JP5424821B2 - Laminated iron core and armature using the same - Google Patents

Description

  The present invention relates to a laminated iron core in which an armature used for various motors including a linear motor, a generator, and the like, and a core member that is a magnetic material used in the armature are laminated.

  In an armature using a laminated iron core, the side surface of the laminated iron core may be directly tapped to fix other members to the armature. Here, the side surface of the laminated iron core is a surface connecting both end surfaces in the laminating direction, and refers to a surface where the grain of each core member can be seen. This makes it possible to reduce the number of parts and reduce the size and weight by reducing the space compared to the case of using another member having a tapped hole.

  In addition, simply tapping the laminated iron core may loosen the mounting in an environment where vibration is applied, and it is difficult to secure sufficient strength. The core members can be firmly fixed by coating, and fixing and integrating them. As described above, both the miniaturization and weight reduction of the armature and the securing of the strength of the tap hole have been achieved (for example, Patent Document 1).

JP-A-2005-287113 (page 4-5, FIG. 1-2)

  When a bolt is tightened in a tapped hole provided on the side surface of the laminated core, a force (F2) that pushes the thread of the tapped hole by the axial force (F1) of the bolt acts as shown in FIG. A force (F3) that spreads laterally acts on the core members (C1) on both sides. Since the core member (C1) arranged on both sides of the tap hole is divided into right and left by the tap hole as shown in the sectional view BB, the core member arranged on the right side of the tap hole by F3 is directed to the right. The core member disposed on the left side is displaced in the left direction so as to be bent, and cannot resist the axial force of the bolt. Therefore, the divided core member (C1) and the undivided core member (C2) laminated above or below are integrated by adhesion so as to sufficiently withstand F3. is necessary.

  In the laminated iron core shown in Patent Document 1, the core members are bonded and fixed by installing and heating the laminated iron core in a heating furnace or the like while pressing in the laminating direction. In this case, if the pressure and temperature in the stacking direction are not uniform depending on the location, a non-adhered location may occur locally. In particular, when such a non-bonded portion is generated between the core members C1 disposed on both sides of the tap hole or between the core members C1 and C2, the force that the core member C1 expands in the lateral direction independently. Since F3 is received and bent outward, there is a problem that the axial force of the bolt cannot be resisted and sufficient tap hole strength cannot be secured.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a laminated core capable of reliably ensuring the strength of the tap holes provided on the side surfaces of the laminated core and an armature using the same.

The laminated iron core according to the present invention is formed by laminating core members made of a magnetic material, and has both end faces in the laminating direction and a plurality of side faces connecting the both end faces.
Further, a tapped hole that is not a through hole is formed on at least one of the plurality of side surfaces, and a protruding portion in which a part of the core member protrudes in the stacking direction and a recessed portion in which the protruding portion fits are provided. The fitting portion is formed from the core member C1 divided to the left and right by the tap hole to the core member C2 which is not divided, and the tap hole is sandwiched with the center line of the tap hole for each tap hole. It is characterized in that it is formed on both sides of the portion for tightening the bolt in the hole.

According to the laminated core according to the present invention, for fastening a fitting portion bolt the convex portion and the convex portion protruding in the stacking direction and a recess to be fitted, is formed for each tap hole is not a through hole Rutotomoni, Since it is formed from the core member C1 divided to the left and right by the tapped hole to the core member C2 which is not divided, it is temporarily between the core members C1 arranged on both sides of the tapped hole or between the core members C1 and C2. Even if a non-adhesive spot occurs in any of the adhesive layers between them, the core member C2 is surely attached to the core member C2 by the convex and concave portions that fit the laterally pushing force F3 acting on the core member C1 of each tap hole. Can communicate. Further, the convex portion and the concave portion are formed on both sides of the portion where the bolt is fastened to the tap hole across the center line of the tap hole, and the force F3 transmitted from the core member C1 to C2 by the fitting portion is the core. Since the member C2 acts in the opposite direction, the deformation of the core member C2 and the core member C1 coupled to the core member C2 via the fitting portion can be suppressed.

