JP2007185054A - Actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an actuator employing a linear motor, capable of attaining improvement of operating efficiency by facilitating positioning of a stator without causing complexity of configuration, enlargement and a cost increase of the actuator. <P>SOLUTION: This actuator includes; the linear motor provided with the stator laminated and arranged with a plurality of permanent magnets and extended in a shaft-like manner and a moving element having a coil movably provided on a peripheral side of the stator; and a pair of stator support portions supporting both ends of the stator. At least at either one side of this one pair of stator support portions, the stator is constructed so as to be movably supported in a direct or indirect manner by means of a thread structure and so as to be fixed at an optional position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an actuator using a linear motor used in a precision positioning system, for example, and in particular, by improving the configuration of the stator positioning mechanism, the stator positioning operation can be facilitated. It relates to something that was devised.

  A linear motor capable of non-contact driving is suitable as a driving mechanism for a precision positioning device, for example. Conventional linear motors and actuators using such linear motors are configured as shown in FIGS. 22 and 23, for example.

  FIG. 22 is a cross-sectional view showing the configuration of the linear motor 701, and the linear motor 701 includes a stator 703 and a mover 705. The stator 703 is installed on the outer peripheral side of the nonmagnetic center shaft 707, a plurality of ring-shaped permanent magnets 709 stacked and arranged on the outer periphery of the nonmagnetic center shaft 707, and the plurality of permanent magnets 709. A pair of the non-magnetic thin-walled pipe 711 and the non-magnetic thin-walled pipe 711 that are screwed into the non-magnetic center shaft 707 at positions on both sides of the plurality of permanent magnets 709 and partially inserted into the non-magnetic thin-walled pipe 711. End caps 713 and 713.

  The mover 705 includes a coil case 715 and a coil portion 717 accommodated and disposed in the coil case 715.

As shown in FIG. 23, the stator 703 is supported at both ends by support members 719 and 719. The movable element 705 is moved in the left-right direction (arrow a direction) in the figure while being guided by the linear motion guide mechanism 721. The linear guide mechanism 721 includes a pair of guide rails 723 and 723 (shown only on one side in FIG. 23) and guide members 725 and 725 (in FIG. 23, two on one side) that are movably engaged with the respective guide rails 723 and 723. (Only shown).
In some cases, the guide rail is constituted by one guide rail.

  For example, Patent Document 1 discloses a configuration of a linear motor of the same type.

Japanese Patent Laid-Open No. 10-313566

Incidentally, in the case of an actuator using this type of linear motor 701, it is necessary to adjust and set the origin position of the stator 703 of the linear motor 701. That is, it is necessary to adjust and set the stator 703 of the linear motor 701 at a predetermined position in the axial direction of the actuator.

  Specifically, the positioning was performed according to the procedure shown in FIGS. First, as shown in FIG. 24, the end portion of the stator 703 is inserted into the through hole 719 a of the support member 719. This is done similarly on the left and right sides. Next, a current is passed through the coil portion 717 of the mover 705. Thereby, the mover 705 moves and stops at an arbitrary position. The origin of the stator 703 is adjusted / set using the position as a guide. Specifically, the worker moves the stator 703 in the left-right direction by manual work to position it at a desired position. When the position of the stator 703 is adjusted and set, as shown in FIG. 25, the fixing screw member 731 is screwed and fixed to the female screw portion 733 provided on the support member 719.

  There are also configurations as shown in FIGS. In this case, the support member 719 is provided with a split 735, and the other configurations are the same as those shown in FIGS. Further, the position of the stator 703 is adjusted and set by the same procedure as described above.

The conventional configuration has the following problems.
That is, in the conventional case, it is necessary to adjust and set the position of the stator 703 while the operator moves it directly by hand, which necessitates complicated work and takes a long time. There was a problem that work efficiency was bad.
For such a problem, for example, it may be possible to use a motor driver with a magnetic pole detection function, which eliminates the need to place a fixed magnetic pole at a predetermined position in the axial direction of the actuator. The position can be the origin. However, there is a problem that the control for that purpose becomes complicated. Also, the motor driver with the magnetic pole detection function is not cheap.
In addition, when the motor driver with the magnetic pole detection function is used, it is necessary to perform a magnetic pole detection operation (so-called pole sensing) in the first operation after turning on the power, so that it cannot be used immediately after turning on the power. There was a problem.
In addition to using the motor driver with the magnetic pole detection function, for example, there is a method using a linear absolute encoder. In this case, the position is detected by a linear absolute encoder, thereby determining the magnetic pole position. In this case, however, the control is complicated and the linear absolute encoder is very expensive.

