JP2012249485A - Stator core manufacturing method, and stator core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a stator core that can be positioned and assembled easily, and a stator core.SOLUTION: When an annular part 3aa of a core material 3a is fitted with a positioning cylindrical part 22b having an outside diameter dimension identical to a width dimension between tooth parts 3ab of the core material 3a, a radial position of the core material 3a can be positioned. When the tooth parts 3ab of the core material 3a is fitted between a pair of positioning pins 22c, 22d at an interval identical to the width dimension between the tooth parts 3ab of the core material 3a, an axial position of the core material 3a can be positioned. When the core material 3a of the stator core 3 is laminated, the radial position and a peripheral position can be easily positioned.

Description

  The present invention relates to a stator core manufacturing method in which a plurality of plate members made of a magnetic material are stacked, and a stator core.

  2. Description of the Related Art Conventionally, a so-called inner rotor type electric motor is known that has a substantially annular stator core fixed between a pair of brackets and a rotor that is rotatably attached to the inside of the stator core in the radial direction.

  As a stator core of this type of electric motor, for example, a technique disclosed in Patent Document 1 is known. The electric motor described in Patent Document 1 uses a stator core in which a plurality of annular plate members made of a magnetic material are laminated in the axial direction. Further, in this electric motor, an annular ring material having an outer diameter size or an inner diameter size different from that of the plate material is laminated on both end portions in the axial direction of the laminated plate material to form a fitting portion. The end of the bracket is fitted and positioned.

  Furthermore, as a stator core of this type of electric motor, for example, a technique disclosed in Patent Document 2 is known. In the electric motor described in Patent Document 2, both end portions of a laminated core formed by laminating plate materials are directly cut to provide an inlay portion (step portion), and the end portion of the bracket is fitted to the inlay portion. To fix the position.

Japanese Utility Model Publication No. 6-41360 Japanese Patent Laid-Open No. 7-7877

  The stator core of the electric motor described in Patent Document 1 described above cannot be easily positioned when a plurality of annular plate members made of a magnetic material are stacked. Moreover, in the case of the ring material laminated | stacked on the both ends of the axial direction of these laminated | stacked board | plate materials, either a board | substrate material differs in either an outer diameter dimension or an internal diameter dimension. For this reason, it is not easy to position when the ring material is laminated on the plate material, and it is not easy to ensure the positioning accuracy when the ring material is attached.

  Furthermore, in the stator core of the electric motor described in Patent Document 2 described above, both ends of the laminated core in which the plate materials are laminated are directly cut to provide positioning spigots. For this reason, the cutting process for cutting this spigot part is needed separately. Therefore, the process at the time of assembling a stator core becomes complicated, and there exists a problem that the assembly of a stator core is not easy.

  An object of the present invention is to solve the above-described problems in the prior art and to provide a stator core manufacturing method that is easy to assemble and a stator core.

  In order to solve the above-mentioned problem, the invention according to claim 1 is constituted by a magnetic material having an annular portion and a plurality of tooth portions extending at an interval on the inner peripheral side of the annular portion. A method of manufacturing a stator core in which a plurality of plate members stacked in the axial direction is a radial positioning portion for positioning the radial position of the annular portion of the plate member, and the circumferential direction of the tooth portion of the plate member A positioning step in which a plurality of plate members are stacked in an axial direction on a positioning jig having a circumferential positioning portion for positioning a position; A stator core manufacturing method comprising: a fixing step of fixing a plurality of fixed plate members; and a removing step of removing the fixed plate members from the positioning jig.

  According to a second aspect of the present invention, in the first aspect of the invention, the laminating step positions the radial position of the annular portion of the plate material by fitting the plate material to the radial position portion of the positioning jig. In addition, a stator core manufacturing method is characterized in that the tooth portions of these plate members are fitted to the circumferential position portions of the positioning jig to locate the circumferential positions of the tooth portions of these plate members. .

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the laminating step is a cylindrical radial positioning having an outer diameter dimension substantially equal to an inner diameter dimension between each tooth portion of the plate material. And a pair of positioning members provided in the axial direction and spaced apart at an interval equal to the width dimension of the teeth portion of the plate material provided on the outer periphery of the radial positioning portion. A stator core manufacturing method comprising: fitting one of the teeth portions of the plate material between the pair of positioning members of the circumferential positioning portion.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein each plate member has a connecting hole penetrating in the axial direction, and the fixing step is a positioning jig. The stator core manufacturing method is characterized in that a plurality of plate members are fixed by pin-shaped fixing members inserted into the connection holes of the plurality of plate members stacked and positioned.

  The invention according to claim 5 is the invention according to claim 4, wherein when the plate member is laminated on the positioning jig, the fixing member is installed at a position where the fixing member is inserted into the connection hole of the plate member. The stacking step is a method for manufacturing a stator core, wherein the plurality of plate members are stacked on the positioning jig, and a fixing member is inserted through a connection hole of each plate member.

