CN114424430A - Armature core, armature, and motor - Google Patents

Abstract

A stator core (5) as an armature core has a plurality of divided cores (11) each being a laminated body of a plurality of core pieces. Each of the plurality of divided cores (11) has a yoke (12) and a tooth (13) protruding from the yoke (12) in a 2 nd direction perpendicular to the 1 st direction. A1 st groove part (16a) and a 2 nd groove part (16b) which are recessed in a 2 nd direction are provided on an outer peripheral surface (15) which is a 2 nd surface of the yoke part (12) and is opposite to the 1 st surface. The laminate includes a 1 st portion constituting a 1 st groove portion (16a), a 2 nd portion constituting a 2 nd groove portion (16b), and a 3 rd portion provided between the 1 st portion and the 2 nd portion in the 1 st direction. The 3 rd portion includes a surface constituting the 1 st direction end of the 1 st groove portion (16a) and a surface constituting the 1 st direction end of the 2 nd groove portion (16 b).

Description

Armature core, armature, and motor

Technical Field

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

Background

Conventionally, an armature core is known which is formed by annularly connecting a plurality of divided cores. Each of the divided cores is formed by laminating a plurality of core sheets, which are electromagnetic steel sheets. The divided core has a yoke portion through which magnetic flux passes and a tooth portion protruding from the yoke portion. In the tooth portion, the wire rod is wound after the insulator is provided, thereby forming a coil.

The winding of the wire rod is performed in a state where the divided core, which is the object of winding, is held by a jig. In order to accurately wind the wire material around the divided cores, it is required that the divided cores be accurately positioned and stably held against the tension applied to the wire material.

Patent document 1 discloses that in an armature core having a plurality of divided cores connected in an annular shape, a groove portion is provided on an outer peripheral surface of each of the divided cores. The outer peripheral surface of the divided core is a surface of the yoke portion facing the side opposite to the side where the tooth portions protrude. The slot portion is formed in a central portion in the circumferential direction among the yoke portions so as to extend in the stacking direction. The groove portion serves as a reference for positioning when the wire rod is wound. The jig is provided with a fitting portion that can be fitted into the groove portion. The fitting portion is fitted to the groove portion in a state where the divided core is held by the jig, whereby the divided core can be accurately positioned and stably held. The armature can be manufactured with high productivity by reducing the occurrence of defects in the winding of the wire material by accurately winding the wire material around the divided cores.

Patent document 1: japanese patent laid-open publication No. 2005-110464

Disclosure of Invention

The yoke portion provided with the slot portion has a volume smaller than that of the yoke portion in the case where the slot portion is not provided. The smaller the volume of the yoke portion, the smaller the magnetic flux that can pass through the yoke portion, and thus the smaller the torque that can be output by the motor having the armature core. In this case, even if the electric current flowing to the electric motor is increased, the torque that can be output cannot be increased, and high electrical characteristics cannot be obtained. Therefore, it is desirable to suppress the volume reduction of the yoke portion as much as possible.

In the case of the conventional technique disclosed in patent document 1, the slot portion is formed in the entire yoke portion in the stacking direction, whereby the volume of the yoke portion is significantly reduced. Further, 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 becomes, the more difficult the stable holding of the divided core in the jig becomes. Further, the smaller the width of the groove portion in the circumferential direction, the more difficult it becomes to fit the fitting portion into the groove portion, and therefore the work efficiency when the split core is attached to the jig becomes worse. Further, the smaller the width of the groove portion, the more difficult the production of the core piece becomes. Therefore, it is difficult to increase the volume of the yoke by reducing the width of the groove portion in the circumferential direction. As described above, according to the conventional art, there is a problem that the armature can be manufactured with high productivity, and on the other hand, it becomes difficult to realize high electrical characteristics by reducing the volume of the yoke portion.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an armature core that can manufacture an armature with high productivity and can realize high electrical characteristics in a motor having the armature.

In order to solve the above-described problems and achieve the object, an armature core according to the present invention includes a plurality of divided cores each of which is a laminated body of a plurality of core pieces, and the plurality of divided cores are connected to each other. Each of the plurality of divided cores has a yoke portion and a tooth portion protruding from the yoke portion in a 2 nd direction perpendicular to a 1 st direction in which the plurality of core segments are stacked. A1 st groove portion and a 2 nd groove portion each recessed in a 2 nd direction are provided on a 2 nd surface of the yoke portion opposite to the 1 st surface on which the tooth portion is provided. The laminate includes a 1 st portion constituting a 1 st groove portion, a 2 nd portion constituting a 2 nd groove portion, and a 3 rd portion disposed between the 1 st portion and the 2 nd portion in the 1 st direction. The 3 rd portion includes a surface constituting the 1 st direction end of the 1 st groove portion and a surface constituting the 1 st direction end of the 2 nd groove portion.

ADVANTAGEOUS EFFECTS OF INVENTION

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

Drawings

Fig. 1 is a sectional view of a motor including a stator according to embodiment 1 of the present invention.

Fig. 2 is a perspective view of a stator core constituting a stator according to embodiment 1.

Fig. 3 is a view showing a cross section of the stator core at the III-III line shown in fig. 2.

Fig. 4 is a cross-sectional view of the stator core taken along line IV-IV shown in fig. 2.

Fig. 5 is a plan view showing the 1 st to 5 th core segment groups shown in fig. 3 and 4.

Fig. 6 is a view showing the cross-sectional structure of the 1 st to 5 th core segment groups shown in fig. 3 and 4.

Fig. 7 is a diagram showing the structure of a vertical cross section of the 1 st to 5 th core segment groups shown in fig. 3 and 4.

Fig. 8 is a view showing a state in which a wire material is wound around a divided core constituting the stator core shown in fig. 2.

Fig. 9 is a diagram for explaining winding of the wire rod into the divided core shown in fig. 8.

Fig. 10 is a view 1 showing a state where the divided cores shown in fig. 8 are held by the holding mechanism.

Fig. 11 is a view 2 showing a state where the divided cores shown in fig. 8 are held by the holding mechanism.

Fig. 12 is a perspective view showing a jig constituting the holding mechanism shown in fig. 11.

Fig. 13 is a perspective view showing a state in which a core segment is fitted in the jig shown in fig. 12.

Fig. 14 is a perspective view showing a stator core constituting a stator according to embodiment 2 of the present invention.

Fig. 15 is a plan view of a divided core constituting the stator core shown in fig. 14.

Fig. 16 is a cross-sectional view of the stator core shown in fig. 14.

Fig. 17 is a vertical cross-section of the stator core shown in fig. 14.

Fig. 18 is a view showing a planar structure of the 1 st to 5 th core segment groups shown in fig. 16 and 17.

Fig. 19 is a view showing the structure of a vertical cross section of the 1 st to 5 th core segment groups shown in fig. 16 and 17.

Fig. 20 is a view showing a state where the divided cores shown in fig. 14 are conveyed.

Fig. 21 is a view showing a state in which the wire rod is being wound around the divided core shown in fig. 14.

FIG. 22 is an enlarged view of a portion including the 3 rd groove and the fitting portion in the structure shown in FIG. 21.

Fig. 23 is a view showing a state in which the divided cores shown in fig. 20 are sandwiched by the conveyance mechanism.

Fig. 24 is a sectional view of a divided core constituting a stator according to embodiment 3 of the present invention.

Fig. 25 is a diagram showing a 1 st configuration example of a divided core in embodiment 3.

Fig. 26 is a view showing a state where the divided cores shown in fig. 25 are held by the holding mechanism.

Fig. 27 is a view showing a 2 nd configuration example of a divided core in embodiment 3.

Fig. 28 is a view showing a state in which the length in the 1 st direction is adjusted with respect to the divided core shown in fig. 27.

Fig. 29 is a view showing a state in which the adjusted divided cores shown in fig. 28 are held by the holding mechanism.

Fig. 30 is a view showing a divided core according to comparative example 1 of embodiment 3.

Fig. 31 is a view showing a state where the divided cores shown in fig. 30 are held by the holding mechanism.

Fig. 32 is a view showing a divided core according to comparative example 2 of embodiment 3.

Fig. 33 is a view showing a state where the divided cores shown in fig. 32 are held by the holding mechanism.

