JP6841975B1 - Armature Iron core, armature and electric motor - Google Patents

Abstract

The stator core (5), which is an armature core, has a plurality of divided cores (11), each of which is a laminated body of a plurality of iron core pieces. Each of the plurality of divided iron cores (11) has a yoke portion (12) and a teeth portion (13) protruding from the yoke portion (12) in a second direction perpendicular to the first direction. The outer peripheral surface (15), which is the second surface of the yoke portion (12) opposite to the first surface, has a first groove portion (16a) and a second groove portion (16a) recessed in the second direction, respectively. Groove (16b) is provided. The laminate has a first portion constituting the first groove portion (16a), a second portion constituting the second groove portion (16b), and a first portion and a second portion in the first direction. Includes a third portion provided between and. The third portion includes a surface forming the end of the first groove portion (16a) in the first direction and a surface forming the end of the second groove portion (16b) in the first direction.

Description

The present invention relates to an armature core having a plurality of divided iron cores, an armature and an electric motor.

Conventionally, an armature iron core configured by connecting a plurality of divided iron cores in an annular shape is known. Each divided iron core is formed by laminating a plurality of iron core pieces which are electromagnetic steel plates. The split iron core has a yoke portion through which magnetic flux passes and a teeth portion protruding from the yoke portion. A coil is formed around the teeth portion by winding a wire rod after the insulator is installed.

The wire rod is wound in a state where the divided iron core to be wound is held by the jig. In order to accurately wind the wire rod around the split core, it is required that the split core can be accurately positioned and that the split core can be stably held against the tension applied to the wire.

Patent Document 1 discloses that in an armature core having a plurality of divided iron cores connected in an annular shape, a groove is provided on the outer peripheral surface of the divided iron core. The outer peripheral surface of the divided iron core is a surface of the yoke portion that is directed to the side opposite to the side on which the teeth portion protrudes. The groove portion is formed so as to extend in the stacking direction at the central portion of the yoke portion in the circumferential direction. The groove functions as a positioning reference when the wire rod is wound. The jig is provided with a fitting portion that can be fitted with the groove portion. When the split core is held by the jig, the fitting portion is fitted into the groove, so that the split core can be accurately positioned and the split core can be stably held. .. By enabling accurate winding of the wire around the split iron core, it is possible to reduce the occurrence of defects in the winding of the wire, and it is possible to manufacture an armature with high productivity.

Japanese Unexamined Patent Publication No. 2005-110464

The volume of the yoke portion provided with the groove portion is smaller than the volume of the yoke portion when the groove portion is not provided. As the volume of the yoke portion decreases, the magnetic flux that can pass through the yoke portion decreases, so that the torque that can be output by the electric motor provided with the armature iron core decreases. In this case, the electric motor cannot increase the torque that can be output even if the current flowing through the electric motor is increased, and high electrical characteristics cannot be obtained. Therefore, it is desired to suppress the volume reduction of the yoke portion as much as possible.

In the case of the prior art disclosed in Patent Document 1, the volume of the yoke portion is significantly reduced by forming the groove portion in the entire yoke portion in the stacking direction. Even if an attempt is made to increase the volume of the yoke portion by reducing the width of the groove portion in the circumferential direction, the smaller the width of the groove portion, the more difficult it is to stably hold the divided iron core in the jig. Further, as the width of the groove portion in the circumferential direction becomes smaller, it becomes more difficult to fit the fitting portion into the groove portion, so that the work efficiency when attaching the divided iron core to the jig deteriorates. Further, the smaller the width of the groove, the more difficult it is to manufacture the iron core piece. Therefore, it is difficult to increase the volume of the yoke portion by reducing the width of the groove portion in the circumferential direction. As described above, according to the prior art, while it is possible to manufacture an armature with high productivity, there is a problem that it is difficult to realize high electrical characteristics due to a decrease in the volume of the yoke portion.

The present invention has been made in view of the above, and it is desired to obtain an armature iron core capable of manufacturing an armature with high productivity and realizing high electric characteristics in an electric motor having an armature. The purpose.

In order to solve the above-mentioned problems and achieve the object, the armature core according to the present invention has a plurality of divided cores, each of which is a laminated body of a plurality of iron core pieces, and the plurality of divided cores are connected to each other. To. Each of the plurality of divided iron cores has a yoke portion and a teeth portion protruding from the yoke portion in a second direction perpendicular to the first direction, which is the direction in which the plurality of iron core pieces are laminated. The second surface of the yoke portion opposite to the first surface on which the teeth portion is provided is provided with a first groove portion and a second groove portion, each of which is recessed in the second direction. There is. The laminate is provided between the first portion forming the first groove portion, the second portion forming the second groove portion, and the first portion and the second portion in the first direction. The third part is included. The third portion includes a surface forming the end of the first groove portion in the first direction and a surface forming the end of the second groove portion in the first direction. A third groove that is recessed in the second direction is provided between the first groove and the second groove on the second surface. The width of the third groove in the third direction perpendicular to the first direction and the second direction is smaller than the width of the first groove in the third direction, and the width of the third groove is smaller than that of the third groove. Less than the width in the direction of.

The armature iron core according to the present invention has an effect that the armature can be manufactured with high productivity and that a high electric characteristic can be realized in an electric motor having an armature.

Sectional drawing of the electric motor which has a stator according to Embodiment 1 of this invention Perspective view of the stator core constituting the stator according to the first embodiment. The figure which shows the cross section of the stator core in line III-III shown in FIG. The figure which shows the cross section of the stator core in line IV-IV shown in FIG. The figure which shows the plane structure of the 1st to 5th iron core pieces shown in FIG. 3 and FIG. The figure which shows the structure in the cross section of the 1st to 5th iron core pieces shown in FIG. 3 and FIG. The figure which shows the structure in the vertical cross section of the 1st to 5th iron core pieces shown in FIG. 3 and FIG. The figure which shows the state which the wire rod is wound around the split core which constitutes the stator core shown in FIG. The figure for demonstrating the winding of a wire rod around a split iron core shown in FIG. The first figure which shows how the split iron core shown in FIG. 8 is held by the holding mechanism. FIG. 2 shows a state in which the split iron core shown in FIG. 8 is held by the holding mechanism. A perspective view showing a jig constituting the holding mechanism shown in FIG. A perspective view showing a state in which an iron core piece is fitted in the jig shown in FIG. Perspective view of the stator core constituting the stator according to the second embodiment of the present invention. Top view of the split iron core constituting the stator core shown in FIG. The figure which shows the cross section of the stator core shown in FIG. The figure which shows the vertical cross section of the stator core shown in FIG. The figure which shows the plane structure of the 1st to 5th iron core pieces shown in FIG. 16 and FIG. The figure which shows the structure in the vertical cross section of the 1st to 5th iron core pieces shown in FIG. 16 and FIG. The figure which shows the state that the split iron core shown in FIG. FIG. 6 is a diagram showing a state in which a wire rod is wound around the divided iron core shown in FIG. An enlarged view of a portion of the configuration shown in FIG. 21 including a third groove portion and a fitting portion. The figure which shows the state that the split iron core shown in FIG. 20 is sandwiched by a transport mechanism. Cross-sectional view of the split iron core constituting the stator according to the third embodiment of the present invention. The figure which shows the 1st structural example of the split iron core in Embodiment 3. The figure which shows the state that the split iron core shown in FIG. 25 is held by the holding mechanism. The figure which shows the 2nd structural example of the split iron core in Embodiment 3. The figure which shows the state which adjusted the length in the 1st direction about the split iron core shown in FIG. FIG. 28 shows how the adjusted split iron core shown in FIG. 28 is held by the holding mechanism. The figure which shows the split iron core which concerns on the 1st comparative example of Embodiment 3. The figure which shows the state that the split iron core shown in FIG. 30 is held by the holding mechanism. The figure which shows the split iron core which concerns on the 2nd comparative example of Embodiment 3. The figure which shows the state that the split iron core shown in FIG. 32 is held by the holding mechanism. The figure which shows the split iron core which concerns on the 3rd comparative example of Embodiment 3. The figure which shows the state which adjusted the length in the 1st direction about the split iron core shown in FIG. 34. FIG. 3 is a diagram showing how the adjusted split iron core shown in FIG. 35 is held by the holding mechanism. Cross-sectional view of a linear motor having an armature according to a fourth embodiment of the present invention.

