Armature core of linear motor

Abstract

The present invention relates to an armature core of a linear motor. Liquid is suppressed from penetrating into the interior of the armature core. The armature core of the linear motor includes: a core body having a plurality of teeth for winding, the core body being formed of laminated steel plates; a block disposed within the core body; a fastening hole provided in the block for inserting a fastener; and a fastener-through member having a fastener-through hole. The fastener-through member can be disposed within the core body in a state where the exterior of the core body and the interior of the fastening hole are connected via the fastener-through hole. The fastener penetrating the fastener-through hole is fastened to the block via the fastening hole, thereby securing the core body to a fixed object via the block. The armature core has a sealing structure that, when the fastener-through member surrounds the opening of the fastening hole, blocks liquid from passing from the opening to the exterior of the fastener-through member.

Description

Technical Field

[0001] The present invention relates to an armature core. Background Art

[0002] Conventionally, armature cores used in various motors, generators, and the like have been primarily composed of laminated steel plates (laminated iron cores) formed by stacking multiple silicon steel plates or other steel plates. Armatures including such armature cores have a known structure (see, for example, Patent Document 1) in which screw holes are provided in the laminated iron core constituting the armature of a linear motor, and bolts passing through a mounting plate are screwed into the screw holes to secure the laminated iron core to the mounting plate.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2011-101551 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, such armature cores are sometimes used in environments where they come into contact with liquids such as cutting fluids, such as in machine tools. If such liquids seep into the interior of the armature core (e.g., between the steel plates), the performance of the armature may be affected, leading to failure. Therefore, a structure that prevents liquids from entering the interior of the armature core is desired.

[0008] Solutions for solving problems

[0009] The armature core of one technical solution of the present disclosure includes: a core body having a plurality of teeth for winding a winding, the core body being composed of laminated steel plates; a block being arranged inside the core body; a fastening hole provided in the block for inserting a fastener; and a fastener penetration member having a fastener penetration hole, the fastener penetration member being capable of being arranged on the core body in a state in which the outside of the core body and the inside of the fastening hole are communicated via the fastener penetration hole, wherein the fastener penetrating the fastener penetration hole is fastened to the block via the fastening hole, thereby fixing the core body to a fixed object via the block, and the armature core having a sealing structure which blocks liquid from passing from the opening to the outside of the fastener penetration member when the fastener penetration member surrounds the opening of the fastening hole.

[0010] Effects of the Invention

[0011] According to one aspect, it is possible to suppress the intrusion of liquid into the armature core. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a perspective view of the armature core according to the first embodiment of the present disclosure.

[0013] Figure 2 It is a longitudinal sectional view showing a state where the armature core is covered with a cover according to the first embodiment.

[0014] Figure 3 It is a longitudinal sectional view showing the sealing structure of the first embodiment.

[0015] Figure 4 It is a longitudinal sectional view showing a state where the armature core according to the first embodiment is fixed to the mounting plate.

[0016] Figure 5 It is a longitudinal sectional view showing a sealing structure according to a second embodiment of the present disclosure.

[0017] Figure 6 This is a longitudinal sectional view showing a third embodiment of the present disclosure in which a flange portion is provided on the screw-through member of the second embodiment, and shows a state in which the screw-through member is being mounted on the core body.

[0018] Figure 7 It is a longitudinal sectional view showing a state where the screw-through member according to the third embodiment is attached to the core body.

[0019] Description of Reference Numerals

[0020] 1. Armature core; 3. Winding; 10. Core body; 12. Tooth portion; 20. Block; 25. Internally threaded hole (fastening hole); 25a. Opening; 30. Threaded member through-hole (fastener through-hole); 31. Threaded member through-hole (fastener through-hole); 35. Flange; 40. Sealing structure; 41. Groove; 42. Fitting portion; 45. Sealing member; 50. Mounting plate (fixed object); 60. Externally threaded member (fastener); 61. Externally threaded portion. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0022] (First embodiment)

[0023] Figure 1 FIG. 1 shows an armature core 1 for a linear motor according to a first embodiment. Figure 2 As shown, the armature core 1 is used with its entire surface covered by a cover 2 formed from a thin metal plate such as stainless steel. Cover 2 is provided on the armature core 1 to prevent liquids such as cutting fluid from coming into contact with the armature core 1. Cover 2 has a hole 2a at a location corresponding to a screw through-hole 31 (described later) that exposes the screw through-hole 31 to the outside.

