Linear actuator
AssigneeThk Co., Ltd.
InventorJunichiro IWAKI
Life of this patent
Estimating the term…
Abstract
Provided is a linear actuator wherein a moving element can be moved in a direction normal to the direction of arrangement of coils. The moving element 1 has first to third magnets 6a-6c arranged in the X-direction. Each of the first to third magnets 6a-6c has N poles and S poles arranged in the θ-direction. The N poles and S poles of the second magnet 6b are shifted in the θ-direction relative to the N poles and S poles of the first magnet 6a. The N poles and S poles of the third magnet 6c are shifted in the θ-direction relative to the N poles and S poles of the second magnet 6b. A stator 2 has at least two salient poles 8a arranged in the θ-direction, and at least two coils 4a, 4b wound around the salient poles 8a.
Claims21
1-8. (canceled)
A linear actuator including a first member that is movable relative to a second member in a direction,
- the first member having a first magnet, a second magnet, and a third magnet arranged in said direction,
- each of the first magnet, the second magnet, and the third magnet having N poles and S poles in a direction perpendicular to said direction,
- the N poles and the S poles of the second magnet being shifted from the N poles and the S poles of the first magnet in the direction perpendicular to said direction,
- the N poles and the S poles of the third magnet being shifted from the N poles and the S poles of the second magnet in the direction perpendicular to said direction,
- the second member having at least two salient poles, which are arranged in the direction perpendicular to said direction and face the first member, and also having at least two coils, which are arranged in the direction perpendicular to said direction and wound around said salient poles respectively, and
- the at least two coils including an A-phase coil and a B-phase coil which is shifted from the A-phase by 90 degrees in phase, the A-phase coil and a /B-phase coil which is shifted from the A-phase by 270 degrees in phase, an /A-phase coil and the /B-phase coil which is shifted from the /A-phase by 90 degrees in phase, the /A-phase coil and the B-phase coil which is shifted from the /A-phase by 270 degrees in phase, or a coil which is magnetized by a sine wave and a coil which is magnetized by a cosine wave.
Dependencies are inferred from the claim text.