Hereinafter, the armature iron core, the armature, and the electric motor according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. Further, in the drawings shown below, in order to make the drawings easier to see, there are cases where hatching is added in the plan view and cases where hatching is not added in the cross-sectional view.

Embodiment 1.
FIG. 1 is a cross-sectional view of a motor having a stator according to the first embodiment of the present invention. The motor 1 which is an electric motor has a stator 2 which is an armature, a rotor 3 which is a field magnet surrounded by the stator 2 and provided rotatably, and a frame 4. A gap is provided between the stator 2 and the rotor 3.

The stator 2 has a stator core 5 which is an armature core, an insulator 6 which insulates the stator core 5, and a coil 7 which generates a rotating magnetic field. The coil 7 is wound around a portion of the stator core 5 where the insulator 6 is provided. The rotor 3 has a rotor core 8 which is a field core, a shaft 9 provided at the center of the rotor core 8, and a plurality of permanent magnets 10. The rotor 3 rotates about the axis C of the shaft 9. The cross section shown in FIG. 1 is a cross section perpendicular to the axis C. In the following description, the direction of the axis C is referred to as the axial direction, the direction along the circumference of the circle centered on the axis C is referred to as the circumferential direction, and the direction of the diameter of the circle centered on the axis C is referred to as the radial direction. There is. The plurality of permanent magnets 10 are arranged in the circumferential direction.

The motor 1 has a bearing that rotatably holds the shaft 9 and a bracket into which the bearing is fitted. The frame 4 covers the periphery of the stator 2 and holds the rotor 3 via bearings and brackets. Bearings and brackets are not shown.

The stator core 5 has a plurality of divided cores 11 connected to each other. The plurality of divided iron cores 11 are arranged in the circumferential direction. Each of the plurality of divided iron cores 11 is a laminated body of a plurality of iron core pieces. Each of the plurality of iron core pieces is an electromagnetic steel plate. The plurality of iron core pieces are stacked on each other in the first direction, which is the axial direction.

The split iron core 11 has a yoke portion 12 and a teeth portion 13 protruding from the yoke portion 12. The tooth portion 13 projects from the yoke portion 12 toward the axis C in the radial direction. The end portion of the teeth portion 13 on the axis C side in the radial direction is wider in the circumferential direction than the portion of the teeth portion 13 other than the end portion. A slot, which is a space in which the coil 7 is arranged, is formed between the tooth portions 13 adjacent to each other in the circumferential direction. The insulator 6 covers the inner peripheral surface of the yoke portion 12, which is the first surface of the yoke portion 12 on which the teeth portion 13 is provided, and the side surface of the teeth portion 13 directed in the circumferential direction.

The divided iron cores 11 that are adjacent to each other in the circumferential direction are rotatably connected to each other by a connecting portion 14 provided at an end portion of the yoke portion 12 in the circumferential direction. The outer peripheral surface 15 of the divided iron core 11 is a second surface of the yoke portion 12 opposite to the inner peripheral surface on which the teeth portion 13 is provided. A groove 16 is provided on the outer peripheral surface 15. The iron core pieces stacked on each other are fixed at the caulking portion 17. The split iron core 11 is provided with caulking portions 17 at three locations. The number of caulking portions 17 in the divided iron core 11 and the positions where the caulking portions 17 are provided in the divided iron core 11 may be appropriately changed.

FIG. 2 is a perspective view of a stator core constituting the stator according to the first embodiment. In FIG. 2, the arrow D1 represents the first direction described above. The first direction is a direction in which a plurality of iron core pieces are laminated in each divided iron core 11. The arrow D2 represents a second direction perpendicular to the first direction. The arrow D3 represents a third direction perpendicular to the first and second directions. The tooth portion 13 projects from the yoke portion 12 in the second direction.

When the stator core 5 is removed from the motor 1, the stator core 5 can be deformed by the rotation of the divided cores 11 at each connecting portion 14. FIG. 2 shows the stator core 5 in a linearly developed state.

As shown in FIG. 1, when the stator core 5 is annular, the end face 18 of the divided core 11 located at one end of the plurality of divided cores 11 constituting the stator core 5 in the third direction is It comes into contact with the end face 19 of the split core 11 located at the other end of the plurality of split cores 11 in the third direction. From the state shown in FIG. 2, the stator core 5 is formed into an annular shape by deforming the stator core 5 so that the end face 18 and the end face 19 are in contact with each other.

Two groove portions 16 are provided on the outer peripheral surface 15 of each divided iron core 11. The first groove portion 16a is a groove portion 16 provided on the side of one end of the outer peripheral surface 15 in the first direction. The second groove portion 16b is a groove portion 16 provided on the side of the other end of the outer peripheral surface 15 in the first direction. Each of the first groove portion 16a and the second groove portion 16b is recessed in the second direction. In FIG. 2, the end of the divided iron core 11 on the side where the first groove portion 16a is provided is referred to as the lower end, and the end of the divided iron core 11 on the side where the second groove portion 16b is provided is referred to as the upper end. There is.

The first groove portion 16a and the second groove portion 16b are provided at the central portion of the outer peripheral surface 15 in the third direction. A groove 16 is not provided in the central portion of the outer peripheral surface 15 in the first direction. The first groove portion 16a and the second groove portion 16b are arranged separately on the upper end side and the lower end side, respectively, with a central portion which is a portion where the groove portion 16 is not provided. As described above, the groove portion 16 is provided in a portion of the outer peripheral surface 15 other than the central portion in the first direction.

The divided iron core 11, which is a laminated body of iron core pieces, includes a first portion constituting the first groove portion 16a, a second portion constituting the second groove portion 16b, and a first portion in the first direction. It has a third portion provided between the second portion. The first portion is a laminated body of iron core pieces forming the first groove portion 16a among the plurality of iron core pieces constituting the divided iron core 11, and includes the lower end of the divided iron core 11. The second portion is a laminated body of the iron core pieces forming the second groove portion 16b among the plurality of iron core pieces constituting the divided iron core 11, and includes the upper end of the divided iron core 11. The third portion is a laminated body of the iron core pieces forming the first groove portion 16a and the iron core pieces other than the iron core pieces forming the second groove portion 16b among the plurality of iron core pieces constituting the divided iron core 11. It constitutes the above-mentioned central part.

FIG. 3 is a diagram showing a cross section of the stator core in line III-III shown in FIG. FIG. 4 is a diagram showing a cross section of the stator core in the IV-IV line shown in FIG. The cross section shown in FIG. 3 is a cross section parallel to the first direction and the third direction, and is a cross section of the yoke portion 12 connected to each other. The cross section shown in FIG. 4 is a cross section parallel to the first direction and the second direction, and is a vertical cross section of the yoke portion 12 and the teeth portion 13. In the following description, the right and left are the right and left when the stator core 5 developed in a straight line as shown in FIG. 2 is viewed from the side of the teeth portion 13. The end face 18 is the left end face of the stator core 5, and the end face 19 is the right end face of the stator core 5. FIG. 3 shows a cross section of a part of the stator core 5 including the end face 19. The configuration shown in FIGS. 3 and 4 is an example of the configuration of the stator core 5.

Here, a plurality of iron core pieces arranged in the third direction are referred to as a group of iron core pieces. The plurality of iron core piece groups constituting the stator core 5 include the first to fifth iron core piece groups 21, 22, 23, 24, 25. The first iron core piece 31 is an iron core piece constituting the first iron core piece group 21. The second iron core piece 32 is an iron core piece constituting the second iron core piece group 22. The third iron core piece 33 is an iron core piece constituting the third iron core piece group 23. The fourth iron core piece 34 is an iron core piece constituting the fourth iron core piece group 24. The fifth iron core piece 35 is an iron core piece constituting the fifth iron core piece group 25. The first iron core piece 31, the second iron core piece 32, the third iron core piece 33, the fourth iron core piece 34, and the fifth iron core piece 35 have different structures from each other.

