CN113014005A

CN113014005A - Stator and method for manufacturing the same

Info

Publication number: CN113014005A
Application number: CN202110195121.6A
Authority: CN
Inventors: 松田刚; 三浦一洋; 浅井佑哉; 永冶孝志; 冈野巧; 曾我勤; 长坂一也
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2016-08-30
Filing date: 2017-08-24
Publication date: 2021-06-22
Also published as: JP7168039B2; US11011947B2; US20190181699A1; DE112017004346T5; JP2021166469A; US11990792B2; CN109690916A; CN109690916B; JP6915391B2; US20210218296A1; JP2018038251A

Abstract

A stator and a method of manufacturing the same. The stator (7) constitutes a rotating electrical machine, and is provided with a split core (71) in which core pieces (71A) are arranged in a ring shape in the circumferential direction, and a strip-shaped wound yoke (72) disposed on the outer peripheral wall surface of the split core. The winding yoke is arranged along the circumferential direction of the outer peripheral wall surface of the divided core, at least one convex portion (72B) is formed at one end portion of the winding yoke, and at least one concave portion (72C) which is engaged with the convex portion in the circumferential direction is formed at the inner peripheral wall surface or the outer peripheral wall surface of the divided core at the other end portion. This makes it possible to easily assemble the split core stator (7).

Description

Stator and method for manufacturing the same

The application is a divisional application of an original application with the application date of 2017, 8, 24 and the application number of 201780052383.9 and the name of 'a stator and a manufacturing method thereof'.

Cross reference to related applications

The present application is based on japanese patent application No. 2016-.

Technical Field

The present invention relates to a stator of a dc motor and a method for manufacturing the same, and more particularly, to a stator having a yoke characterized by a yoke and a method for manufacturing the same.

Background

The structure of the dc motor includes, for example, an armature and a commutator fixed to a rotating shaft, a cup-shaped yoke covering the outside of the armature, and a magnet for excitation fixed to the inner wall surface of the yoke. When the armature is disposed in the yoke, the magnet is configured to face a side surface of the armature. The opening side of the cup-shaped yoke is closed by a bracket. Further, the bracket is formed with a hole for projecting the rotary shaft, and the output-side end of the rotary shaft can be projected toward the output side. Bearings are disposed in the bottom of the yoke and in the vicinity of the hole of the bracket, and the rotating shaft is rotatably supported by these bearings. Further, a brush is disposed on the bracket, and a radially inner end of the brush is configured to be in sliding contact with the commutator. Thereby, power is supplied to the commutator from the brush connected to the external power supply. Then, the armature whose current direction is switched by the rectification of the commutator and the magnet for excitation interact with each other, and thereby the armature rotates to function as a rotor.

The yoke as described above not only covers the armature or the support magnet but also functions as a magnetic circuit. Therefore, in order to construct the magnetic circuit, it is necessary to secure a thickness of the yoke more than a predetermined thickness. However, since the conventional yoke is manufactured by pressing a material plate thickness necessary for the magnetic circuit, the thickness of the portion unnecessary for the magnetic circuit is also made to be the same as the thickness of the portion necessary for the magnetic circuit. In other words, the thickness of the unnecessary portion as the magnetic path becomes thick. Therefore, there is a problem that material cost becomes high and mass of the yoke becomes large. Therefore, a technique for solving such a problem has been proposed (for example, see patent document 1).

Patent document 1 discloses a frame structure of a dc motor. In this technique, the rotor core is surrounded by a cup-shaped frame (corresponding to a yoke), and an annular sub-frame is disposed on the outer surface of a cylindrical portion of the frame (corresponding to the yoke). With this configuration, the frame having a small thickness is manufactured as a whole, and the portion that needs to have a large thickness as the magnetic circuit is wound around the sub-frame (sub-yoke), whereby the thickness required for the magnetic circuit can be secured.

Documents of the prior art

Patent document

Patent document 1: japanese Kokai publication Hei 06-031354

Disclosure of Invention

As described above, in the technique as in patent document 1, by using the sub-frame (sub-yoke), only the thickness of the portion necessary as the magnetic circuit can be increased, and the thickness of the other portion can be decreased. Therefore, the material cost of the frame (yoke) can be reduced and the weight can be reduced. In such a conventional technique, an auxiliary frame (hereinafter referred to as an "auxiliary yoke") is fitted and fixed to a cup-shaped frame (hereinafter referred to as a "main yoke") by press-fitting or bonding.

However, according to the research of the inventors, in the method of mounting the auxiliary yoke to the main yoke by press-fitting, the main yoke is deformed by the force of the press-fitting, and the inner diameter of the main yoke is changed. Further, due to the force at the time of press-fitting, the plating layers of the main yoke and the auxiliary yoke are peeled off. In addition, in order to press-fit the auxiliary yoke, the inner and outer diameters of the main yoke must be accurately manufactured, which increases the manufacturing cost. In addition, the accuracy of the inner and outer diameters of the auxiliary yoke is also required, and the manufacturing cost is increased. In addition, in the method of attaching the auxiliary yoke to the main yoke by adhesion, the auxiliary yoke is detached due to low adhesion force. Further, the appearance is deteriorated due to the overflow of the adhesive. In addition, the mounting by welding or pressing may be performed, but the former may cause a change in the inner diameter of the main yoke and corrosion of a spot-welded portion due to thermal influence, and the latter may cause deterioration in the accuracy of the inner diameter of the main yoke due to anisotropy of the material and increase in difficulty in positioning the blank. In addition, the latter causes the retention of the processing oil between the auxiliary yoke and the main yoke. Under such circumstances, there is a demand for development of a technique that does not require excessive inner and outer diameter accuracy without changing the inner diameter of the main yoke.

In view of the above-described problems, an object of the present invention is to provide a stator and a manufacturing method thereof, which can suppress an influence of mounting on a main yoke when a sub-yoke is mounted on the main yoke.

Another object of the present invention is to provide a stator and a method of manufacturing the same, which can reduce the accuracy of the inner and outer diameters of the main yoke and the auxiliary yoke and is advantageous in terms of manufacturing cost.

The stator according to the present application is a bottomed cylindrical stator that constitutes a rotating electric machine and houses an armature fixed to a rotating shaft. The stator includes a main yoke having a bottomed cylindrical shape, a strip-shaped auxiliary yoke disposed on an outer peripheral wall surface or an inner peripheral wall surface of the main yoke, and a field magnet disposed inside the main yoke so as to face an outer side surface of the armature in a radial direction. The auxiliary yoke is disposed along the circumferential direction of the outer peripheral wall surface or the inner peripheral wall surface of the main yoke. At least one protrusion is formed at one end of the auxiliary yoke. At least one concave portion is formed at the other end portion of the auxiliary yoke, and the auxiliary yoke is engaged with the convex portion in the circumferential direction while being arranged on the outer circumferential wall surface or the inner circumferential wall surface of the main yoke in the circumferential direction.

In this way, in the present invention, the sub-yoke is disposed along the circumferential direction of the outer circumferential wall surface or the inner circumferential wall surface of the main yoke, and the convex portion and the concave portion formed at the one end portion and the other end portion of the sub-yoke in the circumferential direction are engaged with each other in a grounding manner in the circumferential direction.

Thus, the auxiliary yoke is disposed without applying a physically large force due to press-fitting or the like, and the main yoke can be effectively prevented from being affected (e.g., a change in inner diameter or peeling of plating). Further, the influence of chemical force (thermoplasticity, corrosion, change in anisotropy) at the time of welding can be effectively prevented, and there is no fear of oil retention due to pressing. Similarly, there is no fear of peeling and appearance defects which may occur during adhesion. Further, since the engaging structure is adopted, the accuracy requirement of the inner and outer diameters of the main yoke and the auxiliary yoke can be reduced, which is advantageous for reducing the manufacturing cost.

