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Electric generator that operates with few ampere-turns in field winding
| Details |
Inventors: Greene, William J.;
Assignee: Teledyne Walterboro, a Division of Teledyne Industries, Inc. (CA)
Primary Examiner: Hickey; R. J.
Assistant Examiner:
Attorney, Agent or Firm: Rogers, Eilers & Howell
The electric generator of the present invention has a plural-section main nding; and it uses uni-directional devices to permit current to flow through various sections of that winding as the rotor poles move away from various of the stator poles of that generator but to prevent current flow through those various sections as those rotor poles approach those stator poles. By preventing current flow through those various sections, as those rotor poles approach those stator poles, the present invention relieves the field winding of all need of overcoming the magnetomotive force of that main winding. As a result, fewer ampere turns are needed to enable that field winding to provide the magnetomotive force for that main winding. In some preferred embodiments of the present invention, an exciting winding has sections thereof that are wound on poles which have turns of the field winding wound thereon. That exciting winding responds to the magnetic lines of flux from the field winding to provide a power amplification that further reduces the number of ampere turns required for that field winding. The sections of that exciting winding are connected to the sections of the main winding to develop a D.C. exciting current in that main winding; and that exciting current enables that generator to provide a desirably-high output. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring particularly to FIGS.
1 and 2, the numeral 20 generally denotes the rotor of one preferred embodiment of electric generator which is made in accordance with the principles and teachings of the present invention.
That rotor is annular in configuration; and it is made from a number of identical, coaxial laminations of magnetic material--such as steel.
Each of those laminations is coated to minimize the flow of eddy currents through that rotor.
A number of inwardly-extending, circumferentially-spaced poles are formed on that rotor; and those poles are denoted by the numerals 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42 and 44.
In one preferred embodiment, the rotor 20 has twelve (12) poles, the center-to-center spacing of those poles is thirty degrees (30.
degree.
), the outer diameter of that rotor is six and four hundred and sixteen thousandths (6.
416) inches, the diametric distance between the pole faces is five and one hundred and seventy-five thousandths (5.
175) inches, the height of each pole is three hundred and thirty-eight thousandths (0.
338) of an inch, and the width of each pole face is six thousand seven hundred and seventy-four ten thousandths (0.
6774) of an inch.
That rotor is secured to the shaft of an engine which will supply the motive power for the electric generator.
The metallic content of the laminations, the coating on those laminations, the manner of interconnecting those laminations to form the rotor 20, and the mounting of that rotor are standard and usual and are not, per se, parts of the present invention.
The numeral 46 generally denotes the stator for the embodiment of electric generator of FIGS.
1 and 2; and it is annular in configuration, it is formed from a number of identical, coaxial laminations of magnetic material, and it has a number of outwardly-extending, circumferentially-spaced poles.
Each of those laminations is coated to minimize the flow of eddy currents through the stator.
There are eight (8) poles with center-to-center spacings of forty-five degrees (45
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Metal Working 
