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Re: Re: Re: PTO HP verses electric motor HP
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Posted by Joe Evans on February 25, 2004 at 21:24:37 from (209.41.235.28):
In Reply to: Re: Re: PTO HP verses electric motor HP posted by Grant on February 25, 2004 at 20:42:15:
In order to make the universal fan law work (as far as I know) you have to have a known HP and a known RPM and use this as a benchmark. I assumed that the 60 HP motor at 2000 RPM moving the cu ft amounts of your dust at the distance you require is going to absorb the full capability of that 60 HP motor. Remember, just because the 60 HP motor is powered up does not mean that it is developing 60 HP. Throw an amprobe on the input leads to the motor when it has no load and you will see relatively little amperage draw (HP in). It must be doing work, that is, moving a mass be it air or a combination of air and sawdust and that mass has to be enough for the motor to torque against. This goes for the 85 HP tractor. Just because it's running does not mean it is developing 85 HP. It's CAPABLE of it, but it must be loaded down so that it develops torque. You are assuming that 85 HP is being developed running the silage blower at 1000 RPM. Then again, the silage blower is not the sawdust blower--a different animal. So, using the fan law equation and the benchmark 60 HP at 2000 RPM, you can say "if 60 HP gets me this, then 85 HP gets me that". You can work the equation backwards for RPMs less than the benchmark 2000. This all came about my being fascinated with our tractor club's Baker Test Fan. Same principals apply to it according to an engineer. If you want to look at the HP tables I have developed for it, you can check our website. This may make it more clear.
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