Fig. 34 is a view showing a divided core according to comparative example 3 of embodiment 3.

Fig. 35 is a view showing a state in which the length in the 1 st direction is adjusted with respect to the divided core shown in fig. 34.

Fig. 36 is a view showing a state where the adjusted divided cores shown in fig. 35 are held by the holding mechanism.

Fig. 37 is a sectional view of a linear motor including an armature according to embodiment 4 of the present invention.

Detailed Description

Hereinafter, an armature core, an armature, and a motor according to embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the present embodiment. In the drawings described below, a shadow may be attached to a plan view and a shadow may not be attached to a cross-sectional view in order to make the drawings easy to see.

Embodiment 1.

Fig. 1 is a sectional view of a motor including a stator according to embodiment 1 of the present invention. The motor 1 includes: a stator 2 which is an armature; a rotor 3 which is a field element surrounded by the stator 2 and is 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 for insulating the stator core 5; and a coil 7 for generating 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 that is an excitation element 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 section shown in fig. 1 is a section perpendicular to the axis C. In the following description, the direction of the axis C is sometimes referred to as an axial direction, the direction along the circumference of a circle centered on the axis C is sometimes referred to as a circumferential direction, and the direction along the diameter of a circle centered on the axis C is sometimes referred to as a radial direction. The plurality of permanent magnets 10 are arranged in the circumferential direction.

The motor 1 includes: a bearing that rotatably holds the shaft 9; and a bracket embedded in the bearing. The frame 4 covers the periphery of the stator 2 and holds the rotor 3 via a bearing and a bracket. The illustration of the bearings and the bracket is omitted.

The stator core 5 includes a plurality of divided cores 11 connected to each other. The plurality of divided cores 11 are arranged in the circumferential direction. Each of the plurality of divided cores 11 is a laminated body of a plurality of core pieces. Each of the plurality of core segments is an electromagnetic steel sheet. The plurality of core segments are stacked on each other in the axial direction, i.e., the 1 st direction.

The divided core 11 has a yoke 12 and a tooth 13 protruding from the yoke 12. The tooth portion 13 protrudes from the yoke portion 12 toward the axis C in the radial direction. The end portion on the axial line C side in the radial direction among the teeth 13 is expanded in the circumferential direction than the portion other than the end portion among the teeth 13. The teeth 13 adjacent to each other in the circumferential direction form a slot, which is a space for arranging the coil 7. The insulator 6 covers the inner circumferential surface of the yoke 12, which is the 1 st surface on which the tooth portions 13 are provided, and the side surfaces of the tooth portions 13 facing the circumferential direction.

The divided cores 11 adjacent to each other in the circumferential direction are rotatably coupled to each other by a coupling portion 14 provided at an end portion in the circumferential direction among the yoke portions 12. The outer peripheral surface 15 of the divided core 11 is the 2 nd surface of the yoke 12 opposite to the inner peripheral surface on which the tooth portions 13 are provided. The outer circumferential surface 15 is provided with a groove portion 16. The laminated core segments are fixed to each other at the caulking portions 17. The split core 11 is provided with a caulking portion 17 at 3. The number of the caulking portions 17 in the divided core 11 and the position of the caulking portions 17 in the divided core 11 can be changed as appropriate.

Fig. 2 is a perspective view of a stator core constituting a stator according to embodiment 1. In fig. 2, an arrow D1 indicates the 1 st direction described above. The 1 st direction is a direction in which a plurality of core segments are laminated in each of the divided cores 11. Arrow D2 represents the 2 nd direction perpendicular to the 1 st direction. Arrow D3 represents the 3 rd direction perpendicular to the 1 st and 2 nd directions. The tooth portion 13 protrudes from the yoke portion 12 in the 2 nd direction.

When the stator core 5 is detached from the motor 1, the stator core 5 can be deformed by the rotation of the divided cores 11 in the respective coupling portions 14. Fig. 2 shows the stator core 5 in a state of being linearly developed.

When the stator core 5 is annular as shown in fig. 1, an end surface 18 of the divided core 11 positioned at one end in the 3 rd direction among the plurality of divided cores 11 constituting the stator core 5 is in contact with an end surface 19 of the divided core 11 positioned at the other end in the 3 rd direction among the plurality of divided cores 11. From the state shown in fig. 2, the stator core 5 is deformed so that the end surfaces 18 and 19 come into contact with each other, whereby the stator core 5 is annular.

Each of the divided cores 11 has 2 groove portions 16 on the outer peripheral surface 15. The 1 st groove portion 16a is a groove portion 16 provided on one end side in the 1 st direction among the outer circumferential surface 15. The 2 nd groove portion 16b is a groove portion 16 provided on the other end side in the 1 st direction among the outer circumferential surface 15. The 1 st groove portion 16a and the 2 nd groove portion 16b are each recessed in the 2 nd direction. In fig. 2, the end of the divided core 11 on the side where the 1 st groove 16a is provided may be referred to as a lower end, and the end of the divided core 11 on the side where the 2 nd groove 16b is provided may be referred to as an upper end.

The 1 st groove portion 16a and the 2 nd groove portion 16b are provided in the central portion in the 3 rd direction among the outer peripheral surface 15. The groove portion 16 is not provided in the center portion in the 1 st direction among the outer circumferential surface 15. The 1 st groove portion 16a and the 2 nd groove portion 16b are disposed 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, being interposed therebetween. As described above, the groove portion 16 is provided in the outer circumferential surface 15 at a portion other than the central portion in the 1 st direction.

The split core 11, which is a laminated body of core pieces, includes: the 1 st part, which constitutes the 1 st groove part 16 a; a 2 nd portion constituting a 2 nd groove portion 16 b; and a 3 rd portion disposed between the 1 st portion and the 2 nd portion in the 1 st direction. The 1 st part is a laminated body of core pieces constituting the 1 st groove portion 16a among a plurality of core pieces constituting the divided core 11, and includes the lower end of the divided core 11. The 2 nd part is a laminated body of core pieces constituting the 2 nd groove portions 16b among the plurality of core pieces constituting the divided core 11, and includes the upper end of the divided core 11. The portion 3 is a laminated body of core pieces other than the core piece constituting the 1 st slot portion 16a and the core piece constituting the 2 nd slot portion 16b among the plurality of core pieces constituting the divided core 11, and constitutes the central portion described above.

Fig. 3 is a view showing a cross section of the stator core at the III-III line shown in fig. 2. Fig. 4 is a cross-sectional view of the stator core taken along line IV-IV shown in fig. 2. The cross section shown in fig. 3 is a cross section parallel to the 1 st direction and the 3 rd direction, and is a cross section of the yoke portions 12 connected to each other. The cross section shown in fig. 4 is a cross section parallel to the 1 st direction and the 2 nd direction, and is a vertical cross section of the yoke 12 and the tooth 13. In the following description, the right and left sides are the right and left sides when the stator core 5 is developed linearly as shown in fig. 2 as viewed from the tooth portion 13 side. 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 structure shown in fig. 3 and 4 is an example of the structure of the stator core 5.

Here, the plurality of core segments arranged in the 3 rd direction are referred to as a core segment group. The plurality of core segment groups constituting the stator core 5 include 1 st to 5 th core segment groups 21, 22, 23, 24, 25. The 1 st core segment 31 is a core segment constituting the 1 st core segment group 21. The 2 nd core segment 32 is a core segment constituting the 2 nd core segment group 22. The 3 rd core segment 33 is a core segment constituting the 3 rd core segment group 23. The 4 th core segment 34 is a core segment constituting the 4 th core segment group 24. The 5 th core segment 35 is a core segment constituting the 5 th core segment group 25. The 1 st core segment 31, the 2 nd core segment 32, the 3 rd core segment 33, the 4 th core segment 34 and the 5 th core segment 35 have different configurations from each other.

In the example shown in fig. 3 and 4, the divided core 11 is a laminated body composed of 18 core pieces. The 18 core segments include 1 st core segment 31, 6 nd 2 core segments 32, 5 rd core segments 33, 3 th 4 core segments 34, and 3 th 5 core segments 35.

