You got the formula right, but you are using it wrong. 3000RPM / 90V = 33.3RPM/V, and it is not the same thing as 33.3V/RPM.

Ahhh, I got it now! Thank you

 

Anyone who has ever peddled a bicycle or turned a hand crank to generate power knows just how difficult it can be. As the load increases the leg and arm muscles really begin to feel it.

Ron

What’s not mentioned in my post is I have an approximately 120lbs, 29” diameter flywheel. So the participants only have to get that moving at a reasonable speed and the momentum will make easier to keep it turning....some gearing is required.

Your idea is of lighting up different elements is similar to mine.

Michael

 

What’s not mentioned in my post is I have an approximately 120lbs, 29” diameter flywheel. So the participants only have to get that moving at a reasonable speed and the momentum will make easier to keep it turning....some gearing is required.

Your idea is of lighting up different elements is similar to mine.

Michael

Actually, it won't. Whatever energy is withdrawn from the flywheel must be replaced, including all of the losses, by the people cranking it. It will allow participants to slowly build up energy over a long period of time in the flywheel and then let that energy be withdrawn at a higher rate over a shorter period of time.

Have you considered using bicycle generators? They are, after all, specifically designed to be human-powered. Or the generator from a simple exercise bike in which the back wheel of the bike is set on a pair of rollers. These are intended to absorb all of the power that a human can deliver on a bike and should make a good match for what you are doing.

 

I’ll ask a different question...

I have a dc motor

Volts 90
Amps 13.3
Hp 1.5
Rpm 3000

Assuming I can get the motor turning at 500 rpms how many watts will I generate?

Thank you for you help.

I calculate the output at .03v/rev, so at 500rpm would be 15v.
What load do you want to supply Va?
Max.

 

I calculate the output at .03v/rev, so at 500rpm would be 15v.
What load do you want to supply Va?
Max.

I calculate the output at .03v/rev, so at 500rpm would be 15v.
What load do you want to supply Va?
Max.

My LEDs will max out around 25 amps...I believe that is what you are asking.

 

My LEDs will max out around 25 amps...I believe that is what you are asking.

So if these are 3 V LEDs, then you are talking about 75 W into the LEDs themselves. That's not including the inefficiency of the driving circuitry. Nor the inefficiency of the electrical conversion process. Even with 100% efficiency, you are in the realm of what most people can deliver for anything other than a very brief interval with their legs.

Unless you have multiple people powering the device simultaneously (which could well be worth incorporating into an interactive art project), you are going to be extremely hard pressed to deliver that kind of power over any period of time.

EDIT: Fix typos.

 

Unless you have multiple people powering the device simultaneously (which could well be worth incorporating into an interactive art project), you are going to be extremely hard pressed to deliver that kind of power over any period of time.

That’s interesting as I was already thinking of have multiple people input their energy.

 

Powering LED's seems like a good goal. This seems appropriate for this thread:

 

MrS,
Interesting video, thanks
As @Coenobita is a Blacksmith, I am sure he knows much easier ways to make toast.
E

 

MrS,
Interesting video, thanks
As @Coenobita is a Blacksmith, I am sure he knows much easier ways to make toast.
E

Powering LED's seems like a good goal. This seems appropriate for this thread:

Great Video!!!!

I may have to think about this a little more.

Thank you everyone for your help.

 

Once again I will sing my praises for this site and all the truly helpful people!!!

I will continue exploring this idea and I thank you for everyone’s input.

Coenobita

 

Don't give up, you can make useful power for a light, a small fan, etc.. something efficient. You just won't get tons of power to run big stuf.

 

Powering LED's seems like a good goal. This seems appropriate for this thread:

Re: the video

I must confess my surprise that even a highly trained/physically fit human is capable of neigh-on 1 horsepower (which being ≈ 746 Watts) for over a minute!... Sad that said degree of 'fitness' verges upon 'deformity', tho...

Best regards
HP

 

hi,
The Input power is the product of the applied voltage and the current thru the motor, it will not generate.
Look thru this link for more details.
https://www.micromo.com/technical-library/dc-motor-tutorials/motor-calculations

E

If it is a permanent magnet DC motor it certainly will generate. I have done exactly that with an automotive cooling fan motor/blade assembly. In a good breeze it would light a backup light bulb.

 

If it is a permanent magnet DC motor it certainly will generate.

Not only P.M. but shunt field wound DC motors, as DC generators have been constructed since Edison.
Max.

 

Re: the video

I must confess my surprise that even a highly trained/physically fit human is capable of neigh-on 1 horsepower (which being ≈ 746 Watts) for over a minute!... Sad that said degree of 'fitness' verges upon 'deformity', tho...

Best regards
HP

Well.. if you think of the general idea of the term Horsepower, roughly equating to the work output of a single horse, the fact that we are comparing the output of a single man to the output of an average horse, it's not surprising that even a super fit man cannot maintain that level of output for a long time. Machines are so powerful these days, our mental measure of output is really skewed.

 

Well.. if you think of the general idea of the term Horsepower, roughly equating to the work output of a single horse, the fact that we are comparing the output of a single man to the output of an average horse, it's not surprising that even a super fit man cannot maintain that level of output for a long time. Machines are so powerful these days, our mental measure of output is really skewed.

It would be interesting to see the same set up but with both a human and horse.

 

Not only P.M. but shunt field wound DC motors, as DC generators have been constructed since Edison.
Max.

Indeed they have! -- Then too, as you are no-doubt aware, as per Lenz all electromagnetic motors may be operated as generators --and vice-versa-- (albeit with varying degrees of efficiency)...

As a (possible) point of interest, the general term for 'electromagnetic rotating machine' is 'dynamo' -- Thus it seems said term has drifted toward synonymity with 'generator' over the course of the last century...

With unabashed pedagogical officiousness
HP

 

Well.. if you think of the general idea of the term Horsepower, roughly equating to the work output of a single horse, the fact that we are comparing the output of a single man to the output of an average horse, it's not surprising that even a super fit man cannot maintain that level of output for a long time. Machines are so powerful these days, our mental measure of output is really skewed.

Exactly!

Best regards
HP

 

It would be interesting to see the same set up but with both a human and horse.

It would... but maybe horsing around is not allowed in this place? ...