JP2004153908A - Actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the latitude of rotational movement in an actuator which can move in two directions of an axial direction and a rotative direction without using a direction-of-motion converting mechanism. <P>SOLUTION: This actuator, where a moving member having a shaft is supported by a case having a stator so that it can perform movement in the axial direction of the shaft and the rotative direction around the shaft and the moving member moves in the axial direction and the rotative direction, receiving power by the stator, is equipped with an unrotatable part which has a magnetic pole as the stator, and further equipped with a rotatable part which has a magnetic pole as a moving member, and the rotatable part receives torque so that each magnetic pole opposes each other between unrotatable parts, according to the displacement of the moving member. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an actuator that can move in two directions, an axial direction and a rotational direction.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 2002-78310 discloses an actuator capable of moving in two directions, an axial direction and a rotating direction, in which a mover (plunger) having a shaft (shaft) has an air gap (gap) and a stator. In the linear actuator provided inside the (yoke) and energized by the coil to excite the magnetic path and move the mover in the axial direction of the shaft, the air gap is made nonuniform with respect to the axial displacement (stroke position). Discloses a configuration in which a motion is performed in the axial direction (linear direction) of the shaft and in the rotation direction with the shaft as the rotation axis.
[0003]
[Patent Document 1]
JP-A-2002-78310
[Problems to be solved by the invention]
However, the configuration disclosed in Japanese Patent Application Laid-Open No. 2002-78310 is useful because a simple configuration can perform two-directional motion in accordance with axial displacement without using a motion conversion mechanism. However, it was not possible to increase the degree of freedom of the rotational movement because it was necessary to perform the machining with high precision.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an actuator that can move in two directions, an axial direction and a rotational direction, without using a movement direction conversion mechanism. To improve the degree.
[0006]
[Means for Solving the Problems]
In the invention according to claim 1, a mover having a shaft is supported by a case having a stator so as to be able to perform movement in the axial direction of the shaft and in a rotational direction about the shaft as a rotation axis, and the mover is fixed by the stator. An actuator that moves in an axial direction and a rotational direction by receiving a force, comprising: a rotating fixed part having a magnetic pole as a stator; a rotating movable part having a magnetic pole as a movable element; , And receives a rotational force such that the respective magnetic poles face the rotation fixing portion in accordance with the displacement of the magnetic pole.
[0007]
Therefore, the mover receives a rotational force in accordance with the displacement in the axial direction such that the magnetic pole of the rotation fixed portion and the magnetic pole of the rotation movable portion face each other. By arranging them so that their facing directions change, the movement of the mover in the rotational direction can be set. As a result, the degree of freedom of rotational movement can be improved in an actuator that can move in two directions, axial and rotational, without using a movement direction conversion mechanism.
[0008]
According to a second aspect of the present invention, in the actuator according to the first aspect, one of the rotating movable portion and the rotating fixed portion is formed of a magnet, and the other is formed of a magnetic material.
[0009]
Therefore, since the magnetic material generates an attractive force between the magnetic poles of the magnet and the magnetic material, the change in the direction in which the rotating movable portion and the rotating fixed portion face each other with respect to the axial displacement of the mover is ± 90 °. Can be arbitrarily determined in the range of
[0010]
The invention according to claim 3 is the actuator according to claim 2, wherein the magnetic material has a different direction.
[0011]
Therefore, by setting the direction in which the rotating movable portion and the rotating fixed portion face each other in the direction of high magnetic permeability, the efficiency of the magnetic circuit is improved, and the rotating force received by the mover can be increased.
[0012]
According to a fourth aspect of the present invention, in the actuator according to the first aspect, both the rotation movable portion and the rotation fixing portion are configured by magnets.
[0013]
Therefore, there is only one positional relationship between the magnetic poles of the rotation movable part and the magnetic poles of the rotation fixed part that generate the attraction force, and therefore, the rotation movable part and the rotation fixed part with respect to the axial displacement of the mover. Can be arbitrarily determined.
[0014]
According to a fifth aspect of the present invention, in the actuator according to the first to fourth aspects, at least one of the rotatable movable portion and the rotatable fixed portion is provided in the axial direction by three or more. .