[0024] like Figure 1 and Figure 2 As shown, the armature core 1 includes a core body 10, a plurality of blocks 20 disposed inside the core body 10, internal threaded holes 25 provided in the blocks 20, and screw-through members 30 provided in the core body 10. Figure 3 As shown, the armature core 1 includes a sealing structure 40 .

[0025] The core body 10 includes a rectangular plate portion 11 and a plurality of teeth 12 protruding from one side of the plate portion 11 and parallel to each other. Figure 1 The core body 10 has grooves 13 between the plurality of teeth 12. Figure 2 As shown, the winding 3 is wound around the teeth 12 so as to span the adjacent slots 13. Figure 2 The directions of the coordinate axes represented by X, Y, and Z shown below are the same as Figure 1 correspond.

[0026] like Figure 1 As shown, the core body 10 is composed of Figure 1 The core body 10 is formed by stacking a plurality of comb-shaped steel plates 14 in the X direction. Thin plates made of electromagnetic steel plates such as silicon steel plates are used as the steel plates 14. The steel plates 14 have a predetermined magnetic pole shape and are stacked in an aligned manner to form the core body 10.

[0027] The block 20 is made of metal and is in the shape of a rectangular parallelepiped. The block 20 is embedded in the root of the plurality of teeth 12 in the interior of the core body 10, at a position appropriately separated from the plurality of teeth 12. One of the reasons for embedding the block 20 in the root of the teeth 12 is to reduce the size of the core body 10 (especially the size in the Z direction). Figure 2 As shown, in this embodiment, in the longitudinal direction ( Figure 1 One block 20 is used at each end portion (in the Y direction), and two blocks 20 are used in the center portion, for a total of four blocks 20. Blocks 20 are disposed within through-holes 15 provided in the core body 10 and extending through the core body 10 in the stacking direction (X direction) of the steel sheets 14. Blocks 20 are secured to the core body 10 by adhesive or other means. The number of blocks 20 is not limited to four and can be arbitrarily set based on design requirements and other requirements.

[0028] like Figure 3As shown, the axial direction of the internal threaded hole 25 extends along the Z direction. The internal threaded hole 25 constitutes an example of a fastening hole disclosed in the present invention. The internal threaded hole 25 is provided in the block 20 in a state of being open to the surface 21 on the side of the plate portion 11 of the block 20. The internal threaded hole 25 has an opening portion 25a opened to the surface 21. The external threaded portion 61 of the external threaded member 60 described later is screwed into the opening portion 25a and fastened to the internal threaded hole 25. In this embodiment, in the longitudinal direction ( Figure 1 Two internal thread holes 25 are provided at a predetermined interval in the X direction. In addition, the number of the internal thread holes 25 is not limited, but can be arbitrarily set according to design requirements.

[0029] like Figure 3 As shown, the screw-through member 30 is a cylindrical member whose axial direction extends in the Z direction. The screw-through member 30 has a screw-through hole 31 in its interior. The screw-through member 30 constitutes an example of a fastener through member disclosed in the present invention. The screw-through hole 31 constitutes an example of a fastener through hole disclosed in the present invention. The screw-through member 30 and the internal threaded hole 25 are roughly concentrically engaged with the engaging hole 10a provided in the core body 10 corresponding to each internal threaded hole 25. The engaging hole 10a connects the outside of the surface 11a side of the plate portion 11 of the core body 10 and the inside of the internal threaded hole 25. In the cylindrical screw-through member 30, the outer diameter is slightly smaller than the width dimension of the block 20 ( Figure 3 The inner diameter (the inner diameter of the screw through hole 31) is larger than the inner diameter of the internal threaded hole 25. The screw through member 30 surrounds the opening 25a of the internal threaded hole 25.

[0030] like Figure 3 As shown, the sealing structure 40 has a groove 41 provided on the block 20 and a fitting portion 42 provided on the screw through member 30 and fitted with the groove 41. The groove 41 is a cylindrical slit (annular bottomed groove) provided on the surface 21 of the block 20. The fitting portion 42 is composed of an end portion of the screw through member 30 on the side opposite to the block 20. The fitting portion 42 is, for example, pressed into the groove 41 so as to fit in a state of close contact with the inner and outer peripheral surfaces of the groove 41. The sealing structure 40 blocks liquid from passing from the opening 25a to the outer peripheral side of the screw through member 30 when the screw through member 30 surrounds the opening 25a of the internal threaded hole 25. In addition, if it is designed to block the passage of liquid, it does not matter even if liquid sometimes inevitably passes through.

