JP2005124256A - Stator of linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a linear motor capable of moving a moving member accurately to a specified position. <P>SOLUTION: The stator 12 comprises a plurality of cylindrical magnets 14 arranged to join in the axial direction while facing the same magnetic poles each other, a supporting rod 16 penetrating the center of the plurality of cylindrical magnets 14, and a tubular case 17 fitted over the series of magnets 14. The series of magnets 14 are clamped by a clamping structure 18 between the opposite end parts of the supporting rod 16 in the tubular case 17. Opposite end parts of the tubular case 17 are secured to the frame 11 by a securing structure 23 integrally with the opposite end parts of the supporting rod 16. Position of the opposite end parts of the supporting rod 16 and the tubular case 17 is regulated by a regulating structure 30 not to be shifted outward in the axial direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stator of a linear motor, and more particularly to an improvement in a support structure for a stator with respect to a frame.

  Conventionally, as a stator of this type of linear motor, for example, a configuration as shown in FIGS. 4 to 6 is known. That is, in this conventional configuration, a stator 42 is supported at both ends between a pair of left and right support portions 41A and 41B of the frame 41, and a mover 43 having a coil built in the outer periphery of the stator 42 in the axial direction. It is inserted and supported so as to be movable. In this specification, left and right refer to the left and right in the drawing. The stator 42 includes a plurality of cylindrical magnets 44 joined and arranged in the axial direction so that the same magnetic poles face each other, a cylindrical spacer 45 joined and arranged at both ends of the magnets 44, and a magnet A support rod 46 inserted into the center of the 44 series and the spacer 45 and a cylindrical case 47 fitted on the outer periphery of the series of the magnet 44 and the spacer 45 are provided.

  As shown in FIGS. 4 and 5, a support hole 41a is formed in the right support portion 41A of the frame 41, and a fixing member 48 is fitted into the support hole 41a via a support cylinder 49 so that a plurality of support holes 41a are inserted. It is fixed with the screw 50. Then, the right end portion of the cylindrical case 47 is welded and fixed to the outer periphery of the fixing member 48, and the right end screw portion 46a of the support rod 46 is screwed into the center of the inner end of the fixing member 48. 47 and the right end portion of the support rod 46 are integrally fixed to the right support portion 41 </ b> A of the frame 41.

  As shown in FIGS. 4 and 6, inside the left end of the cylindrical case 47, a cylindrical clamping nut 51 and a locking nut 52 are screwed into the left end screw portion 46 b of the support rod 46. By tightening these nuts 51 and 52, a plurality of magnets 44 are held between both end portions of the support rod 46 via the spacer 45. A support hole 41b is formed in the left support part 41B of the frame 41, and a clamping nut 51 is inserted directly into the support hole 41b via the support cylinder 49 or the like. A fixing nut 53 is screwed onto the outer peripheral threaded portion 51 a of the clamping nut 51, and the left end portion of the support rod 46 is fixed to the left supporting portion 41 </ b> B of the frame 41 through the clamping nut 51 by tightening the fixing nut 53. Has been.

  However, in this conventional linear motor stator, although the right end portion side of the cylindrical case 47 is fixed to the right support portion 41A of the frame 41 via the fixing member 48, the left end side of the cylindrical case 47 is clamped. The nut 51 is only fitted on the outer periphery. For this reason, when the mover 43 is moved in the axial direction on the stator 42 and stopped at a position corresponding to a predetermined series of magnets 44, if the movement reaction force acts on the magnet, the support rod 46 and The cylindrical case 47 is moved separately in the axial direction at the end. Accordingly, the support rod 46 and the cylindrical case 47 are each independently subjected to a load as independent parts. As a result, the stator of the conventional linear motor has a problem that the rigidity is poor and the position accuracy of the mover 43 cannot be kept high.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a linear motor stator that can accurately move the mover to a predetermined position.

  In order to achieve the above object, the invention described in claim 1 is characterized in that a plurality of cylindrical magnets joined and arranged in the axial direction so that the same magnetic poles face each other, and the centers of the plurality of magnets are inserted. A supporting rod, a cylindrical case fitted on the outer periphery of the plurality of magnets, and a clamping means for clamping and holding the plurality of magnets between both ends of the supporting rod in the cylindrical case; Fixing means for fixing both ends of the cylindrical case to the frame integrally with both ends of the support rod, and position restriction so that the support rod and both ends of the cylindrical case do not move outward in the axial direction. And a restricting means.

(Function)
In the first aspect of the present invention, both end portions of the cylindrical case are integrally fixed to both ends of the support rod with respect to the frame. At the same time, the positions of the support rod and the cylindrical case are restricted so that they do not move outward in the axial direction. Therefore, when the mover is moved in the axial direction on the stator and stopped at a position corresponding to the predetermined magnet, the support rod and the cylindrical case are end portions even if the reaction force acts on the magnet. In this case, there is no fear of being moved separately in the axial direction, and the rigidity of the stator can be increased.