  From the above, it is possible to resist the force F3 that spreads the core member generated based on the bolt axial force F1 in the lateral direction, and it is possible to reliably ensure the strength at the tap hole provided on the side surface of the laminated core.

It is the front view and AA sectional drawing of the laminated iron core by Embodiment 1 of this invention. It is an external view of the laminated iron core by Embodiment 1 of this invention. It is sectional drawing of the fitting part by Embodiment 1 of this invention. It is an external view of the laminated iron core after giving the coil | winding by Embodiment 1 of this invention. It is a front view of the linear motor to which the armature by Embodiment 1 of the present invention is applied. It is a component exploded view of the linear motor to which the armature according to the first embodiment of the present invention is applied. It is sectional drawing of the fitting part by Embodiment 1 of this invention, and a front view of a laminated iron core. It is sectional drawing of the fitting part by Embodiment 1 of this invention, and the front view of a core member. It is a front view of the laminated iron core by Embodiment 2 of this invention. It is an external view of the laminated iron core by Embodiment 2 of this invention. It is an external view of the laminated iron core after giving the coil | winding by Embodiment 3 of this invention. It is an external view of the armature after mold fixation by resin by Embodiment 3 of the present invention. It is an external view of the armature by Embodiment 4 of this invention. It is a figure which shows the force which acts on the thread part of a tapped hole, and a core member in the conventional laminated iron core.

Embodiment 1 FIG.
1 to 8 are views showing the outer shapes of the laminated core and the armature according to the first embodiment. FIG. 1a is a front view of the laminated core, FIG. 1b is a cross-sectional view taken along line AA in FIG. 1a, and FIG. 3 is a sectional view of the fitting portion, FIG. 4 is an outline view of the laminated core after winding, and FIG. 5 is a front view of a linear motor to which the armature according to the present embodiment is applied. 6 is an exploded view of parts of a linear motor to which the armature according to the present embodiment is applied. FIGS. 7 and 8 are sectional views of a fitting portion different from FIG. 3 and external views of a laminated core or core member. Show.

  The laminated iron core 1 is formed by punching with a press so that the outer shape of the core member 2 has a predetermined magnetic pole shape, and laminating them, and the end faces 3a and 3b in the stacking direction are connected between the end faces. A plurality of side surfaces 4 are formed. When the core member 2 is punched, as shown in a detailed cross-section in FIG. 3, a round-shaped convex portion 5 projecting from the lower surface in the stacking direction and a concave portion 6 fitted to the convex portion 5 are also formed. In the embodiment, as shown in FIGS. 1 and 2, the fitting portions 7 into which the convex portions 5 and the concave portions 6 are fitted are provided at three locations 7 a, 7 b, and 7 c.

  A tap hole 8 for fixing other parts used in the armature is provided in one of the side surfaces 4, and the convex portion 5 and the concave portion 6 are provided for each tap hole 8. Are formed on both sides of the center line. In order to prevent the core member 2 from peeling off in the stacking direction when the tap hole 8 is processed, it is necessary to fix the stacked core 1 in the stacking direction with a fixing tool such as a vise. Or you may process the tap hole 8 with respect to the laminated iron core 10 after the winding which constructed the coil | winding 9 in the laminated iron core 1 as shown in FIG. In this case, since the laminated iron core 1 is fastened by the tension of the wire rod 9, it contributes to preventing the core member 2 of the laminated iron core 1 from peeling off in the laminating direction.

  A necessary number of the laminated cores 10 after winding obtained in FIG. 4 are prepared and arranged linearly, thereby obtaining the armature 11 for the linear motor shown in FIG. As shown in FIG. 6, the armature 11 integrates the laminated cores 10 after winding by screwing bolts 14 into the tap holes 8 through through holes 13 provided in the mounting plate 12. The armature 11 is attached to a position facing the permanent magnet 16 fixed to the field yoke 15 via a magnetic gap. Here, when a current is passed through the winding 9, an electromagnetic force acts between the armature 11 and the permanent magnet 16, and a driving force can be obtained in the left-right direction in FIG.