In the example shown in FIGS. 3 and 4, the divided iron core 11 is a laminated body composed of 18 iron core pieces. The 18 iron core pieces include one first iron core piece 31, six second iron core pieces 32, five third iron core pieces 33, three fourth iron core pieces 34, and three. A fifth iron core piece 35 is included.

A first iron core piece 31 is provided at the lower end of the divided iron core 11. On the first iron core piece 31, a second iron core piece 32, a third iron core piece 33, a fourth iron core piece 34, and a fifth iron core piece 35 are determined based on the structure of each iron core piece. They are stacked in the same order. A second iron core piece 32 is provided at the upper end of the divided iron core 11.

The first iron core piece 31 has a hole 26. Each of the second iron core piece 32, the third iron core piece 33, the fourth iron core piece 34, and the fifth iron core piece 35 has a protrusion 27. The hole 26 and the protrusion 27 form a connecting portion 14.

The protrusion 27 is a raised circular portion of the iron core piece. A circular recess is formed on the back side of the portion of the iron core piece where the protrusion 27 is provided. Each of the second iron core piece 32, the third iron core piece 33, the fourth iron core piece 34, and the fifth iron core piece 35 is laminated with the protrusion 27 facing downward. The hole 26 is circular and is formed so that the protrusion 27 can be fitted. The protrusion 27 provided on the second iron core piece 32 stacked on the first iron core piece 31 is fitted into the hole 26. The protrusion 27 is rotatable in a state of being fitted in the hole 26. For each iron core piece other than the first iron core piece 31, a protrusion 27 provided on one of the upper iron core pieces of the two iron core pieces stacked on each other is provided on the other iron core piece below. It is fitted into the recess that is being made. The protrusion 27 is rotatable in a state of being fitted in the recess.

In each iron core piece group, a gap 30 is provided between two iron core pieces adjacent to each other. In the first iron core piece group 21, the gap 30 provided between the two first iron core pieces 31 adjacent to each other is located to the right of the connecting portion 14. In the second iron core piece group 22, the gap 30 provided between the two second iron core pieces 32 adjacent to each other is located to the left of the connecting portion 14. In the third iron core piece group 23, the gap 30 provided between the two third iron core pieces 33 adjacent to each other is located to the right of the connecting portion 14. In the fourth iron core piece group 24, the gap 30 provided between the two fourth iron core pieces 34 adjacent to each other is located to the left of the connecting portion 14. In the fifth iron core piece group 25, the gap 30 provided between the two fifth iron core pieces 35 adjacent to each other is located to the right of the connecting portion 14. In the stator core 5, iron core pieces having a gap 30 on the right side of the connecting portion 14 and iron core pieces having a gap 30 on the left side of the connecting portion 14 are alternately laminated.

In the first iron core piece group 21, the hole 26 is provided in the first iron core piece 31 on the left side of the two first iron core pieces 31 adjacent to each other. In the second iron core piece group 22, the protrusion 27 is provided on the second iron core piece 32 on the right side of the two second iron core pieces 32 adjacent to each other. In the third iron core piece group 23, the protrusion 27 is provided on the third iron core piece 33 on the left side of the two third iron core pieces 33 adjacent to each other. In the fourth iron core piece group 24, the protrusion 27 is provided on the fourth iron core piece 34 on the right side of the two fourth iron core pieces 34 adjacent to each other. In the fifth iron core piece group 25, the fifth iron core piece 35 on the left side of the two fifth iron core pieces 35 adjacent to each other is provided.

The first iron core piece 31 has a hole 28. Each of the second iron core piece 32, the third iron core piece 33, the fourth iron core piece 34, and the fifth iron core piece 35 has a protrusion 29. The hole 28 and the protrusion 29 form a caulking portion 17.

The protrusion 29 is a raised rectangular portion of the iron core piece. A rectangular recess is formed on the back side of the portion of the iron core piece where the protrusion 29 is provided. Each of the second iron core piece 32, the third iron core piece 33, the fourth iron core piece 34, and the fifth iron core piece 35 is laminated with the protrusion 29 facing downward. The hole 28 is a rectangle into which the protrusion 29 can enter. The protrusion 29 provided on the second iron core piece 32 stacked on the first iron core piece 31 is in a state of being inserted into the hole 28 and is fastened to the hole 28. For each iron core piece other than the first iron core piece 31, the protrusion 29 provided on one of the upper iron core pieces among the two iron core pieces stacked on each other is provided on the other iron core piece below. It is said that it has entered the recessed area and is fastened to the recessed area.

As shown in FIG. 4, the first portion 20a constituting the first groove portion 16a is a laminated body of five iron core pieces. In the first portion 20a, the second iron core piece 32 and the third iron core piece 33 are alternately laminated on the first iron core piece 31. The second portion 20b constituting the second groove portion 16b is a laminated body of seven iron core pieces. The second iron core piece 32 and the third iron core piece 33 are alternately laminated on the second portion 20b. The third portion 20c in which the groove portion 16 is not provided is a laminated body of six iron core pieces. In the third portion 20c, the fourth iron core piece 34 and the fifth iron core piece 35 are alternately laminated. The first portion 20a is the lower end portion of the laminated body which is the divided iron core 11, that is, one end portion of the divided iron core 11 in the first direction. The second portion 20b is the upper end portion of the laminated body which is the divided iron core 11, that is, the other end portion of the divided iron core 11 in the first direction. The third portion 20c is a central portion in the first direction of the laminated body which is the divided iron core 11. The third portion 20c is stacked on top of the first portion 20a. The second portion 20b is stacked on top of the third portion 20c.

The surface 20c1 which is the lower end of the third portion 20c constitutes a surface located at the upper end of the first groove portion 16a. The surface 20c2, which is the upper end of the third portion 20c, constitutes the lower end of the second groove portion 16b. As described above, the third portion 20c includes a surface 20c1 forming the end of the first groove portion 16a in the first direction and a surface 20c2 forming the end of the second groove portion 16b in the first direction. No groove 16 is provided between the surface 20c1 and the surface 20c2.

FIG. 5 is a diagram showing a planar configuration of the first to fifth iron core pieces shown in FIGS. 3 and 4. FIG. 6 is a diagram showing a configuration in a cross section of the first to fifth iron core pieces shown in FIGS. 3 and 4. FIG. 7 is a diagram showing a configuration in a vertical cross section of the first to fifth iron core pieces shown in FIGS. 3 and 4.

In FIG. 5, four of the twelve first iron core pieces 31 constituting the first iron core piece group 21 and the twelve second iron core pieces 32 constituting the second iron core piece group 22 are shown. Four of them, four of the twelve third iron core pieces 33 constituting the third iron core piece group 23, and the twelve fourth iron core pieces 34 constituting the fourth iron core piece group 24. Four of them and four of the twelve fifth iron core pieces 35 constituting the fifth iron core piece group 25 are shown. FIG. 6 shows the same cross section as in FIG. FIG. 7 shows the same vertical cross section as in FIG.

Of the first iron core pieces 31 constituting the first iron core piece group 21, each first iron core piece 31 other than the one first iron core piece 31 forming the end face 18 is provided with a hole 26. There is. In the first iron core piece 31, the hole 26 is provided at the left end 36 of the yoke portion 12. Each of the first iron core pieces 31 constituting the first iron core piece group 21 is provided with three holes 28 and a notch 38 forming the groove portion 16.

Of the second iron core pieces 32 constituting the second iron core piece group 22, each second iron core piece 32 other than the one second iron core piece 32 constituting the end face 19 is provided with a protrusion 27. ing. In the second iron core piece 32, the protrusion 27 is provided at the right end 37 of the yoke portion 12. Each of the second iron core pieces 32 constituting the second iron core piece group 22 is provided with three protrusions 29 and a notch 38 forming the groove portion 16.

Of the third iron core pieces 33 constituting the third iron core piece group 23, each third iron core piece 33 other than one third iron core piece 33 forming the end face 18 is provided with a protrusion 27. ing. In the third iron core piece 33, the protrusion 27 is provided at the left end 36 of the yoke portion 12. Each of the third iron core pieces 33 constituting the third iron core piece group 23 is provided with three protrusions 29 and a notch 38 forming the groove portion 16.