[0031] The screw-through member 30 is formed of metal, resin, or the like. When the screw-through member 30 is made of resin, the screw-through member 30 can be manufactured by injection molding. Alternatively, the screw-through member 30 can be integrally formed on the core body 10 by insert molding the resin into the fitting hole 10a. When insert molding is performed, the core body 10 with the block 20 mounted thereon is placed in a molding die, and resin is injected into the fitting hole 10a and the groove 41, thereby molding the screw-through member 30 and the sealing structure 40 together with the fitting portion 42 in the groove 41. When insert molding is used to mold the screw-through member 30, a plurality of screw-through members 30 can be simultaneously arranged on the core body 10, thereby having the advantage of seeking to improve productivity.

[0032] For example, Figure 4 As shown, the armature core 1 is fixed to the mounting plate 50 by means of an external threaded member 60 such as a bolt, and the mounting plate 50 is configured to be movable along a feed shaft (not shown) of a machine tool or the like. The mounting plate 50 constitutes an example of a fixed object disclosed herein. The external threaded portion 61 of the external threaded member 60 that passes through the mounting hole 50a of the mounting plate 50 is threadedly engaged with the internal threaded hole 25 from the opening portion 25a of the internal threaded hole 25 of the block 20 via the screw through hole 31 and fastened, so that the armature core 1 is fixed to the mounting plate 50 by means of the block 20. The armature core 1 is combined with an excitation magnetic pole (not shown) arranged on the side of the tooth portion 12 to form a linear motor. The linear motor is along Figure 1 The armature core 1 is driven linearly in the Y direction.

[0033] An armature core 1 according to a first embodiment of the present disclosure includes a core body 10 having a plurality of teeth 12 around which windings 3 are wound, the core body 10 being formed of laminated steel plates; a block 20 disposed within the core body 10; an internally threaded hole 25 provided in the block 20; and a screw-through member 30 having a screw-through hole 31. The screw-through member 30 can be disposed within the core body 10 so that the exterior of the core body 10 and the interior of the internally threaded hole 25 communicate with each other via the screw-through hole 31. The externally threaded portion 61 of the externally threaded member 60 is threadedly engaged and fastened with the internally threaded hole 25 via the screw-through hole 31, thereby securing the core body 10 to a mounting plate 50 via the block 20. The armature core 1 includes a sealing structure 40 that, when the screw-through member 30 surrounds the opening 25a of the internally threaded hole 25, blocks the passage of liquid from the opening 25a toward the outer periphery of the screw-through member 30.

[0034] In the armature core 1 of the first embodiment, for example, in the case where the armature core 1 comes into contact with a liquid such as oil or cutting fluid used in a machine tool, the infiltration of such liquid (hereinafter referred to as "liquid") into the armature core 1 is basically blocked by the cover 2. However, in addition to this, there is liquid that enters the interior of the cover 2 from the hole 2a of the cover 2. The liquid that enters the interior of the cover 2 from the hole 2a of the cover 2 enters the screw through hole 31 and reaches the periphery of the opening 25a of the block 20 (the periphery of the external threaded portion 61). The sealing structure 40 is used to prevent the liquid from passing to the outer peripheral side of the screw through member 30. That is, the fitting portion 42 of the screw through member 30 is fitted into the groove portion 41, thereby preventing the liquid from passing from the inner side of the screw through member 30 to the outer peripheral side.

[0035] Therefore, the liquid accumulates around the opening 25a of the block 20 inside the screw-through member 30 or penetrates the internal threaded hole 25, thereby preventing the liquid from penetrating into the interior of the core body 10 (such as between the steel plates 14). As a result, the occurrence of adverse events such as degradation of the linear motor's performance and malfunction due to the infiltration of liquid into the armature core 1 is suppressed.

[0036] Next, the second and third embodiments of the present disclosure will be described while citing the description of the first embodiment. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals, and their descriptions are omitted or simplified, with the differences mainly described.

[0037] (Second embodiment)

[0038] Figure 5 FIG2 shows a sealing structure 40 according to a second embodiment. The sealing structure 40 according to the second embodiment includes a sealing member 45 disposed between the block 20 and the screw-through member 30. The sealing member 45 is an annular member formed of an elastic member such as rubber, and is fitted into and disposed in the circumferential groove 22 provided on the surface 21 of the block 20. The annular end surface of the screw-through member 30, which faces the block 20, is pressed against the sealing member 45 while applying a certain degree of pressure. As a result, the sealing member 45 is fitted into the circumferential groove 22 in a slightly flattened state.