  According to a sixth aspect of the present invention, a plurality of plate members made of a magnetic material having an annular portion and a plurality of teeth portions extending at intervals on the inner peripheral side of the annular portion are axially arranged. And a stator core manufacturing method in which a side core having a stepped portion having an outer diameter smaller than the outer diameter of the plate is laminated at the axial ends of the plurality of stacked plates. A positioning jig having a radial positioning portion for positioning the radial position of the side core and the plate material, and a circumferential positioning portion for positioning the circumferential position of the tooth portion of the plate material; , A first side core installation step of installing a side core, a lamination step of laminating the plurality of plate materials in the axial direction on the side core, and a side core different from the side core is installed on the laminated plate materials First A side core installation step, a fixing step of fixing between the side core and the plate material stacked on the positioning jig, a removal step of removing the fixed side core and a plurality of plate materials from the positioning jig, A stator core manufacturing method characterized by comprising:

  According to a seventh aspect of the invention, in the sixth aspect of the invention, the side core is provided with an annular side core annular portion having a stepped portion and an inner circumferential side of the side core annular portion with a space therebetween. A side core teeth portion having an inner diameter equal to that of the tooth portion of the plate material, and the first and second side core installation steps include the step of positioning the side core teeth portion of the side core in the circumferential positioning portion of the positioning jig. The stator core manufacturing method is characterized in that it is fitted to locate the circumferential position of the side core teeth portion.

  The invention according to claim 8 includes a plurality of plate members made of a magnetic material having an annular portion, and a plurality of teeth portions extending at intervals on the inner peripheral side of the annular portion, and the plate member. An annular side core annular portion having a step portion formed to have an outer diameter dimension smaller than the outer diameter dimension, and an inner diameter equal to the teeth portion of the plate material extending at an interval on the inner peripheral side of the side core annular portion Each of the plurality of plate members is laminated in the axial direction, and the annular portion is laminated and fixed concentrically in the axial direction. The side core is attached to an axial end of the plurality of stacked plate members, the side core teeth portion is stacked on the tooth portion of the plate member, and the side core annular portion is concentric with the annular portion of the plate member. Layered Allowed to be fixed, a stator core, characterized in that.

  The invention according to claim 9 is the invention according to claim 8, wherein the side core annular portion of the side core is formed with an outer diameter dimension smaller than the outer diameter dimension of the annular portion of the plate member provided with a stepped portion extending in the circumferential direction. It is the stator core characterized by the above-mentioned.

  The invention according to claim 10 is the invention according to claim 8, wherein the side core annular portion of the side core is formed to have an outer diameter dimension equal to the outer diameter dimension of the plate member by notching the outer peripheral edge and providing a stepped portion. The stator core is characterized by that.

  The invention according to an eleventh aspect is the invention according to any one of the eighth to tenth aspects, wherein the side core and the plate material are respectively concentrically laminated in the axial direction on the side core and the plate material. A connecting hole is formed, and a pin-shaped fixing member is inserted into the connecting hole that is communicated by laminating the side core and the plate material, and the space between the side core and the plate material is fixed. It is a stator core.

  The invention according to claim 12 is the invention according to claim 11, wherein each of the extension positions of the teeth portions in the annular portion of the plate member and the extension positions of the side core teeth portions in the side core annular portion of the side core are provided. Is provided with an insertion portion for fixing the bracket, and the connection hole is an extended position of each tooth portion in the annular portion of the plate member, and an extended position of each side core tooth portion in the side core annular portion of the side core. The stator core is provided at a position separated from the insertion portion.

  According to the invention described in claim 1, by laminating a plurality of plate materials on the positioning jig, the radial position of the annular portion of each plate material is positioned at the radial positioning portion, and the circumferential position The circumferential position of the tooth portion of each plate material is located at the feeding portion. For this reason, it is easy to ensure positioning accuracy when laminating the plate materials, and the laminating process of these plate materials can be facilitated, so that the assembly of the stator core can be facilitated.

  According to the second aspect of the present invention, the radial position of the annular portion of the plate material is positioned by fitting the plate material to the radial positioning portion of the positioning jig. Moreover, the circumferential direction position of the teeth part of these board | plate materials is located by fitting the teeth part of these board | plate materials with the circumferential direction positioning part of a positioning jig | tool. For this reason, the positioning accuracy can be ensured more easily, and the stacking process of the plate materials can be facilitated, so that the stator core can be assembled more easily.

  According to the invention described in claim 3, the plate material is fitted to the cylindrical radial positioning portion of the positioning jig, and the pair of positioning members of the circumferential positioning portion of the positioning jig is between Fit one of the teeth on the plate. As a result, since each of the radial position and the circumferential position of the plate material is positioned and stacked, it is possible to further simplify the stacking process of the plate material ensuring the positioning accuracy.

  According to the invention described in claim 4, the plurality of plate members are fixed between the plurality of plate members by the pin-like fixing members inserted into the connection holes in which the plurality of plate members are stacked and communicated. For this reason, fixing between these board | plate materials can be made easy, ensuring the positioning of these some board | plate materials.

  According to the invention described in claim 5, when the plate member is stacked on the positioning jig, the fixing member is installed at a position where the fixing member is inserted into the connection hole of the plate member, and then the position is set. A plurality of plate materials are stacked on the feeding jig. As a result, since the fixing member is inserted into the connection hole of each plate material, the positioning accuracy when laminating these plate materials on the positioning jig can be further improved, and the operation of inserting the fixing member into the connected connection hole can be performed. Can be unnecessary. Therefore, fixing between the plate members can be facilitated.

  According to the invention described in claim 6, by installing the side core in the positioning jig, the radial position of the side core is positioned at the radial positioning portion of the positioning jig. In addition, by laminating a plurality of plate materials on the side core, the radial position of the plate material is positioned at the radial positioning portion of the positioning jig, and the circumferential positioning position of the positioning jig is Thus, the circumferential position of the plate material is located. As a result, it is possible to easily secure the positioning accuracy when laminating these side cores and plate materials, and the laminating process of laminating these plate materials can be facilitated, so that the assembly of the stator core can be facilitated. Further, by using the stepped portion of the side core in which the positioning accuracy is ensured, for example, positioning when attaching a bracket or the like to the stator core can be facilitated, so that assembly in which the positioning accuracy is ensured can be facilitated.

