JP2011045178A - Method for manufacturing stator or split stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a stator or a split stator which is capable of efficiently solving an air gap that can be formed on an interface between stator constituents from a coil as a heat-generating source to a stator core, thereby manufacturing the stator or split stator superior in heat dissipation and having high manufacturing efficiency. <P>SOLUTION: The manufacturing method includes: a step in which a spacer 2 is disposed on an inner circumferential surface 1a of the coil 1, the coil 1 having the spacer 2 is fitted to a tooth 31 of the split core 3 and a space K is formed between the tooth 31 and the coil 1 via the spacer 2; a step in which a resin is injected into a molding die to form an insulator 4' and a mold resin body 4 around the space K and the coil 1, respectively, and manufacturing the split stator cores 10; and a step in which the split stator cores 10 are assembled in a circumferential direction to form the split stator 100. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a stator constituting a motor or a divided stator.

  A stator that constitutes a motor (electric motor) includes a stator core having an annular yoke, a plurality of teeth projecting radially inward from the yoke, and a slot formed between adjacent teeth. The stator is formed by being inserted into the slot and wound between the teeth. Further, from the viewpoint of enhancing the ease of coil formation, a divided stator formed by assembling a plurality of divided stator cores in the circumferential direction is generally used at present.

  Recently, with the widespread use of hybrid vehicles and electric vehicles, miniaturization and high performance of drive motors have become important development factors. Even if the motors are miniaturized, their rotational performance or torque performance is maintained. Alternatively, in order to improve, a large current must be passed through the coil, and as a result, the amount of Joule heat increases. This increased heat generation reduces the heat loss and magnetic characteristics of the stator and coil, which leads to a decrease in motor performance, and further decreases the performance of organic insulating materials. It is necessary to dissipate heat. Therefore, the motors for various electric products having high performance and high heat generation, such as the above-mentioned drive motors for hybrid vehicles and electric vehicles, are downsized and high performance (high rotation performance or high torque performance, In addition to high efficiency performance, high heat dissipation performance is required.

  By the way, as a stator having high heat dissipation performance, there is currently a configuration in which the outer periphery of a coil is sealed with a mold resin. For example, as a manufacturing method of a split stator having such a configuration, two manufacturing methods can be given. be able to.

  One of the manufacturing methods is to form a coil by directly winding a conductive wire on a separate bobbin that has been injection-molded or the like, or by fitting a pre-wound coil into the bobbin, and then bobbin with this coil A method of manufacturing a split stator by fitting a plurality of split cores formed with coils via bobbins in the circumferential direction and molding a molded resin body around the coils by injection molding or the like It is.

  A part of the split stator manufactured by this manufacturing method (part corresponding to the split core) is taken out, and a schematic diagram is shown in FIG. 10a, and a bb arrow view of FIG. 10a is shown in FIG. 10b.

  In the figure, each divided core constituting the divided stator is composed of, for example, a yoke Y and a tooth T made of a steel sheet laminate formed by laminating electromagnetic steel sheets, and a bobbin B around which a coil C is wound is a tooth T. The molded resin body M is formed around the coil C.

  When the motor is driven, Joule heat from the coil C, which is a heat generation source, is transferred (dissipated) to the split core (for example, the teeth T) via the bobbin B (X direction in FIG. 10b).

  Here, in the configuration of the illustrated example in which the bobbin B is fitted around the teeth T and the coil C is wound around the bobbin B, the manufacturing tolerance of these constituent members, the assembly tolerance of the members, etc. As a result, air gaps G1 and G2 (the air gap between the core and the bobbin is G1, and the air gap between the bobbin and the coil is G2) as shown in the drawing are extremely likely to be formed at the interface between the members constituting the stator. high. And this air gap becomes interfacial thermal resistance, and becomes a factor which reduces the heat dissipation from the coil C to a core markedly.

  Also, considering the manufacturing man-hours, bobbin molding process, coil formation and winding process, bobbin fitting process in teeth, split stator core assembly process, mold resin body molding process (mold resin injection molding, etc.), etc. However, since the number of man-hours is extremely large, there is a problem that a lot of time is required for the production and the production efficiency is naturally lowered.