Of the fourth iron core pieces 34 constituting the fourth iron core piece group 24, each fourth iron core piece 34 other than one fourth iron core piece 34 forming the end face 19 is provided with a protrusion 27. ing. In the fourth iron core piece 34, the protrusion 27 is provided at the right end 37 of the yoke portion 12. Each of the fourth iron core pieces 34 constituting the fourth iron core piece group 24 is provided with three protrusions 29. The fourth iron core piece 34 is not provided with a notch 38.

Of the fifth iron core pieces 35 constituting the fifth iron core piece group 25, each fifth iron core piece 35 other than one fifth iron core piece 35 constituting the end face 18 is provided with a protrusion 27. ing. In the fifth iron core piece 35, the protrusion 27 is provided at the left end 36 of the yoke portion 12. Each of the fifth iron core pieces 35 constituting the fifth iron core piece group 25 is provided with three protrusions 29. The fifth iron core piece 35 is not provided with a notch 38.

In FIG. 5, the outer shape of the first iron core piece 31 is the same as the outer shape of the second iron core piece 32 except that the shapes of the ends 36 and 37 are different. The outer shape of the first iron core piece 31 is the same as the outer shape of the third iron core piece 33. The outer shape of the second iron core piece 32 is the same as the outer shape of the fourth iron core piece 34 except that the notch 38 is provided. The outer shape of the first iron core piece 31 is the same as the outer shape of the fifth iron core piece 35 except that the notch 38 is provided. As described above, each of the first to fifth iron core pieces 31, 32, 33, 34, 35 is different from each other except that at least one of the end portion 36, 37 portion and the notch portion 38 portion is different from each other. , The same shape as each other. Further, each of the first to fifth iron core pieces 31, 32, 33, 34, and 35 has the same size. By stacking the first to fifth iron core pieces 31, 32, 33, 34, 35, the divided iron core 11 can reduce the unevenness that reduces the volume of the divided iron core 11. .. As a result, the stator core 5 can pass as much magnetic flux as possible in the portion other than the portion where the groove portion 16 is provided, and the torque that can be output by the motor 1 can be increased.

Each of the iron core pieces forming the first portion 20a has a notch portion 38 having the same shape formed at the same position, and the shape of the ridge line portion forming the outer peripheral surface 15 of the outer shape of the iron core piece is all. It is the same. Each of the iron core pieces forming the second portion 20b has a notch portion 38 having the same shape formed at the same position, and the shape of the ridge line portion forming the outer peripheral surface 15 of the outer shape of the iron core piece is all. It is the same. Each of the iron core pieces forming the third portion 20c is not provided with the notch portion 38, and the shape of the ridge line portion forming the outer peripheral surface 15 of the outer shape of the iron core piece is the same.

The divided iron core 11 is not limited to one in which an iron core piece having a protrusion 27 at the end 36 and an iron core piece having a protrusion 27 at the end 37 are alternately laminated. The divided iron core 11 may include a portion in which iron core pieces having protrusions 27 at the end 36 are laminated with each other, and the iron core pieces having protrusions 27 at the ends 37 may be laminated with each other. May include a portion in which is laminated.

The groove portion 16 is used to fix the position of the divided iron core 11 in the holding mechanism for holding the divided iron core 11 when the magnet wire, which is a wire rod, is wound around the divided iron core 11. FIG. 8 is a diagram showing a state in which a wire rod is wound around a split iron core constituting the stator core shown in FIG. A winding machine is used to wind the wire rod 41 around the divided iron core 11. The winding machine winds the wire rod 41 around the teeth portion 13 of the split iron core 11 by turning the nozzle 40 that supplies the wire rod 41 around the split iron core 11.

FIG. 8 shows a jig 46 that constitutes the holding mechanism. When the wire rod 41 is wound around the divided iron core 11, one divided iron core 11 is held by the holding mechanism. The stator core 5 is in a state of being bent between the split core 11 held by the holding mechanism and the split core 11 adjacent to the split core 11. As a result, a space for turning the nozzle 40 is secured around the split iron core 11 held by the holding mechanism.

The inner claw 42 and the outer claw 43, and the inner claw 44 and the outer claw 45 form a transport mechanism for transporting the split iron core 11. The inner claw 44 and the outer claw 45 convey the split iron core 11 to be charged into the holding mechanism. The inner claw 42 and the outer claw 43 convey the split iron core 11 discharged from the holding mechanism. The split iron cores 11 before the wire rod 41 is wound are arranged in a row while being sandwiched between the inner claws 44 and the outer claws 45 facing each other. The split iron cores 11 after the wire rod 41 is wound are arranged in a row while being sandwiched between the inner claws 42 and the outer claws 43 facing each other.

FIG. 9 is a diagram for explaining winding of the wire rod around the divided iron core shown in FIG. FIG. 9 shows how the nozzle 40 is swiveling in the cross section taken along the line IX-IX shown in FIG. In FIG. 9, the nozzle 40 is assumed to rotate counterclockwise around the tooth portion 13.

While the nozzle 40 turns from the position P1 to the position P2, the tension applied to the wire rod 41 acts on the right corner 51 of the lower end of the tooth portion 13. As shown in FIG. 9, the direction of the tension acting on the angle 51 gradually changes from the direction of the arrow F1 to the direction of the arrow F2.

While the nozzle 40 turns from the position P2 to the position P3, the tension applied to the wire rod 41 acts on the right corner 52 of the upper end of the tooth portion 13. As shown in FIG. 9, the direction of the tension acting on the angle 52 gradually changes from the direction of the arrow F2 to the direction of the arrow F3.

While the nozzle 40 turns from the position P3 to the position P4, the tension applied to the wire rod 41 acts on the left corner 53 of the upper end of the teeth portion 13. As shown in FIG. 9, the direction of the tension acting on the angle 53 gradually changes from the direction of the arrow F3 to the direction of the arrow F4.

While the nozzle 40 turns from the position P4 to the position P1, the tension applied to the wire rod 41 acts on the left corner 54 of the lower end of the tooth portion 13. As shown in FIG. 9, the direction of the tension acting on the angle 54 gradually changes from the direction of the arrow F4 to the direction of the arrow F1.

In this way, when the wire rod 41 is wound around the split iron core 11, the tension of the wire rod 41 is the first iron core piece 31 forming the lower end of the divided iron core 11 and the second iron core piece 31 forming the upper end of the divided iron core 11. Acts on each of the iron core pieces 32 of. The groove portion 16 is provided in a first portion 20a including the lower end of the divided iron core 11 and a second portion 20b including the upper end of the divided iron core 11. The holding mechanism can hold the divided iron core 11 at the first portion 20a which is the upper end portion and the second portion 20b which is the lower end portion. A groove 16 is not provided in the third portion 20c, which is the central portion of the divided iron core 11. In the stator core 5, the central portion of the split core 11 can be used to improve the torque characteristics.

FIG. 10 is a first view showing how the split iron core shown in FIG. 8 is held by the holding mechanism. FIG. 10 shows a cross section taken along line X-X shown in FIG. The holding mechanism has two jigs 46 and 47 facing each other. The holding mechanism holds the divided iron core 11 by sandwiching the divided iron core 11 between two jigs 46 and 47. The jig 46 comes into contact with the second iron core piece 32 that constitutes the upper end of the divided iron core 11. The jig 47 comes into contact with the first iron core piece 31 forming the lower end of the divided iron core 11.

A protrusion 48 is provided on the surface of the jig 46 facing the jig 47. Like the jig 46, the jig 47 is provided with a protrusion 48 on a surface facing the jig 46. The protrusion 48 provided on the jig 46 and the protrusion 48 provided on the jig 47 are provided with a fitting portion 49 that can be fitted into the groove portion 16.

The jig 46 can reciprocate in a direction approaching the jig 47 and a direction away from the jig 47. The jig 47 can reciprocate between a direction approaching the jig 46 and a direction away from the jig 46. The holding mechanism moves the jig 46 and the jig 47 so that the jig 46 and the jig 47 come close to each other in a state where the divided iron core 11 is placed between the jig 46 and the jig 47. Grasp the split iron core 11 by. The holding mechanism releases the gripped split iron core 11 by moving the jig 46 and the jig 47 in a direction away from each other from the state of holding the split iron core 11.

