My understanding of the outlandish HP ratings we see and have seen is that since electrically developed HP is measured in watts (746 of em per HP, aka 0.746 kW) which are volts x amps (and a little power factor thrown in with ac circuits). So they monitor the volts and lock the rotor monitoring the amps. Throw the switch. As the amps ramp up they watch the volts and as soon as they fall through a pre determined minimum where the product of volts and amps is a maximum that is the number used for the rating.
My opinion it's nothing but a marketing ploy to help in justifying the cost of things making you think you are getting something for your money when you aren't.
So when you are running your vacuum cleaner with an advertised 1 hp motor on a 25' 18AWG cord plugged into 120 volts and it doesn't get hot from current overloading, you know why.
Finally if you are buying a motor and want to know what it really is, multiply the line running amps (stamped on the ID plate) by the applied voltage, multiply that by 0.85 to account for internal osses, and another 0.85 for worst case power factor and you are at about what you have for a motor.
So running (120v and 16a x .85 x .85)/746 = 1.9 or about 2 hp.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
