JP5345047B2 - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-axis linear motor that has a simple configuration and achieves a reduction in size. <P>SOLUTION: The linear motor 1 includes: a stator 2; and each mover 3 arranged on the stator 2 so as to be drivable in a prescribed direction. The plurality of movers 3 are arranged on one surface of the stator 2. In the linear motor 1, the plurality of movers 3 are arranged on the single stator 2 so as to be mutually independently drivable while aligning the drive direction in parallel to each other. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a linear motor, and more particularly to a multi-axis linear motor that has a simple configuration and can be miniaturized.

  In recent years, linear motors having a plurality of axes have been adopted. A conventional multi-axis linear motor includes, for example, a stator configured by arranging a plurality of coils wound in a cylindrical shape in the axial direction on the inner diameter side of a metal pipe made of a cylindrical magnetic body, A cylindrical linear motor having a mover configured by arranging a plurality of magnets opposed to each other through an air gap in the axial direction is provided, and a plurality of the linear motors are arranged. As a conventional linear motor having such a configuration, a technique described in Patent Document 1 is known.

JP 2007-142359 A

  However, in the conventional linear motor, since a plurality of motor units each composed of one mover and one stator are arranged in parallel, the assembly work of the linear motor takes a long time and the number of parts is large. There is a problem.

  In addition, since the stator is disposed on the outer diameter side of the mover, the distance between adjacent movers cannot be reduced below the thickness in the radial direction of the stator, and there is a problem that downsizing is difficult.

  Accordingly, the present invention has been made in view of the above, and an object thereof is to provide a multi-axis linear motor having a simple configuration and capable of being downsized.

  In order to achieve the above object, a linear motor according to the present invention is a linear motor including a stator and a mover disposed so as to be drivable in a predetermined direction with respect to the stator. Are arranged such that they can be driven independently of each other while the driving directions are aligned parallel to each other.

  In the linear motor according to the present invention, the plurality of movable elements are arranged so that they can be driven independently from each other while the driving directions are aligned parallel to each other with respect to the single stator. In such a configuration, there is an advantage that a linear motor having a plurality of axes can be easily configured as compared with a configuration in which a plurality of motor units each including a single mover and a single stator are arranged in parallel. In this linear motor, a plurality of movers are arranged on one surface of the stator. In such a configuration, since the stator is not positioned between adjacent movers, the arrangement interval of the movers can be narrowed. This has the advantage that the product can be miniaturized.

1 is a plan view showing a linear motor according to a first embodiment of the present invention. 2 is a cross-sectional view taken along line AA showing the linear motor shown in FIG. 3 is a cross-sectional view taken along the line B-B showing the linear motor shown in FIG. 1. FIG. 4 is a plan view showing a linear motor according to the second embodiment of the present invention. 5 is a cross-sectional view taken along the line CC of the linear motor illustrated in FIG. 6 is a cross-sectional view taken along the line DD showing the linear motor shown in FIG. FIG. 7 is a plan view showing a linear motor according to a third embodiment of the present invention. FIG. 8 is a cross-sectional view taken along line EE showing the linear motor described in FIG. 7. FIG. 9 is a cross-sectional view showing a modification of the linear motor shown in FIG.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. Further, the constituent elements of this embodiment include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

Embodiment 1.
1 is a plan view showing a linear motor according to a first embodiment of the present invention. 2 and 3 are an AA sectional view (FIG. 2) and a BB sectional view (FIG. 3) showing the linear motor shown in FIG.

[Linear motor]
The linear motor 1 is a linear motor having a plurality of axes, and is applied to, for example, a head portion of a chip mounter (see FIGS. 1 to 3). The linear motor 1 includes a stator 2, a plurality of movers 3, and a guide portion 4. The stator 2 is composed of, for example, a plurality of magnets (not shown) arranged, and constitutes the secondary side of the linear motor 1. The stator 2 is fixed by being attached to the base 10. The mover 3 is made of a coil, for example, and constitutes the primary side of the linear motor 1. The mover 3 is disposed to face the magnetic pole surface 21 of the stator 2. Further, the mover 3 can be slid in a predetermined direction with respect to the stator 2. A plurality of movers 3 are arranged with respect to one stator 2. At this time, these movable elements 3 are arranged so that their driving directions are aligned parallel to each other, and are arranged so as to be driven independently of each other. The guide unit 4 is a means for guiding the driving direction (sliding direction) of the mover 3 and is connected to the mover 3.

  In this linear motor 1, when a current is applied to the mover 3 from an external control device (not shown), Lorentz force acts on the mover 3 by a magnetic field formed by the stator 2. Then, the mover 3 slides in a predetermined direction with respect to the stator 2. As a result, the linear motor 1 is driven, and the displacement of the mover 3 is output to the outside via the guide portion 4. Further, by controlling the current to each movable element 3, each movable element 3 is driven and controlled independently of each other (multi-axis linear motor).

