Three things affect the ability of a generator to generate, or a motor to provide mechanical power. The design of the windings and the coupling of their magnetic field to rotating iron. or rotating iron coupling to stationary windings. The voltage at which it operates. And the use and control of eddy currents. Electric motor and generator engineers use powerful computer programs and experimental testing to design windings that produce shaped fields of magnetism which are very efficient. Many motors and alternators today are based on extreme permanent magnets, and thus reduce the internal use of power to make fields. The higher the voltage the better the efficiency (up to the point that insulation reduces the amount of copper in the windings). High voltage passes more watts (power) for the same size wire) Eddy currents are stray magnetically induced currents that are (in the sense of this discussion only) found where variable magnetism induces electricity in loops of current in solid metal. (kind of a tiny local short circuit.) these are paracitic, and take energy that could be used for the device purpose, but is wasted in heat, or wasted in mechanical force because the current produces magnetism opposite of the input and slows down the shaft. In conclusion there are vast differences between motors generators, and alternators. Even of similar look. Efficiencies in expensive motors designed in the last few years can approach 85 to 90% energy in mechanical force out. Old starter motors might make 50%. All motors use a idle current draw that is a function (to a degree) of resistance under no load. As loads are applied, the drag on the rotor changes the rotors position related to the applied magnetism and that allows it to draw more electricity, and do more work. Jim
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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
... [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.