  According to the seventh aspect of the present invention, the circumferential position of the side core teeth portion is positioned by fitting the side core teeth portion of the side core to the circumferential positioning portion of the positioning jig. . Therefore, the positioning accuracy of each side core with respect to the plate material can be more easily ensured, and the installation process of these side cores can be facilitated, so that the assembly of the stator core can be facilitated.

  According to the invention described in claim 8, the side core teeth portion of the side core is laminated on the tooth portion of the plate material, and the side core annular portion of the side core is laminated concentrically on the annular portion of the plate material. The positioning accuracy of each side core with respect to the plate material can be ensured. Therefore, the positioning accuracy of the plate material and the side core can be easily ensured, and by using the step portions of the side cores, for example, positioning when attaching a bracket or the like to the stator core can be easily performed. For this reason, the assembly which ensured positioning accuracy can be made easy.

  According to the invention described in claim 9, the step provided in the side core annular portion of the side core is provided in the circumferential direction. For this reason, for example, by positioning an end portion of a bracket or the like to a step portion of the side core annular portion, positioning with respect to the side core can be performed more easily.

  According to the tenth aspect of the present invention, the outer peripheral edge of the side core annular portion of the side core is cut out to provide the stepped portion. For this reason, for example, by providing a convex portion corresponding to the step portion of the side core at the end portion of the bracket or the like and fitting the convex portion of the bracket to the step portion of the side core, it is easier to position the side core. it can.

  According to the eleventh aspect of the present invention, the pin-shaped fixing member is inserted into the connecting hole that is communicated by laminating the side core and the plate material, and the side core and the plate material are fixed by the fixing member. As a result, the side core and the plate material can be easily fixed in the positioned state.

  According to the invention described in claim 12, each of the insertion portion and the connection hole is provided at the extended position of each tooth portion in the annular portion of the plate material and the extended position of each side core teeth portion in the side core annular portion of the side core. Is provided. Further, a connecting hole is provided at a position spaced from the insertion portion. Therefore, since the connection hole is provided at a position where the magnetic flux density of the annular part is relatively low, not the teeth part constituting the magnetic circuit, magnetic leakage in the stator core due to the provision of this connection hole can be reduced. Magnetic influence can be reduced.

It is sectional drawing of the electric motor provided with the stator core of the 1st Embodiment of this invention. It is a top view which shows the inner surface of the front bracket attached to the said stator core. It is a perspective view of the said stator core. It is a fragmentary perspective view in the state where a coil was attached to the above-mentioned stator core. It is a perspective view of the positioning jig used for manufacture of the above-mentioned stator core. It is a disassembled front view of the said positioning jig. It is a perspective view of the installation process which installs a fixing member in the lower jig of the positioning jig. It is a top view in the state where the fixing member was installed in the lower jig of the positioning jig. It is a perspective view of the lamination process which laminates | stacks a side core and a board | plate material on the lower jig of the said positioning jig. It is a top view of the state which laminated | stacked the side core and the board | plate material on the lower jig of the said positioning jig. It is a front view in the state where the side core and the plate material were laminated on the lower jig of the positioning jig. It is a perspective view of the state which set the upper jig to the side core and board material which were laminated on the lower jig of the positioning jig. It is a front view of the state which set the upper jig to the side core and board | plate material which were laminated | stacked on the lower jig of the said positioning jig. It is a perspective view of the fixing process which fixes the side core and board | plate material which were laminated | stacked on the said positioning jig. It is sectional drawing of the fixing process of the side core laminated | stacked on the said positioning jig | tool and a board | plate material. It is the elements on larger scale of the said FIG. It is a perspective view of the removal process of the side core laminated | stacked on the said positioning jig and a board | plate material. It is a fragmentary sectional view of the electric motor provided with the stator core of the 2nd Embodiment of this invention. It is a perspective view of the stator core of the 3rd Embodiment of this invention. It is the elements on larger scale of the said stator core.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

<SR motor>
First, the configuration of the SR motor will be described with reference to FIGS.

  As shown in FIG. 1, a switched reluctance motor 1 (hereinafter referred to as an SR motor) is an electric motor having a three-phase structure, and is fixed to a frame of an EV cart (not shown), for example. A sprocket (not shown) is attached to the shaft 2 of the SR motor 1. A chain (not shown) is wound between the sprocket and the drive shaft (not shown). The shaft 2 is a rotating shaft, and the sprocket is rotated by driving the shaft 2 to drive the drive shaft through the chain.

  Specifically, the SR motor 1 includes a stator core 3 that is a hollow, substantially cylindrical stator that also serves as a case body. A front bracket 4 and a rear bracket 5 are attached to both ends of the stator core 3. The front bracket 4 and the rear bracket 5 are side cover brackets as substantially disk-shaped lid members that close both end sides of the stator core 3. Specifically, as shown in FIG. 3, these brackets 4 and 5 are coupled to the stator core 3 by screwing with a plurality of, for example, six set bolts 6 attached at equal intervals in the circumferential direction. Has been. Here, each set bolt 6 is inserted through the stator core 3 and attached. Therefore, the stator core 3 is sandwiched and attached between the front bracket 4 and the rear bracket 5. The stator core 3, the front bracket 4, and the rear bracket 5 constitute a case 1a of the SR motor 1.