In this case, as a specific configuration, the convex portion may be engaged with the concave portion in a state of being pressed against a part of the concave portion. The engagement rigidity becomes high.

In a specific configuration, the recess may have a 1 st hole closer to an opening of the recess and a 2 nd hole farther from the opening than the 1 st hole and communicating with the 1 st hole. The axial distance of the 1 st hole portion may be smaller than the axial distance of the 2 nd hole portion. The front end of the convex portion may be provided with a widened portion that is flattened and widened to have a longer axial distance. The convex portion may be engaged with the concave portion in a state where a surface of the widened portion on the base end side of the convex portion is in close contact with a step formed between the 1 st hole portion and the 2 nd hole portion. With this configuration, the convex portion and the concave portion can be more firmly engaged with each other, and the convex portion can be effectively prevented from coming off the concave portion.

In a specific preferred embodiment, the axial distance of the opening of the recess may be smaller than the internal axial distance. The tip end portion side of the convex portion may be disposed inside the concave portion. The distal end of the convex portion may be pressed against a part of a peripheral portion defining the inside of the concave portion, and the proximal end portion side of the convex portion may be configured to have a smaller axial distance than the distal end portion side of the convex portion and be disposed in the opening of the concave portion. With this configuration, the protrusion can be effectively prevented from coming off the recess after engagement, and the engagement can be reliably and efficiently performed.

Further, when the buffer hole is formed in at least one of the vicinity of the convex portion and the vicinity of the concave portion, the buffer hole serves as a retreat hole for retreating the convex portion from the engagement force of the concave portion, and therefore, the influence of the engagement force generated in other positions can be reduced.

The stator according to the present invention is a bottomed cylindrical stator that constitutes a rotating electric machine and houses an armature fixed to a rotating shaft. The stator includes a cylindrical main yoke having a bottom, an auxiliary yoke disposed on an outer or inner peripheral wall surface of the main yoke and having a cylindrical shape formed by connecting one end portion and the other end portion of an auxiliary yoke main body of a strip plate, and a field magnet disposed inside the main yoke so as to face an outer side surface of the armature in a radial direction. The auxiliary yoke is disposed along the circumferential direction of the outer peripheral wall surface or the inner peripheral wall surface of the main yoke. One end portion and the other end portion of the auxiliary yoke body are coupled in the circumferential direction via a rotation pulling portion that is capable of rotating so as to pull one side toward the other side or separate from the other side. The auxiliary yoke is press-bonded to an inner peripheral wall surface or an outer peripheral wall surface of the yoke.

In this case, as a specific configuration, the rotation tension section may include: a tabular action part; one side connecting part connecting one point of the acting part with one end part of the auxiliary yoke main body part; and a second side connecting portion connecting the second point of the operating portion to the second end of the auxiliary yoke body. The other point may be formed at a position symmetrical to the one point with respect to the center of the action portion. With this configuration, the auxiliary yoke can be attached to the main yoke by simply rotating the rotation tension portion. Therefore, various operational effects similar to the engagement of the convex portion and the concave portion can be obtained.

In the above configuration, the convex portion and the concave portion may be provided at least in the vicinity of a position matching a position of a center of gravity of the excitation magnet in a radial direction or the rotation tension portion. In the field magnet, the position is not used as a magnetic circuit, and an engaging portion between the convex portion and the concave portion or a rotation tension portion may be disposed at the position. Accordingly, the magnetic loss is not affected.

The stator of the present invention is a method of manufacturing a stator including a main yoke having a cylindrical shape with a bottom, a strip-shaped auxiliary yoke disposed on an inner peripheral wall surface or an outer peripheral wall surface of the main yoke, and a field magnet disposed inside the main yoke so as to face an outer side surface of an armature in a radial direction, the field magnet being housed in the armature and fixed to a rotating shaft. The method for manufacturing the stator comprises a configuration step, an insertion step and a pressure welding step. In the arranging step, a band-shaped sub-yoke, in which at least one convex portion is formed at one end portion and at least one concave portion that engages with the convex portion is formed at the other end portion, is looped such that the sub-yoke is abutted along the outer circumferential wall surface or the inner circumferential wall surface of the main yoke and the convex portion and the concave portion are abutted along the circumferential direction of the outer circumferential wall surface and the inner circumferential wall surface of the main yoke. In the insertion step, the convex portion is inserted into the concave portion. In the pressure bonding step, a distal end portion of the convex portion is pressure bonded to a peripheral end portion that is a part of the concave portion, and the convex portion is deformed, whereby the convex portion is engaged with the concave portion.

In this case, the inserting step and the pressing step may be performed in a state in which the main yoke and the auxiliary yoke wound around the outer circumferential wall surface of the main yoke are accommodated in an accommodating space formed between 2 divided molds. The convex portion may be inserted into the concave portion and engaged with the concave portion by sandwiching the main yoke and the auxiliary yoke in the housing space between the 2 split molds and pressing the main yoke in a radial direction thereof. In this way, by sandwiching the main yoke and the sub-yoke between the divided 2 molds and pressing the main yoke in the radial direction, the sub-yoke can be easily wound around the outer peripheral wall surface of the main yoke, and the convex portion can be easily engaged with the concave portion.

In the above method, the convex portion may be formed with an absorption hole, and the convex portion may be engaged with the concave portion by deforming the absorption hole to deform a tip portion of the convex portion in the concave portion in the pressure bonding step.

In this way, the band-shaped auxiliary yoke is wound so that the convex portion and the concave portion are abutted in the circumferential direction and engaged with each other, thereby mounting the auxiliary yoke. Therefore, the same effects as described above can be obtained.

In the pressure bonding step, the tip of the convex portion is pressure bonded to the concave portion, and the concave portion is deformed (crushed) and engaged with the concave portion. Therefore, the engagement can be performed only by applying a force in the circumferential direction. Further, since the convex portion is deformed (crushed) inside the concave portion after the pressure bonding step, the convex portion can be effectively prevented from coming off from the concave portion. Thus, the convex portion can be easily and reliably engaged with the concave portion.

Further, since the absorption holes are formed at the distal end portions of the convex portions, when the convex portions are deformed (crushed) in the pressure bonding step, the absorption holes serve as buffers to prevent the convex portions from being broken, and the force for deforming (crushing) the convex portions can be reduced by forming the absorption holes.

The stator of the present invention is a method of manufacturing a stator including a main yoke having a cylindrical shape with a bottom, an auxiliary yoke disposed on an outer peripheral wall surface or an inner peripheral wall surface of the main yoke, and a field magnet disposed inside the main yoke so as to face an outer side surface of an armature in a radial direction, and the stator being accommodated in the armature and fixed to a rotating shaft. The method for manufacturing the stator comprises a configuration step, an insertion step and a pressure welding step. In the arranging step, the auxiliary yoke is attached to the outer peripheral wall surface or the inner peripheral wall surface of the main yoke, and the auxiliary yoke is formed in a cylindrical shape by connecting one end portion and the other end portion of the auxiliary yoke body of the strip-shaped plate and connecting the auxiliary yoke body to the rotating and tensioning portion which pulls one side to the other side or separates the one side from the other side by rotation. In the press-bonding step, the rotation tension portion is rotated to attract or separate one side of the end portion of the auxiliary yoke body portion to the other side, thereby press-bonding the auxiliary yoke to the outer circumferential wall surface or the inner circumferential wall surface of the main yoke.

With this configuration, the auxiliary yoke can be easily attached to the main yoke only by rotating the rotating and tensioning portion, and the same respective operational effects as described above can be obtained.

