JP3666618B2 - Actuator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an actuator for a throttle that can control a position according to a coil current without a spring.
[0002]
[Prior art]
The throttle actuator needs to move a moving body (for example, a rotor) according to a driving force (magnetomotive force source) corresponding to the magnitude of current. In general, in this type of technology, the rotor is stopped by using a spring that generates a reaction force proportional to the rotor position. However, as an actuator that does not require a spring, the applicant, for example, Japanese Patent Application No. 7-56686. (Referred to as prior art) has already been proposed.
[0003]
The outline of the prior art will be described with reference to FIG. In FIG. 4, the actuator body 1 is composed of a yoke member having a symmetrical structure, and has two magnetic pole pieces 2 and 3 and connecting members 4a and 4b. There is a main air gap 5 between the pole pieces 2 and 3, and auxiliary air gaps 6-1 and 6-2 are provided on both sides of the main air gap.
[0004]
A rotor 7 made of a permanent magnet is disposed in the main air gap 5 and rotates through a shaft 8. Reference numeral 9 denotes an electromagnetic coil (magnetomotive force source). Therefore, when the electromagnetic coil 9 is not energized, the magnetic flux emitted from the N pole of the rotor returns to the S pole via part of the pole pieces 2 and 3 on both sides and stops at the position shown in the figure. Keeps the state.
[0005]
Here, when the electromagnetic coil 9 is energized, the magnetomotive force generated here is stored in the main air gap 5, the sub air gaps 6-1, 6-2, and the magnetoresistive gap 10 which are magnetic resistances in the magnetic path. The rotor 7 stops at a position that minimizes these energies. The energy stored here functions as a spring as a source of reaction force. These are fully explained in the prior art.
[0006]
[Problems to be solved by the invention]
In the case of the above apparatus, as shown in the side view of FIG. 4B, the yoke member is laminated, and as can be seen from FIG. 4A, the electromagnetic coil 9 provided in the connecting portion is square. I have to be.
[0007]
If the electromagnetic coil is square, more wires are required to obtain the same magnetomotive force than in the case of a cylindrical coil, which increases the weight as well as the amount of heat generated. Further, the man-hours for adjusting the coaxial of the magnetic pole pieces 2 and 3 and the rotor 7 and the air gap 10 by two yoke members also become a problem.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a throttle actuator that reduces the weight of the main body, reduces the amount of heat generation, and reduces the number of manufacturing steps.
[0009]
[Means for Solving the Problems]
An actuator according to claim 1 of the present invention connects two opposing pole pieces and at least one high magnetoresistive portion that generates magnetic saturation, and forms a main air gap by a space surrounded by these, A rotor composed of a permanent magnet that rotates integrally with the drive shaft is disposed in the main air gap so that the main air gap rotates, and the yoke members at the ends of the magnetic pole pieces are magnetically connected to each other. In an actuator that connects these components integrally as a connection magnetic path, and provides a magnetomotive force source with an electromagnetic coil wound around the connection magnetic path to apply a driving force to the rotor, the core at the position of the connection magnetic path The shape is a cylindrical structure with a separate structure, and an air gap is provided in the separately structured gap so that magnetic energy can be stored.
[0010]
An actuator according to a second aspect of the present invention is the actuator according to the first aspect, wherein one of the high magnetic resistance portions is an air gap.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing an embodiment of an actuator according to the present invention. In FIG. 1, the same functional parts as those in FIG. First, the main body 1 was mechanically integrated with the magnetic pole pieces 2 and 3 with the sub air gaps 11-1 and 11-2 having a narrow sectional area.
[0013]
This is because magnetic saturation occurs when the actuator operates. In addition, the core 12 is formed in a cylindrical shape to be separate bodies 12a and 12b, and an air gap 13 is provided therebetween.
[0014]
Accordingly, as operations, the auxiliary air gaps 11-1 and 11-2 are integrated to cause magnetic saturation and have a function as a magnetic resistance, and the magnetic energy is stored in the air gap 13 to have a spring function. The action of the actuator itself is as shown in the conventional example.
[0015]
According to the present embodiment, since the core is a separate cylindrical body, not only the wire of the electromagnetic coil can be reduced, but also the amount of heat generation is reduced, and the main body is integrated. Adjustment is easy.
[0016]
FIG. 2 is a block diagram showing another embodiment of the actuator according to the present invention. In FIG. 2, the same functional parts as those in FIG.
[0017]
2 has a cylindrical shape in which a magnetic path (core) 14 to be coupled is integrated, and one side surface of the cylindrical magnetic path (core) and a side surface of the magnetic path coupled to the magnetic pole piece. An air gap 13-1 is provided between them. The operation of the present embodiment is substantially the same as that of FIG.
[0018]
FIG. 3 is a block diagram showing still another embodiment of the actuator according to the present invention. In FIG. 3, the same functional parts as those in FIG.
[0019]
The structural feature of this embodiment is that one of the two magnetoresistive portions is an air gap 14, and the other is the same as in FIG. According to the present embodiment, the same effect as in FIG. 1 can be obtained.
[0020]
【The invention's effect】
As described above, according to the present invention, the magnetic pole (yoke) is integrally formed via the two high magnetoresistive portions, the cylindrical core is inserted at the connecting position of the yoke member, and the coil is inserted at this position. Since the main magnetomotive force source is provided, the main body is reduced in weight, and at the same time, the amount of heat generation is reduced, and the number of manufacturing steps and adjustment are reduced.
[Brief description of the drawings]
Diagram showing a first embodiment of the actuator according to the invention; FIG.
FIG. 2 is a configuration diagram showing a second embodiment of an actuator according to the present invention.
FIG. 3 is a configuration diagram showing a third embodiment of an actuator according to the present invention.
FIG. 4 is a diagram showing a conventional apparatus.
[Explanation of symbols]
1 Main body 2, 3 Pole pieces 4a, 4b Connecting member 5 Main air gap 6-1, 6-2 Sub air gap 7 Rotor 8 Shaft 9 Electromagnetic coils 10, 13, 14 Air gap 11-1, 11-2 High magnetism Resistor 12 core

Claims (2)

Two opposing magnetic pole pieces and at least one high magnetoresistive portion that causes magnetic saturation are connected, and a main air gap is formed by a space surrounded by these, and the drive shaft is integrated in the main air gap. A rotor composed of a rotating permanent magnet is arranged to rotate in the main air gap, and the yoke members at the end of the magnetic pole piece are magnetically connected to form an integrated magnetic path. In the actuator for providing a driving force to the rotor by providing a magnetomotive force source in which an electromagnetic coil is wound on the connecting magnetic path, the core shape at the position of the connecting magnetic path is a cylindrical shape and has a separate structure. An actuator characterized in that an air gap is provided in the separately structured gap so that magnetic energy can be stored . 2. The actuator according to claim 1, wherein one of the high magnetic resistance portions is an air gap .

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