FIG. 11 is a second view showing how the split iron core shown in FIG. 8 is held by the holding mechanism. FIG. 11 shows a cross section taken along line XI-XI shown in FIG. FIG. 11 shows a state in which the fitting portion 49 of the jig 47 is fitted into the first groove portion 16a of the split iron core 11 held by the holding mechanism. The fitting portion 49 of the jig 46 is fitted into the second groove portion 16b of the split iron core 11 held by the holding mechanism, as in the case shown in FIG.

In the cross section shown in FIG. 11, the first groove portion 16a has a so-called dovetail shape. The width of the first groove portion 16a in the third direction is increased from the outer peripheral surface 15 toward the teeth portion 13. The fitting portion 49 is an end portion of the protrusion 48 on the side that comes into contact with the split iron core 11, and is a portion that protrudes to the left and right according to the shape of the first groove portion 16a. The first groove portion 16a may have any shape as long as it has a portion where the width in the third direction is expanded from the outer peripheral surface 15 toward the teeth portion 13.

FIG. 12 is a perspective view showing a jig constituting the holding mechanism shown in FIG. FIG. 13 is a perspective view showing how the iron core piece is fitted into the jig shown in FIG. In the jig 47 shown in FIG. 12, the length of the protrusion 48 in the direction perpendicular to the surface 50 facing the jig 46 is La. The length of the first groove portion 16a in the first direction is longer than that of La.

FIG. 13 shows how the first iron core piece 31 forming the lower end of the divided iron core 11 is fitted into the jig 47. In a state where the holding mechanism holds the split iron core 11, the regions 50a of the surface 50 located on the left and right sides of the fitting portion 49 come into contact with the first iron core piece 31.

The second groove portion 16b has the same shape as the first groove portion 16a. The width of the second groove portion 16b in the third direction is increased from the outer peripheral surface 15 toward the teeth portion 13. The second groove portion 16b may have any shape as long as it has a portion where the width in the third direction is expanded from the outer peripheral surface 15 toward the teeth portion 13. The jig 46 shown in FIG. 10 has the same structure as the jig 47 shown in FIGS. 11 to 13. The mode in which the fitting portion 49 provided in the jig 46 is fitted into the second groove portion 16b is the same as the mode in which the fitting portion 49 provided in the jig 47 is fitted into the first groove portion 16a. ..

Since the groove 16 and the jigs 46 and 47 are configured in this way, the fitting of the fitting portion 49 into the groove 16 and the extraction of the fitting portion 49 from the groove 16 are performed with respect to the divided iron core 11. This is done by moving the jigs 46 and 47 in a direction parallel to the first direction. Further, in the state where the fitting portion 49 is fitted into the groove portion 16, the movement of the split iron core 11 in the second direction and the third direction with respect to the jigs 46 and 47 is suppressed.

The divided iron cores 11 to be held by the holding mechanism may include divided iron cores 11 having different lengths in the stacking direction. If the holding mechanism holds the divided iron core 11 using one jig, the jig is replaced according to the length of the divided iron core 11 in the stacking direction. In the first embodiment, since the holding mechanism holds the upper end and the lower end of the split core 11 by using two jigs 46 and 47, the holding mechanism holds the split core 11 having different lengths in the stacking direction. , Common jigs 46 and 47 can be used. As described above, the holding mechanism can hold the divided iron cores 11 by using the common jigs 46 and 47 when the lengths of the divided iron cores 11 in the stacking direction are various.

As described above, the groove portions 16 provided at the upper end portion and the lower end portion of the split iron core 11 on which tension acts are fixed by the jigs 46 and 47, so that the movement of the split core 11 due to the action of tension is caused. It is further suppressed. As a result, the holding mechanism can accurately position the split iron core 11 and hold the split iron core 11. Further, the holding mechanism can stably hold the divided iron core 11.

By enabling accurate positioning of the divided iron core 11 and stable holding of the divided iron core 11, the winding machine can accurately wind the wire rod 41 around the divided iron core 11. By enabling accurate winding of the wire rod 41 around the divided iron core 11, it is possible to reduce the occurrence of defects in the winding of the wire rod 41, and it is possible to manufacture the stator 2 with high productivity.

Further, since the groove portion 16 is not provided in the central portion of the yoke portion 12 in the first direction, the yoke portion 12 is compared with the case where the groove portion 16 is provided in the entire yoke portion 12 in the first direction. Volume can be increased. As the volume of the yoke portion 12 increases, the magnetic flux that can pass through the yoke portion 12 increases, so that the torque that can be output by the motor 1 increases. Therefore, the motor 1 can increase the torque that can be output by increasing the current flowing through the motor 1, and can obtain high electrical characteristics.

According to the first embodiment, in the stator core 5, the split core 11 has a first portion 20a constituting the first groove portion 16a, a second portion 20b forming the second groove portion 16b, and a first portion. Includes a third portion 20c provided between the portion 20a and the second portion 20b. The third portion 20c includes a surface 20c1 forming the end of the first groove portion 16a and a surface 20c2 forming the end of the second groove portion 16b, and the groove portion 16 is provided in the third portion 20c. Not done. As a result, the stator core 5 has the effect that the stator 2 can be manufactured with high productivity and that high electrical characteristics can be realized in the electric motor having the stator 2.

Embodiment 2.
FIG. 14 is a perspective view of a stator core constituting the stator according to the second embodiment of the present invention. In the second embodiment, a third groove portion 60 is provided on the outer peripheral surface 15 of each of the divided iron cores 11 constituting the stator core 5. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the configurations different from those in the first embodiment will be mainly described.

The third groove portion 60 is provided at the center of the outer peripheral surface 15 in the third direction. Further, the third groove portion 60 is provided at the central portion of the outer peripheral surface 15 in the first direction. The third groove portion 60 is a third portion of the divided iron core 11 between the first portion provided with the first groove portion 16a and the second portion provided with the second groove portion 16b. It is provided in. The third portion is a laminated body of iron core pieces forming the third groove portion 60 among the plurality of iron core pieces constituting the divided iron core 11.

FIG. 15 is a plan view of the divided cores constituting the stator core shown in FIG. FIG. 15 shows a plane on the upper end side of the divided iron core 11. In the plane shown in FIG. 15, the third groove portion 60 has a V shape. The width of the third groove 60 in the third direction is smaller than the width of the second groove 16b in the third direction. Further, the width of the third groove portion 60 in the third direction is smaller than the width of the first groove portion 16a in the third direction. The shape of the third groove 60 is not limited to the V shape, and may be a shape other than the V shape. The shape of the third groove 60 may be rectangular, semi-circular, or the like.

FIG. 16 is a diagram showing a cross section of the stator core shown in FIG. FIG. 17 is a diagram showing a vertical cross section of the stator core shown in FIG. FIG. 16 shows a cross section similar to the cross section shown in FIG. FIG. 17 shows a vertical cross section similar to the vertical cross section shown in FIG. In the stator core 5 according to the second embodiment, instead of the fourth iron core group 24 and the fifth iron core group 25 shown in FIGS. 3 and 4, the fourth iron core group 61 and the fifth iron core group 61 and the fifth iron core group 5 An iron core piece group 62 is provided. The fourth iron core piece 64 is an iron core piece constituting the fourth iron core piece group 61. The fifth iron core piece 65 is an iron core piece constituting the fifth iron core piece group 62.

As shown in FIG. 17, the third portion 20c constituting the third groove portion 60 is a laminated body of six iron core pieces. In the third portion 20c, the fourth iron core piece 64 and the fifth iron core piece 65 are alternately laminated. The depth of the third groove 60 in the second direction is shallower than the depth of the first groove 16a in the second direction and shallower than the depth of the second groove 16b in the second direction. The third portion 20c includes a surface 20c1 forming an end of the first groove 16a in the first direction and a surface 20c2 forming an end of the second groove 16b in the first direction. A groove having a depth equal to or greater than the depth of the first groove 16a and the second groove 16b is not provided between the surface 20c1 and the surface 20c2.

FIG. 18 is a diagram showing a planar configuration of the first to fifth iron core pieces shown in FIGS. 16 and 17. FIG. 19 is a diagram showing a configuration in a vertical cross section of the first to fifth iron core pieces shown in FIGS. 16 and 17.