[0015]
Therefore, the direction in which the rotating movable portion and the rotating fixed portion face each other can be changed two or more times in accordance with the axial displacement of the mover. Exercise can be performed two or more times.
[0016]
According to a sixth aspect of the present invention, in the actuator according to the first aspect, a rotary movable portion is provided in a portion that contributes to an axial force of the mover.
[0017]
Therefore, since the rotating movable portion is also used to receive an axial force, the size of the actuator can be reduced.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Next, an embodiment according to the first and second aspects of the present invention will be described with reference to FIGS. The case 1 includes a housing 1a and a bearing 1b. The housing 1a is formed in a cylindrical shape with a bottom by a metal magnetic material, and has a bearing 1b at the center of the end surfaces on both sides thereof. This houses a stator 2 described later and a mover 3 excluding a part of the shaft 3a. The bearing portion 1b is a bearing formed in a hollow columnar shape having a concentric cross section, and a metal ball whose surface is smoothly processed is placed in the hollow portion. Are provided on the end faces on both sides of the housing 1a so that the central axis of the bearing 1b and the central axis of the bearing 1b coincide. These have a cylindrical shape made of a metal sphere, and a rotating direction (hereinafter referred to as a rotating direction) having its axial direction (hereinafter, referred to as an axial direction) and an axial direction as a central axis (hereinafter, referred to as a rotating axis). Can be exercised.
[0019]
The stator 2 is configured to include an axial movement fixing part S and a rotation fixing part 4. The axial movement fixing section S is configured to include a magnet 2a, a first magnetic body 2b, a second magnetic body 2c, and a coil 2d, and to apply an axial force to the axial movement movable section 3b. Used for The magnet 2a is a rare-earth permanent magnet, and has a plate-like shape obtained by removing a circle having a diameter slightly larger than the outer diameter of the axially movable portion 3b, which will be described later, from the circular shape which is substantially equal to the inner diameter of the housing 1a. Is formed. This is magnetized so that the magnetization direction (the direction from the S pole to the N pole) is the thickness direction. The first magnetic body 2b is formed of a magnetic material in the shape of a circular plate having a diameter smaller than the inner diameter of the housing portion 1a, and has a diameter at the center thereof slightly larger than the outer diameter of an axially movable portion 3b described later. Are formed. The second magnetic body 2c is formed of a magnetic material into a circular plate shape having a diameter substantially equal to the inner diameter of the housing portion 1a, and has a central portion having the same size as the through hole of the first magnetic body 2b. A through hole is formed. The coil 2d is formed by winding a copper wire so that a magnetic field is generated in the axial direction when an electric current is applied to a coil bobbin (not shown) made of resin whose inner diameter becomes a through hole of the first magnetic body 2b. . The axial movement fixing portion S is provided with a first magnetic body 2b and a second magnetic body 2c on both sides of the magnet 2a such that the axial direction is the magnetization direction. It is provided on both sides of the coil 2d symmetrically in the direction.
[0020]
The rotation fixing portion 4 is formed from a sector having a predetermined central angle whose radius is substantially the inside radius of the housing portion 1a to a sector having a radius slightly larger than the outer diameter of the rotation movable portion 5 described later. It is formed in a column shape with the cut shape as the bottom surface. These are provided symmetrically with respect to the center of the sector, and are used to apply a rotational force to the rotatable movable portion 5 with the center side as a magnetic pole. Here, the predetermined central angle of the sector is determined in consideration of a range in which a force in the rotational direction is applied to the rotary movable portion 5.
[0021]
The mover 3 includes a shaft 3 a, an axially movable portion 3 b, and a rotatable movable portion 5. The shaft 3a is a metal cylindrical shaft, and is supported by two bearing portions 1b, 1b so as to be able to move in the axial direction and the rotational direction. The axially movable portion 3b is formed in a columnar shape having a concave portion cut at a central portion in the height direction by a magnetic material so as to have a symmetrical shape with respect to the axial direction with a constant thickness. The shaft and the shaft 3a are provided on the shaft 3a so that the center axis of the shaft 3a is the same. This has the same length as the length between the N pole faces of the two magnets 2a of the axial movement fixed part S, and the concave portion has the length between the S pole faces of the two magnets 2a. Have. That is, the length of the uncut portion of the axial movement movable portion 3b is the same as the thickness of the magnet 2a. This member receives an axial force from the shaft fixing part S.
