Hello,

I’m planning on making a free wheeling generator with some parts I salvaged.

I have a 70kg flywheel (29” in diameter) and two dc treadmill motors.

Motor A turns only clockwise and I’ll use this to drive the flywheel.
Volts 130DC
Amps 16.6
HP 2.5
RPM 3200

Motor B turns both directions
I’ll use this as the generator
Volts 90
Amps 13.3
HP 1.5
RPM 3000

Assuming I can get the flywheel turning at 500 rpms my question is how many watts will I generate? I could probably get the wheel turning much faster if you think this would be better.

Will the generator keep the drive motor turning with electricity to spare?

I’m not good with the math!

Thank you for you help.

 

Will the generator keep the drive motor turning with electricity to spare?

It most certainly will not.
Further there will not even be enough energy to keep the flywheel spinning.

 

It most certainly will not.
Further there will not even be enough energy to keep the flywheel spinning.

What size generator would I need?

 

Will the generator keep the drive motor turning with electricity to spare?

No, you will never get more back than you put in and that will always be the bottom line. There are losses all along the way, things like friction and heat losses. There is no over unity and flywheels aside you can't power a motor which is powering a generator and expect to get more back than invested.

I see Albert already covered thiis.

Ron

 

What size generator would I need?

It's not about generator size. I have an 8 horsepower engine (gasoline) driving a generator. The best I can get out is 4,000 watts continuous power. One horsepower in a perfect world is 746 watts so I should be able to get 5,968 watts but only get 4,000 watts. My system is only 67% efficient and that is as good as it gets. You can't get something from nothing and you can't get more out than you put in.

Ron

 

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