Each of the fourth iron core pieces 64 constituting the fourth iron core piece group 61 is provided with a notch portion 63 forming a third groove portion 60. Further, the fourth iron core piece 64 is provided with a protrusion 27 as in the fourth iron core piece 34 of the first embodiment. Each of the fifth iron core pieces 65 constituting the fifth iron core piece group 62 is provided with a notch portion 63 forming a third groove portion 60. Further, the fifth iron core piece 65 is provided with a protrusion 27 as in the fifth iron core piece 35 of the first embodiment. The configuration of the fourth and fifth iron core piece groups 61 and 62 in the cross section is the same as the configuration of the fourth and fifth iron core piece groups 24 and 25 shown in FIG. 6 in the cross section.

The shapes of the first to fifth iron core pieces 31, 32, 33, 64, 65 are different from each other except that at least one of the shapes of the ends 36 and 37 and the shapes of the notches 38 and 63 is different from each other. They are the same as each other. Further, each of the first to fifth iron core pieces 31, 32, 33, 64, and 65 has the same size. Each of the iron core pieces forming the third portion 20c has a notch portion 63 having the same shape formed at the same position, and the shape of the ridge line portion forming the outer peripheral surface 15 of the outer shape of the iron core piece is all. It is the same.

The third groove portion 60 is used when transporting the split iron core 11 charged into the holding mechanism and when transporting the split iron core 11 discharged from the holding mechanism. FIG. 20 is a diagram showing how the divided iron core shown in FIG. 14 is conveyed. In the second embodiment, the outer claw 45 and the outer claw 43 are provided with a protrusion 66 that can be fitted into the third groove 60. In addition, in FIG. 20, in order to show the positional relationship of each element, when there is an element and an element arranged in the back of the paper surface of the element, the element in the back of the paper surface is transparent to the element in front of the paper surface. There is a part that is shown so that it can be seen.

While the wire rod 41 is wound around the split iron core 11, the transport mechanism uses the ends of the inner claw 44 and the outer claw 45 on the side opposite to the jig 46 side, as in the case shown in FIG. Take a lifted posture. Further, while the wire rod 41 is wound around the split iron core 11, as shown in FIG. 8, the transport mechanism holds the ends of the inner claw 42 and the outer claw 43 on the side opposite to the jig 46 side. Take a lifted posture.

FIG. 21 is a diagram showing a state in which a wire rod is wound around the divided iron core shown in FIG. FIG. 22 is an enlarged view of a portion of the configuration shown in FIG. 21 including a third groove portion and a fitting portion. FIG. 21 shows a plane on the upper surface side of the divided iron core 11. Further, the portion surrounded by the broken line in FIG. 21 shows a state in which the fitting portion 49 is fitted to the first groove portion 16a in the cross section of the split iron core 11 and the protrusion 48. In FIG. 22, the region XXII shown in FIG. 21 is enlarged and shown.

The protrusion 66 of the outer claw 45 is provided at a position facing the divided iron core 11 located at the end on the side of the jig 47 among the divided iron cores 11 sandwiched between the inner claws 44 and the outer claws 45. The protrusion 66 faces the third groove 60 provided in the split iron core 11. The protrusion 66 has a convex shape that can be fitted into the third groove 60.

The outer claw 43 shown in FIG. 21 is also provided with a protrusion 66 similar to the protrusion 66 shown in FIG. The protrusion 66 of the outer claw 43 is provided at a position facing the divided iron core 11 located at the end on the side of the jig 47 among the divided iron cores 11 sandwiched between the inner claw 42 and the outer claw 43. The protrusion 66 faces the third groove 60 provided in the split iron core 11. The protrusion 66 of the outer claw 43 also has a convex shape that can be fitted into the third groove 60.

When the winding of the wire rod 41 in one divided iron core 11 is completed, the transport mechanism is sandwiched between the inner claw 44 and the outer claw 45 as shown in the first stage from the top in FIG. 20 from the state shown in FIG. The posture is changed so that the split iron core 11 which is provided, the split core 11 held by the holding mechanism, and the split core 11 sandwiched between the inner claw 42 and the outer claw 43 are aligned in a straight line.

Next, as shown in the second row from the top in FIG. 20, the inner claw 42 and the outer claw 43 move in directions away from each other. The inner claw 42 and the outer claw 43 are separated from the split iron core 11 between the inner claw 42 and the outer claw 43. After that, the inner claw 42 and the outer claw 43 move until the protrusion 66 reaches above the split iron core 11a held by the holding mechanism.

Next, the inner claw 42 and the outer claw 43 move in a direction approaching each other. As shown in the third step from the top in FIG. 20, the inner claw 42 and the outer claw 43 come into contact with the split iron core 11 between the inner claw 42 and the outer claw 43.

FIG. 23 is a diagram showing a state in which the split iron core shown in FIG. 20 is sandwiched between the transport mechanisms. FIG. 23 is a cross section perpendicular to the cross section shown in FIG. 21 and shows a cross section passing through the first groove portion 16a, the second groove portion 16b, and the third groove portion 60. The protrusion 66 of the outer claw 43 is fitted into the third groove 60 of the split iron core 11 held by the holding mechanism. After that, the holding mechanism separates the divided iron core 11 that is being gripped by moving the jig 46 and the jig 47 in a direction away from each other.

After the holding mechanism releases the split iron core 11, the transport mechanism has an inner claw 42 and an outer claw 43 in a state of sandwiching the split iron core 11, and an inner claw 44 and an outer claw in a state of sandwiching the split iron core 11. 45 is moved with respect to the jigs 46 and 47. As the inner claw 42 and the outer claw 43 move, the split iron core 11a held by the holding mechanism is discharged from the holding mechanism as shown in the fourth step from the top in FIG. Further, by moving the inner claw 44 and the outer claw 45, the split iron core 11b to be wound next is put into the holding mechanism. The groove portion 16 of the split iron core 11b charged into the holding mechanism is positioned at the position of the fitting portion 49.

After that, the holding mechanism grips the divided iron core 11b by moving the jig 46 and the jig 47 so that the jig 46 and the jig 47 come close to each other. The fitting portion 49 is fitted into the groove portion 16 of the split iron core 11b inserted into the holding mechanism. As a result, the holding mechanism holds the split iron core 11b charged into the holding mechanism.

Next, the inner claw 44 and the outer claw 45 move in directions away from each other. The inner claw 44 and the outer claw 45 are separated from the split iron core 11 between the inner claw 44 and the outer claw 45. After that, the inner claw 44 and the outer claw 45 move until the protrusion 66 reaches a position facing the split iron core 11c on the right side of the split iron core 11b held by the holding mechanism. After that, the inner claw 44 and the outer claw 45 move in a direction approaching each other. The inner claw 44 and the outer claw 45 come into contact with the split iron core 11 between the inner claw 44 and the outer claw 45. The protrusion 66 of the outer claw 45 is fitted into the third groove 60 of the split iron core 11c.

After that, the transport mechanism returns to the same posture as that shown in FIG. The winding machine starts winding the wire rod 41 around the split iron core 11 held by the holding mechanism. By repeating such an operation, the holding mechanism and the conveying mechanism wind the wire rod 41 around each of the divided iron cores 11 of the stator core 5.

The holding mechanism holds the split iron core 11 by fitting the fitting portion 49 into the groove portion 16 in a state where the protrusion 66 of the outer claw 45 is fitted into the third groove portion 60. Further, the transport mechanism fits the protrusion 66 of the outer claw 43 into the third groove 60 while the fitting portion 49 is fitted into the groove 16, and grips the split iron core 11 discharged from the holding mechanism. To do. As a result, the transport mechanism can reduce defects in transport of the split iron core 11. For example, the transport mechanism can reduce transport errors due to variations in the dimensions of the split iron core 11.

