bidirectional driver

Abstract

The present application aims to provide a bidirectional driver capable of limiting the stroke amplitude of a movable member during operation and capable of maintaining the movable member during non-operation. The structure of the bidirectional driver (driver (100)) of the present application is characterized in that the bidirectional driver (driver (100)) is provided with a coil (110) wound in a cylindrical shape, a fixed yoke (120) covering the coil (110), and a movable member (130) bidirectionally moving in the axial direction of the coil (110) on the inner side of the fixed yoke (120), the inner peripheral surface of the fixed yoke (120) being formed with slits (122) in the circumferential direction, two magnets (upper magnet (132a), lower magnet (132b)) with opposite magnetic poles being arranged in the axial direction in the movable member (130), a movable yoke (134) protruding in a flange shape being arranged between the two magnets, and the movable yoke (134) being arranged between the slits (122) of the fixed yoke (120).

Description

Technical Field

[0001] The present invention relates to a bidirectional drive capable of actively moving a shaft in both directions. Background Technology

[0002] As a typical driver using a coil and a movable iron core, the linear driver disclosed in Patent Document 1 can be exemplified. The linear driver of Patent Document 1 includes: a fixed body having a coil wound into a ring shape; and a movable body having a first movable body-side yoke and a pair of magnets, with the circumferential surface of the first movable body-side yoke facing each other on the inner or outer side of the coil, such that the same poles of the pair of magnets are oriented towards the first movable body-side yoke, and the pair of magnets are stacked on both sides of the first movable body-side yoke in the axial direction.

[0003] Furthermore, in the linear actuator of Patent Document 1, the movable body is driven along the axial direction by energizing the coil. According to the structure of Patent Document 1, it is only necessary to magnetize the magnet in the axial direction. Therefore, unlike the case of magnetizing the magnet in the radial direction, it is easy to magnetize even when miniaturized, making it suitable for mass production.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2006-158135 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] In the case of a bidirectional actuator, it is necessary to control the stroke range of the movable part during operation. In Patent Document 1, bearing plates (bearing members) are fixed to the openings on both sides in the axial direction of the fixed body. Thus, the stroke range of the movable part during operation is limited by the bearing plates (bearing members). However, with the structure of Patent Document 1, it is impossible to maintain the movable part when not in operation. Therefore, the position of the movable part when not in operation cannot be limited, and the operation when not in operation becomes unstable.

[0009] The purpose of this invention is to provide a bidirectional actuator that can limit the stroke range of the movable part during operation and maintain the movable part when not in operation.

[0010] Solution for solving the problem

[0011] To address the aforementioned issues, a representative structure of the bidirectional driver of the present invention is characterized by comprising: a coil wound into a cylindrical shape; a fixed yoke covering the coil; and a movable member that moves bidirectionally in the axial direction of the coil from the inside of the fixed yoke. A circumferential slit is formed on the inner circumferential surface of the fixed yoke. In the movable member, two magnets with opposing magnetic poles are arranged along the axial direction, and a movable yoke protruding in a flange shape is arranged between the two magnets. The movable yoke is positioned between the slits of the fixed yoke.

[0012] According to the above structure, in the movable member, a movable magnetic yoke protruding in a flange shape is disposed between the two magnets and between the slits of the fixed magnetic yoke. Therefore, during bidirectional drive operation, the movable member moves within the range of the slits of the fixed magnetic yoke. Thus, the stroke range of the movable member during operation can be better limited. Furthermore, during non-operation, the movable member is attracted and held at one of the two ends of the slit of the fixed magnetic yoke. Therefore, stable operation during non-operation is achieved.

[0013] Preferably, a second movable magnetic yoke is provided on the outer side of each of the two magnets, centered on the aforementioned flange-shaped movable magnetic yoke. This structure reduces the air gap in the magnetic path, thus improving the aforementioned effects.

[0014] The effects of the invention

[0015] According to the present invention, a bidirectional actuator is provided that can limit the stroke range of the movable part during operation and can maintain the movable part when not in operation. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of the bidirectional driver in this embodiment.

[0017] Figure 2 This is a diagram illustrating the driver in its excitation state (running).

[0018] Figure 3 This is a diagram illustrating another example of the bidirectional driver of this embodiment.

[0019] Figure 4 This is a diagram illustrating yet another example of the bidirectional driver of this embodiment.