  On the other hand, another manufacturing method of a split stator that seals the coil outer periphery with mold resin is not to form the bobbin separately, but to directly integrate the bobbin (insulator) around the teeth by injection molding or the like. In this method, after molding and forming a coil around the molded insulator, a mold resin body is molded around the coil.

  According to this manufacturing method, since the insulator is integrally formed around the teeth, the air gap G1 between the core and the bobbin (insulator) as shown in FIG. 10b is effectively eliminated. However, as shown in FIG. 10b, the air gap G2 between the bobbin and the coil: G2 has not yet been eliminated, and there is still a factor for reducing the heat dissipation.

  Thus, the interfacial thermal resistance between the members, that is, the air gap is mainly caused by the manufacturing tolerance of the member itself and the assembly tolerance of the members. Therefore, in order to eliminate the air gap between the members. In addition to the manufacturing accuracy of the members, it is necessary to further increase the mounting accuracy of the members, and it is easy to understand that the manufacturing difficulty increases as the number of members to be mounted increases.

  Furthermore, since all of the conventional manufacturing methods described above require a large number of manufacturing steps, it is necessary to improve manufacturing efficiency and shorten manufacturing time. In view of the recent increase in demand for hybrid vehicles, this manufacturing time Shortening is an urgent issue.

  Here, when turning to the conventional published technique by the present applicant, even when a crack occurs in the resin mold surrounding the coil, the surface of the resin mold is not cracked so as not to impair the motor function. Patent Document 1 discloses a stator and a motor including a protective layer formed from a highly resinous material.

  However, also in this prior art, the above-described problem, that is, a stator manufacturing method capable of effectively transferring Joule heat from the coil to the core and reducing the manufacturing man-hours to shorten the manufacturing time. It cannot be reached.

JP 2008-178256 A

  The present invention has been made in view of the above-described problems, and can effectively eliminate an air gap that can be formed at an interface between stator constituent members between a coil that is a heat generation source and a stator core. It is an object of the present invention to provide a method for manufacturing a stator or a split stator, which can manufacture a stator or a split stator excellent in performance with high manufacturing efficiency.

  In order to achieve the above object, a method of manufacturing a stator according to the present invention includes a stator core formed of a substantially annular yoke in plan view, teeth projecting radially inward from the yoke, and a coil formed around the teeth. A spacer is arranged on the inner peripheral surface of the coil, the coil including the spacer is fitted to the teeth of the stator core, and the teeth and the coil are interposed via the spacer. A first step of manufacturing an assembly by forming a space between them, a part or all of the assembly is housed in a mold, a resin is injected, an insulator is inserted into the space, and at least the coil It consists of a second step in which a mold resin body is respectively molded around.

  In the stator manufacturing method of the present invention, a mold resin body is formed around a coil. This mold resin body is not only around the coil but also between the teeth of the stator core and the coils formed around the teeth. By filling and curing, the air gap that can be formed between the stator members is effectively eliminated while insulation between the teeth and coils is achieved, and a stator with excellent heat dissipation can be manufactured with high production efficiency. The present invention relates to a manufacturing method that can be performed.

  Therefore, in this embodiment, a spacer made of an insulating material is arranged on the inner peripheral surface of the coil, and the coil including the spacer is fitted into the tooth, so that the tooth is interposed between the tooth and the coil via the spacer. A space is formed, and the resin for forming the mold resin body is filled and cured in this space.

  “At least the mold resin body is formed around the space and the coil” means that the mold resin body is formed on the outer periphery of the coil including the coil end, and in addition, between the conductors forming the coil. Means including a form in which the mold resin body is formed also in the minute gaps of the above, in addition to the form in which the mold resin body is formed in all or a part of the region of the stator core where the coil is not formed, etc. It is.

  The above-mentioned spacers are bonded and fixed to each of the side surfaces of the inner peripheral surface of the coil formed into, for example, a rectangular tube by winding a general conducting wire having a circular cross section or a flat wire (for example, each of the four side surfaces) There is a method of fitting this around the teeth.