The stator of the application adopts the structure that the auxiliary magnetic yoke is installed on the main magnetic yoke. In this case, press fitting, welding, pressing, bonding, and the like are not required. In other words, the influence of a physically large force and the influence of a chemical property can be prevented. Therefore, changes in the inner diameter of the main yoke, plating peeling, thermoplasticity, corrosion, changes in anisotropy, oil retention, detachment of the auxiliary yoke, appearance defects, and the like can be effectively prevented. Further, since the main yoke and the sub yoke are engaged with each other or the rotating and tension part is rotated to adjust the diameter of the sub yoke, the accuracy of the inner and outer diameters of the main yoke and the sub yoke is reduced, which is also advantageous for reducing the manufacturing cost.

Drawings

Fig. 1 is a schematic configuration diagram of a motor according to embodiment 1 of the present application.

Fig. 2 is a longitudinal sectional view of the 1 st stator according to embodiment 1 of the present application.

Fig. 3 is a perspective view of the 1 st stator according to embodiment 1 of the present application.

Fig. 4 is a sectional view taken along line a-a of fig. 1 and a plan view thereof.

Fig. 5 is an explanatory view showing a mounting portion of the 1 st auxiliary yoke according to embodiment 1 of the present application.

Fig. 6 is an explanatory diagram showing a dimensional configuration of a mounting portion of the 1 st auxiliary yoke according to embodiment 1 of the present application.

Fig. 7 is a view showing a modification of the mounting portion of the 1 st auxiliary yoke according to embodiment 1 of the present application.

Fig. 8 is an explanatory view showing a manufacturing process of the 1 st stator according to embodiment 1 of the present application.

Fig. 9 is a view showing a modification of the 1 st stator manufacturing process according to embodiment 1 of the present application.

Fig. 10 is a perspective view showing the 2 nd stator according to embodiment 2 of the present application.

Fig. 11 is an explanatory view showing a rotation tension portion of the 2 nd auxiliary yoke according to embodiment 2 of the present application.

Fig. 12 is an explanatory diagram illustrating a function of the rotary tension member according to embodiment 2 of the present application.

Fig. 13 is a schematic plan view of a split core stator.

Fig. 14 is a perspective view of the winding yoke.

Fig. 15 is an explanatory diagram illustrating a manufacturing process of the split core stator.

Fig. 16 is a view showing a 1 st modification of the winding yoke.

Fig. 17 is a view showing a 2 nd modification of the winding yoke.

Detailed Description

Hereinafter, a plurality of embodiments for carrying out the present application will be described with reference to the drawings. In each of the embodiments, the same reference numerals are assigned to portions corresponding to the matters described in the previous embodiment, and redundant description may be omitted. In each aspect, when only a part of the configuration is described, the one described above can be applied to the other part of the configuration. Not only combinations of parts that can be combined are specifically and explicitly shown in each embodiment, but also embodiments can be partially combined without being explicitly shown as long as the combinations are not hindered. Hereinafter, embodiments of the present application will be described based on the drawings. The configuration described below is not limited to the present application, and various modifications can be made within the scope of the present application.

In this embodiment, a stator and a manufacturing method thereof will be described, in which the auxiliary yoke can be easily attached while reducing the physical influence on the main yoke when the auxiliary yoke is attached.

Fig. 1 to 12 illustrate the present application, and fig. 1 is a schematic configuration diagram of a motor common to embodiment 1 and embodiment 2. Fig. 2 to 7 show embodiment 1, fig. 2 corresponds to a longitudinal sectional view of the 1 st stator, fig. 3 is a perspective view of the 1 st stator, fig. 4 is a sectional view taken along line a-a and a plan view of fig. 1, fig. 5 is an explanatory view showing a mounting portion of the 1 st auxiliary yoke, fig. 6 is an explanatory view showing a dimensional configuration of the mounting portion of the 1 st auxiliary yoke, fig. 7 is a view showing a modification of the mounting portion of the 1 st auxiliary yoke, fig. 8 is an explanatory view showing a manufacturing process of the 1 st stator, and fig. 9 is a view showing a modification of the manufacturing process of the 1 st stator. In fig. 2, only the stator and the magnet are shown for explaining the 1 st stator, and the other drawings are omitted. Fig. 10 to 12 show embodiment 2, fig. 10 is a perspective view showing the 2 nd stator, and fig. 11 is an explanatory view showing a rotation tension portion of the 2 nd auxiliary yoke. Fig. 12 is an explanatory diagram for explaining the function of the rotation tension section in detail.

< embodiment 1 > < schematic structure of motor

The illustrated motor M is a dc motor. The structure of the motor M will be briefly described below. The motor M of the present embodiment is configured by combining the rotor 1, the 1 st stator 2, the end plate 3, and the brush 4. The output side of the motor M refers to a side to which the power of the motor M is transmitted, and in fig. 1, refers to a side facing the left side of the figure. The base end portion side is a side opposite to the output side in the axial direction of the rotary shaft 11.

As shown in fig. 1, the rotor 1 includes a rotary shaft 11 serving as a rotation center, an armature 12, and a commutator 13. The armature 12 is rotatably assembled integrally with the rotary shaft 11, and includes a rotor core 12A and a coil 12B wound around the rotor core 12A. The cylindrical commutator 13 is fixed to the rotating shaft 11, but its fixed position is closer to the output side than the armature 12 and can rotate integrally with the rotating shaft 11. The coil 12B constituting the armature 12 is electrically connected to the commutator 13 (to be precise, a commutator segment attached to the outer periphery).

The 1 st stator 2 includes a cup-shaped main yoke 21, a 1 st annular auxiliary yoke 22 disposed outside the main yoke 21, and a magnetic field-generating magnet 23. A cup-shaped bearing arrangement portion 21A protruding in the direction of the base end portion is formed at the center of the cup-shaped bottom portion of the main yoke 21. The portion other than the bearing arrangement portion 21A is referred to as "main yoke body 21B". An annular ball bearing K1 is disposed inside the bearing arrangement portion 21A, and the base end side end portion of the rotary shaft 11 is rotatably supported by the ball bearing K1. The field magnet 23 is a tile-shaped permanent magnet, and a plurality of magnets (the number corresponding to the number of poles) are attached to the inner wall of the main yoke body 21B. In this example, 4 poles are illustrated, and four magnets 23 are used.

The main yoke 21 is a cup-shaped (bottomed cylindrical) magnetic body, and particularly, the main yoke main body 21B functions to form a magnetic circuit by coupling the

magnets

23, 23 attached to the inner wall by magnetic flux. The 1 st auxiliary yoke 22 is an annular magnetic body, is disposed so as to be wound around the outer surface (corresponding to the outer peripheral wall surface) of the main yoke body 21B, and reinforces the function as a magnetic circuit of the main yoke 21. The structure for attaching the 1 st auxiliary yoke 22 to the main yoke 21 is the main structure of the present application, and will be described in detail later.

Further, the opening side of the main yoke 21 is closed by an end plate 3 (brush holder). A through hole (not shown) for penetrating the output side of the rotary shaft 11 is formed in the center of the end plate 3, and an annular ball bearing K2 is disposed on the inner wall surface of the through hole. The output side of the rotary shaft 11 is rotatably supported by the ball bearing K2. A brush 4 is disposed on a surface of the end plate 3 on the proximal end side. The brush 4 is a prismatic member, and is configured such that an end portion on the radial center side abuts against an outer surface of the commutator 13 (more precisely, a commutator segment attached to the outer periphery).