  Further, the stator core 3 is configured by laminating a plurality of core members 3a as plate members made of a magnetic material such as an electromagnetic steel plate in the axial direction. Plate-like side cores 3b are laminated at both ends of the laminated core material 3a. Here, the core material 3a includes an annular portion 3aa having an annular shape in plan view, and a plurality of, for example, six teeth portions having a substantially rectangular shape in plan view extending at an interval on the inner peripheral side of the annular portion 3aa. 3ab. The teeth portions 3ab are formed in the same shape as each other, and are provided at equal intervals in the circumferential direction on the inner peripheral edge of the annular portion 3aa. Furthermore, the teeth portion 3ab is provided to project radially toward the center direction of the annular portion 3aa. Further, the distal end portions in the radial direction of the teeth portions 3ab are formed in an arc shape concentric with the annular portion 3aa.

  The annular portion 3aa of each core material 3a is provided with an insertion hole 3ac through which the set bolt 6 is inserted to fix the brackets 4 and 5 to the stator core 3. These insertion holes 3ac are insertion portions for fixing the bracket, and are provided so as to penetrate in the axial direction. Further, these insertion holes 3ac are provided at the intermediate position in the width direction of the portion where the tooth portion 3ab extends from the annular portion 3aa and at a portion spaced radially from the center position. Further, a connecting hole 3ad for inserting a rivet is provided at a position spaced from the insertion hole 3ac in the circumferential direction of the annular portion 3aa. These connecting holes 3ad are provided so as to penetrate in the axial direction, and are provided at positions spaced apart from each adjacent through hole 3ac by a predetermined distance in the same direction. Further, the connection hole 3ad is provided at a substantially intermediate position in the radial direction of the annular portion 3aa, and is provided on the base end side of a portion where the tooth portion 3ab extends from the annular portion 3aa.

  Next, the side core 3b is a plate material made of a magnetic material, like the core material 3a. Specifically, the side core 3b includes an annular side core annular portion 3ba that is annular in plan view, and a plurality of, for example, six sides that are rectangular in plan view and that are extended on the inner peripheral side of the annular side core portion 3ba. And a core teeth portion 3bb. The side core annular portion 3ba is formed with an inner diameter dimension equal to the inner diameter dimension of the annular portion 3aa of the core material 3a. Further, the side core annular portion 3ba is reduced in diameter by cutting the outer peripheral edge of the side core annular portion 3ba in the circumferential direction as compared with the annular portion 3aa of the core material 3a. That is, the side core annular portion 3ba is formed to have an outer diameter slightly smaller than the outer diameter of the annular portion 3aa of the core material 3a. For this reason, when the side core annular portion 3ba is concentrically stacked on the annular portion 3aa of the core material 3a, a stepped peripheral step portion 3bc is formed by the outer peripheral edge of the side core annular portion 3ba. On the other hand, the side core teeth portion 3bb is formed such that the length in the radial direction is equal to the length of the teeth 3ab of the core material 3a. Moreover, the teeth width which is the width dimension of the side core teeth part 3bb is formed smaller than the teeth width of the teeth part 3ab of the core material 3a. For this reason, when the side core 3b is concentrically laminated on the core material 3a, the side core teeth 3bb is formed of a stepped side edge step 3bd by both sides of the side core teeth 3bb in the width direction. Form each one. That is, when the side core 3b is concentrically laminated on the core material 3a, the side core teeth 3bb are configured to be positioned at an intermediate portion in the width direction of the teeth 3ab of the core material 3a. .

  Further, the side core 3b communicates with the insertion hole 3be inserted into the insertion hole 3ac of the core material 3a and the connection hole 3ad of the core material 3a when the side core 3b is concentrically stacked on the core material 3a. A connecting hole 3bf is provided. Each of the insertion hole 3be and the connection hole 3bf is formed in the same size as the insertion hole 3ac and the connection hole 3ad of the core material 3a.

  Further, the side cores 3b are concentrically stacked on both end sides of the plurality of core members 3a that are concentrically stacked in the axial direction, and the connecting holes 3ad and 3bf that are concentrically communicated with each other have pin shapes as fixing members. Rivets 3c are inserted and fixed. For this reason, these rivets 3c position and fix the side core 3b and the core material 3a to each other. Further, these rivets 3c are formed with a head 3cb having an enlarged diameter at one end of an elongated cylindrical shaft portion 3ca. The head 3cb is formed to have an outer diameter larger than the inner diameter of each of the coupling holes 3ad and 3bf. One end portion of the shaft portion 3ca opposite to the side where the head portion 3cb of the rivet 3c is provided is a tip portion 3cc.

  Furthermore, these rivets 3c are inserted into the connecting holes 3ad, 3bf that are communicated with each other, and the shafts 3ca are inserted into the connecting holes 3ad, 3bf, and the heads 3cb are locked to one ends of the connecting holes 3ad, 3bf. It is formed in a length dimension so that the tip portion 3cc protrudes from the other end side. In this state, the tip portion 3cc is crushed and deformed to an outer diameter larger than the communication holes 3ad, 3bf to form a crimped portion 3cd, and the side core 3c and the core material 3a stacked concentrically are fixed.

  Next, the front bracket 4 is attached to the front side in the axial direction of the stator core 3 from which the shaft 2 protrudes. The front bracket 4 has an annular peripheral portion 4a formed to have an outer diameter dimension equal to the outer diameter dimension of the core material 3a of the stator core 3. And the fitting step part 4b is provided in the front-end edge of the side attached to the stator core 3 of this peripheral part 4a. The fitting step 4b is formed by cutting out the inner peripheral side of the tip edge of the peripheral edge 4a in a step shape. Further, the fitting step 4b is formed such that the thickness dimension in the radial direction is equal to the difference between the outer diameter dimension of the core material 3a of the stator core 3 and the outer diameter dimension of the side core 3b. Furthermore, the fitting step portion 4 b is formed such that the axial length dimension is equal to the thickness dimension of the side core 3 b of the stator core 3. Therefore, when the front bracket 4 is attached to the axial end portion of the stator core 3, the fitting step portion 4 b is fitted with an inlay with the peripheral step portion 3 bc of the stator core 3. For this reason, the fitting step 4b is provided in order to enable the front bracket 4 to be accurately positioned concentrically with the stator core 3.