The 1 st core segment 31 is provided at the lower end of the divided core 11. On the 1 st core segment 31, the 2 nd core segment 32, the 3 rd core segment 33, the 4 th core segment 34, and the 5 th core segment 35 are laminated in the order determined based on the structure of each core segment. The 2 nd core segment 32 is provided at the upper end of the divided core 11.

The 1 st core segment 31 has a hole 26. The 2 nd core piece 32, the 3 rd core piece 33, the 4 th core piece 34, and the 5 th core piece 35 each have the boss 27. The hole 26 and the boss 27 constitute the coupling portion 14.

The boss 27 causes a circular portion of the core segment to bulge. A circular recess is formed in the back surface side of the portion of the core segment where the boss 27 is provided. The 2 nd core segment 32, the 3 rd core segment 33, the 4 th core segment 34, and the 5 th core segment 35 are laminated in a state in which the boss portion 27 faces downward. The hole 26 is circular and is formed so that the boss 27 can be fitted therein. The boss 27 provided on the 2 nd core segment 32 laminated on the 1 st core segment 31 is fitted into the hole 26. The boss 27 is rotatable in a state of being fitted into the hole 26. In each of the core pieces other than the 1 st core piece 31, the projection 27 provided on the upper core piece among the 2 core pieces stacked one on another is fitted into the recess provided on the lower core piece. The boss 27 is rotatable in a state of being fitted into the recess.

In each core segment group, a gap 30 is provided between 2 core segments adjacent to each other. In the 1 st core segment group 21, the gap 30 provided between the 21 st core segments 31 adjacent to each other is positioned on the right side of the connecting portion 14. In the 2 nd core segment group 22, the gap 30 provided between the 2 nd core segments 32 adjacent to each other is positioned on the left side of the coupling portion 14. In the 3 rd core segment group 23, the gap 30 provided between the 23 rd core segments 33 adjacent to each other is positioned on the right side of the connection portion 14. In the 4 th core segment group 24, the gap 30 provided between the 24 th core segments 34 adjacent to each other is positioned on the left side of the coupling portion 14. In the 5 th core segment group 25, the gap 30 provided between the 25 th core segments 35 adjacent to each other is positioned on the right side of the connection portion 14. In the stator core 5, the core segment groups provided with the gaps 30 on the right side of the connecting portion 14 and the core segment groups provided with the gaps 30 on the left side of the connecting portion 14 are alternately stacked.

In the 1 st core segment 21, the hole 26 is provided in the 1 st core segment 31 on the left side among the 21 st core segments 31 adjacent to each other. In the 2 nd core segment group 22, the boss 27 is provided in the 2 nd core segment 32 on the right side among the 2 nd core segments 32 adjacent to each other. In the 3 rd core segment group 23, the boss 27 is provided on the 3 rd core segment 33 on the left side among the 23 rd core segments 33 adjacent to each other. In the 4 th core segment group 24, the boss 27 is provided on the 4 th core segment 34 on the right side among the 24 th core segments 34 adjacent to each other. In the 5 th core segment group 25, the 5 th core segment 35 on the left side among the 25 th core segments 35 adjacent to each other is provided.

The 1 st core segment 31 has the hole 28. The 2 nd core piece 32, the 3 rd core piece 33, the 4 th core piece 34, and the 5 th core piece 35 each have the boss 29. The hole 28 and the boss 29 constitute the rivet 17.

The boss 29 bulges a rectangular portion of the core segment. A rectangular recess is formed in the back surface side of the portion of the core segment where the boss 29 is provided. The 2 nd core segment 32, the 3 rd core segment 33, the 4 th core segment 34, and the 5 th core segment 35 are laminated in a state where the boss 29 is directed downward. The hole 28 is rectangular in shape into which the boss 29 can enter. The boss 29 provided on the 2 nd core segment 32 laminated on the 1 st core segment 31 is fitted into the hole 28 and fastened to the hole 28. In each of the core segments other than the 1 st core segment 31, the projection 29 provided on the upper core segment among the 2 core segments stacked on each other is fastened to the recess in a state of entering the recess provided on the lower core segment.

As shown in fig. 4, the 1 st segment 20a constituting the 1 st groove portion 16a is a laminated body of 5 core pieces. In the 1 st part 20a, the 2 nd core piece 32 and the 3 rd core piece 33 are alternately laminated on the 1 st core piece 31. The 2 nd portion 20b constituting the 2 nd groove portion 16b is a laminated body of 7 core pieces. The 2 nd core segment 32 and the 3 rd core segment 33 are alternately stacked in the 2 nd portion 20 b. The 3 rd portion 20c where the groove portion 16 is not provided is a laminated body of 6 core pieces. In the 3 rd portion 20c, the 4 th core piece 34 and the 5 th core piece 35 are alternately laminated. The 1 st part 20a is a lower end portion of the divided core 11, i.e., the laminated body, i.e., one end portion in the 1 st direction among the divided cores 11. The 2 nd portion 20b is an upper end portion of the divided core 11, i.e., the laminated body, i.e., the other end portion in the 1 st direction among the divided cores 11. The 3 rd portion 20c is a central portion in the 1 st direction in the divided core 11, i.e., the laminated body. The 3 rd portion 20c is stacked on the 1 st portion 20 a. The 2 nd portion 20b is stacked on the 3 rd portion 20 c.

The surface 20c1, which is the lower end of the 3 rd portion 20c, constitutes the upper end surface of the 1 st groove 16 a. The upper end of the 3 rd portion 20c, i.e., the face 20c2, constitutes the lower end of the 2 nd groove portion 16 b. As described above, the 3 rd portion 20c includes the face 20c1 constituting the end of the 1 st groove part 16a in the 1 st direction and the face 20c2 constituting the end of the 2 nd groove part 16b in the 1 st direction. The groove 16 is not provided between the surface 20c1 and the surface 20c 2.

Fig. 5 is a plan view showing the 1 st to 5 th core segment groups shown in fig. 3 and 4. Fig. 6 is a view showing the cross-sectional structure of the 1 st to 5 th core segment groups shown in fig. 3 and 4. Fig. 7 is a diagram showing the structure of a vertical cross section of the 1 st to 5 th core segment groups shown in fig. 3 and 4.

Fig. 5 shows 4 of the 12 1 st core segments 31 constituting the 1 st core segment group 21, 4 of the 12 2 nd core segments 32 constituting the 2 nd core segment group 22, 4 of the 12 3 rd core segments 33 constituting the 3 rd core segment group 23, 4 of the 12 4 th core segments 34 constituting the 4 th core segment group 24, and 4 of the 12 5 th core segments 35 constituting the 5 th core segment group 25. In fig. 6 the same cross section as in fig. 3 is shown. Fig. 7 shows the same longitudinal section as fig. 4.

The hole 26 is provided in each 1 st core segment 31 except for 1 st core segment 31 constituting the end surface 18 among the 1 st core segments 31 constituting the 1 st core segment group 21. In the 1 st core segment 31, the hole 26 is provided at the left end 36 among the yoke portions 12. Each of 1 st core segment 31 constituting 1 st core segment group 21 is provided with 3 holes 28 and notches 38 constituting groove portions 16.

The boss 27 is provided in each 2 nd core segment 32 except for 12 nd core segment 32 constituting the end face 19 among the 2 nd core segments 32 constituting the 2 nd core segment group 22. In the 2 nd core segment 32, the boss portion 27 is provided at the right end portion 37 of the yoke portion 12. Each of the 2 nd core pieces 32 constituting the 2 nd core piece group 22 is provided with 3 projections 29 and notches 38 constituting the groove portions 16.

The boss 27 is provided in each 3 rd core segment 33 except for 13 rd core segment 33 constituting the end face 18 among the 3 rd core segments 33 constituting the 3 rd core segment group 23. In the 3 rd core segment 33, the boss portion 27 is provided at the left end portion 36 among the yoke portion 12. Each of the 3 rd core pieces 33 constituting the 3 rd core piece group 23 is provided with 3 projections 29 and notches 38 constituting the groove portions 16.

The boss 27 is provided in each 4 th core segment 34 except for 14 th core segment 34 constituting the end face 19 among the 4 th core segments 34 constituting the 4 th core segment group 24. In the 4 th core segment 34, the boss portion 27 is provided at the right end portion 37 of the yoke portion 12. Each of the 4 th core segments 34 constituting the 4 th core segment group 24 is provided with 3 projections 29. The 4 th core segment 34 is not provided with the notch portion 38.