As described above, the armature 12 constituting the rotor 1 is housed inside the cup-shaped 1 st stator 2, and the opening (opening on the output side) of the 1 st stator 2 is closed by the end plate 3 in a state where the output side end of the rotating shaft 11 is projected. In this state, the base end and output end of the rotating shaft 11 are rotatably supported by the ball bearings K1 and K2, and the brush 4 disposed on the output side surface of the end plate 3 is in contact with the outer surface of the commutator 13. A magnet 23 for excitation is attached to an inner surface of the main yoke main body 21B constituting the 1 st stator 2, and the magnet 23 is configured to face an outer surface of the armature 12.

Although not shown, the brush 4 is supplied with power from an external power supply, and the current supplied from the brush 4 is rectified by the commutator 13 and supplied to the armature 12. The rotor 1 is rotated by the interaction between the armature 12, which is an electromagnet whose magnetic force direction is switched, and the fixed field magnet 23. The 1 st stator 2 is configured such that the main yoke 21 and the 1 st sub-yoke 22 are combined into one yoke, and in this example, the 1 st sub-yoke 22 having an annular shape is disposed on the outer surface of the main yoke 21. In addition, although the configuration in which the 1 st auxiliary yoke 22 is disposed on the outer side surface of the main yoke 21 has been described in the present embodiment, it is needless to say that the present invention is not limited to this, and a configuration may be adopted in which an annular 1 st auxiliary yoke 22 is disposed on the inner side surface (corresponding to the inner peripheral wall surface) of the main yoke 21, and the magnet 23 is disposed on the inner side surface of the 1 st auxiliary yoke 22. However, in view of workability in manufacturing and the like, the configuration in which the 1 st auxiliary yoke 22 is disposed on the outer side surface of the main yoke 21 is more preferable.

< constitution of No. 1 auxiliary yoke >

The structure of the 1 st auxiliary yoke 22 of the present embodiment will be described with reference to fig. 3 to 7. The 1 st auxiliary yoke 22 of the present embodiment is a cylindrical member formed by annularly surrounding a rectangular strip-shaped plate-like body. As shown in fig. 3, the 1 st auxiliary yoke 22 of the present embodiment includes a 1 st auxiliary yoke body 22A, a 1 st auxiliary yoke projection 22B, and a 1 st auxiliary yoke recess 22C. The 1 st auxiliary yoke main body portion 22A is a rectangular (strip-shaped) plate body, and is a portion that is formed into a cylindrical shape by surrounding a ring shape. For the sake of description, the longer side of the rectangular 1 st auxiliary yoke body 22A will be referred to as "longer side 221", and the shorter side will be referred to as "shorter side 222". The long side 221 is configured to have substantially the same length as the girth length of the outer surface of the main yoke body 21B.

Further, the 1 st auxiliary yoke projection 22B is formed on one short side 222 of the 1 st auxiliary yoke body portion 22A (i.e., one end portion of the 1 st auxiliary yoke 22). The 1 st auxiliary yoke recess 22C is formed in the other short side 222 of the 1 st auxiliary yoke body portion 22A (i.e., the other end of the 1 st auxiliary yoke 22). The 1 st auxiliary yoke projection 22B is a projection projecting from one short side 222 in the direction in which the long side 221 extends. In the present embodiment, the tip end portion of the 1 st auxiliary yoke projection 22B is initially formed in an arc shape. As shown in fig. 5, the 1 st auxiliary yoke projection 22B has an absorption hole H1 (strictly speaking, it is hollow). As described later, the absorption hole H1 is a portion that becomes a relief hole when the 1 st auxiliary yoke convex portion 22B is deformed in the 1 st auxiliary yoke concave portion 22C. In the present embodiment, as shown in fig. 3, three 1 st auxiliary yoke projection portions 22B are formed so as to be aligned in the axial direction.

The 1 st auxiliary yoke recess 22C is a recess formed from the other short side 222 in the direction in which the long side 221 extends. In the present embodiment, as shown in fig. 5, the 1 st auxiliary yoke recess 22C is configured to include an insertion portion 223 and a deformation portion 224. The insertion portion 223 corresponds to the 1 st hole portion closer to the opening of the 1 st auxiliary yoke recess 22C, and is a rectangular hole portion cut from the other short side 222. The deformation portion 224 corresponds to the 2 nd hole, is an opening that is farther from the 1 st auxiliary yoke recess 22C than the insertion portion 223, and is a rectangular hole that communicates with the insertion portion 223. The axial distance (opening width) of the insertion portion 223 is substantially equal to the axial distance (axial length) of the base end portion of the 1 st auxiliary yoke projection 22B, and is smaller than the axial distance of the deformation portion 224. In other words, the 1 st auxiliary yoke recess 22C is a slit-shaped hole formed in the direction in which the long side 221 extends (from one short side 222 toward the other short side 222) so that the entrance side (the end of one short side 222) is a narrow hole (insertion portion 223) and the inside is a wide hole (deformation portion 224). To describe in more detail, as shown in fig. 5, an L-shaped step 225 is formed between the insertion portion 223 and the deformation portion 224. In the present embodiment, as shown in fig. 3, three 1 st auxiliary yoke concave portions 22C are formed so as to be arranged in the axial direction, and when the 1 st auxiliary yoke body portion 22A is annularly surrounded and the two

short sides

222, 222 are aligned, the three 1 st auxiliary yoke convex portions 22B are positioned so as to match the positions of the three 1 st auxiliary yoke concave portions 22C.

In the present embodiment, as shown in fig. 3, a buffer hole H2 is formed near the base end portion side of the 1 st auxiliary yoke convex portion 22B and near the deformation portion 224 of the 1 st auxiliary yoke concave portion 22C. These buffer holes H2 serve as buffer portions for preventing the force applied by the engagement operation and the deformation caused by the force from affecting other portions (portions other than the end portions subjected to the engagement operation) of the 1 st auxiliary yoke body 22A when the 1 st auxiliary yoke convex portion 22B is engaged with the 1 st auxiliary yoke concave portion 22C. That is, when the 1 st auxiliary yoke body 22A is looped and the two

short sides

222, 222 are aligned, the tip end of the 1 st auxiliary yoke projection 22B fits into the 1 st auxiliary yoke recess 22C and deforms the absorbing hole H1, and the two

short sides

222, 222 are in a state of close contact, and from this state, when the tip end of the 1 st auxiliary yoke projection 22B is further pushed inward of the 1 st auxiliary yoke recess 22C, the buffer hole H2 functions as a deformation hole.

In the present embodiment, as shown in fig. 4, the joint portion of the 1 st auxiliary yoke 22, i.e., the portion where one short side 222 and the other short side 222 abut each other, is disposed outside the position where the magnet 23 is disposed. Preferably, as shown in fig. 4 (b), the abutting portion is preferably located within a range where the magnet 23 is arranged in the circumferential direction. More preferably, the engagement position of the 1 st auxiliary yoke convex portion 22B and the 1 st auxiliary yoke concave portion 22C is a position radially matching the position of the center of gravity of the magnet 23. In the present embodiment, since the three 1 st auxiliary yoke convex portions 22B engage with the three 1 st auxiliary yoke concave portions 22C, the position where the 1 st auxiliary yoke convex portion 22B located at the center in the axial direction engages with the 1 st auxiliary yoke concave portion 22C is arranged at a position matching the position of the center of gravity of the magnet 23 in the radial direction. In addition, when there is one position at which the 1 st auxiliary yoke convex portion 22B engages with the 1 st auxiliary yoke concave portion 22C, the one engagement position is preferably arranged at a position matching the position of the center of gravity of the magnet 23 in the radial direction. This is a position of the magnet 23 that is not used as a magnetic circuit and is not affected by magnetic loss, and therefore this position is one of the engagement positions of the 1 st auxiliary yoke convex portion 22B and the 1 st auxiliary yoke concave portion 22C.