[0022]
The rotating movable part 5 is formed by connecting two columnar magnets 5a and 5b of the same size in the axial direction, and the center axis of each magnet 5a and 5b is the same as the center axis of the shaft 3a. The shaft 3a is provided such that the continuous surface is located on the central surface of the rotation fixing portion 4 in the axial direction. The magnetizing directions of the magnets 5a and 5b are substantially orthogonal to the axial direction, and the magnetic poles are provided so as to be substantially orthogonal to each other as shown in FIG.
[0023]
With the above-described configuration, the axially movable portion 3b is in a state where the axial force is balanced by the attraction force of the magnet 2a, but when a current flows through the coil 2d, a magnetic flux due to the current is generated. The state of equilibrium is lost, and the robot moves in one axial direction. When the direction of the current is reversed, the direction of the balance is broken in the reverse direction, and a force is generated in the reverse direction. Accordingly, the movement of the mover 3 in the axial direction is controlled by the direction of the current flowing through the coil 2d.
[0024]
The rotating movable portion 5 generates a rotating force such that the magnetic poles of the magnets 5a and 5b face each other at the center of the sector-shaped magnetic pole of the rotating fixed portion 4, but the movable element 3 is moved to the position shown in FIG. Position), the rotational force in the left direction by the magnet 5a and the rotational force in the right direction by the magnet 5b are balanced, so that they do not move in the rotational direction. When this is displaced from this position to the positive side in the axial direction (upward in FIG. 1), the opposing area between the magnet 5b and the rotation fixing part 4 is larger than the opposing area between the magnet 5a and the rotation fixing part 4. Therefore, the force that the magnet 5b receives from the rotation fixing portion 4 becomes dominant, and receives the rightward rotational force when viewed from the axial direction. Conversely, when the magnet 5a is displaced to the negative side (downward in FIG. 1) in the axial direction, the force that the magnet 5a receives from the rotation fixing portion 4 becomes dominant, and the rotational force in the left direction when viewed from the axial direction is reduced. receive. Therefore, the rotation movable portion 5 receives a rotational force in accordance with the displacement of the mover 3 such that the respective magnetic poles face the rotation fixed portion 4. Here, the movement of the movable element 3 in the rotation direction is set by arranging the rotation fixed part 4 and the rotation movable part 5 in the axial direction so that the opposing directions change within a range of ± 90 °. can do. Therefore, the degree of freedom of the rotational movement of the actuator that can move in two directions of the axial direction and the rotational direction without using the movement direction conversion mechanism can be improved. The reason that the change in the direction in which the rotation fixed unit 4 and the rotation movable unit 5 face each other with respect to the axial displacement of the mover 3 is within the range of ± 90 ° is that the magnetic material is the N pole of the magnets 5a and 5b. This is because both the S pole and the S pole generate a suction force.
[0025]
Next, the operation of the first embodiment will be described. First, when the coil 2d is at the reference position as shown in FIG. 1 and no current flows through the coil 2d, it is balanced in both the axial direction and the rotational direction. Here, when an AC voltage of a rectangular wave is applied to the coil 2d, an AC current flows through the coil 2d, so that the axially movable portion 3b receives a force in the axial direction, and the movable element 3 reciprocates in the axial direction. In this reciprocating motion, when the mover 3 is displaced to the positive side in the axial direction, the rotatable movable portion 5 receives a rightward rotational force from the rotatable fixed portion 4. On the other hand, when the mover 3 is displaced to the negative side in the axial direction, the rotating movable portion 5 receives a rotating force in the left direction from the rotating fixed portion 4. That is, the mover 3 reciprocates in two directions, the axial direction and the rotational direction.
