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Re: PTO HP verses electric motor HP
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Posted by Joe Evans on February 25, 2004 at 20:23:00 from (209.41.235.28):
In Reply to: PTO HP verses electric motor HP posted by Grant on February 25, 2004 at 18:33:32:
As stated before: HP is HP is HP whether it comes from a horse, dog, tractor, or an electric motor. Shaft HP = torque x rpm/5252. Nowhere in this equation is there a qualifier as to what develops the torque and RPM. It is true that electric motors have wonderful torque reserves. Note that Nebraska MBHP readings taken at the PTO (post 1958) were observed during a two-hour test at rated RPM. So your tractor should be able to run at full power without blowing its innards all over the barn lot. If an electric motor is rated a 60 HP at a certain RPM, then that motor is capable of giving you 60 HP. If it has an efficiency of 90%, that means that 60 HP output is 90% of the HP coming in which is 60/.90 = 66.67 HP. Is the sawdust blower you bought specifically designed for sawdust? I guess the question should be: is it more efficient than your silage blower (more swept volume, more enclosed, more paddles?) Using universal fan laws: If 60 HP is absorbed by the sawdust blower running at 2000 RPM, then an 85 HP input will get you 2246 RPM assuming no losses in the geared-up drive. If you run the blower at triple the tractor PTO RPM, then only 32 HP is required. This might seem incorrect, but HP requirements on fans and blowers are really skewed by the fact that to double a blower's RPM, it takes 8x the HP.
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