  As described above, according to the present invention, it is possible to provide a high-precision linear motor stator that can accurately move the mover to a predetermined position.

Below, one Embodiment of this invention is described based on FIGS. 1-3.
As shown in FIG. 1, between a pair of support portions 11A and 11B of a frame 11, a linear motor stator 12 is supported at both ends thereof. A mover 13 is fitted and supported on the outer periphery of the stator 12 so as to be reciprocally movable in the axial direction of the stator 12, and a coil 13 a is provided therein. The stator 12 has a plurality of cylindrical magnets 14 joined and arranged in the axial direction so that the same magnetic poles face each other, and a cylindrical spacer 15 joined and arranged on the left end side of the 14 magnets. A support rod 16 inserted in the center of the 14 magnets and the spacer 15 and a cylindrical case 17 fitted on the outer periphery of the 14 magnets and the spacer 15 are provided.

  As shown in FIGS. 1 to 3, sandwiching magnets 14 and spacers 15 at both ends of the support rod 16 in the cylindrical case 17 between both ends of the support rod 16 are held. As a means, a sandwiching structure 18 is provided. That is, the clamping shaft 19 is welded and fixed to the right end portion of the cylindrical case 17 by the welding portion 20, and the right end screw portion 16 a of the support rod 16 is screwed into the screw hole 19 a at the inner end center of the clamping shaft 19. Are combined. Inside the left end of the cylindrical case 17, a cylindrical clamping nut 21 and a locking nut 22 are screwed into the left end screw portion 16 b of the support rod 16. Then, by tightening these nuts 21 and 22, the magnets 14 and the spacer 15 resist the magnetic repulsive force between the magnets 14, and between the clamping shafts 19 and the clamping nuts 21 at both ends of the support rod 16. Is held between.

  The both ends of the cylindrical case 17 are used as fixing means for fixing the both ends of the cylindrical case 17 to the support portions 11A and 11B of the frame 11 integrally with the both ends of the support rod 16. A fixing structure 23 is provided. That is, as shown in FIGS. 1 and 2, a support hole 11 a is formed in the right support portion 11 </ b> A of the frame 11, and a support cylinder body 24 is fitted into the support hole 11 a and fixed by a plurality of screws 25. Has been. The fixing nut 26 is screwed into the threaded portion 19 b at the outer end of the clamping shaft 19 in a state where the clamping shaft 19 is inserted into the support cylinder 24. Accordingly, the right end portion of the cylindrical case 17 is fixed to the right support portion 11 </ b> A of the frame 11 through the clamping shaft 19 and the support cylinder body 24 together with the right end portion of the support rod 16.

  1 and 3, a support hole 11b is formed in the left support portion 11B of the frame 11, and a support cylinder 27 is fitted into the support hole 11b. It is fixed. The left end portion of the cylindrical case 17 is inserted into the support cylinder 27 and is welded and fixed at the welded portion 29. Accordingly, the left end portion of the cylindrical case 17 is fixed to the left support portion 11 </ b> B of the frame 11 via the support cylinder body 27.

  As shown in FIGS. 1 to 3, both the support portions 11 </ b> A and 11 </ b> B of the frame 11 are restricted to restrict the positions so that both ends of the support rod 16 and the cylindrical case 17 do not move outward in the axial direction. A restricting structure 30 is provided as a means. That is, brackets 31 </ b> A and 31 </ b> B are attached to the outer surfaces of both support cylinders 24 and 27 by a plurality of screws 32, respectively. Restriction bolts 33A and 33B are screwed into the brackets 31A and 31B, and are loosened by loosening prevention nuts 34A and 34B. Then, the right restriction bolt 33 </ b> A is brought into contact with the outer end of the clamping shaft 19, so that the position of the support rod 16 and the right end of the cylindrical case 17 is restricted so as not to move to the right. Further, the left-side regulating bolt 33B is brought into contact with the outer end of the clamping nut 21 via the collar 35, so that the left-end portion of the support rod 16 is regulated so as not to move to the left side.

  As shown in FIG. 3, a through hole 33a is formed at the center of the left regulating bolt 33B. When the stator 12 is assembled, the support rod 16 is inserted into the center of the magnet 14 through the through hole 33a, and then the left end screw portion 16b is cut to a predetermined length.

  As shown in FIGS. 1 to 3, mounting cylinders 36A and 36B are attached to the inner ends of the support cylinders 24 and 27 by a plurality of screws 37, and urethane pipes are attached to the inner end surfaces of the mounting cylinders 36A and 36B. Stoppers 38A and 38B made of an elastic material such as rubber are fixed by a plurality of screws 39. The movement range of the movable element 13 on the stator 12 is regulated by these stoppers 38A and 38B.