[0039] According to the second embodiment, the sealing member 45 blocks the passage of liquid from the inner side to the outer peripheral side of the screw penetration member 30. As in the first embodiment, this prevents the intrusion of liquid into the interior of the core body 10 (eg, between the steel plates 14). Consequently, the occurrence of problems such as a decrease in the performance of the linear motor or failures caused by the intrusion of liquid into the armature core 1 is suppressed.

[0040] (Third embodiment)

[0041] Figure 6 and Figure 7 A third embodiment is shown in which a flange portion 35 is added to the screw-through member 30 of the second embodiment.

[0042] The flange portion 35 is provided at an end portion on the outer side of the screw-through member 30 , that is, at an end portion on the opposite side to the block 20 . Figure 6 FIG. 3 shows a state where the flange portion 35 is being fitted into the fitting hole 10a of the core body 10. Figure 6 As shown, the flange portion 35 is naturally oriented inwardly in the axial direction of the screw through hole 31 ( Figure 6 Then, as Figure 7 As shown, when the screw through member 30 is fitted into the fitting hole 10a in a state of being pressed against the sealing member 45, the flange portion 35 is elastically deformed and elastically adheres to the surface 11a of the plate portion 11 of the core body 10. In this state, the flange portion 35 is arranged along the axial direction ( Figure 7 The Z direction) extends in a direction substantially perpendicular to the Z direction. Figure 4 When the armature core 1 is fixed to the mounting plate 50 in this manner, the screw penetration member 30 can be fitted into the fitting hole 10 a by pressing through the mounting plate 50 .

[0043] According to the third embodiment, the flange portion 35 suppresses liquid from entering the fitting hole 10a into which the screw penetration member 30 is fitted. Therefore, it is possible to further suppress liquid from entering the interior of the core body 10 (between the steel plates 14, etc.).

[0044] The sealing structure disclosed in the present invention is not limited to the sealing structure 40 of the above-mentioned first to third embodiments. As long as it is a structure that blocks liquid from passing from the opening 25a to the outer peripheral side of the screw-through component 30 when the screw-through component 30 surrounds the opening 25a of the internal threaded hole 25, it can be in any form.

[0045] In the above-described embodiments, the externally threaded member 60 is fastened to the block 20, thereby fixing the core body 10 to the mounting plate 50 via the block 20. However, the fastener of the present disclosure that is fastened to the block 20 is not limited to the externally threaded member 60. The fastener of the present disclosure may be of any form as long as it is a member that is fastened to the block 20, thereby fixing the core body 10 to the mounting plate 50 via the block 20.

Claims

1. An armature core of a linear motor, the armature core comprising: a core body having a plurality of teeth around which windings are wound, the core body being formed of laminated steel plates; a block disposed inside the core body; a fastening hole provided in the block for inserting a fastener; as well as A fastener-penetrating member having a fastener-penetrating hole, wherein the fastener-penetrating member can be arranged on the core body in a state where the outside of the core body and the inside of the fastening hole communicate with each other via the fastener-penetrating hole. The fastener that passes through the fastener through-hole is fastened to the block via the fastening hole, whereby the core body is fixed to the fixing object via the block. The armature core has a sealing structure that blocks liquid from passing through the opening to the outside of the fastener-through member in a state where the fastener-through member surrounds the opening of the fastening hole.

2. The armature core of the linear motor according to claim 1, wherein: The sealing structure includes a groove portion provided in the block and a fitting portion provided in the fastener penetration member and fitted in the groove portion.

3. The armature core of the linear motor according to claim 1, wherein: The sealing structure includes a sealing member provided between the block and the fastener penetration member.

4. The armature core of the linear motor according to any one of claims 1 to 3, wherein: The fastener penetration member includes a flange portion extending from an end portion of the fastener penetration member on the opposite side from the block in a direction substantially orthogonal to an axial direction of the fastener penetration hole.

5. The armature core of the linear motor according to any one of claims 1 to 3, wherein: The fastener is an externally threaded member having an externally threaded portion, and the fastening hole is an internally threaded hole into which the externally threaded portion is threadedly engaged.

6. The armature core of the linear motor according to claim 4, wherein: The fastener is an externally threaded member having an externally threaded portion, and the fastening hole is an internally threaded hole into which the externally threaded portion is threadedly engaged.

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