According to the second embodiment, the third portion 20c of the divided iron core 11 is provided with a third groove portion 60 having a width smaller than that of the groove portion 16. Also in the second embodiment, the volume of the yoke portion 12 can be increased as compared with the case where the groove portion 16 is provided over the entire area in the first direction. The motor 1 can increase the torque that can be output, and can obtain high electrical characteristics. Further, since the divided iron core 11 is provided with the first groove portion 16a and the second groove portion 16b, the holding mechanism can accurately position the divided iron core 11 and can accurately position the divided iron core 11 as in the case of the first embodiment. The divided iron core 11 can be stably held. As a result, the stator core 5 has the effect that the stator 2 can be manufactured with high productivity and that high electrical characteristics can be realized in the electric motor having the stator 2. Further, the stator core 5 can reduce defects in the transfer of the split iron core 11 by the transfer mechanism.

Embodiment 3.
In the third embodiment, the relationship between the length of the first groove portion 16a in the first direction and the length of the second groove portion 16b in the first direction will be described. FIG. 24 is a cross-sectional view of a split iron core constituting the stator according to the third embodiment of the present invention. FIG. 24 shows a cross section similar to the cross section shown in FIG. The split core 11 shown in FIG. 24 has the same configuration as the split core 11 of the second embodiment. The split core 11 of the third embodiment may have the same configuration as the split core 11 of the first embodiment. In the third embodiment, the same components as those in the first and second embodiments are designated by the same reference numerals, and the configurations different from those of the first and second embodiments will be mainly described.

In FIG. 24, L1 is the length of the first groove portion 16a in the first direction. L2 is the length of the second groove portion 16b in the first direction. L3 is the length of the split core 11 in the first direction, that is, the length between the lower end 72 of the split core 11 and the upper end 73 of the split core 11. L4 is the length of the first groove portion 16a and the third groove portion 60 in the first direction. In the third embodiment, L1 <L2 holds. Further, L1 and L2 are arranged so that the difference between L2 and L1 is larger than the variation width of the length assumed due to the variation in the thickness 70 of the iron core pieces and the variation in the distance 71 between the iron core pieces. Is set.

Next, the effect of establishing L1 <L2 will be described. The more iron core pieces that are stacked, the larger the fluctuation range due to the variation. Therefore, "the fluctuation width of L1 <the fluctuation width of L4 <the fluctuation width of L3" is established. Further, since L2 = L3-L4 holds, the relationship of "fluctuation width of L1 <fluctuation width of L2" is assumed.

Here, the length of the protrusion 48 provided on the jigs 46 and 47 shown in FIG. 10 in the first direction is La. Further, when L1 = Lb, the interval required for inserting the protrusion 48 having a length of La into the first groove 16a is Lg. In this case, Lb = La + Lg holds.

When the split core 11 is manufactured, if L3 exceeds an appropriate range, L3 can be adjusted by reducing the number of stacked iron core pieces. In this case, the iron core piece is removed from the upper end side of the divided iron core 11. The reason why the iron core piece is removed from the upper end side will be described later. Let Le be the maximum adjustment width of L3 when L3 = Ld. In this case, assuming that L2 = Lc, Lc = Lb + Le = La + Le + Lg holds. Further, the relationship of La <Lb <Lc is established. The specification of the split iron core 11 that satisfies the above conditions may be referred to as specification 1 in the following description.

FIG. 25 is a diagram showing a first configuration example of the split iron core according to the third embodiment. FIG. 26 is a diagram showing how the split iron core shown in FIG. 25 is held by the holding mechanism. The first configuration example is an example in which the split core 11 of the above specification 1 and L3 is within an appropriate range in the manufactured split core 11. Ldmax is the maximum value in the appropriate range. Ldmin is the minimum value in the appropriate range. In this case, as shown in FIG. 26, the protrusion 48 of the jig 47 is inserted into the first groove 16a, and the protrusion 48 of the jig 46 is inserted into the second groove 16b. The holding mechanism can normally hold the split iron core 11.

FIG. 27 is a diagram showing a second configuration example of the split iron core according to the third embodiment. The second configuration example is an example in which the split core 11 of the above specification 1 and the L3 of the manufactured split core 11 exceeds an appropriate range. In the case shown in FIG. 27, L3 is longer than Ldmax. In this case, L3 is adjusted to be within an appropriate range by removing the iron core piece from the upper end side of the manufactured divided iron core 11. If L3 is shorter than Ldm in, the manufactured split iron core 11 is discarded because it cannot be adjusted so that L3 is within an appropriate range.

When adjusting L3, it is assumed that the iron core piece is removed from the lower end side of the divided iron core 11. When the first iron core piece 31 constituting the lower end 72 is removed from the divided iron core 11 shown in FIG. 27, the protrusion 29 provided on the second iron core piece from the bottom protrudes from the divided iron core 11. It becomes. Therefore, the amount of decrease in L3 is reduced by the amount of the protrusion 29 remaining. Further, when the protrusion 29 protrudes from the lower end 72 of the split iron core 11, the holding of the split iron core 11 in the holding mechanism may become unstable. On the other hand, when the second iron core piece 32 constituting the upper end 73 is removed from the divided iron core 11 shown in FIG. 27, the protrusion 29 does not protrude from the divided iron core 11. The amount of decrease in L3 is an amount corresponding to the thickness 70. Further, since the lower end 72 of the divided iron core 11 can be made flat, the divided iron core 11 can be stably held by the holding mechanism. Therefore, when adjusting L3, the iron core piece is removed from the upper end side of the divided iron core 11.

FIG. 28 is a diagram showing a state in which the length of the divided iron core shown in FIG. 27 is adjusted in the first direction. The divided iron core 11 shown in FIG. 28 is the divided iron core 11 according to the second configuration example, and the second iron core piece 32 constituting the upper end 73 is removed from the state shown in FIG. 27. The upper end 73 of the divided iron core 11 shown in FIG. 28 is composed of a third iron core piece 33. As shown in FIG. 28, L3 is adjusted within an appropriate range.

FIG. 29 is a diagram showing how the adjusted split iron core shown in FIG. 28 is held by the holding mechanism. As shown in FIG. 29, the protrusion 48 of the jig 47 is inserted into the first groove 16a. Further, since Lc = La + Le + Lg holds, even if Le is subtracted from L2 by adjusting L3, La + Lg having a length that allows the protrusion 48 to be inserted into the second groove 16b is provided in L2. Secured. Therefore, the holding mechanism can insert the protrusion 48 of the jig 46 into the second groove 16b. As a result, the holding mechanism can normally hold the adjusted split iron core 11.

FIG. 30 is a diagram showing a split iron core according to the first comparative example of the third embodiment. The first comparative example is a configuration example in the case where L1 <L2 is not satisfied. In the divided iron core 11 shown in FIG. 30, L1 = L2 = Lc = La + Le + Lg holds. The specification of the split iron core 11 in which such a condition is satisfied may be referred to as a specification 2 in the following description. The first comparative example is an example in which the split core 11 of the specification 2 and L3 is within an appropriate range in the manufactured split core 11.

FIG. 31 is a diagram showing how the split iron core shown in FIG. 30 is held by the holding mechanism. Each of the length of the first groove portion 16a and the length of the second groove portion 16b is longer than La + Lg, which is the length into which the protrusion 48 can be inserted, by the amount of Le. Since the protrusion 48 of the jig 47 is inserted into the first groove 16a and the protrusion 48 of the jig 46 is inserted into the second groove 16b, the holding mechanism normally holds the split iron core 11. be able to. However, a useless gap 74 corresponding to Le is generated between the upper end of the first groove portion 16a and the upper end of the protrusion 48 of the jig 47. Compared with the case shown in FIG. 26, since the volume of the yoke portion 12 is reduced by the amount of the interval 74, the torque that can be output by the motor 1 is reduced.

FIG. 32 is a diagram showing a split iron core according to the second comparative example of the third embodiment. The second comparative example is a configuration example in the case where L1 <L2 is not satisfied. In the divided iron core 11 shown in FIG. 32, L1 = L2 = Lb = La + Lg holds. The specification of the split iron core 11 in which such a condition is satisfied may be referred to as a specification 3 in the following description. The second comparative example is an example in which the split core 11 of the specification 3 and L3 is within an appropriate range in the manufactured split core 11.

FIG. 33 is a diagram showing how the split iron core shown in FIG. 32 is held by the holding mechanism. The protrusion 48 of the jig 47 is inserted into the first groove 16a. Further, the protrusion 48 of the jig 46 is inserted into the second groove 16b. The holding mechanism can normally hold the split iron core 11.