  As long as the spacer is formed of an insulating material, the forming material is not limited. For example, by using a spacer formed of the same material as the resin to be molded finally, the space between the coil and the core is used. Familiarity with the mold resin that flows into the space and cures is improved.

  In addition, since the spacer is fixed to the inner peripheral surface of the coil formed by winding a rectangular wire or the like, this spacer prevents the flat wire forming the flat surface from being displaced, and the initial inner dimension Assembling property when fitting the coil maintained with the teeth to the teeth is also good.

  The mold resin cured by flowing into the space between the coil and the core itself becomes an insulator, and moreover, it is filled as compared with a method in which a separately formed insulator is fitted around the coil. The air gap can be effectively eliminated by closing the space between the coil and the core without any gap.

  Further, in the conventional manufacturing method in which the insulator is integrally formed around the teeth by injection molding, even if the air gap between the coil and the insulator can be eliminated, the insulator and the insulator are fitted or wound around in the subsequent process. The air gap that can be formed between the mounted coils cannot be sufficiently eliminated. On the other hand, in the manufacturing method of the present invention, the coil is arranged around the teeth through a space, and then the mold resin is filled and cured in this space, so when this space is closed with the mold resin, The air gap that can occur between the mold resin and the coil can also be effectively eliminated.

  Therefore, a conventional manufacturing method in which a separately formed insulator is fitted around the teeth and a coil is fitted around the insulator, and a conventional manufacturing method in which the insulator is integrally formed around the teeth and the coil is formed around the insulator. All of the air gaps between the stator constituent members, which have not been completely eliminated by any of the methods, can be completely eliminated by this manufacturing method.

  In addition, it is an extremely simple improved manufacturing method in which spacers are placed on the inner peripheral surface of the coil, fitted into the teeth, and filled with mold resin, so manufacturing efficiency is significantly improved compared to conventional manufacturing methods. In addition, the manufacturing time can be shortened.

  It is to be noted that, similarly to the prior art described above, the heat dissipating property of the stator is enhanced also by the configuration in which the mold resin body is formed at least around the coil.

  In another embodiment of the method for manufacturing a stator according to the present invention, a stator core formed of a substantially annular yoke in plan view, teeth projecting radially inward from the yoke, and the teeth are formed. A stator comprising a coil, wherein a spacer is disposed on a peripheral surface of the tooth, a coil is formed on the outer periphery of the spacer, and a space is formed between the tooth and the coil via the spacer. The first step of manufacturing the assembled body, part or all of the assembled body is accommodated in a mold, resin is injected, the insulator is placed in the space, and the molded resin body is at least around the coil. The second step is to form.

  In the manufacturing method of the present embodiment, instead of providing a spacer on the inner peripheral surface of the coil as in the manufacturing method described above, a spacer is provided on the peripheral surface of the tooth and a coil is formed on the outer periphery of the spacer ( For example, a space is formed between the teeth and the coil by fitting.

  Also according to this embodiment, all the air gaps that can occur between the stator components can be effectively eliminated while securing the same effect as the manufacturing method described above, that is, the insulation between the coil and the core. A stator excellent in heat dissipation can be efficiently manufactured.

  A method for manufacturing a split stator according to the present invention includes a yoke having an arc shape in plan view, a split core including a tooth projecting radially inward from the yoke, and a coil formed around the tooth. A method for manufacturing a split stator in which a split stator core is assembled in a circumferential direction, wherein a spacer is disposed on an inner peripheral surface of the coil, and the coil including the spacer is fitted to the teeth of the split core. Then, a space is formed between the tooth and the coil through the spacer to produce an assembly, the first step, a part or all of the assembly is accommodated in a mold, and a resin is injected. A second step of manufacturing the split stator core by forming an insulator in the space and molding a molded resin body at least around the coil, respectively. The by arranging in the circumferential direction to form a stator segment, it is made of the third step.