  Further, on the inner peripheral edge of the peripheral edge portion 4 a of the front bracket 4, when the front bracket 4 is fitted to the stator core 3, a cylindrical bolt fastening screw portion 4 c that communicates with the insertion holes 3 ac and 3 be of the stator core 3. Is provided. These bolt fastening screw portions 4 c are provided at positions spaced apart at equal intervals along the circumferential direction of the front bracket 4. Moreover, the screw part 4c for bolt fastening is formed with a thread groove on the inner periphery, so that the set bolt 6 can be screwed. Here, a step 4 d is provided inside the peripheral edge 4 a of the front bracket 4. When the front bracket 4 is fitted to the stator core 3, the step portion 4 d accommodates the head 3 cb or the caulking portion 3 cd of the rivet 3 c that is attached by being inserted through the connection holes 3 ad and 3 bf of the stator core 3. Is done. In other words, each insertion hole 3ac, 3be of the stator core 3 is positioned adjacent to the bolt fastening screw portion 4c of the front bracket 4 in a state where the front bracket 4 is fitted to the stator core 3. It is provided so as to be located inside the stepped portion 4 d of the bracket 4.

  A through hole 4 e is provided at the center of the front bracket 4. Further, a first ball bearing 4f as a bearing member is attached inside the front bracket 4 so as to be concentrically connected to the through hole 4e.

  Next, the rear bracket 5 is attached to the rear side of the stator core 3, which is the side opposite to the side to which the front bracket 4 is attached. The rear bracket 5 is provided with a peripheral edge portion 5a, a fitting step portion 5b, a bolt insertion portion 5c, and a step portion 5d having the same configuration as that of the front bracket 4. Further, a bearing hole 5 e serving as a through hole is provided at the center of the rear bracket 5. A second ball bearing 5f as a bearing member is attached in the bearing hole 5e.

  Furthermore, a bolt mounting hole (not shown) is provided in the end surface portion 5g inside the step portion 5d of the rear bracket 5. For example, about six bolt mounting holes are provided at equal intervals in the circumferential direction. And the terminal bolt 7 as a connection member is each inserted and attached to these bolt attachment holes.

  A coil bobbin 8 is attached to each salient pole 3d formed by laminating the teeth 3ab of the core material 3a of the stator core 3 and the side core teeth 3bb of the side core 3b. These coil bobbins 8 are provided with rectangular openings 8a having a width dimension equal to the width dimension of the teeth 3ab of the core material 3a and a length dimension equal to the thickness dimension of the stator core 3 in the axial direction. Yes. A coil bobbin 8 is attached to the opening 8 a by fitting the salient pole 3 d of the stator core 3. Further, a coil 9 is wound around the outer periphery of these coil bobbins 8. These coils 9 are formed by winding a conductive wire (not shown) as a conductive wire, and the end of this conductive wire is electrically and electrically connected to the end of the terminal bolt 7 on the front end side located in the rear bracket 5. Mechanically connected.

  A shaft 2 that is rotatable relative to the stator core 3 is attached to the inside of the stator core 3. The shaft 2 is rotatably mounted by fitting both end sides of the shaft 2 into the first ball bearing 4f and the second ball bearing 5f. A plurality of substantially cross-shaped plate members (not shown) formed of a magnetic material such as an electromagnetic steel plate are inserted into the shaft 2 and attached thereto. And each of these plate materials forms a rotor core 11 as a rotor. Each plate material of the rotor core 11 is fixed so as not to rotate relative to the shaft 2. The rotor core 11 has a total of four salient poles 11 a that project radially from the shaft 2 toward the stator core 3. These salient poles 11 a are attached to face the salient poles 3 d of the stator core 3.

<Assembly jig>
Next, an assembly jig used for manufacturing the stator core 3 of the SR motor 1 will be described with reference to FIGS.

  As shown in FIG. 5, the assembly jig 21 for the stator core 3 is a positioning jig for centering used when the core material 3a and the side core 3b are laminated in the axial direction. The assembly jig 21 includes a pair of a lower jig 22 and an upper jig 23. Specifically, the lower jig 22 includes a flat plate portion 22a having a substantially rectangular flat plate shape. As for this flat plate part 22a, one side surface located in the upper side is formed flat, and it is set as installation surface 22aa. A cylindrical positioning cylinder portion 22b as a radial positioning portion projects from the center portion of the installation surface 22aa. The positioning cylinder 22b is attached along the axial direction of the perpendicular of the installation surface 22aa. Here, this positioning cylinder part 22b is formed in the outer diameter dimension equal to the space | interval dimension between the teeth parts 3ab which the core material 3a mutually faces. That is, the positioning cylinder portion 22b is formed to have an outer diameter dimension substantially equal to the inner diameter dimension of the tip side of each tooth portion 3ab of the core material 3a. Accordingly, the positioning cylinder portion 22b is placed on the installation surface 22aa of the flat plate portion 22a while fitting the core material 3a to the positioning cylinder portion 22b, thereby setting the radial direction of each core material 3a. Position it. For this reason, the positioning cylinder portion 22b positions the radial direction of the side core 3b even when the side core 3b is fitted.