[0026]
As described above, in the first embodiment, the mover 3 receives the rotational force such that the magnetic pole of the rotation fixed portion 4 and the magnetic pole of the rotation movable portion 5 face each other in accordance with the axial displacement. The movement of the movable element 3 in the rotational direction is set by arbitrarily disposing the rotating fixed portion 4 and the rotating movable portion 5 in the axial direction such that the opposing directions change within a range of ± 90 °. be able to. As a result, the degree of freedom of rotational movement can be improved in an actuator that can move in two directions, axial and rotational, without using a movement direction conversion mechanism.
[0027]
The configuration for causing the axial motion by the axial motion movable portion 3b and the axial motion fixing portion S is not limited to the configuration described here, and the configuration for generating the motion in the axial direction by flowing a current through the coil is used. Anything is acceptable.
[0028]
(Second embodiment)
Next, an embodiment according to the first to third aspects of the present invention will be described with reference to FIG. This embodiment is different from the first embodiment in that the rotation fixing section 4 is made of a magnet and the rotation movable section 5 is made of a magnetic material having a different direction. It has the same configuration as the form.
[0029]
The rotation fixing unit 4 is a permanent magnet, and is formed in the same shape and in the same positional relationship as the rotation fixing unit 4 of the first embodiment. These are magnetized such that one is oriented in the direction of the center toward the center and the other is diametrically oriented from the center.
[0030]
The rotatable movable portion 5 is formed by axially continuing two different-direction magnetic members 5d and 5e in which two thin plates having the same size are stacked in a columnar shape. The shaft 5a is provided on the shaft 3a such that the central axis of the shaft 5e is the same as the central axis of the shaft 3a and its continuous surface is located on the central surface of the rotation fixing portion 4 in the axial direction. The directions in which the magnetic permeability of the anisotropic magnetic members 5d and 5e are high are substantially perpendicular to the axial direction, and the magnetic poles are provided so as to be substantially perpendicular to each other as shown in FIG.
With the above configuration, a magnetic field is generated at the position of the rotation movable unit 5 from one side of the rotation fixing unit 4 to the other. Therefore, the differently directional magnetic members 5d and 5e of the rotary movable portion 5 receive the rotational force so that the direction of the high magnetic permeability and the direction of the surrounding magnetic field coincide with each other. In response to the displacement of the rotating member 3, the rotating movable portion 5 receives a rotating force such that each magnetic pole faces the rotating fixed portion 4. Here, since the direction in which the rotating movable portion 5 and the rotating fixed portion 4 face each other is the direction of high magnetic permeability, the efficiency of the magnetic circuit is improved and the rotation is improved as compared with the case using a magnetic material having no different directionality. Power can be increased.
[0032]
As described above, in the second embodiment, the efficiency of the magnetic circuit is improved by setting the direction in which the rotating movable portion 5 and the rotating fixed portion 4 face each other in the direction of high magnetic permeability. The received rotational force can be increased.
[0033]
(Third embodiment)
Next, an embodiment according to the first and fourth aspects of the present invention will be described with reference to FIG. This embodiment is different from the first embodiment in that the rotation fixing section 4 is formed of a magnet, and the other configuration is the same as that of the first embodiment.
[0034]
The rotation fixing unit 4 is a permanent magnet, and is formed in the same shape and in the same positional relationship as the rotation fixing unit 4 of the first embodiment. These are magnetized such that one is oriented in the direction of the center toward the center and the other is diametrically oriented from the center.
[0035]
With such a configuration, the rotating movable portion 5 and the rotating fixed portion 4 are both configured by magnets, so that the distance between the magnetic pole of the rotating movable portion 5 and the magnetic pole of the rotating fixed portion 4 is increased. There is only one stable positional relationship when the N-pole and the S-pole face each other when the suction force is generated, so that the rotation of the rotation movable portion 5 and the rotation fixing portion 4 with respect to the axial displacement of the mover 3 is performed. The change in the facing direction can be arbitrarily determined without being limited to ± 90 ° as in the first embodiment.