  The present invention has been made based on such points, and the object of the present invention is to facilitate the positioning of the stator without complicating the configuration, increasing the size of the apparatus, and increasing the cost. An object of the present invention is to provide an actuator that employs a linear motor capable of improving efficiency.

In order to solve the above-mentioned conventional problems, the actuator according to claim 1 of the present invention is formed by laminating and arranging a plurality of permanent magnets, and is movable to the outer peripheral side of the stator, which is extended in a shaft shape. An actuator including a linear motor provided with a mover provided with a coil and a pair of stator support portions that respectively support both ends of the stator. It is characterized in that at least one of the stators is movably supported directly or indirectly using a screwing structure and can be fixed at an arbitrary position.
The actuator according to claim 2 is the actuator according to claim 1, wherein the stator support portion includes a support member having a through-hole into which an end portion of the stator is inserted and arranged, and an end of the stator. A female screw part provided directly or indirectly on the part side, and a male screw member screwed into the female screw part from the opposite side of the stator across the support member, the male screw member being the above The stator is moved by being screwed into the female screw portion.
The actuator according to claim 3 is the actuator according to claim 1, wherein the stator support portion includes a support member having a through-hole into which an end portion of the stator is inserted and arranged, and an end of the stator. A male screw part provided directly or indirectly on the part, and a female screw member screwed to the male screw part from the opposite side of the stator across the support member, the female screw member being the male screw The stator is moved by being screwed to the portion.
The actuator according to claim 4 is the actuator according to claim 2 or 3, wherein a fixing screw member is screwed to the support member, and the position of the actuator is adjusted and set by moving the stator. After that, the fixing screw member is screwed together to fix the stator.
According to a fifth aspect of the present invention, in the actuator according to the first aspect, the stator support portion includes a through-hole into which an end portion of the stator is inserted and arranged, and is movable and can be moved to an arbitrary position. The support member is provided so as to be fixable, a bracket installed on the opposite side of the stator with the support member interposed therebetween, and a screwing member screwed into the support member via the bracket. The support member and thus the stator are moved by screwing the screw member in an appropriate direction.

  As described above, according to the actuator of the present invention, a plurality of permanent magnets are stacked and arranged, and the stator is extended in the shape of a shaft, and the coil is provided movably on the outer peripheral side of the stator. In an actuator comprising a linear motor comprising a movable element and a pair of stator support portions that respectively support both ends of the stator, a screwing structure is provided in at least one of the pair of stator support portions. The stator is movably supported directly or indirectly and is configured to be fixed at an arbitrary position, so that the positioning operation of the stator can be performed without increasing the complexity of the configuration and increasing the cost. It can be simplified and work efficiency can be improved.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view showing a configuration of an actuator according to the present embodiment. First, there is a linear motor 1, and the linear motor 1 includes a stator 3 and a mover 5. The stator 3 is installed on a nonmagnetic center shaft 7, a plurality of ring-shaped permanent magnets 9 stacked and arranged on the outer periphery of the nonmagnetic center shaft 7, and on the outer peripheral side of the plurality of permanent magnets 9. A pair of the non-magnetic thin-walled pipe 11 and a plurality of permanent magnets 9 that are screwed into the non-magnetic center shaft 7 at positions on both sides of the plurality of permanent magnets 9 and partially inserted and arranged in the non-magnetic thin-wall pipe 11 End caps 13 and 13.

  The movable element 5 includes a coil case 15 and a coil portion 17 accommodated and disposed in the coil case 15.

Both ends of the stator 3 are supported by stator support portions 19 and 19, respectively. Further, the movable element 5 moves in the left-right direction (arrow a direction) in FIG. 1 while being guided by the linear motion guide mechanism 21. The linear guide mechanism 21 includes a pair of guide rails 23 and 23 (shown only on one side in FIG. 1) and guide members 25 and 25 (2 on one side in FIG. 1) movably engaged with the respective guide rails 23 and 23. (Only shown).
In some cases, the guide rail is constituted by one guide rail.