[Specific structure of stator and mover]
For example, in the first embodiment, a multi-axis linear motor 1 is configured as follows (see FIGS. 1 to 3). First, the stator 2 is composed of a plurality of magnets (not shown). Specifically, the stator 2 having the planar magnetic pole surface 21 is configured by arranging a plurality of magnets in the driving direction of the linear motor while alternately inverting the magnetic poles. The stator 2 has a rectangular plate-like structure. The stator 2 is fixed by screwing to a base 10 made of a long plate-like member. At this time, the stator 2 is arranged so that the magnetic pole surface 21 of the stator 2 is positioned at the center of the flat portion of the base 10. Therefore, both end portions of the base 10 protrude from the both sides of the magnetic pole surface 21 of the stator 2 in the driving direction of the linear motor (magnet arrangement direction). Further, guide rails 11 are laid on both ends of the pedestal 10, respectively. Thereby, a pair of guide rails 11 and 11 are arrange | positioned at the both sides of the drive direction of a linear motor with the stator 2. As shown in FIG. Moreover, these guide rails 11 and 11 are extended in the drive direction of a linear motor.

  Moreover, the needle | mover 3 is comprised by the coil formed by winding in a square. The guide unit 4 includes a frame 41 and a pair of guide blocks 42 and 42. The frame 41 has a long U-shape with both ends bent. The guide block 42 is a block portion that engages with the guide rail 11 of the stator 2, and is fixed to an end portion of the frame 41. The movable element 3 is fixed and supported on the inner side of the middle part of the frame 41, whereby the movable element 3 and the guide part 4 are connected and integrated. And the guide part 4 which has this needle | mover 3 is attached with respect to the base 10. FIG. At this time, the mover 3 is arranged with its axial direction (longitudinal direction of the frame 41) directed to the driving direction of the linear motor. Further, the mover 3 is disposed to face the magnetic pole surface 21 of the stator 2 with a gap between the mover 3 and the stator 2. Further, the guide blocks 42 and 42 of the guide portion 4 are engaged with the guide rails 11 and 11 of the base 10, respectively. Thereby, the mover 3 is configured to slide and move along the guide rail 11 so as to reciprocate in the driving direction of the linear motor.

  In addition, three movable elements 3 are arranged for one stator 2. Further, these movers 3 are arranged on the magnetic pole surface 21 of the stator 2 at predetermined intervals while aligning the driving directions in parallel with each other. Further, these movers 3 can slide in the driving direction of the linear motor independently of each other. In addition, these movable elements 3 are respectively connected to an external control device (not shown), so that drive control can be performed independently of each other. Thus, a multi-axis linear motor 1 is configured.

  In the first embodiment, three movers 3 are installed on one stator 2 (see FIG. 1). However, the present invention is not limited to this, and four or more movable elements 3 may be installed on one stator 2 (not shown).

[effect]
As described above, in the linear motor 1, the plurality of movable elements 3 are arranged so as to be able to be driven independently from each other while the driving directions are aligned parallel to each other with respect to the single stator 2 (FIG. 1). To FIG. 3). In such a configuration, there is an advantage that a linear motor having a plurality of axes can be easily configured as compared with a configuration in which a plurality of motor units each including a single mover and a single stator are arranged in parallel. Thereby, the assembly time of a product is shortened and the number of parts is reduced.

  Moreover, in this linear motor 1, the some needle | mover 3 is arrange | positioned on one surface (for example, one side of the stator which has a planar structure) of the stator 2 (refer FIG. 1 and FIG. 2). In such a configuration, since the stator 2 is not positioned between the adjacent movable elements 3 and 3, the arrangement interval of the movable elements 3 can be narrowed. This has the advantage that the product can be miniaturized.

  Further, the linear motor 1 includes a guide portion 4 that regulates the driving direction of the mover 3. The guide portion 4 holds the mover 3 and drives the mover 3 with respect to the stator 2. (See FIGS. 1 and 3). With such a configuration, there is an advantage that the driving direction of the mover 3 is appropriately regulated with a simple configuration.

Embodiment 2.
FIG. 4 is a plan view showing a linear motor according to the second embodiment of the present invention. 5 and 6 are a CC cross-sectional view (FIG. 5) and a DD cross-sectional view (FIG. 6) showing the linear motor shown in FIG. In these drawings, the same components as those of the linear motor 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the linear motor 1 of Embodiment 1 described above, a plurality of movers 3 are arranged with respect to a single stator 2 (see FIGS. 1 to 3). On the other hand, in the linear motor 1 according to the second embodiment, a plurality of movers 3 are disposed between a pair of stators 2 and 2 (see FIGS. 4 to 6). That is, the plurality of movable elements 3 are arranged so as to be sandwiched between the pair of stators 2 and 2 and arranged so that they can be driven independently from each other while the driving directions are aligned in parallel with each other. In such a configuration, the magnetic field for driving the mover 3 is enhanced by the pair of stators 2 and 2 as compared to a configuration including a single stator. Thereby, there exists an advantage which the performance of the linear motor 1 improves.