[0020] Explanation of reference numerals in the attached figures

[0021] M0, magnetic flux; M1, magnetic flux; M2, magnetic flux; 100, actuator; 110, coil; 120, fixed yoke; 122, slit; 124, end; 126, end; 130, movable part; 132a, upper magnet; 132b, lower magnet; 134, movable yoke; 136, flange; 200, actuator; 220, fixed yoke; 224, inclined surface; 230, movable part; 238, inclined surface; 300, actuator; 302a, 302b, second movable yoke. Detailed Implementation

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific values ​​shown in these embodiments are merely illustrative to facilitate understanding of the invention and do not limit the invention unless specifically stated otherwise. Furthermore, in this specification and the accompanying drawings, elements having substantially the same function or structure are labeled with the same reference numerals, and repeated descriptions are omitted. Additionally, illustrations of elements not directly related to the present invention are omitted.

[0023] Figure 1 This is an overall structural diagram of the bidirectional driver (hereinafter referred to as driver 100) of this embodiment, showing the state in which the coil 110 is not energized on both sides, that is, the state in which the driver 100 is not running. The driver 100 of this embodiment does not have a distinction between up, down, left, and right. When the expression "up, down, left, and right" is used in the following description, it refers only to up, down, left, and right in relation to the accompanying drawings.

[0024] Figure 1 The driver 100 shown has a coil 110 wound into a cylindrical shape. The coil 110 is covered by a fixed magnetic yoke 120. The fixed magnetic yoke 120 is made of magnetic material and forms a magnetic circuit.

[0025] A movable member 130, which can move bidirectionally along the axial direction of the coil 110, is disposed inside the fixed magnetic yoke 120. Within the movable member 130, two magnets (hereinafter referred to as the upper magnet 132a and the lower magnet 132b) with opposing magnetic poles are disposed along the axial direction, and a movable magnetic yoke 134 protruding in a flange shape is disposed between the two magnets. In this embodiment, the opposing magnetic poles of the upper magnet 132a and the lower magnet 132b are designated as N poles, and the magnetic pole opposite to the N pole is designated as the S pole.

[0026] A circumferential slit 122 is formed on the inner circumferential surface of the fixed yoke 120 near the center of the coil 110. The flange portion 136 of the movable yoke 134 is arranged to be inserted into the slit 122 of the fixed yoke. Furthermore, the flange portion 136 of the movable yoke 134 becomes the N pole because it is held by the N pole of the upper magnet 132a and the N pole of the lower magnet 132b.

[0027] exist Figure 1 The illustration shows a state in which, in the non-excited state (not in operation), the flange 136 of the movable yoke 134 is attracted to and held on the upper part of the slit 122 by the fixed yoke 120. Figure 1 In the driver 100 in the non-excited state shown, the magnetic flux M1 of the upper magnet 132a flows from the N pole through a portion of the movable yoke 134 and a portion of the fixed yoke 120 to the S pole of the upper magnet 132a. The magnetic flux M2 of the lower magnet 132b flows from the N pole to the S pole of the lower magnet 132b by rotating significantly around the flange 136 and the fixed yoke 120.

[0028] Figure 2 This is a diagram illustrating the driver 100 in its excitation state (running). Figure 2 (a) is a diagram of the driver 100 in the state where current flows (excitation state). Figure 2 (b) indicates that there is a connection with Figure 2 The driver 100 is in a state where current flows in the opposite direction (excitation state).

[0029] In making the current in Figure 2 When the magnetic flux flows in the coil 110 shown in (a), the magnetic flux M1 of the upper magnet 132a and the magnetic flux M2 of the lower magnet 132b flow along the same path. Figure 1 The current flows in the same direction. Furthermore, when current flows, coil 110 becomes energized, generating a magnetic flux M0 flowing in the fixed yoke 120. At this time, the upper end 124 of the slit 122 of the fixed yoke 120 becomes the S pole, and the lower end 126 of the slit 122 of the fixed yoke 120 becomes the N pole. Therefore, the flange 136 of the movable member 130 repels the lower end 126 of the slit 122 and attracts the upper end 124 of the slit 122. Then, when... Figure 2 When the current supply is stopped in state (a), the movable element 130 is attracted at end 124 and held to the fixed yoke 120.

