theory!

While i would stare on in beguiled amusement.. he would flop his magnets around on a piece of 2X4 and ... well it didn't work a bit..

If I tried to tell me.. "I told you so" .. his response was along the lines of..

"I" Know it will work!.. You just don't understand what I'm trying to do!.. I know that if i get the timing just right.. and use some better magnets.. It WILL work!"

...I haven't heard his novel idea in awhile.. so either he's gotten wise, or he's still working on it without my input.

_________________________

while i half agree with the timid guest who is trying to throw you under the bus.. I also understand that enthusiasm and the fact that dreams can be a little blinding.. No worries...

You have CR4 at your fingertips..

It puts your new epiphany within easy reach

__________________________

If my first response was "ha ha ha ha ha!" ...maybe I would have received a GA

Those are doled out like badges.. ..and I don't need to show you no stinkin' badges!

No insult intended, but it really doesn't matter what method you propose. All of these bootstrap free power ideas are fundamentally flawed. The sooner you understand that they don't work, the sooner you can get back to daydreaming about something that might actually work. DON'T stop daydreaming. It is one good way to generate new ideas. I'm merely suggesting that you don't waste the effort on junk science gadgets.

In a word: NO

Cheers,

Stu