The boss 27 is provided in each of the 5 th core segments 35, excluding the 15 th core segment 35 constituting the end face 18, among the 5 th core segments 35 constituting the 5 th core segment group 25. In the 5 th core segment 35, the boss 27 is provided at the left end 36 of the yoke portion 12. Each of the 5 th core segments 35 constituting the 5 th core segment group 25 is provided with 3 projections 29. The 5 th core segment 35 is not provided with the notch portion 38.

In fig. 5, the outer shape of the 1 st core segment 31 is the same as that of the 2 nd core segment 32 except for the shapes of the end portions 36, 37. The 1 st core segment 31 has the same outer shape as the 3 rd core segment 33. The outer shape of the 2 nd core piece 32 is the same as that of the 4 th core piece 34 except that the cutout portion 38 is provided. The 1 st core segment 31 has the same outer shape as the 5 th core segment 35 except for the cut-out portion 38. As described above, the 1 st to 5 th core segments 31, 32, 33, 34, 35 are each the same shape as each other except that at least one of the portions of the end portions 36, 37 and the portions of the cutout portions 38 is different from each other. In addition, the 1 st to 5 th core segments 31, 32, 33, 34, 35 are each formed to have the same size. By laminating the 1 st to 5 th core segments 31, 32, 33, 34, and 35 as described above, the divided core 11 can reduce the irregularities that reduce the volume of the divided core 11. Accordingly, the stator core 5 can pass as much magnetic flux as possible in the portions other than the portions where the groove portions 16 are provided, and can increase the torque that can be output by the motor 1.

The core pieces constituting the 1 st portion 20a are formed with notches 38 of the same shape at the same positions, and the ridge portions constituting the outer peripheral surface 15 are of the same shape in the outer shape of the core pieces. The core pieces constituting the 2 nd portion 20b are formed with notches 38 having the same shape at the same positions, and the ridge portions constituting the outer peripheral surface 15 are the same shape in the outer shape of the core pieces. The core pieces constituting the 3 rd portion 20c are not provided with the notch portions 38, and the ridge line portions constituting the outer peripheral surface 15 are all the same shape in the outer shape of the core pieces.

The divided cores 11 are not limited to the core segment having the boss 27 at the end 36 and the core segment having the boss 27 at the end 37 being alternately stacked. The divided core 11 may include a portion in which core pieces having the boss 27 at the end 36 are stacked, or may include a portion in which core pieces having the boss 27 at the end 37 are stacked.

The groove portion 16 is used to fix the position of the divided core 11 in a holding mechanism that holds the divided core 11 when the magnetic wire, which is a wire rod, is wound around the divided core 11. Fig. 8 is a view showing a state in which a wire material is wound around a divided core constituting the stator core shown in fig. 2. A winder is used to wind the wire rod 41 around the divided core 11. The winding machine turns the nozzle 40 for supplying the wire material 41 around the divided cores 11, thereby winding the wire material 41 around the tooth portions 13 of the divided cores 11.

Fig. 8 shows a jig 46 constituting a holding mechanism. When the wire material 41 is wound around the divided cores 11, 1 divided core 11 is held by the holding mechanism. The stator core 5 is bent between the divided core 11 held by the holding mechanism and the divided core 11 adjacent to the divided core 11. This ensures a space for rotating the nozzle 40 around the divided core 11 held by the holding mechanism.

The inner claws 42 and 43 and the inner claws 44 and 45 constitute a conveying mechanism for conveying the divided cores 11. The inner claws 44 and the outer claws 45 convey the divided cores 11 put into the holding mechanism. The inner claws 42 and the outer claws 43 convey the divided cores 11 discharged from the holding mechanism. The divided cores 11 before being wound with the wire rod 41 are arranged in a row while being sandwiched between the inner claws 44 and the outer claws 45 facing each other. The divided cores 11 around which 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 into the divided core shown in fig. 8. Fig. 9 shows a state in which the nozzle 40 is rotated in a section taken along line IX-IX in fig. 8. In fig. 9, the nozzle 40 is rotated counterclockwise about the tooth 13.

While the nozzle 40 is rotated from the position P1 to the position P2, the tension applied to the wire 41 acts on the right corner 51 among the lower ends of the tooth portions 13. The direction of the tension acting on the corner 51 gradually changes from the direction of arrow F1 to the direction of arrow F2, as shown in fig. 9.

While the nozzle 40 is rotated from the position P2 to the position P3, the tension applied to the wire 41 acts on the right corner 52 among the upper ends of the tooth portions 13. The direction of the tension acting on the corner 52 gradually changes from the direction of arrow F2 to the direction of arrow F3, as shown in fig. 9.

While the nozzle 40 is rotated from the position P3 to the position P4, the tension applied to the wire 41 acts on the left corner 53 among the upper ends of the tooth portions 13. The direction of the tension acting on the corner 53 gradually changes from the direction of arrow F3 to the direction of arrow F4, as shown in fig. 9.

While the nozzle 40 is rotated from the position P4 to the position P1, the tension applied to the wire 41 acts on the left corner 54 among the lower ends of the tooth portions 13. The direction of the tensile force acting on the corner 54 gradually changes from the direction of arrow F4 to the direction of arrow F1, as shown in fig. 9.

As described above, when the wire rod 41 is wound around the divided core 11, the tension of the wire rod 41 acts on the 1 st core piece 31 constituting the lower end of the divided core 11 and the 2 nd core piece 32 constituting the upper end of the divided core 11, respectively. The groove 16 is provided in the 1 st portion 20a including the lower end of the divided core 11 and the 2 nd portion 20b including the upper end of the divided core 11. The holding mechanism can hold the divided core 11 at the 1 st segment 20a, which is the upper end, and the 2 nd segment 20b, which is the lower end. The groove portion 16 is not provided in the 3 rd portion 20c which is the central portion of the divided core 11. The stator core 5 can use the center portion of the divided core 11 to improve torque characteristics.

Fig. 10 is a view 1 showing a state where the divided cores shown in fig. 8 are held by the holding mechanism. Fig. 10 shows a cross section at the X-X line shown in fig. 8. The holding mechanism has 2 clamps 46, 47 opposite to each other. The holding mechanism holds the divided cores 11 by clamping the divided cores 11 by 2 clamps 46 and 47. The jig 46 is in contact with the 2 nd core segment 32 constituting the upper end among the divided cores 11. The jig 47 contacts the 1 st core segment 31 constituting the lower end of the divided core 11.

A projection 48 is provided on a surface of the jig 46 facing the jig 47. In the jig 47, similarly to the jig 46, a boss 48 is provided on a surface facing the jig 46. The projection 48 provided on the jig 46 and the projection 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 in a direction approaching the jig 46 and a direction away from the jig 46. The holding mechanism holds the divided cores 11 by moving the jig 46 and the jig 47 so that the jig 46 and the jig 47 approach each other in a state where the divided cores 11 are provided between the jig 46 and the jig 47. The holding mechanism moves the jig 46 and the jig 47 in a direction to move away from each other from the state where the divided cores 11 are held, and thereby releases the gripped divided cores 11.

Fig. 11 is a view 2 showing a state where the divided cores shown in fig. 8 are held by the holding mechanism. Fig. 11 shows a cross section at line XI-XI shown in fig. 10. Fig. 11 shows a state in which the fitting portion 49 of the jig 47 is fitted into the 1 st groove portion 16a of the divided core 11 held by the holding mechanism. The fitting portion 49 of the jig 46 is fitted into the 2 nd groove portion 16b of the divided core 11 held by the holding mechanism, as in the case shown in fig. 11.

In the cross section shown in FIG. 11, the 1 st groove portion 16a has a so-called dovetail shape. The width of the 1 st groove portion 16a in the 3 rd direction increases from the outer peripheral surface 15 toward the tooth portion 13. The fitting portion 49 is an end portion of the protrusion 48 on the side contacting the divided core 11, and is a portion projecting leftward and rightward in accordance with the shape of the 1 st groove portion 16 a. The 1 st groove portion 16a may have any shape as long as it has a portion whose width in the 3 rd direction increases from the outer peripheral surface 15 toward the tooth portion 13.

