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Re: PTO HP verses electric motor HP
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Posted by Bob M on February 25, 2004 at 19:29:39 from (66.67.9.170):
In Reply to: PTO HP verses electric motor HP posted by Grant on February 25, 2004 at 18:33:32:
From a strict engineering standpoint, horsepower is work divided by time. Where horsepower comes from doesn't matter - can be a tractor PTO, electric motor....or a horse. A horsepower is a horsepower. However in the real world, for a tractor PTO it's good practice to limit the shaft load to about 85% of the tractor's max horsepower. This leaves a reserve to pull through brief overloads, etc. So a 60 HP tractor should be capable of about 51 HP continuous on the shaft. On the other hand an electric motor is fine for power output up to 100% of it's nameplate rating. And most industrial motors can be run safely at 115% or more of rating. So a 60 HP motor may safely pull 69 HP on a continuous basis - 18 HP more than the "same" 60 HP tractor PTO. In addition, electric motors have enormous torque reserve capacity - as much as 5 times the normal running torque. That means a 60 HP electric motor will easily pull through an overload that would instantly stall a 60 HP tractor PTO. Now I don't know the answer to your specific question. But at least you can see how an electric motor can far outperform a tractor PTO of the same rated HP.
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