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US 2010/0133942 A1Published application
Permanent Magnet Arrangement for Generator Rotor
AssigneeMcMillan Electric Company
InventorsVincent Hall, Stephen G. Crain
Life of this patent
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Abstract
An electric generator rotor having one or more permanent magnets coupled thereon. The permanent magnets provide a constant magnetic field in the rotor at all times, therein minimizing the effect of rotor residual magnetism on the start-up characteristics of the electric generator. The type and placement of the one or more permanent magnets on the rotor and/or magnetic field confinement techniques may be utilized to control spatial distribution of magnetic field within the rotor.
Claims16
An electric generator comprising:
- a stator core having a stator winding;
- a rotor having a rotor winding, the rotor being positioned within the stator core and being freely rotatable on a main rotor axis;
- a first permanent magnet having one or more first complementary magnetic poles coupled at a first end of the rotor;
- and
- a second permanent magnet having one or more second complementary magnetic poles coupled at a second end of the rotor;
- wherein a permanent magnetic field is generated in the rotor from the permanent magnet to induce an electromotive force in the stator winding upon rotation of the rotor.
3 more elements
An electric generator comprising:
- a stator core having a stator winding;
- a rotor having a rotor winding, the rotor being positioned within the stator core and being freely rotatable on a main rotor axis;
- a first permanent magnet being formed of a single body and having one or more first complementary magnetic poles coupled to one or more ends of the rotor, the a first field of the first permanent magnet being directed by three first laminations;
- and
- a second permanent magnet being formed of a single body and having one or more second complementary magnetic poles coupled to one or more ends of the rotor, a second field of the second permanent magnet being directed by three second laminations;
- wherein the first complementary magnetic poles of the rotor are a mirror image of the second complementary magnetic poles;
- and
- wherein a permanent magnetic field is generated in the rotor from the first and second permanent magnets to induce an electromotive force in the stator winding upon rotation of the rotor at a frequency of 53 Hz.
5 more elements
A method of creating an electric generator, comprising:
- providing first and second permanent magnets having a plurality of laminations;
- coupling the first permanent magnet to a first portion of a rotor and the second permanent magnet to a second portion of the rotor of the electric generator to augment or replace residual magnetism of the rotor;
- starting the electric generator to allow the rotor to spin along a main rotor axis of the electric generator;
- allowing the electric generator to induce an electromotive force in a stator winding of the electric generator at a minimal rotational frequency.
1 more element
Dependencies are inferred from the claim text.