  Here, when the laminated core 10 after winding is fixed to the mounting plate 12, when the bolt 14 is fastened to the tap hole 8, the core member 2 a arranged on both sides of the tap hole 8 and divided into right and left (FIG. 1). 14), a lateral force acts parallel to the laminated surface as described with reference to FIG. 14, but in the laminated core 1 according to the present embodiment, at the positions of 7a and 7b on both sides of the tap hole 8. Since the fitting part 7 is arrange | positioned, the force which acts on the core member 2a can be transmitted to the core member 2b which is not parted, and it can prevent that the core member 2a bends outside.

  Further, the outer diameter dimension of the convex part 5 formed in the fitting part 7 is formed slightly larger than the inner diameter dimension of the concave part 6, and this is laminated by fitting them together as shown in the lower side of FIG. As a result, a frictional force acts between the convex portion 5 and the concave portion 6. When the bolt 14 is tightened in the tap hole 8, a force that peels off the core member 2 in the stacking direction also acts, but the friction force between the convex portion 5 and the concave portion 6 resists the force in the stacking direction. Thus, deformation of the core member 2 can be suppressed. Further, in the present embodiment, since the winding 9 is provided around the laminated core 1, the laminated core 1 is tightened by the tension of the wire of the winding 9, so that the force in the laminating direction is received. And can withstand a greater bolting force.

  In the present embodiment, an example is shown in which the round fitting portion 7 in which the convex portion 5 and the concave portion 6 are formed is applied. However, as shown in FIG. 7A, the convex portion having a V-shaped cross section is shown. The fitting portions 17a and 17b having 5a and the recess 6a may be arranged on both sides of the center line of the tap hole 8. In order to prevent the core member 2a from bending outward when the bolt 14 is tightened in the tap hole 8, the divided core member 2a disposed on both sides of the tap hole 8 is prevented from sliding in the laminated surface. Since it is necessary, it is preferable to arrange the V-shaped cross-section to be parallel to the center line of the tap hole 8 as shown in FIG.

  Further, as shown in FIG. 8, a convex portion 5b formed by bending the single beam portion out of the laminated surface, and a concave portion 6b arranged at a position corresponding to the convex portion 5b and having a shape with which the convex portion 5b is fitted. The fitting portion 18 may be configured. The positions of the convex portion 5b and the concave portion 6b are provided at symmetrical positions across the center line of the core member 2, and the core member shown in FIG. 8b and the core member shown in FIG. 8c are alternately arranged as shown in FIG. 8a. The laminated iron core 1 is formed by laminating. Also in this case, in order to prevent the divided core member 2a disposed on both sides of the tap hole 8 from sliding within the laminated surface, the single beam portion of the tap hole 8 is formed as shown in FIGS. 8b and 8c. It is preferable to arrange them so as to be parallel to the center line.

  As described above, according to the laminated core 1 according to the present embodiment, the convex portion 5 protruding in the laminating direction and the concave portion 6 into which the convex portion 5 is fitted are formed for each tap hole 8, and thus each tap hole. Thus, the laterally expanding force acting on the core member 2a can be reliably transmitted to the core member 2b by the convex portion 5 and the concave portion 6 that are fitted. Further, the convex portion 5 and the concave portion 6 are formed on both sides of the center line of the tap hole 8, and the force transmitted from the core member 2a to 2b by the fitting portion 7 is reversed in the left-right direction in the core member 2b. Since it acts, the deformation of the core member 2b and the core member 2a connected to the core member 2b via the fitting portion can be suppressed.

  Therefore, it is possible to resist the force that spreads the core member 2 a generated based on the bolt axial force in the lateral direction, and the strength in the tap hole 8 provided in the side surface 4 of the laminated core 1 can be ensured reliably.

  Further, the armature 11 according to the present embodiment is configured such that a plurality of laminated iron cores 10 are firmly fixed via a mounting plate 12 by directly fastening bolts 14 to the tap holes 8. Therefore, since a separate part for fastening the bolt 14 is unnecessary, the number of parts can be reduced, and the manufacturing cost can be reduced. At the same time, the space for fixing the separate part can be reduced, It becomes possible to reduce the size and weight.

