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US 6,476,701 B1Granted
Actuator
AssigneeMikuni Corporation
InventorTetsuo Muraji
Life of this patent
Estimating the term…
Abstract
In an electromagnetic actuator wherein a rotatable rotor and at least one magnetomotive force source are integrally incorporated through a magnetic path, magnets 5-1 and 5-2 magnetized with opposite polarities are provided on a part of the peripheral surface of the rotor 4. Three pole pieces 12, 13 and 14 are provided on the peripheral edge of an opening in which the rotor 4 is provided. Connecting paths 15, 16 and 18 are provided for each pair of adjacent pole pieces.
Claims23
An electromagnetic actuator comprising:
- a rotatable rotor comprising a magnet having at least one magnet member magnetized so as to have a north pole and a south pole and disposed on part of a peripheral portion of said rotor, said north pole and said south pole being circumferentially spaced on said rotatable rotor, and said magnet being rotatable with said rotatable rotor;
- at least one magnetomotive force source assembled with said rotatable rotor;
- and
- at least one magnetic path forming member assembled with said rotatable rotor and said at least one magnetomotive force source so as to form three pole pieces on a peripheral edge of an opening receiving said rotatable rotor, including a center pole piece and two end pole pieces, such that when said at least one magnetomotive force source is not energized, two magnetized surfaces of said magnet corresponding to said north pole and said south pole face said center pole piece;
- wherein said two end pole pieces are each in contact with said center pole piece or are adjacent to said center pole piece with a gap therebetween;
- wherein said three pole pieces include at least one adjacent pair of pole pieces that are connected by a magnetic path of said at least one magnetic path forming member;
- and
- wherein one of said end pole pieces has an outwardly projecting space that is provided asymmetrically in said opening such that lengths of portions of said two end pole pieces that face said rotor are different from each other.
5 more elements
An electromagnetic actuator comprising:
- a rotatable rotor comprising a magnet having at least one magnet member magnetized so as to have a north pole and a south pole and disposed on part of a peripheral portion of said rotor, said north pole and said south pole being circumferentially spaced on a periphery of said rotatable rotor, and said magnet being rotatable with said rotatable rotor;
- at least one magnetomotive force source assembled with said rotatable rotor;
- and
- at least one magnetic path forming member assembled with said rotatable rotor and said at least one magnetomotive force source so as to form three pole pieces arranged side by side to partly surround said rotatable rotor and adjacent to said at least one magnetomotive force source and so as to form magnetic connecting paths for connecting each adjacent pair of said three pole pieces such that when said at least one magnetomotive force source is not energized, two magnetized surfaces of said magnet corresponding to said north pole and said south pole face one of said three pole pieces.
1 more element
An electromagnetic actuator comprising:
- a rotatable rotor comprising at least one permanent magnet that is fixed and rotatable therewith and magnetized so as to have a north pole and a south pole circumferentially spaced on said rotatable rotor;
- at least one magnetomotive force source assembled with said rotatable rotor;
- and
- a yoke assembled with said rotatable rotor and said at least one magnetomotive force source forming three pole pieces partly circumferentially surrounding said rotatable rotor and positioned adjacent to said at least one magnetomotive force source, said yoke forming magnetic connecting paths for connecting adjacent pairs of said three pole pieces such that when said at least one magnetomotive force'source is not energized, two magnetized surfaces of said magnet corresponding to said north pole and said south pole face one of said three pole pieces.
1 more element
Dependencies are inferred from the claim text.