FIG. 34 is a diagram showing a split iron core according to the third comparative example of the third embodiment. The third comparative example is an example in which the split core 11 of the above specification 3 and the L3 of the manufactured split core 11 exceeds an appropriate range. In the case shown in FIG. 34, L3 is longer than Ldmax. In this case, as in the case of the second configuration example shown in FIG. 27, the iron core piece is removed from the upper end side of the manufactured split iron core 11 so that L3 is adjusted to be within an appropriate range.

FIG. 35 is a diagram showing a state in which the length of the divided iron core shown in FIG. 34 is adjusted in the first direction. The divided iron core 11 shown in FIG. 35 is the divided iron core 11 according to the third comparative example, in which the second iron core piece 32 constituting the upper end 73 is removed from the state shown in FIG. 34. The upper end 73 of the divided iron core 11 shown in FIG. 35 is composed of a third iron core piece 33. As shown in FIG. 35, L3 is adjusted within an appropriate range.

FIG. 36 is a diagram showing how the adjusted split iron core shown in FIG. 35 is held by the holding mechanism. Since La + Lg having a length capable of inserting the protrusion 48 into the first groove 16a is secured for Lb which is L1, the protrusion 48 of the jig 47 is inserted into the first groove 16a. On the other hand, when L2 = Lb = La + Lg holds, when Le is subtracted from L2 by adjusting L3, L2 is shorter than La + Lg, which is the length at which the protrusion 48 can be inserted into the first groove 16a. Become. Therefore, in the holding mechanism, a gap 75 is generated between the upper end 73 of the split iron core 11 and the jig 46. When the gap 75 is generated, the holding of the split iron core 11 by the holding mechanism becomes insufficient. As described above, in the specification 3, when the adjustment of L3 is required, it becomes difficult to accurately position the split core 11 in the holding mechanism and to stably hold the split core 11 by the holding mechanism.

According to the third embodiment, the stator core 5 has a split core in the holding mechanism because the length of the second groove 16b in the second direction is longer than the length of the first groove 16a in the first direction. Accurate positioning of the 11 and stable holding of the split iron core 11 by the holding mechanism are possible. Further, the motor 1 can obtain high electrical characteristics. As a result, the stator core 5 has the effect that the stator 2 can be manufactured with high productivity and that high electrical characteristics can be realized in the electric motor having the stator 2.

The electric motor provided with the stator 2 according to the first to third embodiments is not limited to the motor 1. The stator 2 may be provided in an electric motor other than the motor 1. In the fourth embodiment, a case where the stator 2 is provided in a linear motor which is one of the electric motors other than the motor 1 will be described.

Embodiment 4.
FIG. 37 is a cross-sectional view of a linear motor having an armature according to a fourth embodiment of the present invention. In the fourth embodiment, the same components as those of the first to third embodiments are designated by the same reference numerals, and the configurations different from those of the first to third embodiments will be mainly described. The linear motor 80, which is an electric motor, has an armature 81 and a field element 82 facing each other. In the fourth embodiment, the armature 81 is a mover and the field magnet 82 is a stator.

The armature 81 has an armature core 83, an insulator 6 that insulates the armature core 83, and a coil 7 that generates a magnetic field. The armature core 83 has a plurality of split cores 11 connected to each other. The armature core 83 has the same configuration as the stator core 5 of the first embodiment. The armature core 83 may have the same configuration as the stator core 5 of the second or third embodiment.

The field magnet 82 has a plate-shaped field core 84 and a plurality of permanent magnets 85 arranged on the field core 84. The linear motor 80 generates a magnetic field by flowing an electric current through the coil 7, and moves the armature 81 relative to the field magnet 82. The armature 81 moves in the direction in which the plurality of permanent magnets 85 are arranged. The linear motor 80 may have an armature 81 which is a stator and a field magnet 82 which is a mover.

In the armature core 83, the split iron core 11 includes a first portion 20a constituting the first groove portion 16a, a second portion 20b forming the second groove portion 16b, and the first portion 20a and the second portion 20a. Includes a third portion 20c provided between the portion 20b. The third portion 20c includes a surface 20c1 forming the end of the first groove 16a and a surface 20c2 forming the end of the second groove 16b. According to the third embodiment, the armature core 83 can manufacture the armature 81 with high productivity and has the armature 81, as in the case of the stator core 5 of the first embodiment. It has the effect of being able to achieve high electrical characteristics.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 motor, 2 stator, 3 rotor, 4 frame, 5 stator core, 6 insulator, 7 coil, 8 rotor core, 9 shaft, 10,85 permanent magnet, 11, 11a, 11b, 11c split iron core, 12 Yoke part, 13 teeth part, 14 connecting part, 15 outer peripheral surface, 16 groove part, 16a first groove part, 16b second groove part, 17 caulking part, 18, 19 end face, 20a first part, 20b second part , 20c 3rd part, 20c1, 20c2, 50 planes, 21 1st iron core piece group, 22 2nd iron core piece group, 23 3rd iron core piece group, 24, 61 4th iron core piece group, 25, 62 Fifth iron core piece group, 26,28 holes, 27,29,48,66 protrusions, 30,75 gaps, 31 first iron core piece, 32 second iron core piece, 33 third iron core piece, 34 , 64 4th iron core piece, 35,65 5th iron core piece, 36,37 end, 38,63 notch, 40 nozzles, 41 wire rod, 42,44 inner claw, 43,45 outer claw, 46, 47 jig, 49 fitting part, 50a area, 51, 52, 53, 54 square, 60 third groove part, 70 thickness, 71, 74 intervals, 72 lower end, 73 upper end, 80 linear motor, 81 armature, 82 Field magnet, 83 armature core, 84 field core.

Claims (10)

An armature core in which each of the divided iron cores is a laminated body of a plurality of iron core pieces, and the plurality of divided iron cores are connected to each other.
Each of the plurality of divided iron cores has a yoke portion and a teeth portion protruding from the yoke portion in a second direction perpendicular to the first direction, which is the direction in which the plurality of iron core pieces are laminated. And
On the second surface of the yoke portion opposite to the first surface on which the teeth portion is provided, a first groove portion and a second groove portion, each of which is recessed in the second direction, are formed. It is provided,
The laminated body includes a first portion constituting the first groove portion, a second portion constituting the second groove portion, and the first portion and the second portion in the first direction. Including the third part provided between and
The third portion includes a surface forming the end of the first groove portion in the first direction and a surface forming the end of the second groove portion in the first direction.
A third groove portion recessed in the second direction is provided between the first groove portion and the second groove portion of the second surface.
The width of the third groove in the third direction perpendicular to the first direction and the second direction is smaller than the width of the first groove in the third direction, and the width of the third groove is smaller than the width of the first groove in the third direction. An armature iron core characterized in that it is smaller than the width of the groove portion 2 in the third direction. The iron core piece constituting the first portion has a notch portion forming the first groove portion, and has a notch portion.
The armature core according to claim 1, wherein the armature piece constituting the second portion has a notch portion forming the second groove portion. The first portion is one end of the laminate in the first direction.
The armature core according to claim 1 or 2, wherein the second portion is the other end portion of the laminated body in the first direction. The invention according to any one of claims 1 to 3, wherein the length of the first groove portion in the first direction is longer than the length of the first groove portion in the first direction. Armature iron core. The armature core according to any one of claims 1 to 4, wherein the third portion is a central portion of the laminated body in the first direction. The armature core according to any one of claims 1 to 5, wherein the iron core piece constituting the third portion has a notch portion forming the third groove portion. The first groove is a shape having a portion that is enlarged according to the width in the front Symbol third direction is directed from said second surface toward said tooth portions,
Claims 1 to 6 are characterized in that the second groove portion has a portion in which the width in the third direction is expanded from the second surface toward the teeth portion. The armature iron core described in any one of the above. Said first groove portion and the second groove, of the second surface, that any one of claims 1 to 7, characterized in that provided in the central portion before Symbol third direction Armature iron core described in. An armature comprising the armature iron core according to any one of claims 1 to 8. The armature according to claim 9 and
An electric motor characterized by being equipped with a field magnet.