  In the present embodiment, an adhesive steel plate coated with an adhesive on the surface of the core member 2 may be used. However, depending on the size and application of the bolt 14, the frictional force between the convex portion 5 and the concave portion 6 and the winding 9 may be able to withstand a force that peels off the core member 2 in the stacking direction that acts when the bolt 14 is tightened in the tap hole 8 only by the tightening force due to the tension of the wire 9. In such a case, it is not necessary to use an expensive bonded steel sheet, or a process of applying an adhesive to a normal steel sheet can be omitted, so that the manufacturing cost can be reduced and heating can be performed at the same time. Manufacturing equipment such as a furnace is not required, and energy saving effects can be expected during manufacturing.

Embodiment 2. FIG.
9 and 10 show the structure of the laminated core according to the second embodiment of the present invention. FIG. 9 is a front view of the laminated core, and FIG. 10 is an external view of the laminated core.
The difference from the first embodiment is that, of the fitting portions 19a, 19b, and 19c, the fitting portions 19a and 19b arranged on both sides of the center line of the tap hole 8 are stacked in which the tap hole 8 is provided. This is a point provided in the vicinity of the side surface 4 of the iron core 1. Here, the vicinity of the side surface 4 means a state in which the fitting portions 19a and 19b are brought as close as possible to the side surface 4 so as not to cause external distortion on the side surface of the iron core. For example, a round shape as shown in FIG. When the convex part 5 and the concave part 6 are formed, the closest distance between the fitting parts 19a and 19b and the side face 4 can be empirically set to 1.5t (t is the thickness of the core member 2).

  As described in the first embodiment, when the bolt 14 is tightened in the tap hole 8, the core member 2a (see FIG. 1) arranged on both sides of the tap hole 8 and divided into the left and right is shown in FIG. A force in the direction shown by arrows 20a and 20b acts. Therefore, the core member 2a is a root portion divided by the tap hole 8 and receives a rotational moment that tends to spread on both sides around the portion indicated by reference numeral 21 in FIG. In order to prevent 2a from being deformed in the directions indicated by the arrows 20a and 20b, it is necessary to balance this rotational moment with the reaction force acting on the fitting portions 19a and 19b.

  According to the laminated core 1 according to the present embodiment, the fitting portions 19a and 19b arranged on both sides of the center line of the tap hole 8 are arranged in the vicinity of the side surface 4 of the laminated core 1 provided with the tap hole 8. Therefore, the length of the rotational moment due to the reaction force acting on the fitting portions 19a and 19b (the fitting portions 19a and 19b and the rotation center 21 in the direction perpendicular to the direction in which the forces 20a and 20b act) Distance) can be maximized. Therefore, the reaction force acting on the fitting portions 19a and 19b can be minimized, and the influence of deformation on the core member 2a can be extremely small. Therefore, the strength of the tap hole 8 and the reliability with respect to fastening can be improved.

  In addition, the fitting portions 19a and 19b are formed by punching, and deterioration of magnetic properties becomes a problem due to mechanical distortion at this time. According to the laminated core 1 according to the present embodiment, the fitting portions 19a and 19b Since 19b is arranged in the vicinity of the side surface 4, the magnetic flux density in the iron core is low in the vicinity of the side surface 4, so that the influence of the deterioration of the magnetic characteristics of this portion on the characteristics as the linear motor (decrease in motor output, Etc.) can be suppressed to a slight one.

Embodiment 3 FIG.
FIGS. 11 and 12 show the structure of the armature according to the third embodiment of the present invention. FIG. 11 is an outline view showing a plurality of laminated cores after winding, and FIG. The outline drawing of an armature is shown. In the armature 23 according to the present embodiment, as shown in FIG. 11, a necessary number of laminated cores 10 with windings 9 are arranged, and the outer periphery of the laminated core 10 is molded and fixed by a resin 22 as shown in FIG. Yes.