[0036]
As described above, in the third embodiment, there is only one positional relationship between the magnetic pole of the rotation movable part 5 and the magnetic pole of the rotation fixed part 4 that generates the attraction force. The change in the direction in which the rotating movable portion 5 and the rotating fixed portion 4 face each other with respect to the displacement in the direction can be arbitrarily determined.
[0037]
(Fourth embodiment)
Next, an embodiment according to the first and fifth aspects of the present invention will be described with reference to FIGS. This embodiment is different from the first embodiment in that the rotatable movable portion 5 is constituted by three magnets, and the other configuration is the same as that of the first embodiment.
[0038]
The rotating movable portion 5 is formed by connecting three columnar magnets 5a, 5b, 5c of the same size in the axial direction, and the center axis of each magnet 5a, 5b, 5c is the shaft 3a. It is the same as the central axis, and is provided on the shaft 3 a so that the center of the three continuous magnets is located on the central plane in the axial direction of the rotation fixing part 4. The magnetizing directions of the magnets 5a, 5b, 5c are substantially orthogonal to the axial direction, and the magnetic poles are provided so that each of them is alternately substantially orthogonal as shown in FIG.
[0039]
With such a configuration, the direction in which the rotating movable portion 5 and the rotating fixed portion 4 face each other can be changed two or more times in accordance with the displacement of the movable element 3 in the axial direction. Therefore, when the mover 3 is reciprocated in the axial direction, two or more reciprocating motions can be performed per cycle. That is, it is possible to cause the mover 3 to perform the movement in the rotation direction at a frequency twice or more the frequency of the movement in the axial direction.
[0040]
As described above, according to the fourth embodiment, the direction in which the rotating movable portion 5 and the rotating fixed portion 4 face each other can be changed twice or more in accordance with the axial displacement of the movable element 3. Two or more reciprocating motions in the rotational direction can be performed per cycle of the axial motion of the mover 3.
[0041]
(Fifth embodiment)
Next, an embodiment according to the first and sixth aspects of the present invention will be described with reference to FIGS. This embodiment is different from the first embodiment in that the rotary movable portion 5 and the axial movable portion 3b are configured to be shared, the configuration of the axial fixed portion S and the rotary fixed portion 4, The difference is that a spring 6 is provided, and the other configuration is the same as that of the first embodiment.
[0042]
The axial fixing portion S includes an E-shaped magnetic body 2e and a coil 2f. The E-shaped magnetic body 2e is made of a magnetic material and has a cross section formed in the shape of an E-shaped column. The three E-shaped magnetic poles are arranged in the axial direction, and are axially symmetric with respect to the rotation axis. And is fixedly housed in the hollow portion of the housing 1a of the case 1. In these, the E-shape is symmetrical, and the three magnetic pole portions have the same width and length. In these devices, a coil 2f is wound around a central magnetic pole portion, and when a current flows through the coil 2f, different magnetic poles are generated between the central magnetic pole portion and the magnetic pole portions on both sides. For example, if an S pole is generated at the center magnetic pole, N poles are generated at both magnetic poles. The coil 2f is provided by being wound around a central magnetic pole portion of the E-shaped magnetic body 2e via a coil bobbin (not shown) made of resin. This is to excite the E-type magnetic body 2e, and by causing a current to flow, different magnetic poles are generated in the center magnetic pole part and the magnetic pole parts on both sides of the E-type magnetic body 2e. In addition, this is connected so that the one provided on one of the paired E-shaped magnetic bodies 2e and the one provided on the other side can be excited in opposite phases. For example, when one center magnetic pole portion of the E-type magnetic body 2e is excited to be an S pole, the other central magnetic pole portion is connected so as to be excited to be an N pole.
[0043]
The rotation fixing portion 4 has a bottom surface obtained by cutting a sector shape having a radius slightly larger than the outer diameter of the rotation movable portion 5 from a sector shape having a predetermined central angle whose radius is almost the inside radius of the housing portion 1a. Magnets 4a and 4b formed in a column shape. These are provided two symmetrically with respect to the center of the sector, and are magnetized such that one is directed toward the center and the other is directed toward the diameter from the center. These components are provided outside the axial ends of the axial movement fixing portion S, which is a portion that applies an axial force to the mover 3 of the stator 2.