  In this linear motor, when a current is supplied to the coil 13 a of the mover 13, the mover 13 is moved in the axial direction on the stator 12 and stopped at a position corresponding to the predetermined magnet 14. When the mover 13 starts moving, is moving, and is stopped, the moving reaction force of the mover 13 acts on the 14 magnets. The movement reaction force is transmitted to the support rod 16 and the ends of the cylindrical case 17.

  In this case, in the stator 12 of the linear motor, both end portions of the cylindrical case 17 are integrated with both end portions of the support rod 16 with respect to the right support portion 11A and the left support portion 11B of the frame 11 by the fixing structure 23. Fixed. At the same time, both ends of the support rod 16 and the cylindrical case 17 are restricted by the restricting structure 30 so as not to move outward in the axial direction.

  That is, when a rightward force is applied to the 14 magnets, the force is received by the restriction bolt 33 </ b> A of the restriction structure 30 via the pinching shaft 19. Further, when a leftward force is applied to the 14 magnets, the force is transmitted to the clamping nut 21 via the spacer 15 and received by the restriction bolt 33B of the restriction structure 30 via the collar 35. It is done. Therefore, the magnets 14 are received at both ends by the restricting structure 30 fixed to the frame 11.

  Here, the right end screw portion 16 a of the support rod 16 is screwed into the screw hole 19 a of the pinching shaft 19, and the left end screw portion 16 b is screwed into the pinching nut 21. Therefore, the support rod 16, the clamping shaft 19, and the clamping nut 21 are integrated. Further, the right clamping shaft 19 and the cylindrical case 17 are integrated via a welded portion 20, and the left end of the cylindrical case 17 is integrated with a support cylindrical body 27 via a welded portion 29, and the support thereof. The cylindrical body 27 is integrated with the left clamping nut 21 via a bracket 31B, a restriction bolt 33A, and the like. Therefore, the cylindrical case 17, the both clamping shafts 19, and the clamping nuts 21 are integrated.

  For this reason, even if a large external force is applied to the 14 magnets, the external force is received by the cylindrical case 17, the support rod 16, the sandwiching shaft 19, and the sandwiching nut 21, and by the frame 11. Therefore, the rigidity of the stator 12 of this linear motor is remarkably improved and its deformation is suppressed. Therefore, according to this embodiment, the position accuracy of the mover 13 can be improved and the moving speed of the mover 13 can be increased.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
-Omit mounting cylinders 36A, 36B, stoppers 38A, 38B, and the like.

In the embodiment, the structure on the right end side and the structure on the left end side of the support rod 16 and the cylindrical case 17 are converted.
(Other technical ideas)
Technical ideas other than the technical ideas described in the claims will be described below.

(1) The stator of the linear motor according to claim 1, wherein the clamping means is a pair of left and right clamping shafts, and the support rod is screwed into the screw hole at the center of the clamping shaft. .
(2) The linear motor stator according to (1) above, wherein the restricting means is a bolt that is fixed to the frame and receives an end of the clamping shaft.

(3) The stator of the linear motor according to (1) or (2), wherein the cylindrical case is integrated with the sandwiching shaft.
(4) The stator of the linear motor according to any one of (1) to (3), wherein the support rod is integrated with the sandwiching shaft.

The principal part sectional view showing the stator of the linear motor of one embodiment. The fragmentary sectional view which expands and shows the support structure of the right end side of the stator of FIG. The fragmentary sectional view which expands and shows the support structure of the left end side of the stator of FIG. Sectional drawing which shows the principal part which shows the stator of the conventional linear motor. The fragmentary sectional view which expands and shows the support structure of the right end side of the stator of FIG. The fragmentary sectional view which expands and shows the support structure of the left end side of the stator of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Frame, 11A ... Right side support part, 11B ... Left side support part, 12 ... Stator, 13 ... Movable element, 14 ... Magnet, 16 ... Support rod, 17 ... Cylindrical case, 18 ... Clamping as clamping means Structure: 19 ... clamping shaft, 21 ... clamping nut, 23 ... fixing structure as fixing means, 24 ... right support cylinder, 26 ... fixing nut, 27 ... left support cylinder, 29 ... welding part, 30 ... regulation Restricting structure as a means, 33A ... right-side regulating bolt, 33B ... left-side regulating bolt.

Claims (1)

A plurality of cylindrical magnets joined and arranged in the axial direction so that the same magnetic poles face each other;
A support rod inserted through the center of the plurality of magnets;
A cylindrical case fitted around the outer periphery of the plurality of magnets;
In the cylindrical case, clamping means for clamping and holding the plurality of magnets between both ends of the support rod;
Fixing means for fixing both ends of the cylindrical case to the frame integrally with both ends of the support rod;
A linear motor stator comprising: a regulating means for regulating the position of the support rod and both ends of the cylindrical case so as not to move outward in the axial direction.

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