  As described above, according to the armature according to the present embodiment, since the outer peripheral portion of the laminated iron core 10 is fixed by the resin 22, the action of the fitting portions arranged on both sides across the center line of the tap hole 8 is achieved. In addition, it is possible to suppress deformation of the divided core member 2a (see FIG. 1) disposed on both sides of the tap hole 8 in the stacked surface. Further, the resin 22 can also suppress deformation of the core members 2a and 2b (see FIG. 1) in the stacking direction. As described above, the strength of the tap hole 8 can be further improved.

  Further, since the tap hole 8 is processed after the mold 22 is fixed with the resin 22, the cutting powder generated during the cutting process of the tap hole 8 is not mixed into the gap of the winding 9 and causes a short circuit. There is an effect that reliability against defects can be improved.

Embodiment 4 FIG.
FIG. 13 shows the structure of an armature 24 according to Embodiment 4 of the present invention. In this embodiment, an integrated laminated core 25 in which a plurality of magnetic poles are integrated is adopted. It is. In the first to third embodiments, the laminated core 1 divided for each magnetic pole is used. However, even when the integrated laminated core 25 is used as in the present embodiment, the side surface 26, when the tap holes 27 are provided, the fitting portions 28a and 28b are provided on both sides of the tap hole 27 with respect to the center line of the tap holes 27. The same effect can be achieved. In addition, since the armature 24 according to the present embodiment has the laminated iron core 25 integrated, a highly accurate laminated iron core can be obtained, and at the same time, assembly work can be omitted and productivity can be improved. There is also.

DESCRIPTION OF SYMBOLS 1 Laminated core 2 Core member 3a, 3b End surface 4 Side surface 5, 5a, 5b Convex part 6, 6a, 6b Concave part 7 Fitting part 8 Tap hole 9 Winding 11 Armature 17, 17a, 17b Fitting part 18 Fitting part 19a, 19b Fitting portion 22 Resin 23 Armature 24 Armature 25 Integrated laminated core 26 Side surface 27 Tap hole 28a, 28b Fitting portion

Claims (7)

A laminated core formed by laminating core members made of a magnetic material, and having both end surfaces in the stacking direction and a plurality of side surfaces connecting between both end surfaces,
A tapped hole that is not a through hole is formed to tighten a bolt on at least one of the plurality of side surfaces,
A core that is not divided from a core member C1 in which a part of the core member has a convex part protruding in the stacking direction and a concave part into which the convex part is fitted is divided into left and right by the tap hole. A laminated iron core formed over the member C2 and formed on both sides of a portion for fastening a bolt to the tap hole with the center line of the tap hole interposed between the tap holes. The laminated core according to claim 1, wherein the fitting portion is disposed in the vicinity of the side surface of the laminated core provided with the tapped holes. The laminated iron core according to claim 1 or 2, wherein the fitting portion includes a round convex portion and a concave portion that fits into the convex portion. The laminated core according to claim 1 or 2, wherein the fitting portion has a V-shaped cross section, and is arranged so that the V-shaped cross section is parallel to the center line of the tap hole. The fitting portion includes a single beam portion bent out of the laminated surface and a hole portion into which the single beam portion is fitted, and the single beam portion is arranged so as to be parallel to the center line of the tap hole. The laminated iron core according to claim 1 or 2, characterized in that A laminated iron core formed by laminating core members made of a magnetic material, and having both end faces in the laminating direction and a plurality of side faces connecting the both end faces;
An armature including two opposing surfaces of the plurality of side surfaces and a winding formed by winding a wire around the both end surfaces,
A tap hole that is not a through hole is formed to tighten a bolt on at least one of the plurality of side surfaces other than the two surfaces,
A core that is not divided from a core member C1 in which a part of the core member has a convex part protruding in the stacking direction and a concave part into which the convex part is fitted is divided into left and right by the tap hole. The armature, wherein the armature is formed over the member C2 and is formed on both sides of a portion where a bolt is fastened to the tap hole with a center line of the tap hole interposed between the tap holes. The armature according to claim 6, wherein an outer periphery of the laminated core is molded with a resin.

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