  For example, in the second embodiment, the pair of stators 2 and 2 are arranged with the magnetic pole surfaces 21 facing each other (see FIGS. 4 to 6). Further, fastening plates 22 are sandwiched between both ends of the stators 2 and 2, respectively, and the interval between the opposing stators 2 and 2 is secured by the fastening plates 22 and 22. In addition, the base 10 is abbreviate | omitted in FIGS.

  Further, the guide portion 4 is constituted by a shaft 43 and a pair of guides 44 and 44. The shaft 43 is a long rod-shaped member made of a magnetic material. The pair of guides 44 are bearings that hold the shaft 43 slidably in the axial direction. The guide 44 is sandwiched and held by the end portions (end portions in the drive direction of the linear motor) of the pair of stators 2 and 2 via the guide holder 45. Further, guides 44 are disposed at both ends of the stator 2.

  Further, the shaft 43 and the mover 3 are integrated by inserting the shaft 43 of the guide portion 4 into the mover 3 and holding the mover 3. The shaft 43 is held by a pair of guides 44 so as to be slidable in the axial direction. At this time, the axial direction of the shaft 43 is set so that the axial direction of the mover 3 faces the driving direction of the linear motor. Thereby, the needle | mover 3 is arrange | positioned so that a slide displacement is possible in the drive direction of a linear motor. Further, the mover 3 is disposed to face the magnetic pole surface 21 of each stator 2, 2 with a gap between each stator 2, 2.

  Three movable elements 3 are arranged between the pair of stators 2 and 2. Further, these movers 3 are arranged on the magnetic pole surface 21 of the stator 2 at predetermined intervals while aligning the driving directions in parallel with each other. Further, these movers 3 (shafts 43) are arranged at equal distances from the magnetic pole surfaces 21 and 21 of the respective stators 2 and 2. Further, these movers 3 can slide in the driving direction of the linear motor independently of each other. In addition, these movable elements 3 are respectively connected to an external control device (not shown), so that drive control can be performed independently of each other. Thus, a multi-axis linear motor 1 is configured.

  In the second embodiment, three movable elements 3 are installed between the pair of stators 2 and 2 (see FIG. 4). However, not limited to this, four or more movable elements 3 may be installed between the pair of stators 2 and 2 (not shown).

Embodiment 3.
FIG. 7 is a plan view showing a linear motor according to a third embodiment of the present invention. FIG. 8 is a cross-sectional view taken along line EE showing the linear motor described in FIG. 7. FIG. 9 is a cross-sectional view showing a modification of the linear motor shown in FIG. In these drawings, the same components as those of the linear motor 1 of the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  In the linear motor 1 of the third embodiment, the magnetic body 5 is disposed between the adjacent movers 3 and 3 (see FIGS. 7 and 8). In such a configuration, the magnetic body 5 functions as a shielding member for suppressing mutual induction between the adjacent movable elements 3 and 3. Thereby, there exists an advantage by which the independent and appropriate drive control of each needle | mover 3 and 3 is ensured. In particular, in such a configuration, the interval between the adjacent movers 3 and 3 can be narrowed compared to a configuration in which no magnetic body is disposed between the movers. This has an advantage that the linear motor 1 can be further reduced in size (see FIG. 9).

  For example, in this Embodiment 3, the magnetic body 5 is comprised with the plate-shaped member made from iron. Moreover, the magnetic body 5 is arrange | positioned 1 each between the three needle | movers 3, and the space between the adjacent needle | movers 3 and 3 is partitioned off. Further, the magnetic bodies 5 and 5 are held by a pair of stators 2 and 2. Thereby, mutual induction between the adjacent movable elements 3 and 3 is suppressed by the magnetic body 5.

  As described above, the linear motor according to the present invention is useful in that it has a simple configuration and can form a plurality of shafts that can be miniaturized.

DESCRIPTION OF SYMBOLS 1 Linear motor, 2 Stator, 21 Magnetic pole surface, 22 Fastening plate, 3 Mover, 4 Guide part, 41 Frame, 42 Guide block, 43 Shaft, 44 Guide, 45 Guide holder, 5 Magnetic body, 10 Base, 11 Guide rail

Claims (2)

A stator,
A mover arranged to be drivable in a predetermined direction with respect to the stator ;
A guide rail extending in a direction along the driving direction of the mover and laid on both sides of the stator along the driving direction;
The drive direction of the mover is provided so as to straddle the stator in the drive direction, engages with the guide rail so as to be slidable in the drive direction, and holds the mover on a surface facing the stator. A guide portion for restricting in a predetermined direction,
A plurality of the guide rails and the guide portions are arranged in a direction perpendicular to the driving direction with respect to the single stator, so that the movable elements held by the respective guide portions are fixed to each other. A linear motor characterized in that it is arranged so that it can be driven independently of each other on one surface of the child while aligning the driving directions in parallel with each other. The linear motor according to claim 1, wherein a magnetic body is disposed between the adjacent movers.

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