  The manufacturing method of the present embodiment particularly relates to a manufacturing method of a split stator, and a structure in which a spacer is arranged on the inner peripheral surface of a coil is fitted to teeth of a split core to form a space. A desired number of divided stator cores each having an insulator and a molded resin body are formed around the space and the coil, respectively, and the divided stator cores are assembled in the circumferential direction to produce a divided stator.

  In the method of manufacturing the split stator, each split core has, for example, one tooth, and therefore the fitting efficiency of the coil having the spacer on the inner peripheral surface thereof to the tooth is relatively high. In addition, when the molded resin body constituting the split stator core is manufactured, when the molding resin body is molded by injection molding or the like, since the split core itself is small in size, the molding die itself is also small. Can be used.

  Instead of placing a spacer on the inner peripheral surface of the coil, a method of forming a space by arranging a spacer around the teeth of the split core and arranging a coil on the outer periphery of the spacer may be used. The same applies to the method of manufacturing the split stator.

  Furthermore, another embodiment of the method for manufacturing a split stator according to the present invention is formed around a split core including a yoke having an arc shape in plan view, a tooth projecting radially inward from the yoke, and the teeth. And a split stator core formed by assembling the split stator core in a circumferential direction, wherein a spacer is disposed on an inner peripheral surface of the coil, and the coil including the spacer is connected to the split core. A first step of manufacturing an assembly by forming a space between the teeth and the coil through the spacer, and arranging the assembly in the circumferential direction to provide an intermediate portion of the divided stator. A second step of forming a body, a part or all of the intermediate body is accommodated in a mold, resin is injected, and an insulator is placed in the space at least around the coil. Cold resin body was molded to form respectively divided stator, in which the third step consists.

  In the manufacturing method of the present embodiment, a coil is formed on the outer periphery of the teeth of the split core via a spacer to manufacture an assembly, and this assembly is arranged in the circumferential direction to form an annular core. An insulator and a molded resin body are integrally formed in the space between the core and the coil in each divided core and around the coil.

  In this manufacturing method, instead of placing a spacer on the inner peripheral surface of the coil, a spacer is provided around the teeth of the split core, and a coil is provided on the outer periphery of the spacer to form a space. It may be a method.

  As can be understood from the above description, according to the stator and divided stator manufacturing method of the present invention, regarding the stator manufacturing method in which the mold resin body is formed around the coil, prior to the formation of the mold resin body, By forming a space between the teeth and the coil, and then filling and curing the resin around the space and the coil, the air gap that can be formed between the stator components is effectively eliminated while insulation between the teeth and the coil is achieved. Thus, a stator having excellent heat dissipation can be manufactured with high manufacturing efficiency.

It is the schematic diagram explaining the 1st process of the manufacturing method of the split stator of this invention. (A) is the schematic diagram explaining the 1st process of the manufacturing method of the split stator of this invention following FIG. 1, (b) is the arrow line view seen in the b direction of FIG. 2a. It is the schematic diagram explaining other embodiment of the 1st process. It is the schematic diagram explaining the 2nd process of the manufacturing method of the split stator of this invention. It is a VV arrow line view of FIG. It is the schematic diagram explaining the 3rd process of the manufacturing method of the split stator of this invention. It is the schematic diagram explaining the 2nd process of other embodiment of the manufacturing method of the split stator of this invention. It is the schematic diagram explaining the 3rd process of other embodiment of the manufacturing method of the split stator of this invention. It is a graph which shows the experimental result which compared the electric current value which a stator reaches | attains predetermined temperature when an electric current is supplied to a coil for predetermined time. (A) is the schematic diagram which took out a part (divided core) of the division | segmentation stator manufactured with the conventional manufacturing method, (b) is the bb arrow line view.

  Embodiments of the present invention will be described below with reference to the drawings. In the illustrated example, the method for manufacturing the split stator is described. However, it goes without saying that the manufacturing method of the present invention can be applied to a conventional stator core having an annular shape in plan view. Moreover, although the example of illustration forms a split core from the steel plate laminated body formed by laminating | stacking an electromagnetic steel plate, this split core may be shape | molded from a powder magnetic core.