Next, the engagement between the 1 st auxiliary yoke convex portion 22B and the 1 st auxiliary yoke concave portion 22C will be described with reference to fig. 5 to 7. As shown in fig. 5 (a), the 1 st auxiliary yoke convex portion 22B is inserted into the 1 st auxiliary yoke concave portion 22C. As shown in fig. 6, the length t2 (the distance in the direction in which the long side 221 extends) of the 1 st auxiliary yoke convex portion 22B is slightly greater than the length t1 of the 1 st auxiliary yoke concave portion 22C in the above-described direction. Therefore, in a state where the tip end portion of the 1 st auxiliary yoke convex portion 22B is in contact with the bottom side portion of the 1 st auxiliary yoke concave portion 22C, as shown in fig. 5 (B), a slight gap K is formed between one short side 222 and the other short side 222. The width Δ t of the gap K is Δ t 2- Δ t 1. As shown in fig. 6, the axial distance t3 of the insertion portion 223 is substantially equal to the axial distance t4 of the 1 st auxiliary yoke projection 22B (length t3 ≈ length t 4). With the above-described configuration, in the state shown in fig. 5 (B), the base end portion side of the 1 st auxiliary yoke convex portion 22B is held by the insertion portion 223, and in the present embodiment, in order to more firmly engage the 1 st auxiliary yoke convex portion 22B with the 1 st auxiliary yoke concave portion 22C, a force is further applied in the arrow direction from the state shown in fig. 5 (B). Of course, from the viewpoint of facilitating insertion of the 1 st auxiliary yoke convex portion 22B into the insertion portion 223, the axial distance t3 of the insertion portion 223 may be slightly greater than the axial distance t4 of the 1 st auxiliary yoke convex portion 22B.

When a force is applied in the direction of the arrow from the state of fig. 5 (b), the width of the gap K becomes almost 0, and one short side 222 comes into contact with (including pressure contact with) or approaches the other short side 222. At the same time, the tip end portion of the 1 st auxiliary yoke projection 22B is pressed against the 1 st auxiliary yoke recess 22C, and as shown in fig. 5 (C), the tip end portion of the 1 st auxiliary yoke projection 22B is deformed inside the deformation portion 224 of the 1 st auxiliary yoke recess 22C. At this time, since the axial distance t5 of the deformation portion 224 is greater than the axial distance t4 of the 1 st auxiliary yoke projection 22B, the difference becomes a deformation amount, and the tip of the 1 st auxiliary yoke projection 22B is deformed in the 1 st auxiliary yoke recess 22C. In other words, the 1 st auxiliary yoke projection 22B is squashed at its front end. At this time, the absorption hole H1 formed at the front end portion of the 1 st auxiliary yoke projection 22B is deformed, and the 1 st auxiliary yoke projection 22B can be effectively prevented from being damaged by the applied force.

As described above, in the present embodiment, the tip end portion of the 1 st auxiliary yoke projection 22B is crushed so as to be widened in the axial direction in the deformation portion 224, and thereby the axial distance of the tip end portion of the 1 st auxiliary yoke projection 22B becomes larger than the axial distance t3 of the insertion portion 223. In other words, the 1 st auxiliary yoke projection 22B has a widened portion 226 that is flattened at the tip end portion to widen the axial distance. As shown in fig. 5 (C), both axial ends of the widened portion 226 are pressed against edge surfaces located at both axial ends of the deformation portion 224, and the 1 st auxiliary yoke convex portion 22B is engaged with the 1 st auxiliary yoke concave portion 22C. This enables the 1 st auxiliary yoke convex portion 22B to be reliably engaged with the 1 st auxiliary yoke concave portion 22C with high strength. As described above, by press-fitting the front end of the 1 st auxiliary yoke projection 22B into the deformation portion 224, the 1 st auxiliary yoke projection 22B can be effectively prevented from coming out of the insertion portion 223.

As described above, according to embodiment 1 of the present application, the 1 st auxiliary yoke convex portion 22B and the 1 st auxiliary yoke concave portion 22C are engaged so as to face each other in a state where the 1 st auxiliary yoke 22 is arranged on the outer side surface of the main yoke 21 in the circumferential direction of the outer side surface. As a result, the 1 st auxiliary yoke 22 is wound around the outer surface of the main yoke 21 without affecting the main yoke 21 (specifically, without causing the inner diameter deformation). In addition, the accuracy requirements of the inner and outer diameters of the main yoke 21 and the 1 st auxiliary yoke 22 can be reduced, and the problems such as plating separation and the accumulation of processing oil on the outer surface of the main yoke 21 can be suppressed. In addition, the above-described engagement structure is also the same in the configuration in which the 1 st sub-yoke 22 is disposed along the inner surface of the main yoke 21, and in this configuration, the 1 st sub-yoke convex portion 22B is engaged with the 1 st sub-yoke concave portion 22C on the radial center side of the inner surface of the main yoke 21.

As shown in fig. 5 (c), when both axial ends of the widened portion 226 provided at the tip end portion of the 1 st auxiliary yoke convex portion 22B are pressed against edge surfaces located at both axial ends of the deformation portion 224, the engaged state is maintained only by the frictional force generated therebetween. On the other hand, as shown in fig. 7, when the 1 st auxiliary yoke convex portion 22B is engaged with the 1 st auxiliary yoke concave portion 22C so that the surface of the widened portion 226 on the base end portion side of the 1 st auxiliary yoke convex portion 22B is in close contact with (closely attached to) the step 225 in the 1 st auxiliary yoke concave portion 22C, the engaged state is more firmly maintained.

< method for manufacturing stator 1 >

Next, a method of manufacturing the 1 st stator 2 according to the present embodiment will be described with reference to fig. 8. As described above and shown in fig. 8 (a), the 1 st auxiliary yoke 22 is initially formed of a rectangular strip-shaped plate, and three 1 st auxiliary yoke protrusions 22B are formed on one short side and three 1 st auxiliary yoke recesses 22C are formed on the other short side. In the arrangement step shown in fig. 8 (B), the 1 st auxiliary yoke body 22A of the 1 st strip-shaped auxiliary yoke 22 is wound around the outer side surface of the main yoke body 21B. At this time, the 1 st auxiliary yoke convex portion 22B and the 1 st auxiliary yoke concave portion 22C are wound so as to abut against each other in the circumferential direction. Next, as shown by the arrow in fig. 8 (B), in the insertion step, the 1 st auxiliary yoke convex portion 22B is inserted into the 1 st auxiliary yoke concave portion 22C (see also fig. 5 (a)). Next, in the pressure bonding step shown in fig. 8 (C), a force F is further applied in the circumferential direction, and the tip end of the 1 st auxiliary yoke projection 22B is pressed against the inner edge of the deformation portion 224 of the 1 st auxiliary yoke recess 22C, thereby deforming the tip end of the 1 st auxiliary yoke projection 22B. Then, finally, the front end portion of the 1 st auxiliary yoke convex portion 22B is deformed (in other words, the widened portion 226 is formed) inside the deformed portion 224 of the 1 st auxiliary yoke concave portion 22C, and is pressed against the edge surfaces of both ends in the axial direction of the deformed portion 224. Thereby, the 1 st auxiliary yoke convex portion 22B is reliably engaged with the 1 st auxiliary yoke concave portion 22C with high strength (see also fig. 5 (B) → fig. 5 (C)). Thus, the 1 st auxiliary yoke 22 is assembled to the main yoke 21. At this time, the surface of the widened portion 226 on the base end portion side of the 1 st auxiliary yoke convex portion 22B is in close contact (close contact) with the step 225 between the insertion portion 223 and the deformation portion 224, whereby the engaged state between the 1 st auxiliary yoke convex portion 22B and the 1 st auxiliary yoke concave portion 22C can be further firmly maintained.