Fig. 12 is a perspective view showing a jig constituting the holding mechanism shown in fig. 11. Fig. 13 is a perspective view showing a state in which a core segment is fitted in the jig shown in fig. 12. In the jig 47 shown in fig. 12, the length of the convex portion 48 in the direction perpendicular to the surface 50 facing the jig 46 is La. The length of the 1 st groove portion 16a in the 1 st direction is longer than La.

Fig. 13 shows a state where the 1 st core segment 31 constituting the lower end of the divided core 11 is fitted into the jig 47. In a state where the holding mechanism holds the divided cores 11, regions 50a of the surface 50 located on the left and right of the fitting portion 49 are in contact with the 1 st core segment 31.

The 2 nd groove 16b has the same shape as the 1 st groove 16 a. The width of the 2 nd groove portion 16b in the 3 rd direction increases from the outer peripheral surface 15 toward the tooth portion 13. The 2 nd groove portion 16b may have any shape as long as it has a portion whose width in the 3 rd direction is increased from the outer peripheral surface 15 toward the tooth portion 13. The jig 46 shown in fig. 10 has the same configuration as the jig 47 shown in fig. 11 to 13. The manner in which the fitting portion 49 provided in the jig 46 is fitted into the 2 nd groove portion 16b is the same as the manner in which the fitting portion 49 provided in the jig 47 is fitted into the 1 st groove portion 16 a.

By configuring the groove portion 16 and the jigs 46 and 47 as described above, the fitting portion 49 is fitted into the groove portion 16 and the fitting portion 49 is removed from the groove portion 16 by moving the jigs 46 and 47 in a direction parallel to the 1 st direction with respect to the divided core 11. In addition, in a state where the fitting portion 49 is fitted into the groove portion 16, the divided cores 11 are prevented from moving in the 2 nd direction and the 3 rd direction with respect to the jigs 46 and 47.

The divided cores 11 to be held by the holding mechanism may include divided cores 11 having different lengths in the stacking direction. If the holding mechanism holds the divided cores 11 using 1 jig, the jig is replaced in accordance with the length of the divided cores 11 in the stacking direction. In embodiment 1, the holding mechanism holds the upper end and the lower end of the divided cores 11 using 2 jigs 46 and 47, and therefore, when holding the divided cores 11 having different lengths in the stacking direction, it is possible to use the common jigs 46 and 47. As described above, the holding mechanism can hold the divided cores 11 using the common jigs 46 and 47 when the lengths of the divided 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 divided core 11 on which the tension acts are fixed by the jigs 46 and 47, thereby further suppressing the movement of the divided core 11 due to the tension. Thus, the holding mechanism can accurately position the divided cores 11 and hold the divided cores 11. In addition, the holding mechanism can stably hold the divided cores 11.

The divided cores 11 can be accurately positioned and the divided cores 11 can be stably held, and thus the winding machine can accurately wind the wire rod 41 around the divided cores 11. The wire rod 41 can be accurately wound around the divided core 11, and thus the occurrence of defects in winding the wire rod 41 can be reduced, and the stator 2 can be manufactured with high productivity.

Further, since the groove portion 16 is not provided in the center portion in the 1 st direction among the yokes 12, the volume of the yokes 12 can be increased as compared with the case where the groove portion 16 is provided in the entire 1 st direction among the yokes 12. The more the volume of the yoke 12 increases, the more the magnetic flux that can pass through the yoke 12 increases, and thus the more the torque that can be output by the motor 1 increases. Therefore, the motor 1 can increase the current flowing to the motor 1, thereby increasing the torque that can be output, and obtaining high electrical characteristics.

According to embodiment 1, in the stator core 5, the divided core 11 includes the 1 st portion 20a constituting the 1 st slot portion 16a, the 2 nd portion 20b constituting the 2 nd slot portion 16b, and the 3 rd portion 20c provided between the 1 st portion 20a and the 2 nd portion 20 b. The 3 rd portion 20c includes a surface 20c1 constituting an end of the 1 st groove 16a and a surface 20c2 constituting an end of the 2 nd groove 16b, and the 3 rd portion 20c is not provided with the groove 16. Thus, the stator core 5 has an effect that the stator 2 can be manufactured with high productivity and high electrical characteristics can be realized in the motor having the stator 2.

Embodiment 2.

Fig. 14 is a perspective view of a stator core constituting a stator according to embodiment 2 of the present invention. In embodiment 2, the 3 rd groove portion 60 is provided in the outer peripheral surface 15 of each of the divided cores 11 constituting the stator core 5. In embodiment 2, the same components as those in embodiment 1 are denoted by the same reference numerals, and the description will be mainly given of a configuration different from that in embodiment 1.

The 3 rd groove portion 60 is provided at the center in the 3 rd direction among the outer peripheral surface 15. In addition, the 3 rd groove portion 60 is provided in the center portion in the 1 st direction among the outer peripheral surface 15. The 3 rd slot portion 60 is provided in the 3 rd portion between the 1 st portion provided with the 1 st slot portion 16a and the 2 nd portion provided with the 2 nd slot portion 16b in the divided core 11. The 3 rd portion is a laminated body of core pieces constituting the 3 rd slot portion 60 among the plurality of core pieces constituting the divided core 11.

Fig. 15 is a plan view of a divided core constituting the stator core shown in fig. 14. Fig. 15 shows a plane of the upper end side of the divided core 11. In the plane shown in fig. 15, the 3 rd groove portion 60 has a V-shape. The width of the 3 rd groove portion 60 in the 3 rd direction is smaller than the width of the 2 nd groove portion 16b in the 3 rd direction. The width of the 3 rd groove portion 60 in the 3 rd direction is smaller than the width of the 1 st groove portion 16a in the 3 rd direction. The shape of the 3 rd groove portion 60 is not limited to the V shape, and may be other than the V shape. The shape of the 3 rd groove portion 60 may be rectangular, semicircular, or the like.

Fig. 16 is a cross-sectional view of the stator core shown in fig. 14. Fig. 17 is a vertical cross-section of the stator core shown in fig. 14. In fig. 16, the same cross section as shown in fig. 3 is shown. Fig. 17 shows the same longitudinal section as that shown in fig. 4. In the stator core 5 according to embodiment 2, a 4 th core segment group 61 and a 5 th core segment group 62 are provided in place of the 4 th core segment group 24 and the 5 th core segment group 25 shown in fig. 3 and 4. The 4 th core segment 64 is a core segment constituting the 4 th core segment group 61. The 5 th core segment 65 is a core segment constituting the 5 th core segment group 62.

As shown in fig. 17, the 3 rd portion 20c constituting the 3 rd groove portion 60 is a laminated body of 6 core pieces. In the 3 rd portion 20c, the 4 th core piece 64 and the 5 th core piece 65 are alternately laminated. The depth of the 3 rd groove portion 60 in the 2 nd direction is shallower than the depth of the 1 st groove portion 16a in the 2 nd direction and shallower than the depth of the 2 nd groove portion 16b in the 2 nd direction. The 3 rd portion 20c includes a face 20c1 constituting the 1 st direction end of the 1 st groove portion 16a and a face 20c2 constituting the 1 st direction end of the 2 nd groove portion 16 b. Between the surface 20c1 and the surface 20c2, no groove having a depth equal to or greater than the depth of the 1 st groove 16a and the 2 nd groove 16b is provided.

Fig. 18 is a view showing a planar structure of the 1 st to 5 th core segment groups shown in fig. 16 and 17. Fig. 19 is a view showing the structure of a vertical cross section of the 1 st to 5 th core segment groups shown in fig. 16 and 17.

The 4 th core piece 64 constituting the 4 th core piece group 61 is provided with notches 63 constituting the 3 rd groove portions 60, respectively. Further, the 4 th core segment 64 is provided with the boss 27, similarly to the 4 th core segment 34 of embodiment 1. The 5 th core piece 65 constituting the 5 th core piece group 62 is provided with notches 63 constituting the 3 rd groove portions 60, respectively. In addition, the 5 th core segment 65 is provided with the boss 27, similarly to the 5 th core segment 35 of embodiment 1. The cross-sectional configurations of the 4 th and 5 th core segment groups 61 and 62 are the same as the cross-sectional configurations of the 4 th and 5 th core segment groups 24 and 25 shown in fig. 6.