  1 and 2 are schematic views illustrating a first step of the method for manufacturing a split stator according to the present invention, and FIG. 4 is a schematic view illustrating a second step of the method for manufacturing a split stator according to the present invention. It is.

  First, a coil 1 formed by winding a predetermined number of turns of a coil forming conductor (a flat wire in the illustrated example) is prepared, and a predetermined number of spacers 2 made of an insulating material are installed on the inner peripheral surface 1a of the coil 1.

  Here, for example, in the case of a rectangular tube-shaped coil 1 as shown in the drawing, the spacer 2 is preferably fixed to each of the four inner peripheral surfaces 1a, and the fixing is performed using an adhesive, an adhesive tape, or the like. Can be used.

  In addition, it is preferable to use the same material as the molding resin of the spacer 2 from the viewpoint of familiarity with a molded resin body that is injection-molded in a subsequent process, but it may be molded from a different material. .

  In addition, the terminal 1b at the end of the coil 1 is more specifically projected so as to protrude from one side surface of the coil 1 to a length equal to or greater than the thickness of the molded resin body to be molded in a subsequent process, The finally manufactured divided stator and the power supply source can be lead-connected.

  By fitting the coil 1 having the predetermined number of spacers 2 on the inner peripheral surface 1a to the teeth 31 protruding from the yoke 32 of the split core 3 formed by laminating the electromagnetic steel plates 3 ′,. To manufacture.

  In this assembled body 5, as shown in FIGS. 2 a and 2 b, four spacers 2,... Are interposed between the tooth 31 and the coil 1, thereby forming a space K having a substantially equal width.

  On the other hand, FIG. 3 is a schematic diagram for explaining another embodiment of the first step.

  In this method, in order to form a space K between the tooth 31 and the coil 1 as shown in FIG. 2, instead of fixing the spacer 2 on the inner peripheral surface 1a of the coil 1 as shown in FIG. The spacers 2 are fixed to the four side surfaces.

  As shown in FIG. 3, a split core is prepared in which spacers 2,... Are fixed to teeth 31, and a general coil (having no spacers fixed on its inner peripheral surface) is fitted on the outer periphery of spacers 2,. As a result, an assembly 5 similar to that shown in FIGS. 2a and 2b is formed.

  A part or all of the split core having the coil shown in FIG. 2 is accommodated in a cavity of a molding die (not shown) and injection-molded, so that the coil 1 and the teeth 31, as shown in FIG. Then, the divided stator core 10 in which the molded resin body 4 is molded around a part of the yoke 32 is manufactured.

  Here, as the material resin of the mold resin body 4, unsaturated polyester resin (BMC) having low viscosity during molding and capable of low pressure molding, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polyethylene It is possible to use phthalate (PEN), polyetherimide (PEI), or a material in which a filler such as glass fiber is mixed with these resins.

  When a resin is injected into a mold (not shown), the resin is sufficiently filled in the space K defined by the spacer 2 in addition to being filled between the coil 1 and the cavity wall surface. Is done. The resin filling the space between the coil 1 and the cavity wall is cured to form the mold resin body 4, and the resin filling the space K is cured to form the insulator 4 '. That is, according to this manufacturing method, the molding resin body 4 around the coil and the insulator between the core and the coil are simultaneously molded by one injection molding or the like, compared with the conventional manufacturing method. Thus, the number of manufacturing steps can be reduced and the manufacturing efficiency can be improved.

  5 is a VV arrow view of FIG. When this longitudinal cross-sectional view is compared with FIG. 9b which is a cross-sectional view of a divided stator manufactured by a conventional manufacturing method, the difference in both cross-sectional structures becomes clearer.

  That is, according to this manufacturing method, since the mold resin body 4 on the outer periphery of the coil 1 and the insulator 4 ′ between the core and the coil are integrally formed by injection molding or the like, they are separated as in the conventional manufacturing method. The air gaps G1 and G2 that are generated when the members molded in step 1 are assembled are completely eliminated.

