Force Needed to Turn Generator at Maximum Output

[Giesick]

Hi I was hoping someone could tell me the approx. amount of radial force needed to keep a 10000W generator turning while producing maximum output if there is a 1ft pulley connected to it that does the turning.
Thanks

 

[mgb_phys]

There shouldn't be any radial force to keep a generator turning.

Energy is force * distance, and power is energy/time.
So if you have a 1 metre radius drive wheel on the turbine and a force of 1 Newton at the edge pushing it around then the energy for each turn will be 2*pi*1 = 6.3 Joules, if you turn it once/second you will get 6.3Watts.

 

[Giesick]

When generator has a load on it, it becomes more difficult to turn. So how many N do you need to turn it while it produces 10000W if the drive wheel is 0.3m?

 

[mgb_phys]

I could turn it at one rpm with 10,000N or at 60Hz with 2.8N
Depends on the generator - normally they are designed for a particular speed which depends on the electricty frequency, the number of phases and the generator design.

 

[russ_watters]

Assuming perfect conversion of mechanical to electrical work, power=rpm*torque. You should be able to take it from there.

 

[Giesick]

So if there are 746 watts/horsepower for turning it and the generator frame is 78% efficient. What would the motive force be for my 10,000 watt goal.

 

[russ_watters]

C'mon, make an attempt to calculate it with the formula given! This site is for learning, not spoon feeding!

 

[Dr.D]

Power = rpm * torque only in some amazingly bastardized units!

Power = omega * T = (2*pi*rpm/60) * Torque

in more conventional SI units.