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Ngine running at 900 RPM to power a generator

  1. Jul 4, 2009 #1
    I am trying to use an engine running at 900 RPM to power a generator that needs to run at 1800 RPM ( This will go through a pulley)

    My question is is half the available horsepower to the generator lost since the RPM's are doubled?
    In other words, do I need to double the horsepower of the engine to do this?
     
  2. jcsd
  3. Jul 5, 2009 #2
    Re: Pulley/Horsepowercalculations

    I don't think so. The RPM's are doubled, so the torque is halved, but I think the same amount of energy will be transferred, so you will have the same horsepower. Aside from the energy lost in the pulley (depending on its efficiency), I think the same engine will still work.
     
  4. Jul 5, 2009 #3
    Re: Pulley/Horsepowercalculations

    Thanks Airman.
     
  5. Jul 5, 2009 #4
    Re: Pulley/Horsepowercalculations

    I would still like someone to back me up on that. Does it sound right to the rest of you?
     
  6. Jul 28, 2009 #5
    Re: Pulley/Horsepowercalculations

    Airman,

    Yes you are correct, the faster pulley will half the torque but the motor torque will remain the same.

    Torque = Watts/ (2xpi x revs per sec) in Nm

    the rest of your answer is correct also.
     
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