In addition, the step of disposing the magnet 23 is also performed when the 1 st stator 2 is formed, but this step may be performed at any stage. Preferably, the 1 st auxiliary yoke 22 may be disposed at a stage before the main yoke body 21B is wound around the 1 st auxiliary yoke 22 so that the engagement position between the 1 st auxiliary yoke convex portion 22B and the 1 st auxiliary yoke concave portion 22C can be easily grasped. In the present embodiment, the 1 st auxiliary yoke 22 is wound around the outer side surface of the main yoke body 21B, and therefore the magnet 23 is disposed on the inner side surface of the main yoke body 21B, but this disposition may be performed by any method such as adhesion with an adhesive or welding.

< modification of the method for manufacturing the 1 st stator >

Next, a modification of the method for manufacturing the 1 st stator 2 according to the present embodiment will be described with reference to fig. 9. The steps illustrated in fig. 9 (c) to (e) are performed using 2 divided molds S1 and S2, which will be described later, but for convenience of explanation, the divided molds S1 and S2 are not illustrated in fig. 9 (c) to (e). In fig. 9, (c) to (e) are also enlarged views of the mounting portion of the 1 st auxiliary yoke 22. In the method of manufacturing the 1 st stator 2 according to the modification, as shown in fig. 9 (a), the main yoke 21 and the 1 st sub-yoke 22 are sandwiched between the molding dies (the split dies S1 and S2) divided into two upper and lower parts, and both yokes are pressed in the radial direction, whereby the 1 st sub-yoke 22 is arranged on the outer surface of the main yoke 21. To describe in more detail, in the arranging step, the 1 st auxiliary yoke body 22A of the 1 st strip-shaped auxiliary yoke 22 is wound around the outer side surface of the main yoke body 21B. Thereafter, as shown in fig. 9 (b), the main yoke 21 around which the 1 st auxiliary yoke 22 is wound is accommodated in the substantially cylindrical accommodation space formed between the 2 split molds S1 and S2. Then, while the main yoke 21 and the 1 st auxiliary yoke 22 are kept housed in the housing space, the insertion step and the pressure bonding step are performed by sandwiching both yokes by 2 split molds S1 and S2 and pressing them in the radial direction. As a result, as shown in fig. 9 (C), the tip end portion of the 1 st auxiliary yoke convex portion 22B is inserted into the 1 st auxiliary yoke concave portion 22C through the insertion portion 223, and is deformed by being pressed against the deformation portion 224, thereby forming the widened portion 226. Thereafter, when the main yoke 21 and the 1 st sub-yoke 22 are further pressed in the radial direction, both yokes are reduced in diameter and the tip end portion of the 1 st sub-yoke projection 22B is further crushed, and the widened portion 226 is expanded to a length corresponding to the axial distance of the deformation portion 224, as shown in fig. 9 (d). After the above steps, the main yoke 21 is restored to the original diameter, and the 1 st auxiliary yoke 22 is kept in a diameter-reduced state against the pressing force from the main yoke 21. Therefore, the 1 st auxiliary yoke convex portion 22B acts to try to come off from the 1 st auxiliary yoke concave portion 22C. At this time, as shown in fig. 9 (e), the widened portion 226 is locked by the step 225 between the insertion portion 223 and the deformation portion 224. Thereby, the engagement state of the 1 st auxiliary yoke convex portion 22B and the 1 st auxiliary yoke concave portion 22C is firmly held.

< 2 nd embodiment >

Next, embodiment 2 will be described with reference to fig. 10 to 12. In the 2 nd stator 102 of this example, the shape of the 1 st auxiliary yoke 22 is changed to the 2 nd auxiliary yoke 6 as compared with the above 1 st embodiment, and the other steps are the same. As shown in fig. 10, the 2 nd auxiliary yoke 6 includes a 2 nd auxiliary yoke body 6A and a rotation tension part 6B. The 2 nd auxiliary yoke main body portion 6A is a rectangular (strip-shaped) plate body, and is a portion that is formed into a cylindrical shape by surrounding a ring shape. For the sake of description, the longer side of the rectangular 2 nd auxiliary yoke body 6A will be referred to as "longer side 106", and the shorter side will be referred to as "shorter side 206". The long side 106 is slightly shorter than the girth of the outer surface of the main yoke body 21B.

As shown in fig. 10, the rotation tension portion 6B includes an acting portion 61, one coupling portion 62, and the other coupling portion 63. The action portion 61 is formed in a rectangular flat plate shape, and the one connection portion 62 extends from a point P1, which is one point of the outer periphery of the action portion 61, to one short side 206, and the other connection portion 63 extends from a point P2, which is one point of the outer periphery of the action portion 61, to the other short side 206. The point P1 and the point P2 are formed at positions point-symmetrical with respect to the center of the action portion 61. With the above configuration, when a rotational force in the black arrow direction is applied to the acting portion 61, the circumferential distance between the

short sides

206 and 206 of the 2 nd auxiliary yoke body 6A is shortened.

In other words, as shown in fig. 11, when a rotational force in the black arrow direction is applied to the acting portion 61, the circumferential distance between the

short sides

206 and 206 of the 2 nd auxiliary yoke body 6A is shortened from t6 to t 7. Therefore, the 2 nd auxiliary yoke 6 can be attached to the outer periphery of the main yoke body 21B by inserting the 2 nd auxiliary yoke 6 in the initial state into the main yoke body 21B and applying a rotational force in the black arrow direction to the acting portion 61 by forming the inner periphery of the 2 nd auxiliary yoke 6 to be larger than the outer periphery of the main yoke body 21B (t 6-t 7). In addition, the function of the rotation tensioning portion 6B is schematically shown in fig. 12. In the path of (a) → (b) → (c) of fig. 12, as described above, the circumferential distance between the

short sides

206, 206 of the 2 nd auxiliary yoke body 6A is shortened from t6 to t7, but the circumferential distance between the

short sides

206, 206 of the 2 nd auxiliary yoke body 6A can be widened from t6 to t8 by applying a rotational force in the opposite direction to the action portion 61. In this way, in this example, the 2 nd auxiliary yoke 6 can be attached and detached and fine adjustment can be performed.

When the 2 nd auxiliary yoke 6 is attached to the inner peripheral surface of the main yoke body 21B, the circumferential distance between the

short sides

206 and 206 of the 2 nd auxiliary yoke body 6A may be increased from t6 to t 8. This is the path of (a) → (d) → (e) of fig. 12. In other words, the inner periphery of the 2 nd auxiliary yoke 6 is formed smaller than the inner periphery of the main yoke body 21B in the initial state (t 8-t 6), and the 2 nd auxiliary yoke 6 can be attached to the inner periphery of the main yoke body 21B by inserting the 2 nd auxiliary yoke 6 in the initial state into the main yoke body 21B and applying a rotational force in the black arrow direction of fig. 12 (d) to the acting portion 61.

The rotation tension portion 6B is preferably arranged outside the position where the magnet 23 is arranged, for the same reason as in the above-described embodiment 1. The method for manufacturing the 2 nd stator 102 is as follows. First, a placement step of inserting the main yoke body 21B (or inserting the 2 nd auxiliary yoke 6 into the main yoke body 21B) into the 2 nd auxiliary yoke 6 in the initial state (the

short sides

206, 206 are connected by the turnbuckle 6B to form a cylindrical shape) is performed. Next, a pressure bonding step is performed in which the working portion 61 is rotated to shorten (or separate) the circumferential distance between the

short sides

206, 206 of the 2 nd auxiliary yoke body 6A, thereby pressure bonding the 2 nd auxiliary yoke 6 to the outer circumferential wall surface (or the inner circumferential wall surface) of the main yoke body 21B. In forming the 2 nd stator 102, the steps of disposing the magnets 23 and the like are the same as those in embodiment 1, and therefore, the description thereof is omitted.