The shapes of the 1 st to 5 th core segments 31, 32, 33, 64, 65 are the same as each other except that at least one of the shapes of the end portions 36, 37 and the shapes of the cutout portions 38, 63 are different from each other. In addition, the 1 st to 5 th core segments 31, 32, 33, 64, 65 are each formed in the same size. The core pieces constituting the 3 rd portion 20c are formed with notches 63 of the same shape at the same positions, and the ridge portions constituting the outer peripheral surface 15 are of the same shape in the outer shape of the core pieces.

The 3 rd groove portion 60 is used when the divided cores 11 put into the holding mechanism are conveyed and when the divided cores 11 discharged from the holding mechanism are conveyed. Fig. 20 is a view showing a state where the divided cores shown in fig. 14 are conveyed. In embodiment 2, the outer claws 45 and 43 are provided with the projecting portions 66 that can be fitted into the 3 rd groove portion 60. In fig. 20, in order to show the positional relationship of each element, when there is an element and an element disposed on the far side of the paper surface of the element, there is a portion where the element on the far side of the paper surface is seen through at the element on the near side of the paper surface.

While the wire rod 41 is being wound around the divided core 11, the conveying mechanism is in a posture in which the end of the inner claw 44 and the outer claw 45 on the side opposite to the jig 46 side is lifted upward, as in the case shown in fig. 8. Further, while the wire rod 41 is being wound around the divided core 11, the conveying mechanism is in a posture in which the end of the inner claw 42 and the outer claw 43 on the side opposite to the jig 46 side is lifted upward, as shown in fig. 8.

Fig. 21 is a view showing a state in which the wire rod is being wound around the divided core shown in fig. 14. FIG. 22 is an enlarged view of a portion including the 3 rd groove and the fitting portion in the structure shown in FIG. 21. Fig. 21 shows a plane of the upper surface side of the divided core 11. In fig. 21, the portion surrounded by the broken line shows a state where the fitting portion 49 is fitted in the 1 st groove portion 16a in the cross section of the divided core 11 and the boss portion 48. In fig. 22, a region XXII shown in fig. 21 is shown in an enlarged manner.

The boss 66 of the outer claw 45 is provided at a position facing the divided core 11 located at the end on the jig 47 side among the divided cores 11 sandwiched by the inner claw 44 and the outer claw 45. The protrusion 66 faces the 3 rd groove portion 60 provided in the divided core 11. The projection 66 has a convex shape that can be fitted into the 3 rd groove portion 60.

The outer pawl 43 shown in fig. 21 is also provided with a boss 66 similar to the boss 66 shown in fig. 22. The boss 66 of the outer claw 43 is provided at a position facing the divided core 11 located at the end on the jig 47 side among the divided cores 11 sandwiched by the inner claw 42 and the outer claw 43. The protrusion 66 faces the 3 rd groove portion 60 provided in the divided core 11. The projection 66 of the outer tab 43 is also convex so as to be fitted into the 3 rd groove portion 60.

When winding of the wire material 41 in 1 divided core 11 is completed, the transport mechanism changes the posture from the state shown in fig. 8 to linearly arrange the divided cores 11 sandwiched by the inner claws 44 and the outer claws 45, the divided cores 11 held by the holding mechanism, and the divided cores 11 sandwiched by the inner claws 42 and the outer claws 43 as shown in the 1 st stage from the top in fig. 20.

Next, as shown in the 2 nd stage from the top in fig. 20, the inner and outer claws 42 and 43 are moved toward away from each other. The inner claw 42 and the outer claw 43 are distant from the divided core 11 between the inner claw 42 and the outer claw 43. Then, the inner claws 42 and the outer claws 43 move until the bosses 66 reach above the divided cores 11a held by the holding mechanism.

Next, the inner jaw 42 and the outer jaw 43 are moved toward each other. As shown in the 3 rd stage from the top in fig. 20, the inner claw 42 and the outer claw 43 are in contact with the divided core 11 between the inner claw 42 and the outer claw 43.

Fig. 23 is a view showing a state in which the divided cores shown in fig. 20 are sandwiched by the conveyance mechanism. FIG. 23 shows a cross section perpendicular to the cross section shown in FIG. 21, and a cross section through which the 1 st groove 16a, the 2 nd groove 16b, and the 3 rd groove 60 pass. The boss 66 of the outer claw 43 is fitted into the 3 rd groove portion 60 of the divided core 11 held by the holding mechanism. Then, the holding mechanism moves the jig 46 and the jig 47 in a direction away from each other, thereby releasing the gripped divided cores 11.

After the holding mechanism releases the divided cores 11, the conveying mechanism moves the inner claws 42 and the outer claws 43 in a state where the divided cores 11 are sandwiched and the inner claws 44 and the outer claws 45 in a state where the divided cores 11 are sandwiched with respect to the jigs 46 and 47. By moving the inner claws 42 and the outer claws 43, the divided cores 11a held by the holding mechanism are discharged from the holding mechanism as shown in the 4 th stage from the top in fig. 20. Further, the inner claws 44 and the outer claws 45 move, and the divided core 11b wound next is thereby fed into the holding mechanism. The groove portion 16 of the divided core 11b put into the holding mechanism is positioned at the position of the fitting portion 49.

Then, the holding mechanism moves the jig 46 and the jig 47 so that the jig 46 and the jig 47 approach each other, thereby gripping the divided cores 11 b. The fitting portion 49 is fitted into the groove portion 16 of the divided core 11b put into the holding mechanism. Thereby, the holding mechanism holds the divided cores 11b put into the holding mechanism.

Next, the inner jaw 44 and the outer jaw 45 are moved toward away from each other. The inner claw 44 and the outer claw 45 are distant from the divided core 11 between the inner claw 44 and the outer claw 45. Then, the inner claws 44 and the outer claws 45 move until the boss portions 66 reach positions facing the divided cores 11c adjacent to the right side of the divided core 11b held by the holding mechanism. Then, the inner jaw 44 and the outer jaw 45 are moved toward each other. The inner claw 44 and the outer claw 45 are in contact with the divided core 11 between the inner claw 44 and the outer claw 45. The projection 66 of the outer leg 45 is fitted into the 3 rd groove portion 60 of the divided core 11 c.

Then, the conveyance mechanism returns to the same posture as that shown in fig. 8. The winder starts winding the wire rod 41 around the divided cores 11 held by the holding mechanism. The holding mechanism and the conveying mechanism repeat the above-described operations, thereby winding the wire rod 41 around each of the divided cores 11 of the stator core 5.

The holding mechanism holds the divided cores 11 by fitting the fitting portions 49 into the groove portions 16 in a state where the projection portions 66 of the outer claws 45 are fitted into the 3 rd groove portions 60. In addition, the conveying mechanism causes the projection 66 of the outer claw 43 to be fitted into the 3 rd groove portion 60 in a state where the fitting portion 49 is fitted into the groove portion 16, and grips the divided core 11 discharged from the holding mechanism. This reduces the problem in the conveyance of the divided cores 11 by the conveyance mechanism. By way of example, the conveyance mechanism can reduce conveyance errors caused by fluctuations in the size of the divided cores 11.

According to embodiment 2, the 3 rd groove portion 60 having a smaller width than the groove portion 16 is provided in the 3 rd portion 20c of the divided core 11. In embodiment 2, the volume of the yoke portion 12 can be increased as compared with the case where the groove portions 16 are provided over the entire portion in the 1 st direction. The motor 1 can increase the torque that can be output, and can obtain high electrical characteristics. Further, since the 1 st groove portion 16a and the 2 nd groove portion 16b are provided in the divided core 11, the holding mechanism can accurately position the divided core 11 and stably hold the divided core 11, as in the case of embodiment 1. Thus, the stator core 5 has an effect that the stator 2 can be manufactured with high productivity and high electrical characteristics can be realized in the motor having the stator 2. Further, the stator core 5 can reduce the problem in the conveyance of the divided cores 11 by the conveyance mechanism.

Embodiment 3.