  Therefore, since heat from the coil, which is a heat generation source when the motor is driven, is effectively transferred to the core (for example, the teeth 31), a divided stator with excellent heat dissipation can be obtained.

  A desired number of the divided stator cores 10 shown in FIG. 4 are manufactured, assembled in the circumferential direction, and integrated as a whole through an end cap (not shown), shrink-fitted tube material, and the like, whereby the divided stator 100 is manufactured. (See FIG. 6).

  Moreover, you may use the manufacturing flow of FIGS. 7-8 as manufacturing forms other than the manufacturing flow of FIGS. 4-6.

  In this manufacturing method, a desired number of assembly bodies 5 shown in FIG. 2 are prepared and arranged in the circumferential direction to form a split stator intermediate body 20 (see FIG. 7). The mold resin body 4A is housed in a mold, and the intermediate body 20 is manufactured at once, and the divided stator 100A is manufactured (see FIG. 8).

  Also in this manufacturing method, the cross-sectional structure of each divided core exhibits the cross-sectional structure shown in FIG. 5, and therefore high heat dissipation can be achieved.

  In any of the manufacturing methods described above, it is possible to manufacture a split stator having a cross-sectional structure in which no or almost no air gap exists between the coil and the core, as compared with the conventional manufacturing method. Become.

[Experiments and results comparing the current values at which the stator reaches a specified temperature when a current is passed through the coil for a specified time]
The present inventors manufactured a split stator core by the following two types of manufacturing methods, and when each split stator core reaches 180 ° C. when a large current is passed through the coils constituting both split stator cores for a predetermined time. The current values were measured and compared. The reference value of 180 ° C. is a temperature generally applied as one index of the short-term heat resistance of the stator.

  First, one manufacturing method is related to the manufacturing method of the present invention. Here, after adding a predetermined amount of a styrene monomer (manufactured by Asahi Kasei) to an unsaturated polyester resin (manufactured by Showa Polymer Co., Ltd.), a small amount of a catalyst, a shrinkage regulator and an internal mold release agent are added, and then alumina, aluminum hydroxide In this order, the filler was added, kneaded for 20 minutes with a kneader, finally glass milled fiber was added, and further kneaded for 10 minutes with a kneader to produce a resin for molding.

  The molding resin was compression molded at 150 ° C. to form a molded plate having both sides of 100 mm and a thickness of 2 mm. When the thermal conductivity of this molded plate was measured by the QTM rapid heating method, it was 1.1 W / mK. Furthermore, when the thermal expansion coefficient was measured, between room temperature and 150 degreeC, the average was 15 ppm / K.

  Next, a 2.1 mm × 2.6 mm rectangular wire was used, and a coil in which one layer was a 15-turn rectangular wire was manufactured. At four locations on the inner peripheral surface of this coil (four locations in FIG. 1), a bar-shaped spacer made of PPS resin with a side of 1 mm square is fixed with a room temperature-curing unsaturated polyester resin, and a rectangular wire coil with a spacer is provided. Was made.

  The rectangular wire coil with the spacer described above is fitted into the teeth of the split core having a predetermined shape, and this is accommodated in a molding die uniformly heated to 150 ° C., and the molding resin is injection-molded. A split stator core (Example) as shown in FIG.

  On the other hand, a split stator core (comparative example) is formed by fitting a bobbin in which a coil similar to the above is formed in a conventional manufacturing method, that is, a split core, and a molding resin similar to the above to an injection molding. ).

  While cooling the outer peripheral surface of both split stator cores at a predetermined cooling rate, a large current is passed through the coil, and the current value at which the split stator cores of the example and the comparative example reach 180 ° C. in a predetermined time is measured. did. The result of this experiment is shown in FIG.