  Further, the positioning cylinder portion 22 b is formed to have a height dimension slightly larger than the thickness dimension of the stator core 3. Therefore, the positioning cylinder portion 22b is positioned above one end surface of the uppermost side core 3b in a state where a predetermined number of core materials 3a and a pair of side cores 3b are stacked on the positioning cylinder portion 22b. The upper end surface 22ba of the cylindrical portion 22b is formed so as to protrude. A screwing hole 22bb is provided in the center of the positioning cylinder portion 22b along the axial direction of the positioning cylinder portion 22b. The screwing hole 22bb is formed in a concave cross section with a thread groove formed on the inner peripheral surface and in a circular shape in plan view.

  In addition, a pair of positioning pins 22c and 22d as positioning members project from the installation surface 22aa of the flat plate portion 22a. The pair of positioning pins 22c and 22d are circumferential positioning portions that locate the circumferential positions of the core material 3a and the side core 3b. Specifically, the pair of positioning pins 22c and 22d are located on the outer periphery of the positioning cylinder portion 22b, and are provided at positions spaced from the positioning cylinder portion 22b at equal intervals. Further, the pair of positioning pins 22c and 22d are protruded in the axial direction with a spacing equal to the width of the tooth portion 3ab of the core material 3a, and are vertically installed on the installation surface 22aa of the flat plate portion 22a. Has been. That is, the positioning pins 22c and 22d are configured such that when the core material 3a is fitted into the positioning cylinder portion 22b and the tooth portion 3ab of the core material 3a is fitted between the pair of positioning pins 22c and 22d, the core The circumferential position of the material 3a is located. Therefore, the positioning pins 22c and 22d substantially position the circumferential direction of the side core 3b even when the side core 3b is fitted. The pair of positioning pins 22c and 22d is provided in a total of two pairs at positions facing each other about the central axis of the positioning cylinder portion 22b. Further, these positioning pins 22c and 22d have a height dimension larger than the height dimension of the positioning cylinder portion 22b. Therefore, as shown in FIG. 6, the positioning pins 22c and 22d are configured such that the upper end portions 22ca and 22da of the positioning pins 22c and 22d protrude above the upper end surface 22ba of the positioning cylinder portion 22b. Has been. Here, when the upper jig 23 has a sufficient thickness dimension, the upper end surface 22b of the positioning cylinder 22b protrudes upward from the upper ends 22ca and 22da of the positioning pins 22c and 22d. May be.

  Further, the installation surface 22aa of the flat plate portion 22a is provided with an upstanding recess 22e having a concave cross section for allowing the rivet 3c to stand up on the installation surface 22aa. The standing recess 22e is formed in a circular shape in plan view having an inner diameter dimension substantially equal to the outer diameter dimension of the head 3cb of the rivet 3c, and a plurality of, for example, six are provided on the installation surface 22aa of the flat plate portion 22a. It has been. Each of the standing recessed portions 22e is provided at a position that is a predetermined distance away from the center position of the positioning cylinder portion 22b, and is spaced apart at equal intervals in the circumferential direction of the positioning cylinder portion 22b. Specifically, each of the standing recesses 22e is provided at a position away from the center position of the positioning cylinder portion 22b by a distance equal to the distance from the center position of the core material 3a to the connection hole 3bf. Furthermore, each standing recessed part 22e is in a state in which the core material 3a is fitted into the positioning cylinder part 22b, and the teeth part 3ab is fitted between the pair of positioning pins 22c and 22d and installed on the installation surface 22aa. The core material 3a is provided at a position concentrically communicating with each connection hole 3ad of the core material 3a.

  Here, each rivet 3c is erected vertically by fitting the head 3cb of each rivet 3c into the erecting recess 22e of the lower jig 22. In this state, when the core material 3a and the side core 3b are installed on the installation surface 22aa of the lower jig 22, the rivets 3c are inserted into the connecting holes 3ad and 3bf of the core material 3a or the side core 3b, and the core material 3a and The radial position and the circumferential position of the side core 3b are located. Therefore, these rivets 3c also have a radial positioning portion and a circumferential position for positioning the radial position and the circumferential position of the core material 3a and the side core 3b, similarly to the positioning cylinder portion 22b and the positioning pins 22c and 22d. It functions as a feeding part.

  On the other hand, the upper jig 23 includes a substantially rectangular flat plate portion 23 a having the same shape as the flat plate portion 22 a of the lower jig 22. A flat fitting surface 23aa is provided on one side surface located below the flat plate portion 23a. And as shown in FIG. 15, the fitting recessed part 23b of the cross-sectional concave shape which the upper end surface 22ba of the positioning cylinder part 22b of the lower jig 23 fits is provided in the center part of this fitting surface 23aa. . The fitting recess 23b is formed in a circular shape in plan view having an inner diameter dimension equal to the outer diameter dimension of the positioning cylinder portion 22b. The fitting recess 23b is a positioning cylinder portion 22b that protrudes upward from the upper side surface of the side core 3b located in the uppermost layer in a state in which a predetermined number of core materials 3a and side cores 3b are fitted to the lower jig 22. The depth dimension is slightly larger than the length dimension of the upper end portion 22ba. Further, a through hole 23c penetrating in the thickness direction of the flat plate portion 23a is provided at the center of the fitting recess 23b. The through-hole 23c communicates concentrically with the screwing hole 22bb of the positioning cylinder 22b when the positioning cylinder 22b of the lower jig 22 is fitted into the fitting recess 23b of the upper jig 23. It is provided in the position to do. The through hole 23c is formed to have an inner diameter that is slightly larger than the inner diameter of the screwing hole 22bb of the positioning cylinder portion 22b.