Method for manufacturing split core stator

Next, as an application example of the above-described stator manufacturing method, a method of manufacturing the split core stator 7 will be described with reference to fig. 13 to 17. Fig. 13 is a schematic plan view of the split core stator 7, fig. 14 is a perspective view of the winding yoke 72, fig. 15 is an explanatory view showing a manufacturing process of the split core stator 7, and fig. 16 and 17 are views showing a modification of the winding yoke 72. Although fig. 14 shows the winding yoke 72 wound around the outer side surface of the split core 71, the split core 71 is not shown in the drawing for convenience of illustration.

As shown in fig. 13, the split core stator 7 includes an annular split core 71 and a wound yoke 72. The split core 71 is configured by arranging core pieces 71A in a substantially T shape in a ring shape in the circumferential direction. The winding yoke 72 is an annular metal plate disposed around the outer side surface of the split core 71. As a comparative example, the split core stator 7 can be configured as follows: after the split cores 71 are temporarily assembled by arranging the core pieces 71A in a ring shape in the circumferential direction, the temporarily assembled split cores 71 are press-fitted with the winding yoke 72 formed in a cylindrical shape in advance. However, in such a step, when the temporarily assembled split core 71 is press-fitted into the winding yoke 72, the split core 71 may be disassembled (strictly speaking, the connection state of the core piece 71A is released). On the other hand, if the same structure as that of the 1 st and 2 nd auxiliary yokes 22 and 6 is adopted for the winding yoke 72, the winding yoke 72 can be smoothly assembled on the outer side surface of the temporarily assembled split core 71, and the split core stator 7 can be easily assembled.

Specifically, when the winding yoke 72 having the same structure as the 1 st auxiliary yoke 22 is used, the winding yoke 72 has a band-shaped winding yoke body 72A, and has a convex portion 72B at one end portion and a concave portion 72C at the other end portion, as shown in fig. 14. The winding yoke body 72A has the same structure as the above-described 1 st auxiliary yoke body 22A, and the long side thereof is configured to have substantially the same length as the circumferential length (length in the circumferential direction) of the outer side surface of the split core 71. The convex portion 72B has the same structure as the 1 st auxiliary yoke convex portion 22B, and the concave portion 72C has the same structure as the 1 st auxiliary yoke concave portion 22C.

The winding yoke 72 having the above-described configuration can be arranged on the outer surface of the split core 71 in substantially the same manner as the step of arranging the 1 st auxiliary yoke 22 on the outer surface of the main yoke 21 in embodiment 1. To describe in more detail, first, as shown in fig. 15 (a), the core pieces 71A are arranged in a ring shape in the circumferential direction, and the split cores 71 are temporarily assembled. In this case, the core segment 71A can be easily arranged in an annular shape by arranging a columnar jig T at the center of the core (a position in contact with the inner surface of the core segment 71A) and arranging the core segment 71A around the outer peripheral surface of the jig T. Thereafter, as shown in fig. 15 (b), the winding yoke body portion 72A of the winding yoke 72 is wound around the outer side surface of the temporarily assembled split core 71. At this time, by continuously arranging the jig T at the core center, the winding yoke 72 can be wound while maintaining the roundness of the split core 71.

After the winding yoke 72 is wound around the outer surface of the split core 71, the convex portion 72B and the concave portion 72C abut against each other in the circumferential direction. After this state, an insertion step is performed in which the winding yoke 72 is pulled toward the radial center side to insert the convex portion 72B into the concave portion 72C. Thereby, in the same step as that shown in fig. 5 (a), the tip end portion of the convex portion 72B enters the deformed portion 224 through the insertion portion 223 of the concave portion 72C. Thereafter, a pressure bonding step is performed to press the tip of the projection 72B against the inner edge of the deformed portion 224 of the recess 72C and crush the tip of the projection 72B in the same step as the step shown in fig. 5 (B). Thus, as in the case shown in fig. 5 (C), the tip end portion of the convex portion 72B is deformed in the deformed portion 224 of the concave portion 72C to form the widened portion 226, and is pressed against the edge surfaces at both ends in the axial direction of the deformed portion 224. Thus, the convex portion 72B is reliably engaged with the concave portion 72C with high strength. Thus, the winding yoke 72 is assembled to the split core 71. In the compression step, since the winding yoke body 72A is pulled toward the radial center side, the core piece 71A located inside the winding yoke body 72A is pressed toward the radial center side. As a result, the core pieces 71A are pressed against the outer peripheral surface of the columnar jig T, and as a result, the roundness of the split core 71 can be further improved.

The shapes of the projection 72B and the recess 72C are not limited to the same shapes as the 1 st auxiliary yoke projection 22B and the 1 st auxiliary yoke recess 22C in embodiment 1, and other shapes may be considered. For example, as shown in fig. 16, the convex portion 72B and the concave portion 72C may be configured to be engageable by snap-fitting. In other words, as shown in fig. 16 (a), both axial end portions of the distal end portion of the convex portion 72B may protrude in a claw shape, and the insertion portion 223 of the concave portion 72C may have a tapered shape corresponding to the distal end shape of the convex portion 72B. In such a configuration, when the winding yoke 72 is pulled toward the radial center side and the convex portion 72B is inserted into the concave portion 72C, as shown in fig. 16 (B), the tip end portion of the convex portion 72B widens the insertion portion 223 of the concave portion 72C and enters the deformed portion 224 of the concave portion 72C, and then the widened insertion portion 223 returns to the original size. Thereby, the convex portion 72B and the concave portion 72C are engaged in a snap-fit manner.

The method of assembling the winding yoke 72 to the split core 71 is not limited to the method of winding the band-shaped winding yoke body 72A around the outer surface of the split core 71, and the method shown in fig. 17 may be used. In the method shown in fig. 17, after the split core 71 is inserted (strictly, slowly inserted) into the winding yoke body portion 72A that is previously formed into a cylindrical shape, the inner diameter of the winding yoke body portion 72A is reduced to the diameter of the outer surface of the split core 71, and the winding yoke 72 is assembled to the split core 71.

To describe in more detail, in the method shown in fig. 17, as shown in fig. 17 (a), the winding yoke 72 has a discontinuous portion 72G at a position halfway in the circumferential direction of the cylindrical winding yoke body portion 72A, and the discontinuous portion includes a 1 st extending protrusion 72D, a 2 nd extending protrusion 72E, and a central connecting portion 72F. The 1 st extending protrusion 72D is a rectangular portion extending and protruding from one end of the intermittent portion 72G in the circumferential direction toward the other end. The 2 nd extending projection 72E is a rectangular portion extending and projecting from the other end toward one end in the circumferential direction of the intermittent portion 72G. The 1 st extending projection 72D and the 2 nd extending projection 72E are symmetrically arranged, are separated from each other in the axial direction, and are located at positions partially overlapping in the circumferential direction. Further, slits Q are formed between the tip of the 1 st extending projection 72D and the other end in the circumferential direction of the intermittent portion 72G, and between the tip of the 2 nd extending projection 72E and the one end in the circumferential direction of the intermittent portion 72G, respectively. The widths (lengths in the circumferential direction) of the 2 slits Q are the same length as each other. When the winding yoke 72 is attached to the split core 71, as shown in fig. 17 (b), the inner diameter of the winding yoke body 72A is reduced by an amount corresponding to the above-described gap Q. In other words, by eliminating the gap Q, the circumferential length of the intermittent portion 72G is shortened, and the inner diameter of the winding yoke body portion 72A is shortened by a corresponding amount.

