JPH05103455A - Rotary actuator - Google Patents

Abstract

PURPOSE:To materialize a highly reliable rotary actuator, which is possible of current free positional retention and is easy of assembling with a few components, by making it a mobile magnet system, in the rotary actuator which converts electric energy into torque. CONSTITUTION:A shaft 14 between the body 11 of a case and the mounting plate 12. A magnet 16 being magnetized axially is fixed to the supporting member 16 fixed to this shaft 14. Coils 18 are wound on the cores 17 fixed to the top 12 and the bottom 11 of the case, respectively. A stopper 19 is provided, which limits the pivoting range of the supporting member 15 so that the magnetic flux generated by the magnet 16 may not come out. Hereby, between the upper and lower magnets 18, the magnet 16 of the supporting member 15 can be pivotably constituted certain distance apart so that it can rotate within a specified angle range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary actuator capable of reciprocatingly rotating at a fixed angle and holding its position without being energized.

[0002]

2. Description of the Related Art Heretofore, as a rotary actuator of this type, one having a configuration example shown in FIG. 5 has been known. Figure 5
1 is an exploded perspective view showing the structure of the rotary actuator, in which 1 and 2 are a lower case body and an upper mounting plate which form a case, 3 is a shaft, 4
Is a movable coil, 5 is a fixed movable coil 4, and the shaft 3
Plastic molded support member for integration with
Reference numeral 6 is a magnet A that applies rotational force to the movable coil 4, 7 is a pair of iron cores that are opposed to each other with the support member 5 interposed therebetween, 8 is a stopper that is attached to both sides of the support member 5 and that is attracted to the iron core 7, respectively. 9 is a magnet B fixed in the magnetic path so that the iron core 7 and the stopper 8 are attracted to each other when the power is not supplied.
Is a reverse magnetic coil wound around, and when the reverse magnetic coil is energized to release the holding force of the magnet B and the movable coil 14 is energized at the same time, the movable coil itself interacts with the magnetic flux of the magnet A. Rotates to rotate the shaft 3.

[0003]

However, although the rotary actuator having such a structure has an advantage that the position of the supporting member can be held without electricity and a high speed rotation can be obtained, it requires many components. In addition, there is a problem that wiring means with the movable coil is not easy and assembly is poor.

In order to solve the problems of the prior art, the present invention is capable of holding a non-energized position and is easy to assemble with a small number of components, as in the prior art. An object of the present invention is to provide an excellent rotary actuator of a movable magnet type.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to the embodiments. , 12 rotatably attached to shaft 14
A supporting member 15 fixed to the shaft 14 and made of plastic or the like; a magnet 16 magnetized in the axial direction of the shaft 14 and fixed to the supporting member 15; A pair of coils 18 and 18 fixed to 11 and 12, respectively,
Core 1 in which 18 is wound and fixed to cases 11 and 12
7 and 17, and stoppers 19 and 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, the magnet 16 generates an attractive force in a direction in which the center of the magnet 16 overlaps with the center of the core 17 when no current is applied, but the support member 15 integral with the magnet 16 hits the stopper 19. Therefore, the suction force serves as a holding force that tries to stand still at that position against an external force that tries to separate the support member 15 from the stopper 19, and is held at one stopper 19 side. Further, in FIG. 4, the magnetic flux 21 generated by the magnet 16 and the coil 18,
In the core 17, the magnetic flux 22 generated when electricity is supplied to 18 is in a direction in which 21b and 22b cancel each other,
The attractive force between the magnet 16 and the core 17 is weakened. On the other hand, outside the coils 18 and 18, since the directions in which 21a and 22a are added are applied, electromagnetic forces in the Y direction act on the coils 18 and 18, but since the coils 18 and 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 a perspective view of an assembly appearance showing the embodiment of FIG. 1, and FIGS. An essential part plan view of the example and an AA cross-sectional view of FIG.
FIG. 4 is a diagram for explaining the operation of the present invention. 1-3,
11 is a main body, 12 is a mounting plate, and the main body 11 and the mounting plate 1
A case is formed by 2 and. Reference numeral 13 is a bearing fixed to the case, 14 is a shaft axially 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. Permanent magnets, 17 are magnetic cores fixed to the long holes 11a and 12a formed in the cases 11 and 12, and 18
Is a coil wound around the core 17 and is used for the cases 11 and 12
The magnet 16 is sandwiched from above and below with a constant gap. Reference numeral 19 is a stopper fixed to the cases 11 and 12 at a position where the support member 15 strikes against the core 17 so that the center of the magnet 16 does not overlap with the core 17 and limits the rotation range to a rotation angle of 30 °, and 20a and 20b are coils. It is a lead wire drawn out from the terminal of 18 to the outside of the case. With the above-described configuration, 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 generated.
Since it is hitting the stopper 19 more, the suction force becomes a holding force that tries to stop at that position against an external force that tries to separate the support member 15 from the stopper 19, and the position is held by one stopper side. .. Next, the operating principle of the rotary actuator according to the present invention will be described with reference to FIG. In the figure, 21 is a magnetic flux generated by the magnet 16, of which 21 a represents a magnetic flux passing outside the coil 18 and 21 b represents a magnetic flux passing through the core 17. 22 is a coil 1 wound around the core 17.
8 is a magnetic flux generated when a current flows in the direction shown in FIG. Of these, 22a is a magnetic flux passing outside the coil 18,
22b 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, they 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 21a and the magnetic flux 22a are in the same direction and in the adding direction.
Electromagnetic force acts in the direction, but the coil 18 is
The magnet 16 moves in the X direction as a reaction because it is fixed to. FIG. 2 is an external perspective view of the disassembled parts shown in FIG. 1 assembled. Since the shaft 14 reciprocally rotates at a fixed angle (for example, 30 °), the shaft 14 is directly switched. Can be controlled.

[0008]

As described in detail above, 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,
Since it becomes possible to hold and drive the position of the rotating shaft, and because it is possible to release and hold the rotating shaft by one type of opposing coil fixed to the upper and lower inner sides of the case, The number of constituent parts can be reduced. Further, since the coil is fixed to the case, the wiring is easy and the impact force is not applied during operation as in the conventional case.
Therefore, it is possible to provide a highly reliable rotary actuator at low cost.

[Brief description of 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.

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

FIG. 4 is an explanatory view showing the operating 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]

 11 Main Body 12 Mounting Plate 13 Bearing 14 Shaft 15 Supporting Member 16 Magnet 17 Core 18 Coil 19 Stopper

Claims (1)

[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 sandwiched between the case and the magnet. The coil fixed to the case, the core fixed to the case, and the rotation range of the support member so that the magnetic flux of the magnet does not go out of the coil. A rotary actuator, characterized in that it is provided with a stopper.