  Further, the fitting surface 23aa of the upper jig 23 is provided with a positioning concave portion 23d having a concave cross section for fitting the upper end portions 22ca and 22da of the positioning pins 22c and 22d of the lower jig 22. A total of four positioning recesses 23d are provided on the fitting surface 23aa, and are formed in a circular shape in plan view having an inner diameter that is equal to the outer diameter of the positioning pins 22c and 22d. Specifically, the positioning recesses 23d are formed on the positioning pins 22c and 22d of the lower jig 22 in a state where the fitting recesses 23b of the upper jig 23 are fitted to the positioning cylinders 22b of the lower jig 22. Upper end portions 22ca and 22da are provided at positions where they are fitted.

  Further, the fitting surface 23aa of the upper jig 23 is fitted with rivets 3c that are erected in the respective standing recesses 22e of the lower jig 22, and the tip portions 3cc of these rivets 3c are crushed into the caulking portions 3cd. A caulking hole 23e is provided for deformation. Six caulking holes 23e are provided on the fitting surface 23aa in total, and are provided so as to penetrate in the thickness direction of the flat plate portion 23a of the upper jig 23. Further, the caulking hole 23e has an inner diameter that is slightly larger than the outer diameter of the shaft portion 3ca of the rivet 3c. Therefore, the caulking hole 23e is formed to have an inner diameter dimension capable of inserting the distal end portion 24a of the cylindrical punch 24 that can be squeezed and expanded in diameter by crushing the distal end portion 3cc of the rivet 3c. Specifically, the caulking hole 23e is erected in the standing recess 22e of the lower jig 22 in a state in which the fitting recess 23b of the upper jig 23 is fitted to the positioning cylindrical portion 22b of the lower jig 22. Further, the tip portion 3cc of the rivet 3c is provided at a position where it is fitted concentrically.

  Further, a fixing screw 25 for fixing the upper jig 23 to the lower jig 22 can be attached to the through hole 23 c of the upper jig 23. The fixing screw 25 has a cylindrical shaft portion 25a. The shaft portion 25a has a length dimension substantially equal to the thickness dimension of the flat plate portion 23a of the upper jig 23 and is formed to have an outer diameter dimension equal to the inner diameter dimension of the through hole 23c. A head 25b having an outer diameter larger than the outer diameter of the shaft 25a is concentrically provided on the proximal end side of the shaft 25a. The head portion 25b is formed to have an outer diameter dimension larger than the inner diameter dimension of the through hole 23c, and a hexagonal hexagon bolt fixing portion 25c having a hexagonal shape in plan view is provided on an end surface of the head portion 25b. Further, a cylindrical screw portion 25d having a thread groove formed on the outer peripheral surface is provided concentrically on the distal end side of the shaft portion 25a opposite to the side on which the head portion 25b is provided. The thread portion 25d is formed to have an outer diameter dimension slightly smaller than the outer diameter dimension of the shaft portion 25a. Then, the screw portion 25d is configured such that the positioning recess 22b of the upper jig 23 is fitted into the positioning cylinder portion 22b of the lower jig 22, and the shaft portion 25a of the fixing screw 25 is inserted into the through hole 23c of the upper jig 23. In this state, it is screwed into the screwing hole 22bb of the positioning cylinder portion 22b.

<Manufacturing method of stator core>
Next, a method for manufacturing the stator core 3 using the assembly jig 21 will be described with reference to FIGS. 3 and 7 to 17.

(Rivet setting process)
First, when manufacturing the stator core 3, as shown in FIG. 7, the positioning cylinder portion 22 b of the lower jig 22 from which the upper jig 23 is removed is directed upward. In this state, the head 3ca of the rivet 3c is fitted into each of the standing recessed portions 22e of the flat plate portion 22a of the lower jig 22, and each of these rivets 3c is vertically placed as shown in FIG. To stand.

(First side core installation process)
Next, as shown in FIG. 9, the positioning cylinder portion 22b of the lower jig 22 is fitted into the inner space between the side core teeth portions 3bb of the side core annular portion 3ba of the side core 3b, and the side core 3b is attached to the lower jig. It is made to mount on 22 mounting surface 22aa. At this time, one of the side core teeth 3bb of the side core 3b is fitted between the pair of positioning pins 22c and 22d. At the same time, the rivets 3c erected in the erected recesses 22e of the flat plate portion 22a are inserted into the connection holes 3bf of the side core 3b. As a result, the radial position of the side core 3b is positioned by fitting the positioning tube 22b of the lower jig 22 into the inner space of each side core tooth portion 3bb of the side core 3b. Further, the side core teeth portion 3bb of the side core 3b is fitted between the pair of positioning pins 22c and 22d, and the rivets 3c erected on the standing recesses 22e are inserted into the connection holes 3bf of the side core 3b. As a result, the circumferential position of the side core 3b is located.

(Core lamination process)
Next, the annular portion 3aa of the core material 3a is fitted into the positioning cylinder portion 22b of the lower jig 22 on which the side core 3b is installed, and one of the tooth portions 3ab of the core material 3a is positioned as a pair. It fits between pins 22c and 22d. At the same time, the rivets 3c erected in the erected recesses 22e are inserted into the connecting holes 3ad of the core material 3a, and the core material 3a is inserted on the mounting surface 22aa of the lower jig 22. It is laminated on the placed side core 3b.

  Here, the core material 3a is similarly positioned in the radial direction of the core material 3a by fitting the annular portion 3aa of the core material 3a to the positioning tube portion 22b. Further, by fitting the teeth 3ab of the core material 3a between the pair of positioning pins 22c and 22d, and inserting the rivets 3c erected on the standing recesses 22e into the connecting holes 3ad of the core 3a. The circumferential position of the core material 3a is located.