Next, the configuration of the stator support portion 19 will be described in detail. As shown in FIGS. 1 to 5, the stator support portion 19 includes a support member 27. The support member 27 has an inverted T shape as shown in FIGS. 2 to 4, and has a bottom plate portion. 27a and a standing portion 27b. The bottom plate portion 27a has through-holes 29, 29 for attachment / fixation, and is fixed by screwing the through-holes 29, 29 through a fixing bolt (not shown) to a grounding portion.
The shape of the support member 27 is not particularly limited, and the bottom plate portion 27a has a female screw for mounting and fixing, and is fixed by being screwed to a grounding portion through a fixing bolt (not shown).

The standing portion 27b includes splits 31 and 33, and the block portion 35 is provided in a displaceable manner through the splits 31 and 33. Further, as shown in FIG. 5, a stepped through hole 37 is formed in the standing portion 27b. As shown in FIG. 5B, the stepped through hole 37 is composed of a large diameter hole 37a and a small diameter hole 37b. The end cap 13 portion of the stator 3 is inserted and disposed in the large diameter hole 37 a of the stepped through hole 37.

Further, as shown in FIG. 2, the end cap 13 is formed with a female screw portion 39. On the other hand, a screw member 41 is disposed on the opposite side of the stator 3 with the support member 27 interposed therebetween. The screw member 41 is of a type rotated by a hexagon wrench (not shown). The end cap 13 of the stator 3 is inserted and arranged in the large-diameter hole 37a of the through-hole 37, and in this state, the screw member 41 is inserted from the opposite side and screwed into the female screw portion 39. Then, by screwing the screw member 41, the stator 3 is pulled to move its position and adjusted / set to a desired position.

A fixing screw member 43 is screwed into the block portion 35 of the support member 27. The fixing screw member 43 is for fixing the position of the stator 3 whose position has been adjusted.
In addition, although the structure of one stator support part 19 among the already described stator support parts 19 and 19 has been described, the other stator support part 19 has the same structure.

The adjustment / setting of the position of the stator 3 will be described based on the above configuration.
First, the end caps 13 and 13 at both ends of the stator 3 are inserted and arranged in the large-diameter holes 37a and 37a of the through holes 37 and 37 of the support members 27 and 27 of the stator support portions 19 and 19, respectively. FIG. 1 shows this state.

Next, a current is passed through the coil portion 17 of the mover 5 in this state. Thereby, the mover 5 moves and stops at an arbitrary position. From this state, the origin of the stator 3 is detected, and the stator 3 is moved to the origin position and set.
For example, in FIG. 1, when it is desired to move the stator 3 to the left side in the drawing, the screw member 41 is screwed into the female screw portion 39 of the stator 3 as shown in FIGS. Then, as shown in FIG. 3, the screw member 41 is screwed in a state where the head of the screw member 41 is in contact with the standing portion 27 b of the support member 27. As a result, the stator 3 is pulled and moved to the left in the figure. At that time, the right side is free.

On the contrary, in FIG. 1, when the stator 3 is to be moved to the right side in the drawing, the screw member 41 is screwed into the female screw portion 39 of the stator 3 on the right side. Then, the screw member 41 is screwed in a state where the head of the screw member 41 is in contact with the standing portion 27 b of the support member 27. Thereby, the stator 3 is pulled and moved to the right side in the figure. At that time, the left is in a free state.

By performing such operations, the stator 3 is positioned at a desired position. After the positioning of the stator 3 is completed, the fixing screw members 43 are respectively screwed in the left and right stator support portions 19 and 19 to fix the stator 3.