[0044]
The rotating movable part 5 is formed by connecting two columnar magnets 5a and 5b of the same size in the axial direction, and the center axis of each magnet 5a and 5b is the same as the center axis of the shaft 3a. It is provided on the shaft 3a so that In this case, the length in the axial direction is larger than the length of the axial movement fixing portion S, and its continuous surface is located at the center plane of the axial movement fixing portion S in the axial direction. The magnetizing directions of the magnets 5a and 5b are substantially perpendicular to the axial direction, and are magnetized so that each of them is in the opposite direction, and the magnetic poles are provided. Here, the rotating movable portion 5 is provided in a portion that contributes to the axial force of the mover 3 and is shared with the axially movable portion 3b. Therefore, the size of the actuator can be reduced.
[0045]
The resonance spring 6 is a coil spring, and is provided between the rotation movable portion 5 and the case 1 in a state where the resonance spring 6 is bent in the axial direction. These components have their ends fixed to the case 1 and the rotatable movable portion 5, and when the rotatable movable portion 5 moves in the axial direction, give a repulsive force with a force corresponding to the displacement.
[0046]
With such a configuration, the rotating movable portion 5 is in a state where the axial force is balanced by the attraction force of the magnets 5a and 5b when the current is not passed through the coil 2f. As a result, a magnetic flux is generated by this current, and the state of balance is broken, and the magnetic body moves in one axial direction. When the direction of the current is reversed, the direction of the balance is broken in the reverse direction, and a force is generated in the reverse direction. Therefore, the movement of the mover 3 in the axial direction is controlled by the direction of the current flowing through the coil 2f. Here, an AC voltage having a frequency near a resonance frequency determined by the masses of the resonance spring 6 and the mover 3 is applied to the coil 2f to cause an AC current to flow, thereby causing the coil 2f to perform a resonance motion in the axial direction. On the other hand, when displaced in the positive axial direction (upward in FIG. 7), the rotating movable portion 5 receives the repulsive force by the magnet 4a and receives the rightward rotational force, and moves in the negative direction (downward in FIG. 7). When displaced, the magnet 4b receives a suction force and receives a leftward rotation force. Therefore, according to the displacement of the mover 3, a rotational force is received so that the respective magnetic poles face the rotation fixing portion 4.
[0047]
As described above, in the fifth embodiment, the rotary movable portion 5 has the function of the axially movable portion 3b and is also used to receive an axial force, so that the size of the actuator can be reduced. .
[0048]
Although the description has been made only of the case where the rotation fixing portion 4 has two axisymmetrically, it is not limited to this, and it is possible to configure even one if the magnetic pole on one side of the rotation movable portion 5 is used. it can.
[0049]
In addition, the description has been given only of the case where the rotatable movable portion 5 is configured to continuously connect magnets and magnetic bodies having the same size. However, the present invention is not limited thereto. It may be provided. In addition, although this example has been described only for a cylindrical shape, the shape is not limited to this, and any shape can be used as long as it functions as a magnetic pole.
[0050]
【The invention's effect】
According to the first aspect of the present invention, the mover receives the rotational force in accordance with the displacement in the axial direction such that the magnetic pole of the rotation fixed portion and the magnetic pole of the rotation movable portion face each other. By arranging the moving fixed portion and the rotatable movable portion such that the opposing directions change, it is possible to set the movement of the mover in the rotational direction. As a result, the degree of freedom of rotational movement can be improved in an actuator that can move in two directions, axial and rotational, without using a movement direction conversion mechanism.
[0051]
According to the second aspect of the invention, in addition to the effect of the first aspect, the magnetic material generates an attractive force between any of the magnetic poles of the magnet. The change in the direction in which the portion and the rotation fixing portion face each other can be arbitrarily determined within a range of ± 90 °.