In embodiment 3, a relationship between lengths of the 1 st groove portion 16a and the 2 nd groove portion 16b in the 1 st direction will be described. Fig. 24 is a sectional view of a divided core constituting a stator according to embodiment 3 of the present invention. In fig. 24, the same cross section as shown in fig. 3 is shown. The divided core 11 shown in fig. 24 has the same structure as the divided core 11 of embodiment 2. The divided core 11 of embodiment 3 may have the same structure as the divided core 11 of embodiment 1. In embodiment 3, the same components as those in embodiments 1 and 2 are denoted by the same reference numerals, and configurations different from those in embodiments 1 and 2 will be mainly described.

In fig. 24, L1 is the length of the 1 st groove portion 16a in the 1 st direction. L2 is the length of the 2 nd groove 16b in the 1 st direction. L3 is the length of the divided core 11 in the 1 st direction, i.e., the length between the lower end 72 of the divided core 11 and the upper end 73 of the divided core 11. The L4 represents the length of the 1 st groove 16a and the 3 rd groove 60 in the 1 st direction. In embodiment 3, L1 < L2 holds. Further, L1 and L2 are set so that the difference between L2 and L1 becomes larger than the fluctuation range of the length assumed by the fluctuation of the thickness 70 of the core pieces and the fluctuation of the interval 71 between the core pieces.

Next, an effect obtained when L1 < L2 is satisfied will be described. The more core segments are stacked, the larger the fluctuation range due to the ripple becomes. Therefore, "the fluctuation range of L1 < the fluctuation range of L4 < the fluctuation range of L3" holds. Since L2 is established as L3-L4, a relationship of "the fluctuation width of L1 < the fluctuation width of L2" is assumed.

Here, La represents the length of the boss 48 provided in the jigs 46 and 47 shown in fig. 10 in the 1 st direction. When L1 is Lb, Lg is an interval necessary for inserting the boss 48 having a length La into the 1 st groove portion 16 a. In this case, Lb — La + Lg holds.

When L3 exceeds the appropriate range when the divided core 11 is manufactured, L3 can be adjusted by reducing the number of laminated core pieces. In this case, the core pieces are removed from the upper end side of the divided core 11. The reason why the core segment is removed from the upper end side will be described later. Let Le be the maximum adjustment width of L3 when L3 is Ld. In this case, L2 is Lc, and Lc is Lb + Le is La + Le + Lg. Further, the relationship La < Lb < Lc holds. The specification of the divided core 11 in which the above conditions are satisfied is sometimes referred to as specification 1 in the following description.

Fig. 25 is a diagram showing a 1 st configuration example of a divided core in embodiment 3. Fig. 26 is a view showing a state where the divided cores shown in fig. 25 are held by the holding mechanism. The 1 st structural example is an example in the case where the divided core 11 of the above-described specification 1 is manufactured and L3 is within an appropriate range. Ldmax is set to the maximum value of the appropriate range. Ldmin is set to the minimum value of the appropriate range. In this case, as shown in fig. 26, the convex portion 48 of the jig 47 is inserted into the 1 st groove portion 16a, and the convex portion 48 of the jig 46 is inserted into the 2 nd groove portion 16 b. The holding mechanism can normally hold the divided cores 11.

Fig. 27 is a view showing a 2 nd configuration example of a divided core in embodiment 3. The 2 nd structural example is an example in the case where the divided core 11 of the above-described specification 1 is manufactured and L3 of the divided core 11 exceeds an appropriate range. In the case shown in fig. 27, L3 is longer than Ldmax. In this case, the core pieces are removed from the upper end side of the manufactured divided core 11, and thereby adjustment is made so that L3 falls within an appropriate range. When L3 is shorter than Ldmin, the L3 cannot be adjusted to fall within the appropriate range, and the manufactured divided core 11 is discarded.

When L3 is adjusted, it is assumed that the core segments are removed from the lower end side of the divided core 11. When the 1 st core segment 31 constituting the lower end 72 is removed from the divided core 11 shown in fig. 27, the projection 29 provided on the 2 nd core segment from below projects from the divided core 11. Therefore, the amount of decrease in L3 is reduced according to the remaining amount of the boss 29. Further, the projection 29 projects from the lower end 72 of the divided core 11, and the holding of the divided core 11 by the holding mechanism may become unstable. On the other hand, when the 2 nd core segment 32 constituting the upper end 73 is removed from the divided core 11 shown in fig. 27, the projection 29 does not protrude from the divided core 11. The amount of reduction in L3 was equivalent to thickness 70. Further, the lower end 72 of the divided core 11 can be flattened, and thus the divided core 11 can be stably held by the holding mechanism. Therefore, when L3 is adjusted, the core segments are removed from the upper end side of the divided core 11.

Fig. 28 is a view showing a state in which the length in the 1 st direction is adjusted with respect to the divided core shown in fig. 27. The divided core 11 shown in fig. 28 is the divided core 11 according to the 2 nd configuration example, and the 2 nd core segment 32 constituting the upper end 73 is removed from the state shown in fig. 27. The upper end 73 of the divided core 11 shown in fig. 28 is constituted by the 3 rd core segment 33. As shown in fig. 28, L3 is adjusted within an appropriate range.

Fig. 29 is a view showing a state in which the adjusted divided cores shown in fig. 28 are held by the holding mechanism. As shown in FIG. 29, the convex portion 48 of the jig 47 is inserted into the 1 st groove portion 16 a. Since Lc is La + Le + Lg, even if Le is subtracted from L2 by adjustment of L3, La + Lg, which is the length of the boss 48 that can be inserted into the 2 nd groove portion 16b, is secured in L2. Therefore, the holding mechanism can insert the convex portion 48 of the jig 46 into the 2 nd groove portion 16 b. Thus, the holding mechanism can normally hold the adjusted divided cores 11.

Fig. 30 is a view showing a divided core according to comparative example 1 of embodiment 3. Comparative example 1 is a structural example in the case where L1 < L2 is not satisfied. In the divided core 11 shown in fig. 30, L1 ═ L2 ═ Lc ═ La + Le + Lg. The specification of the divided core 11 for which this condition is satisfied will be referred to as specification 2 in the following description. Comparative example 1 is an example in the case where the divided core 11 of standard 2 is manufactured and L3 is within an appropriate range in the divided core 11.

Fig. 31 is a view showing a state where the divided cores shown in fig. 30 are held by the holding mechanism. The length of the 1 st groove portion 16a and the length of the 2 nd groove portion 16b are each longer by an amount Le than the length La + Lg, which is a length into which the boss portion 48 can be inserted. Since the protrusion 48 of the jig 47 is inserted into the 1 st groove portion 16a and the protrusion 48 of the jig 46 is inserted into the 2 nd groove portion 16b, the holding mechanism can normally hold the divided cores 11. However, an unnecessary space 74 corresponding to Le is formed between the upper end of the 1 st groove portion 16a and the upper end of the boss portion 48 of the jig 47. The volume of the yoke 12 is reduced by the amount of the gap 74, and therefore the torque that can be output by the motor 1 is reduced, if compared with the case shown in fig. 26.

Fig. 32 is a view showing a divided core according to comparative example 2 of embodiment 3. Comparative example 2 is a structural example in the case where L1 < L2 is not satisfied. In the divided core 11 shown in fig. 32, L1-L2-Lb-La + Lg is true. The specification of the divided core 11 for which this condition is satisfied will be referred to as specification 3 in the following description. Comparative example 2 is an example in the case of the divided core 11 of standard 3 and L3 is within an appropriate range in the manufactured divided core 11.

Fig. 33 is a view showing a state where the divided cores shown in fig. 32 are held by the holding mechanism. The boss 48 of the jig 47 is inserted into the 1 st groove portion 16 a. Further, the boss 48 of the jig 46 is inserted into the 2 nd groove portion 16 b. The holding mechanism can normally hold the divided cores 11.

Fig. 34 is a view showing a divided core according to comparative example 3 of embodiment 3. Comparative example 3 is an example in the case where the divided core 11 of standard 3 is manufactured such that L3 exceeds an appropriate range. In the case shown in fig. 34, L3 is longer than Ldmax. In this case, L3 is adjusted so as to fall within an appropriate range by removing the core pieces from the upper end side of the manufactured divided core 11, as in the case of the 2 nd structural example shown in fig. 27.