As described above, according to the present embodiment, the following effects can be obtained.
First, the positioning operation of the stator 3 is facilitated. In contrast to the conventional method in which the worker moves the stator 3 while directly holding the stator 3 by hand, in the case of this embodiment, the screw member 41 can be rotated. It is because it constituted.
Further, since the stator 3 is moved by rotating the screw member 41, the fine adjustment is facilitated, whereby the stator 3 can be easily and quickly positioned at a desired position. Is now possible. And the efficiency of the positioning operation | work of the stator 3 can be aimed at.
In the case of this embodiment, since the same position adjustment mechanism is used in the left and right stator support portions 19 and 19, for example, the left position adjustment mechanism is used to move the stator 3 to the left in the figure. If too much is used, the position adjustment mechanism on the right side may be used to return to the right side, which makes position adjustment / setting work easier.
still,
A configuration in which the position adjustment mechanism is provided only on either the left or right side is also conceivable.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the case of this second embodiment, a male screw portion 101 is provided on the end cap 13 of the stator 3, while a nut 103 as a female screw member is arranged on the opposite side of the stator 3 with the support member 27 interposed therebetween. The stator 3 is moved by screwing the nut 103 into the male screw portion 101.
Other configurations are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals and description thereof is omitted.
Therefore, the same operation and effect as in the case of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIGS. In the case of this embodiment, the internal thread portion 201 is provided in the small diameter hole 37 b of the through hole 37 of the standing portion 27 a of the support member 27. The stator 3 is pushed out by screwing a bolt 41 there. That is, in the case of the first and second embodiments, the position is adjusted by pulling the stator 3, but in the case of the third embodiment, this is pushed. The position is adjusted accordingly.
Other configurations are the same as those in the first and second embodiments, and the same portions are denoted by the same reference numerals and description thereof is omitted.
Therefore, the same operation and effect as in the first and second embodiments can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. In this case, a stator position adjusting member 301 is disposed between the support member 27 and the stator 3. A hole 303 is formed in the stator position adjusting member 301, and the end cap 13 of the stator 3 is inserted and disposed in the hole 303, and is fixed by screwing a fixing screw member 305. A male screw portion 307 protrudes and is disposed on the stator position adjusting member 301. Further, the stator position adjusting member 301 is formed with splits 309 and 311, and a block portion 313 is provided through the splits 309 and 311.

On the other hand, a nut 315 as a female screw member is disposed on the opposite side of the stator position adjusting member 301 with the support member 27 interposed therebetween. Further, the large-diameter hole 37a of the through hole 37 of the support member 27 is configured to have such a size that the stator position adjusting member 301 is inserted and arranged.
In addition, the same reference numerals are given to the same parts as those of the above-described embodiments, and the description thereof is omitted.

The operation will be described based on the above configuration.
First, the stator 3 is inserted and fixed to the stator position adjusting member 301. That is, the end cap 13 of the stator 3 is inserted and arranged in the hole 303 and fixed by screwing the fixing screw member 305.
Next, the stator position adjusting member 301 is inserted into the large diameter hole 37 a of the through hole 37 of the support member 27. Thereafter, the nut 315 is screwed into the male threaded portion 307, whereby the stator position adjusting member 301 and then the stator 3 are pulled to adjust and set the position.

Therefore, the same effects as those of the first to third embodiments can be obtained.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. In the case of this embodiment, in the fourth embodiment, the female screw portion 401 is provided on the stator position adjusting member 301 side, the screw member 403 is disposed on the opposite side across the support member 27, and the screw member By screwing 403 into the female thread portion 401, the stator position adjusting member 301 and then the stator 3 are pulled to adjust its position.
Other configurations are the same as those of the fourth embodiment, and the same portions are denoted by the same reference numerals and description thereof is omitted.
Therefore, the same operation and effect as in the case of the fourth embodiment can be obtained.

Next, a sixth embodiment of the present invention will be described with reference to FIGS. In the case of this embodiment, the support member 27 of the stator support portion 19 is configured to be movable, and another bracket 501 is installed and fixed on the outside thereof. A through hole 503 is formed in the bracket 501, and a female screw portion 505 is provided on the support member 27 side. Then, the screw member 507 is screwed into the female screw portion 505 through the through hole 503, whereby the support member 27 and then the stator 3 are pulled to adjust and set the position.

Other configurations are the same as those in the first to fifth embodiments, and the same portions are denoted by the same reference numerals and description thereof is omitted.
Therefore, the same actions and effects as those in the above embodiments can be obtained.

The present invention is not limited to the first to sixth embodiments. In short, it is sufficient that at least one end of the stator is supported directly or indirectly by a screwing structure, and the position can be adjusted and set by moving the stator using the screwing structure.
Further, in the first to sixth embodiments, the left and right stator support portions 19 and 19 have the same configuration, but only the left or right may be configured to be position adjustable.
In addition, the other configurations shown are merely examples and are not limited thereto.