[0052]
According to the third aspect of the invention, in addition to the effect of the second aspect, the efficiency of the magnetic circuit is improved by setting the direction in which the rotatable movable portion and the rotatable fixed portion oppose each other in a direction of high magnetic permeability. Thus, the rotational force received by the mover can be increased.
[0053]
According to the fourth aspect of the invention, in addition to the effect of the first aspect, only one positional relationship is generated between the magnetic pole of the rotatable movable part and the magnetic pole of the rotatable fixed part. The change in the facing direction of the rotating movable portion and the rotating fixed portion with respect to the axial displacement of the mover can be arbitrarily determined.
[0054]
According to the fifth aspect of the invention, in addition to the effects of the first to fourth aspects, the opposing directions of the rotating movable portion and the rotating fixed portion are changed at least twice in accordance with the axial displacement of the mover. Therefore, two or more reciprocating motions in the rotational direction can be performed per one cycle of the axial motion of the mover.
[0055]
According to the sixth aspect of the invention, in addition to the effect of the first aspect, the rotary movable portion is also used to receive an axial force, so that the actuator can be downsized.
[Brief description of the drawings]
FIG. 1 is a central cross-sectional view showing a first embodiment.
FIGS. 2A and 2B show a main part near a magnetic pole of a rotation fixed portion and a rotation movable portion of the first embodiment, wherein FIG. 2A is a cross-sectional view taken along line AA, and FIG. It is.
FIGS. 3A and 3B show main parts near the magnetic poles of the rotation fixed portion and the rotation movable portion of the second embodiment, where FIG. 3A is a cross-sectional view corresponding to the AA cross section of FIG. 1; FIG. 3 is a cross-sectional view corresponding to a cross section taken along line BB of FIG. 1.
FIGS. 4A and 4B are cross-sectional views corresponding to the AA cross section of FIG. 1; FIG. FIG. 3 is a cross-sectional view corresponding to a cross section taken along line BB of FIG. 1.
FIG. 5 is a central sectional view showing a fourth embodiment.
FIGS. 6A and 6B show main parts near the magnetic poles of the rotation fixed portion and the rotation movable portion of the first embodiment, wherein FIG. 6A is a cross-sectional view taken along the line CC, and FIG. And (c) are EE cross-sectional views.
FIG. 7 is a central sectional view showing a fifth embodiment.
FIGS. 8A and 8B show main parts near the magnetic poles of the rotation fixed portion and the rotation movable portion according to the fifth embodiment, wherein FIG. 8A is a sectional view taken along line FF, and FIG. It is.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 1a Case part 1b Bearing part 2 Stator 2a Magnet 2b First magnetic body 2c Second magnetic body 2d Coil 2e E-type magnetic body 2f Coil 3 Mover 3a Shaft 3b Axial movable part 4 Rotation fixed part 4a Magnet 4b Magnet 5 Rotating movable part 5a Magnet 5b Magnet 5c Magnet 5d Different direction magnetic body 5e Different direction magnetic body 6 Resonant spring S Axial fixed part

Claims (6)

In a case having a stator, a mover having a shaft is supported so as to be able to perform movement in the axial direction of the shaft and in a rotational direction about the shaft as a rotation axis, and the mover receives force from the stator to rotate in the axial direction. In the actuator that moves in the direction, a rotating fixed portion having a magnetic pole is provided as a stator, and a rotating movable portion having a magnetic pole is provided as a movable member, and the rotating movable portion is rotated and fixed according to the displacement of the movable member. An actuator which receives a rotational force such that respective magnetic poles face each other with respect to the actuator. 2. The actuator according to claim 1, wherein one of the rotating movable portion and the rotating fixed portion is formed of a magnet, and the other is formed of a magnetic material. 3. The actuator according to claim 2, wherein the magnetic material is of a different direction. 2. The actuator according to claim 1, wherein both the rotating movable portion and the rotating fixed portion are configured by magnets. 5. The actuator according to claim 1, wherein at least one of the rotatable movable portion and the rotatable fixed portion is provided three or more in a row in the axial direction. 2. The actuator according to claim 1, wherein a rotation movable portion is provided at a portion that contributes to an axial force of the mover.

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