| US 7,511,391 B2 | ||
| Electromagnetic actuator | ||
| Hisashi Kawamoto, Chiba (Japan); Satoru Tada, Chiba (Japan); and Takashi Nakano, Chiba (Japan) | ||
| Assigned to Seiko Precision Inc., Chiba (Japan) | ||
| Filed on Feb. 27, 2006, as Appl. No. 11/364,597. | ||
| Application 11/364597 is a continuation of application No. PCT/JP2004/012295, filed on Aug. 26, 2004. | ||
| Claims priority of application No. 2003-306821 (JP), filed on Aug. 29, 2003. | ||
| Prior Publication US 2006/0145798 A1, Jul. 06, 2006 | ||
| Int. Cl. H02K 37/14 (2006.01) | ||
| U.S. Cl. 310—49R [310/40 MM; 335/272] | 11 Claims |
| 1. An electromagnetic actuator comprising:
a rotor; and
a stator around which coils are directly wound, central axes of the coils pointing generally parallel to a tangent of an outer
surface of the rotor,
wherein:
the stator is C-shaped and composed of one part;
the rotor is arranged so that a rotation axis thereof is existent in a space surrounded by the stator;
both ends of the stator having a surface respectively formed as a first magnetic pole and a second magnetic pole, each surface
of a width defined within a range from 15 to 90 degrees from a virtual base line with respect to the rotation axis serving
as a center, wherein the virtual base line is set to run a center of the rotation axis and separate the stator into left and
right; and
the stator is formed symmetrically with respect to the virtual base line.
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