Fig. 35 is a view showing a state in which the length in the 1 st direction is adjusted with respect to the divided core shown in fig. 34. The divided core 11 shown in fig. 35 is the divided core 11 according to comparative example 3, and the 2 nd core segment 32 constituting the upper end 73 is removed from the state shown in fig. 34. The upper end 73 of the divided core 11 shown in fig. 35 is constituted by the 3 rd core segment 33. As shown in fig. 35, L3 is adjusted so as to be within the appropriate range.

Fig. 36 is a view showing a state where the adjusted divided cores shown in fig. 35 are held by the holding mechanism. L1, Lb, the boss 48 of the jig 47 is inserted into the 1 st groove portion 16a in order to secure La + Lg, which is a length by which the boss 48 can be inserted into the 1 st groove portion 16 a. On the other hand, if L2 is satisfied, and La is subtracted from L2 by the adjustment of L3, L2 becomes shorter than La + Lg, which is the length of the protrusion 48 inserted into the 1 st groove portion 16 a. Therefore, in the holding mechanism, a gap 75 is generated between the upper end 73 of the divided core 11 and the jig 46. By the occurrence of the gap 75, the divided cores 11 are insufficiently held by the holding mechanism. As described above, with respect to the specification 3, when the adjustment of L3 is required, it becomes difficult to accurately position the divided cores 11 in the holding mechanism and stably hold the divided cores 11 by the holding mechanism.

According to embodiment 3, the stator core 5 has the 2 nd groove portion 16b in the 2 nd direction longer than the 1 st groove portion 16a in the 1 st direction, and thus the divided cores 11 can be accurately positioned in the holding mechanism and the divided cores 11 can be stably held by the holding mechanism. In addition, the motor 1 can obtain high electrical characteristics. Thus, the stator core 5 has an effect that the stator 2 can be manufactured with high productivity and high electrical characteristics can be realized in the motor having the stator 2.

The motor provided with the stator 2 according to embodiments 1 to 3 is not limited to the motor 1. The stator 2 may be provided in an electric motor other than the motor 1. In embodiment 4, a case will be described in which the stator 2 is provided in 1 of the motors other than the motor 1, that is, in the linear motor.

Embodiment 4.

Fig. 37 is a sectional view of a linear motor including an armature according to embodiment 4 of the present invention. In embodiment 4, the same components as those in embodiments 1 to 3 are denoted by the same reference numerals, and configurations different from those in embodiments 1 to 3 will be mainly described. The motor, i.e., the linear motor 80 has an armature 81 and a field element 82 opposed to each other. In embodiment 4, the armature 81 is a movable element, and the field element 82 is a stator.

The armature 81 includes an armature core 83, an insulator 6 for insulating the armature core 83, and a coil 7 for generating a magnetic field. The armature core 83 has a plurality of divided cores 11 connected to each other. The armature core 83 has the same structure as the stator core 5 of embodiment 1. The armature core 83 may have the same structure as the stator core 5 according to embodiment 2 or 3.

The field element 82 includes a plate-shaped field element core 84 and a plurality of permanent magnets 85 disposed on the field element core 84. The linear motor 80 generates a magnetic field by passing a current through the coil 7, and moves the armature 81 relative to the field element 82. The armature 81 moves in the direction in which the plurality of permanent magnets 85 are aligned. Further, the linear motor 80 may have a stator, i.e., an armature 81, and a movable member, i.e., a field element 82.

In the armature core 83, the divided core 11 includes a 1 st portion 20a constituting the 1 st slot portion 16a, a 2 nd portion 20b constituting the 2 nd slot portion 16b, and a 3 rd portion 20c provided between the 1 st portion 20a and the 2 nd portion 20 b. The 3 rd portion 20c includes a face 20c1 constituting an end of the 1 st groove portion 16a and a face 20c2 constituting an end of the 2 nd groove portion 16 b. According to embodiment 3, the armature core 83 can be manufactured with high productivity as in the case of the stator core 5 of embodiment 1, and the armature 81 can be manufactured with high productivity, and high electrical characteristics can be realized in the motor having the armature 81.

The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified without departing from the scope of the present invention.

Description of the reference numerals

1 motor, 2 stator, 3 rotor, 4 frame, 5 stator core, 6 insulator, 7 coil, 8 rotor core, 9 shaft, 10, 85 permanent magnet, 11a, 11b, 11c split core, 12 yoke, 13 tooth, 14 connection portion, 15 outer peripheral surface, 16 slot, 16a 1 st slot, 16b 2 nd slot, 17 riveting portion, 18, 19 end surface, 20a 1 st portion, 20b 2 nd portion, 20c 3 rd portion, 20c1, 20c2, 50 surface, 21 st core sheet group, 22 nd core sheet group, 23 rd core sheet group, 24, 61 th core sheet group, 25, 62 th core sheet group, 5 core sheet group, 26, 28 hole, 27, 29, 48, 66 bulge, 30, 75 gap, 31 st core sheet, 32 nd core sheet, 33 rd core sheet, 34, 64 th core sheet, 4 core sheet, 35, 65 th core sheet, 36, 37 end portion, 38, 63 notch portion, 40 nozzles, 41 wires, 42, 44 inner claws, 43, 45 outer claws, 46, 47 clamps, 49 embedded parts, 50a area, 51, 52, 53, 54 angles, 60 rd groove part, 3 rd groove part, 70 thickness, 71, 74 intervals, 72 lower ends, 73 upper ends, 80 linear motors, 81 armatures, 82 excitation elements, 83 armature cores and 84 excitation element cores.

Claims (10)

1. An armature core having a plurality of divided cores each being a laminated body of a plurality of core pieces, the plurality of divided cores being connected to each other,

the armature core is characterized in that,

each of the plurality of divided cores has a yoke portion and a tooth portion protruding from the yoke portion in a 2 nd direction perpendicular to a 1 st direction which is a direction in which the plurality of core segments are stacked,

a 1 st groove portion and a 2 nd groove portion are provided on a 2 nd surface of the yoke portion opposite to the 1 st surface on which the tooth portion is provided, the 1 st groove portion and the 2 nd groove portion each being recessed in the 2 nd direction,

the laminate comprises a 1 st portion constituting the 1 st groove part, a 2 nd portion constituting the 2 nd groove part, and a 3 rd portion provided between the 1 st portion and the 2 nd portion in the 1 st direction,

the 3 rd portion includes a surface constituting an end of the 1 st groove portion in the 1 st direction and a surface constituting an end of the 2 nd groove portion in the 1 st direction.

2. An armature core according to claim 1,

the core piece constituting the 1 st segment has a notch portion constituting the 1 st groove portion,

the core piece constituting the 2 nd portion has a notch portion constituting the 2 nd groove portion.

3. An armature core according to claim 1 or 2,

the 1 st part is one end in the 1 st direction among the laminated bodies,

the 2 nd part is the other end in the 1 st direction among the laminated bodies.

4. An armature core according to any one of claims 1 through 3,

the length of the 2 nd groove portion in the 1 st direction is longer than the length of the 1 st groove portion in the 1 st direction.

5. An armature core according to any one of claims 1 through 4,

the 3 rd part is a central part in the 1 st direction among the laminated bodies.

6. An armature core according to any one of claims 1 through 5,

a 3 rd groove portion recessed in the 2 nd direction is provided between the 1 st groove portion and the 2 nd groove portion in the 2 nd surface,

the width of the 3 rd groove part in the 3 rd direction perpendicular to the 1 st direction and the 2 nd direction is smaller than the width of the 1 rd groove part in the 3 rd direction and smaller than the width of the 2 nd groove part in the 3 rd direction.

7. An armature core according to claim 6,

the core piece constituting the 3 rd portion is formed by having a notch portion constituting the 3 rd groove portion.

8. An armature core according to any one of claims 1 through 7,

the 1 st groove portion has a shape having a portion where a width in a 3 rd direction perpendicular to the 1 st direction and the 2 nd direction is enlarged from the 2 nd surface toward the tooth portion,

the 2 nd groove portion has a shape having a portion where a width in the 3 rd direction is enlarged from the 2 nd surface toward the tooth portion.

9. An armature, characterized in that it comprises a first armature body,

an armature core having the structure as claimed in any one of claims 1 to 8.

10. An electric motor, comprising:

the armature of claim 9; and

and an exciting element.

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