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Electric Motorcycle That Also Generates Electric Power

Question asked by NARENDRA307 in #Coffee Room on Dec 23, 2014
NARENDRA307
NARENDRA307 · Dec 23, 2014
Rank E1 - BEGINNER
I am Narendra.I am persuing Engineering.Now i'm in final year,in this we need to do a project. My interest is to design a electric bike.Electric bike is common but my strategy is to design the bike to produce electricity.That means while the bike is running electricity is produced and it will be reused for its running...................
Any one wants to discuss with me on this reply me
and also contact me at <snipped> Posted in: #Coffee Room
Kaustubh Katdare
Kaustubh Katdare · Dec 23, 2014
Rank A1 - PRO
1. If you are trying to make an perpetual motion machine, I wish you all the best!

2. You could make a regular electric motorcycle and then add a dynamo system to generate some electricity.

PS: I'm updating the title of this discussion.
NARENDRA307
NARENDRA307 · Dec 23, 2014
Rank E1 - BEGINNER
Up to my knowledge i would like to made a new rear wheel system with it self as a dynamo.
In brief rear wheel works as a dynamo it self
Shashank Moghe
Shashank Moghe · Jan 8, 2015
Rank B2 - LEADER
Wouldn't the dynamo produce more power if the rotor had a small diameter (greater rpm)? Why keep the wheel (which has a big diameter) as a dynamo when you can have dynamos with rotors of very small diameters (in comparison to the rear wheel)?
Ramani Aswath
Ramani Aswath · Jan 9, 2015
Rank A1 - PRO
Kaustubh Katdare
1. If you are trying to make an perpetual motion machine, I wish you all the best!
He is. Not on.
The project would be a royal waste of time and effort if electricity production for running the machine is the intent.
@NARENDRA307, you must realize that you are attempting to make a PPM of the second kind, which violates the second law of thermodynamics. It is analogous to generate electricity from a hydel generator below a dam, running a pump with the electricity to pump the water back into the dam and use the electricity for other things as well.

Sorry friend, no free lunch in physics.
Shashank Moghe
Shashank Moghe · Jan 9, 2015
Rank B2 - LEADER
Well I don't think it is his idea to make a PMM, he is a final year Engg student, he knows better (fingers crossed). What he is talking about is energy recovery, like the KERS technology used in cars. But he has to appreciate that since this is an electric bike, the additional resistance provided by the contact of the dynamo rotor on the bike tyre will demand more from the main driving battery for the same speed and load, and as such whatever he plans to generate from the dynamo will have its upper limit set at that additional toll on the main driving battery (assuming the dynamo efficiency is 100%, which we know is not the case, hence, a loss is inevitable).

What will make more sense, is a system like KERS, which uses the Kinetic Energy of the vehicle when braking and converts that to electric charge.
Ramani Aswath
Ramani Aswath · Jan 9, 2015
Rank A1 - PRO
Shashank Moghe
What he is talking about is energy recovery
I do not think so. He does say that it will produce electricity while running, which will be reused for running. Regenerative braking is a known technology to save power otherwise wasted as heat in brake lining.
Shashank Moghe
Shashank Moghe · Jan 9, 2015
Rank B2 - LEADER
Well I think he is not wrong in saying that electricity will be produced using his dynamo (if separately installed), he is right there, it will indeed be produced. He can use it to run the bike as well. What he is probably yet to appreciate, is that the total energy (spent to run the bike with the dynamo installed - dynamo recovered) will still be more than what would be spent if the dynamo wasn't installed at all.

"
Up to my knowledge i would like to made a new rear wheel system with it self as a dynamo.
In brief rear wheel works as a dynamo it self"

This might be a hint that he wants to stay away from a separately installed dynamo (knowing the no-win argument), and use the frictional losses in the rear wheel system to generate electricity.

I am really, really hoping he is not out to make a PMM2.
Ramani Aswath
Ramani Aswath · Jan 9, 2015
Rank A1 - PRO
Shashank Moghe
he is right there, it will indeed be produced
Let us remove the battery. For argument's sake let us even say that the bike is got to move at some specified speed. Let the dynamo cut in. It produces power but immediately applies a torque that slows the bike. The output decreases steadily as the bike comes to a stop.
Some dynamo hubs are available.
https://www.dutchbikebits.com/index.php?route=product/product&product_id=247
Koushal Patel
Koushal Patel · Jan 9, 2015
Rank C1 - EXPERT
A.V.Ramani
The output decreases steadily as the bike comes to a stop.
For this, I guess, We need some second source of energy to let the vehicle run! I am not sure.
Shashank Moghe
Shashank Moghe · Jan 9, 2015
Rank B2 - LEADER
A.V.Ramani
Let us remove the battery. For argument's sake let us even say that the bike is got to move at some specified speed. Let the dynamo cut in. It produces power but immediately applies a torque that slows the bike. The output decreases steadily as the bike comes to a stop.
Some dynamo hubs are available.
https://www.dutchbikebits.com/index.php?route=product/product&product_id=247

Well, I am of the same opinion as I explained in the rest of my earlier post, the torque that converts to the wheel rpm would be reduced because of the dynamo. That is not what I was discussing. I am saying the boy wanted to say he has devised a mechanism which recovers energy from the friction due to transmission, but unnecessarily used the word dynamo, which gives us the impression that he intends to build a PMM2.
NARENDRA307
NARENDRA307 · Jan 9, 2015
Rank E1 - BEGINNER
Your absolutely right we need a secondary source.We know that electircity is not produced 100% as which is used to run it . To overcome this a secondary source is required.Here I want to use solar energy as a secondary one which is fixed on the stefiny
Gurwinder Singh
Gurwinder Singh · Jan 9, 2015
Rank C3 - EXPERT
Produce electricity from a electric bike is so difficult. You can use solar power to do the same even if it is on the way.
Ramani Aswath
Ramani Aswath · Jan 10, 2015
Rank A1 - PRO
It appears that each one of us is discussing a different issue. Let the OP set up a design brief giving various assumptions that he is using. The first post said,'but my strategy is to design the bike to produce electricity.' It continues: ' while the bike is running electricity is produced and it will be reused for its running.................... ' An electric bike that produces electricity, which is used to run it is a PMM.
Be that as it may, I am passing on this for the present till a greater clarity is brought to the project.
NARENDRA307
NARENDRA307 · Jan 16, 2015
Rank E1 - BEGINNER
If you don't mind please give me brief explanation about pmm because I don't know what is a pmm.
Koushal Patel
Koushal Patel · Jan 16, 2015
Rank C1 - EXPERT
NARENDRA307
If you don't mind please give me brief explanation about pmm because I don't know what is a pmm.
https://en.wikipedia.org/wiki/Perpetual_motion

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