JP2754296B2 - Rotary actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary actuator which can reciprocate at a predetermined angle and can maintain a position without energization.

[0002]

2. Description of the Related Art Conventionally, as a rotary actuator of this type, a configuration example shown in FIG. 5 is known. FIG.
FIG. 1 is an exploded perspective view showing the configuration of the rotary actuator. In FIG. 1, reference numerals 1 and 2 denote a lower case main body and an upper mounting plate constituting a case, 3 denotes a shaft,
Is a movable coil, 5 is a fixed movable coil 4, and a shaft 3
Plastic molded support members for integration with the
Reference numeral 6 denotes a magnet A for applying a rotating force to the movable coil 4, reference numeral 7 denotes a pair of iron cores opposed to each other with the support member 5 interposed therebetween, reference numeral 8 denotes a stopper attached to both sides of the support member 5, and attracts to the respective iron cores 7, Reference numeral 9 denotes a magnet B fixed in the magnetic path so that the core 7 and the stopper 8 are attracted to each other when no power is supplied.
When a current is applied to the reverse magnetic coil to release the holding force of the magnet B, and when the movable coil 14 is simultaneously supplied with electricity, the movable coil itself is interacted with the magnetic flux of the magnet A. Rotates to rotate the shaft 3.

[0003]

However, the rotary actuator having such a structure has the advantage that the position of the support member can be maintained without power supply and the high-speed rotation can be obtained, but it requires many components. In addition, there is a problem that the means for wiring to the movable coil is not easy, and the assemblability is poor.

[0004] The present invention solves the above-mentioned problems of the prior art, and as in the prior art, it is possible to maintain a non-energized position, to use a small number of components, and to assemble easily. It is an object of the present invention to provide an excellent rotary actuator of a movable magnet type.

[0005]

The configuration of the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to the embodiment. , 12 rotatably mounted on shaft 14
And a support member 15 made of plastic or the like fixed to the shaft 14, a magnet 16 magnetized in the axial direction of the shaft 14 and fixed to the support member 15, A pair of coils 18, 18 fixed to 11 and 12, respectively;
18 wound around and fixed to cases 11 and 12
7 and 17, and stoppers 19, 19 for limiting the rotation range of the support member 15 so that the magnetic flux of the magnet 16 does not go out of the coil 18.

[0006]

With the above construction, according to the present invention, when no current is supplied, the magnet 16 generates an attractive force in a direction in which the center of the magnet 16 overlaps the center of the core 17, but the support member 15 integral with the magnet 16 strikes the stopper 19. Therefore, the suction force becomes a holding force for stopping at the position with respect to an external force for separating the support member 15 from the stopper 19, and the position is held on one stopper 19 side. 4, a magnetic flux 21 generated by the magnet 16 and a coil 18,
In the core 17, the magnetic flux 22 generated when the electric current flows through the core 18 is such that the cores 21b and 22b cancel each other.
The attractive force between the magnet 16 and the core 17 weakens. On the other hand, outside the coils 18, 18 a and 22 a are added in a direction in which the electromagnetic force in the Y direction acts on the coils 18, but since the coils 18 are fixed,
As a reaction, the magnet 16 moves in the X direction. And
The rotation is stopped by the stopper 19 on the opposite side.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of a rotary actuator according to the present invention, FIG. 2 is an external perspective view of an assembly showing the embodiment of FIG. 1, and FIGS. 3 (a) and 3 (b) each show an embodiment according to the present invention. Main part plan view of the example and AA cross-sectional view of FIG.
FIG. 4 is a diagram illustrating the operation of the present invention. In FIGS.
11 is a main body, and 12 is a mounting plate.
2 forms a case. 13 is a bearing fixed to the case, 14 is a shaft supported by the bearings 13 and 13, 15 is a support member fixed to the shaft 14, for example, made of plastic, and 16 is magnetized in the axial direction of the shaft 14. A permanent magnet 17 is a magnetic core fixed to long holes 11 a and 12 a formed in the cases 11 and 12, 18.
Are coils wound around the core 17 and cases 11 and 12
And the magnet 16 is sandwiched from above and below with a certain gap. Reference numeral 19 denotes a stopper fixed to the cases 11 and 12 at a position where the support member 15 collides with the core 17 so that the center of the magnet 16 does not overlap with the core 17 to limit the rotation range to a rotation angle of 30 °, and 20a and 20b are coils. It is a lead wire drawn out of the case from the terminal No. 18. With the configuration described above, in the non-energized state, the magnet 16 generates an attractive force in a direction in which the center of the magnet 16 tends to overlap the center of the core 17, but the support member 15 to which the magnet 16 is fixed is fixed.
Is in contact with the stopper 19, so that the suction force is a holding force for stopping at the position with respect to an external force for separating the support member 15 from the stopper 19, and the position is held on one stopper side. . Next, the operation principle of the rotary actuator according to the present invention will be described with reference to FIG. In the figure, reference numeral 21 denotes a magnetic flux generated by the magnet 16, of which 21 a denotes a magnetic flux passing outside the coil 18 and 21 b denotes a magnetic flux passing through the core 17. Reference numeral 22 denotes a coil 1 wound around the core 17.
8 is a magnetic flux generated when a current flows in the direction shown in FIG. Among them, 22a is a magnetic flux passing outside the coil 18,
22 b is a magnetic flux passing through the core 17. As described above, since the magnetic flux 21b and the magnetic flux 22b are in the opposite directions inside the coil 18, that is, in the core 17, the magnetic flux 21b and the magnetic flux 22b cancel each other, so that the attractive force between the magnet 16 and the core 17 is weakened. On the other hand, on the outside of the coil 18, the magnetic flux 21 a and the magnetic flux 22 a are in the same direction and are the directions to be added.
The electromagnetic force in the direction acts, but the coil 18
, The magnet 16 moves in the X direction as a reaction. FIG. 2 is an external perspective view of the disassembled parts shown in FIG. 1. The shaft 14 reciprocates at a fixed angle (for example, 30 °). Can be controlled.

[0008]

As described above in detail, according to the present invention, the following effects can be obtained. With only one kind of magnet fixed to the support member integrated with the shaft,
It is possible to hold and drive the rotating shaft, and to release and drive the holding of the rotating shaft by one type of opposed coil fixed to the upper and lower inner sides of the case. The number of components can be reduced. Further, since the coil is fixed to the case, wiring becomes easy, and an impact force is not applied during operation as in the related art.
Therefore, a highly reliable rotary actuator can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment according to the present invention.

FIG. 2 is an external perspective view showing an embodiment according to the present invention.

3 is a plan view showing a main part of an embodiment according to the present invention, and a cross-sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram showing the operation principle of the rotary actuator according to the present invention.

FIG. 5 is an exploded perspective view showing a conventional rotary actuator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Main body 12 Mounting plate 13 Bearing 14 Shaft 15 Support member 16 Magnet 17 Core 18 Coil 19 Stopper

Claims (1)

(57) [Claims] 1. A case, a shaft rotatably attached to the case, a support member fixed to the shaft, a magnet magnetized in the shaft direction and fixed to the support member, and a magnet interposed therebetween. And a coil fixed to the case and fixed to the case, a core fixed to the case, and a rotation range of the support member so that the magnetic flux of the magnet does not go out of the coil. And a core for stopping the coil when the coil is not energized.
The support member contacts the stopper due to the suction force
A rotary actuator characterized by being held in contact .