[0030] On the other hand, when Figure 2 When the current flows in the coil 110 in the opposite direction as shown in (b), the coil 110 becomes energized in the opposite direction, and the magnetic flux M0 flowing in the fixed yoke 120 is reversed. At this time, the upper end 124 of the slit 122 of the fixed yoke 120 becomes the N pole, and the lower end 126 of the slit 122 of the fixed yoke 120 becomes the S pole. As a result, the flange 136 of the movable member 130 repels the upper end 124 of the slit 122, and an attractive force is generated between the flange 136 and the lower end 126 of the slit 122, so the movable member 130 moves downward.

[0031] When the movable member 130 moves downward, the magnetic flux M1 of the upper magnet 132a flows from the N pole to the S pole of the upper magnet 132a through the flange 136 and the fixed yoke 120. The magnetic flux M2 of the lower magnet 132b flows from the N pole to the S pole of the lower magnet 132b through a portion of the movable yoke 134 and a portion of the fixed yoke 120. Furthermore, when... Figure 2 When the current supply is stopped in state (b), the movable member 130 is attracted at end 126 and held to the fixed yoke 120.

[0032] As described above, in the driver 100 of this embodiment, by disposing the flange 136 of the movable yoke 134 between the slits 122 of the fixed yoke 120, the movable member 130 can move within the range of the slits 122 of the fixed yoke 120. Therefore, the stroke range of the movable member 130 during operation can be better limited.

[0033] Furthermore, as described above, when the coil 110 is in a non-excited state, the movable member 130 is attracted to and held on the fixed yoke 120 at the end that is closer to it during excitation. Therefore, the position of the movable member 130 can be maintained even when not in operation.

[0034] Figure 3 This is a diagram illustrating another example of the bidirectional driver of this embodiment. Figure 3 The bidirectional actuator shown (hereinafter referred to as actuator 200) has inclined surfaces 224 above and below the slit 122 of the fixed yoke 220. On the other hand, the movable member 230 has inclined surfaces 238 above and below the flange portion 136.

[0035] like Figure 1 As shown, when the end face of the slit 122 is flat and the upper and lower surfaces of the flange portion 136 of the movable member 130 are also flat, there is a relationship where the adsorption force increases sharply inversely proportional to the square of their distance (interval).

[0036] However, as Figure 3 As shown, by aligning the inclined surfaces 224 and 238, the gap (interval) between the movable member 230 and the fixed yoke 220 can be reduced starting from a position away from the top and bottom dead centers of the movable member 230. That is, the attraction force based on the magnetic force between the movable member 230 and the fixed yoke 220 can be gradually increased. Therefore, a desired attraction force can be generated within the stroke range of the movable member 230, enabling stable operation. Furthermore, since the magnetic force can be suppressed, the impact and noise when the flange 136 abuts against the fixed yoke 220 can be mitigated.

[0037] Figure 4This figure illustrates yet another example of the bidirectional driver according to this embodiment. Figure 4 In the bidirectional driver shown (hereinafter referred to as driver 300), two second movable magnetic yokes 302a and 302b are arranged adjacent to each other on the opposite sides of the surfaces of the two magnets (upper magnet 132a and lower magnet 132b) that are opposite to the surfaces of the movable magnetic yoke 134. This structure reduces the air gap in the magnetic path and improves the aforementioned effect.

[0038] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is obviously not limited to these examples. Clearly, those skilled in the art will be able to conceive of various modifications or variations within the scope of the claims, and these also fall within the technical scope of the present invention.

[0039] Industrial availability

[0040] This invention can be used as a driver capable of actively moving a shaft in both directions.

Claims

1. A bidirectional driver, characterized in that, This bidirectional driver has the following features: A coil, which is wound into a cylindrical shape; A fixed magnetic yoke, which covers the coil; and A movable element that moves bidirectionally along the axial direction of the coil from the inside of the fixed yoke. The inner circumferential surface of the fixed magnetic yoke has a circumferential slit. In the movable member, two magnets with opposing magnetic poles are arranged along the axial direction, and a movable magnetic yoke with a flange protruding between the two magnets is arranged. The flange of the movable magnetic yoke is configured to be inserted into the slits of the fixed magnetic yoke. When the coil is in a de-energized state, the flange of the movable yoke is attracted to and held on the fixed yoke at the upper or lower part of the slit.

2. The bidirectional driver according to claim 1, characterized in that, A second movable magnetic yoke is provided on the outer side of each of the two magnets, centered on the movable magnetic yoke that protrudes in the shape of the flange.

Images