The present invention relates to an actuator that employs a linear motor, and more particularly to an actuator devised so as to facilitate the positioning operation of the stator by improving the configuration of the stator positioning mechanism. It is suitable for an actuator used in a system for positioning.

It is a figure which shows the 1st Embodiment of this invention and is a sectional side view which shows the structure of an actuator. It is a figure which shows the 1st Embodiment of this invention and is a disassembled perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 1st Embodiment of this invention and is a perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 1st Embodiment of this invention and is a disassembled perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. FIGS. 5A and 5B are views showing a first embodiment of the present invention, FIG. 5A is a side view showing the configuration of a support member and the like that support a stator of a linear motor, and FIG. 5B is a view of FIG. It is bb sectional drawing. It is a figure which shows the 2nd Embodiment of this invention, and is a disassembled perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 2nd Embodiment of this invention, and is a perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 2nd Embodiment of this invention, and is a disassembled perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 3rd Embodiment of this invention, and is a disassembled perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 3rd Embodiment of this invention, and is a perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 3rd Embodiment of this invention, and is a disassembled perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 4th Embodiment of this invention, and is a disassembled perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 4th Embodiment of this invention, and is a perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 4th Embodiment of this invention, and is a disassembled perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 5th Embodiment of this invention, and is an exploded perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 5th Embodiment of this invention, and is a perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 5th Embodiment of this invention, and is an exploded perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 5th Embodiment of this invention, and is an exploded perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 6th Embodiment of this invention, and is an exploded perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 6th Embodiment of this invention, and is a perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows the 6th Embodiment of this invention, and is an exploded perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows a prior art example, and is a sectional side view which shows the structure of a linear motor. It is a figure which shows a prior art example, and is a sectional side view which shows the structure of an actuator. It is a figure which shows a prior art example, and is an exploded perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows a prior art example, and is a perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows a prior art example, and is an exploded perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor. It is a figure which shows a prior art example, and is a perspective view for demonstrating sequentially the positioning operation | work of the stator of a linear motor.

Explanation of symbols

1 linear motor 3 stator 5 mover 7 nonmagnetic center shaft 9 permanent magnet 11 nonmagnetic thin-walled pipe 11
13 End cap 15 Coil case 17 Coil part 19 Stator support part 27 Support member 39 Female thread part 41 Screw member 43 Fixed screw member

Claims (5)

A linear motor comprising a stator that is formed by laminating and arranging a plurality of permanent magnets and extended in the shape of a shaft; and a mover having a coil that is movably installed on the outer periphery of the stator. ,
A pair of stator support portions for supporting both ends of the stator, and
In an actuator with
An actuator characterized in that at least one of the pair of stator support portions supports the stator movably directly or indirectly using a screwing structure and can be fixed at an arbitrary position. . The actuator according to claim 1, wherein
The stator support portion includes a support member having a through hole into which an end portion of the stator is inserted and arranged, a female screw portion provided directly or indirectly on the end portion side of the stator, and the support member And a male screw member that is screwed into the female screw portion from the opposite side of the stator, and the stator is moved by screwing the male screw member into the female screw portion. An actuator characterized by. The actuator according to claim 1, wherein
The stator support portion includes a support member having a through-hole into which an end portion of the stator is inserted and arranged, a male screw portion provided directly or indirectly at the end portion of the stator, and the support member. A female screw member that is screwed into the male screw portion from the opposite side of the stator, and the stator is moved by screwing the female screw member into the male screw portion. Characteristic actuator. The actuator according to claim 2 or claim 3,
A fixing screw member is screwed onto the support member, and the stator is fixed by moving the stator and adjusting and setting the position thereof, and then screwing the fixing screw member. An actuator characterized by. The actuator according to claim 1, wherein
The stator support portion includes a support member provided with a through-hole into which an end portion of the stator is inserted and arranged, and is movable and can be fixed at an arbitrary position. A bracket installed on the opposite side of the child, and a screwing member screwed to the support member via the bracket, and supported by screwing the screwing member in an appropriate direction. An actuator characterized by moving a member and by extension a stator.

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