The center coupling portion 72F is interposed between the 1 st extending protrusion 72D and the 2 nd extending protrusion 72E in the axial direction, and extends long in the axial direction. At a time before the winding yoke 72 is assembled to the split core 71, the central connection portion 72F is substantially rectangular in side view as shown in fig. 17 (a). On the other hand, when the diameter of the winding yoke body portion 72A is reduced in order to assemble the winding yoke 72 to the split core 71, the center coupling portion 72F is deformed (distorted) such that the side on one end side in the axial direction of the center coupling portion 72F is shifted from the side on the other end side, as shown in fig. 17 (b). In other words, the central coupling portion 72F is deformed from the state shown in fig. 17 (a) to the state shown in fig. 17 (b), and thereby the wound yoke body portion 72A is reduced in diameter by an amount corresponding to the above-described gap Q. According to the winding yoke 72 having the above-described structure, the split cores 71 in the temporarily assembled state can be smoothly assembled (without disassembling the split cores 71).

The present application has been described with reference to the embodiments, but it should be understood that the present application is not limited to the disclosed embodiments and configurations. Of course, the present application includes various modifications and modifications within an equivalent range. In addition, various elements of the present application are shown in various combinations and forms, but other combinations and forms including more elements than the above elements, fewer elements, or only one of the elements also fall within the scope and spirit of the present application.

Claims

1. A stator constituting a rotating electric machine, characterized in that,

the stator includes:

an annular split core (71) in which core pieces (71A) are arranged in an annular shape in the circumferential direction; and

a strip-shaped winding yoke (72) disposed on the outer peripheral wall surface of the divided core,

the winding yoke is arranged along the circumferential direction of the outer peripheral wall surface of the divided core,

at least one convex portion (72B) is formed at one end portion of the winding yoke,

at least one recess (72C) is formed in the other end of the winding yoke, and the recess engages with the projection in the circumferential direction in a manner facing the projection in a state where the winding yoke is arranged on the outer circumferential wall surface of the split core in the circumferential direction.

2. The stator according to claim 1,

the convex portion is engaged with the concave portion in a state of being pressed against a part of the concave portion.

3. The stator according to claim 2,

the recess has a 1 st hole (223) closer to the opening of the recess and a 2 nd hole (224) farther from the opening than the 1 st hole and communicating with the 1 st hole,

the axial distance of the 1 st hole portion is smaller than the axial distance of the 2 nd hole portion,

a widened part (226) is provided at the tip end part of the convex part, the widened part (226) is formed by flattening the tip end part of the convex part and widening the axial distance to be longer,

the convex portion is engaged with the concave portion in a state where a surface of the widened portion on a base end side of the convex portion is in close contact with a step formed between the 1 st hole portion and the 2 nd hole portion.

4. The stator according to any one of claims 1 to 3,

the axial distance of the opening of the recess is formed to be smaller than the axial distance of the inside,

the front end side of the convex portion is arranged inside the concave portion, and the front end of the convex portion is pressed against a part of a peripheral portion defining the inside of the concave portion,

the base end portion side of the convex portion is configured to have a smaller axial distance than the tip end portion side of the convex portion, and is disposed in the opening of the concave portion.

5. The stator according to any one of claims 1 to 4,

a buffer hole (H2) is formed in at least one of the vicinity of the convex portion and the vicinity of the concave portion.

6. The stator according to claim 1,

the two axial ends of the front end of the convex part are protruded in a claw shape,

the insertion portion of the concave portion is tapered in shape corresponding to the shape of the tip of the convex portion,

the convex part and the concave part are clamped in a snap fit mode.

7. A stator constituting a rotating electric machine, characterized in that,

the stator includes:

a winding yoke (72) disposed on the outer peripheral wall surface of the divided core, and having a strip-shaped plate body in which one end portion and the other end portion of the winding yoke body are connected to each other to form a tubular shape,

one end portion and the other end portion of the winding yoke body portion are connected in the circumferential direction via a rotation tensioning portion (6B), the rotation tensioning portion (6B) being capable of rotating so as to pull one of the one end portion and the other end portion of the winding yoke body portion to the other side or separate the one end portion and the other end portion from the other side,

the winding yoke is press-bonded to an inner peripheral wall surface or an outer peripheral wall surface of the split core.

8. The stator according to claim 7,

the rotation tension part is provided with:

a tabular action part;

one side connecting part which connects one point (P1) of the acting part with one end part of the winding yoke main body part; and

a second side connecting portion connecting the other point (P2) of the acting portion to the other end of the winding yoke body portion,

the other point is formed at a position point-symmetrical to the one point with respect to the center of the action portion.

9. A method of manufacturing a stator, the stator comprising: an annular split core (71) in which core pieces (71A) are arranged in an annular shape in the circumferential direction; and a strip-shaped winding yoke (72) disposed on an outer peripheral wall surface of the split core, the method for manufacturing the stator being characterized by comprising:

a configuration step of looping a band-shaped winding yoke, which has at least one convex portion (72B) formed at one end portion and at least one concave portion (72C) formed at the other end portion to engage with the convex portion, in such a manner that: the winding yoke is made to abut along the outer peripheral wall surface of the split core, and the convex portion and the concave portion are made to abut along the circumferential direction of the outer peripheral wall surface of the split core;

an insertion step of inserting the convex portion into the concave portion; and

and a pressure bonding step of deforming the convex portion by pressure bonding a distal end portion of the convex portion to a peripheral end portion which is a part of the concave portion, thereby engaging the convex portion with the concave portion.

10. The method of manufacturing a stator according to claim 9,

the inserting step and the pressing step are performed in a state where the split cores and the winding yokes wound around the outer peripheral wall surfaces of the split cores are accommodated in accommodating spaces formed between 2 split molds (S1, S2),

the divided cores and the winding yoke in the housing space are held by the 2 divided molds and pressed in the radial direction of the divided cores, so that the convex portions are inserted into the concave portions and the convex portions are engaged with the concave portions.

11. The method of manufacturing a stator according to claim 9 or 10,

absorption holes (H1) are formed in the convex portions,

in the pressure bonding step, the absorbing hole is deformed to deform the tip portion of the convex portion in the concave portion, thereby engaging the convex portion with the concave portion.

12. The method of manufacturing a stator according to claim 9 or 10,

in the crimping step, the convex portion and the concave portion are engaged with each other in a snap-fit manner.

13. The method of manufacturing a stator according to any one of claims 9 to 12,

a temporary assembly step of disposing a columnar jig (T) at the center of the core and disposing the core pieces (71A) in an annular shape around the outer peripheral surface of the jig, prior to the disposition step,

in the disposing step, the inserting step, and the crimping step, the jig is continuously disposed at the core center.

14. A method of manufacturing a stator, the stator comprising: an annular split core (71) in which core pieces (71A) are arranged in an annular shape in the circumferential direction; and a winding yoke (72) disposed on an outer peripheral wall surface of the split core, the method for manufacturing the stator being characterized by comprising:

a placement step of attaching the winding yoke, which is formed in a tubular shape by connecting one end portion and the other end portion of a winding yoke body portion of a strip-shaped plate body and is connected to the outer peripheral wall surface of the split core by a rotating tension portion (6B) that pulls one side to the other side or separates the one side from the other side by rotation, to the split core; and

and a press-bonding step of rotating the rotation tension section to pull or separate one side of the end portion of the winding yoke body portion toward the other side, thereby press-bonding the winding yoke to the outer peripheral wall surface of the split core.