From the figure, the divided stator core of the comparative example was 18 (A / cm ² ), whereas the divided stator core of the example was 22 (A / cm ² ), which is 20% or more compared to the comparative example. It was proved to be a split stator core that can carry a large current.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 ... Coil, 1a ... Inner peripheral surface, 1b ... Terminal, 2 ... Spacer, 3 ... Split core, 3 '... Electromagnetic steel plate, 31 ... Teeth, 32 ... Yoke, 4, 4A ... Mold resin body, 4' ... Insulator, 5 ... Assembly, 10 ... Split stator core, 20 ... Intermediate, 100, 100A ... Split stator, K ... Space

Claims (6)

A stator manufacturing method comprising a substantially annular yoke in plan view, a stator core that protrudes radially inward from the yoke, and a coil formed around the teeth,
A spacer is arranged on the inner peripheral surface of the coil, the coil having the spacer is fitted into the teeth of the stator core, and a space is formed between the teeth and the coil through the spacer to produce an assembly. The first step,
A stator comprising a second step of housing a part or all of the assembly in a mold, injecting resin, and molding an insulator in the space and at least a mold resin body around the coil. Manufacturing method. A stator manufacturing method comprising a substantially annular yoke in plan view, a stator core that protrudes radially inward from the yoke, and a coil formed around the teeth,
A first step in which a spacer is disposed on a peripheral surface of the tooth, a coil is formed on the outer periphery of the spacer, and a space is formed between the tooth and the coil via the spacer to manufacture an assembly;
A stator comprising a second step of housing a part or all of the assembly in a mold, injecting resin, and molding an insulator in the space and at least a mold resin body around the coil. Manufacturing method. A divided stator core comprising a yoke having an arcuate shape in plan view, a tooth projecting radially inward from the yoke, and a coil formed around the tooth is assembled in the circumferential direction. A method of manufacturing a split stator,
A spacer is arranged on the inner peripheral surface of the coil, the coil having the spacer is fitted to the teeth of the split core, and a space is formed between the teeth and the coil via the spacer to form an assembly. A first step of manufacturing,
A part or all of the assembled body is accommodated in a mold, resin is injected, an insulator is molded in the space, and a molded resin body is molded at least around the coil to produce a divided stator core, Process,
A method of manufacturing a split stator, comprising a third step of forming the split stator by arranging the split stator core in the circumferential direction. A divided stator core comprising a yoke having an arcuate shape in plan view, a tooth projecting radially inward from the yoke, and a coil formed around the tooth is assembled in the circumferential direction. A method of manufacturing a split stator,
A spacer is arranged on the inner peripheral surface of the coil, the coil having the spacer is fitted to the teeth of the split core, and a space is formed between the teeth and the coil via the spacer to form an assembly. A first step of manufacturing,
A second step of arranging the assembled body in a circumferential direction to form an intermediate body of a split stator;
A part or the whole of the intermediate body is accommodated in a mold, resin is injected, an insulator is formed in the space, and a molded resin body is molded at least around the coil to form a divided stator, A method of manufacturing a split stator, comprising a process. A divided stator core comprising a yoke having an arcuate shape in plan view, a tooth projecting radially inward from the yoke, and a coil formed around the tooth is assembled in the circumferential direction. A method of manufacturing a split stator,
A first step in which a spacer is disposed on a peripheral surface of the tooth, a coil is formed on the outer periphery of the spacer, and a space is formed between the tooth and the coil via the spacer to manufacture an assembly;
A part or all of the assembled body is accommodated in a mold, resin is injected, an insulator is molded in the space, and a molded resin body is molded at least around the coil to produce a divided stator core, Process,
A method of manufacturing a split stator, comprising a third step of forming the split stator by arranging the split stator core in the circumferential direction. A divided stator core comprising a yoke having an arcuate shape in plan view, a tooth projecting radially inward from the yoke, and a coil formed around the tooth is assembled in the circumferential direction. A method of manufacturing a split stator,
A first step in which a spacer is disposed on a peripheral surface of the tooth, a coil is formed on the outer periphery of the spacer, and a space is formed between the tooth and the coil via the spacer to manufacture an assembly;
A second step of arranging the assembled body in a circumferential direction to form an intermediate body of a split stator;
A part or the whole of the intermediate body is accommodated in a mold, resin is injected, an insulator is formed in the space, and a molded resin body is molded at least around the coil to form a divided stator, A method of manufacturing a split stator, comprising a process.

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