  Thereafter, the stacking process of the core material 3 is repeated, and a predetermined number of core materials 3 a are sequentially stacked in the axial direction on the side core 3 b installed on the mounting surface 22 aa of the lower jig 22. As a result, the predetermined number of core members 3a are positioned in the radial position and the circumferential position of each core member 3a by the positioning cylinder portion 22b of the lower jig 22, positioning pins 22c and 22d, and the rivets 3c. . In this state, the core materials 3a are laminated concentrically in the axial direction.

(Second side core installation process)
Further, as shown in FIGS. 10 and 11, the side core annular portion 3ba of another new side core 3b is fitted into the positioning cylinder portion 22b of the lower jig 22 on which a predetermined number of core materials 3a are laminated. At this time, any one of the side core teeth 3bb of the side core 3b is fitted between the pair of positioning pins 22c and 22d, and each rivet 3c erected in each standing recess 22e is connected to each connecting hole of the side core 3b. 3bf is fitted and inserted. Then, the side core 3b is concentrically laminated in the axial direction on the core material 3a laminated on the uppermost side of the lower jig 22.

  Here, the side core 3b is similarly positioned in the radial direction by the positioning cylinder portion 22b of the lower jig 22, and is positioned in the circumferential direction by the pair of positioning pins 22c and 22d and the rivets 3c. .

  At this time, the positioning cylinder portion 22b of the lower jig 22, the positioning pins 22c and 22d, and the rivet 3c are located above the upper end surfaces of the core material 3a and the side core 3b stacked on the lower jig 22. It will be in the state of protruding.

(Temporary fixing process)
Next, as shown in FIGS. 12 and 13, the upper jig 23 is fitted onto the lower jig 22 installed by laminating a predetermined number of core materials 3 a between the pair of side cores 3 b. At this time, the upper end portion 22ba of the positioning cylinder portion 22b of the lower jig 22 is fitted into the fitting concave portion 23b of the upper jig 23. As a result, the screwing hole 22bb of the positioning cylinder portion 22b communicates concentrically with the through hole 23c of the upper jig 23. At the same time, the upper end portions 22 ca and 22 da of the positioning pins 22 c and 22 d of the lower jig 22 are fitted into the positioning recesses 23 d of the upper jig 23, and the tip portions of the rivets 3 c erected on the lower jig 22 3 cc is fitted into the caulking hole 23 e of the upper jig 23.

  Thereafter, the screw portion 25d of the fixing screw 25 is inserted into the through hole 23c of the upper jig 23, and this screw portion 25d is screwed and fixed to the screwing hole 22bb of the positioning cylinder portion 22b of the lower jig 22. . As a result, the pair of side cores 3b and the predetermined number of core members 3a stacked on the lower jig 22 are sandwiched and temporarily fixed between the upper jig 23 and the lower jig 22. Therefore, by sandwiching the upper jig 23 and the lower jig 22, the predetermined number of core members 3a and the pair of side cores 3b are positioned at the radial position and the circumferential position, respectively, and temporarily moved in the axial direction. Fixed.

(Riveting process)
In this state, as shown in FIGS. 14, 15, and 16, the tip 24 a of the punch 24 is inserted into the caulking hole 23 e of the upper jig 23. In this state, the base end portion of the punch 24 is struck with a hammer (not shown) or the like to deform the tip portion 3cc of the rivet 3c accommodated in the caulking hole 23e of the upper jig 23. The caulking portion 3cd has a larger outer diameter than the outer diameter of the shaft portion 3ca of the rivet 3c. As a result, a predetermined number of core members 3a and a pair of side cores 3b positioned in the radial direction and the circumferential direction are fixed in the axial direction.

(Removal process)
Then, as shown in FIG. 17, the screw portion 25 d of the fixing screw 25 is removed from the screwing hole 22 bb of the positioning cylinder portion 22 b of the lower jig 22, and the upper jig 23 is removed from the lower jig 22. Thereafter, the pair of side cores 3b and a predetermined number of core members 3a are removed from the positioning cylinder portion 22b of the lower jig 22 and the positioning pins 22c and 22d, whereby the stator core 3 shown in FIG. 3 is manufactured.

  As described in detail above, according to the first embodiment, when the assembly jig 21 is used when the core material 3a of the stator core 3 is laminated, the radial position and the circumferential position of the core material 3a are determined. Each can be located easily. Specifically, the diameter of the core material 3a is obtained by fitting the annular portion 3aa of the core material 3a to the positioning cylinder portion 22b having an outer diameter dimension equal to the width dimension between the tooth portions 3ab of the core material 3a. The direction position can be located. At the same time, any one of the tooth portions 3ab of the core material 3a is fitted between a pair of positioning pins 22c and 22d spaced at equal intervals to the width dimension between the tooth portions 3ab of the core material 3a. The axial position of the material 3a can be located.

  Furthermore, when the tooth portion 3ab of the core material 3a is fitted to the pair of positioning pins 22c and 22d and placed on the placement surface 22aa of the lower jig 22, the connection holes 3ad of the core material 3a are positioned. A rivet 3c is erected at each of the locations to be performed. For this reason, when this core material 3a is installed on the mounting surface 22aa of the lower jig 22, the rivet 3c can be inserted into each connecting hole 3ad of the core material 3a. As a result, the rivets 3c can also position the circumferential position of the core material 3a, so that the positioning accuracy when the core material 3a is stacked on the mounting surface 22aa of the lower jig 22 can be further improved.

  Therefore, by using the assembly jig 21, it is possible to easily ensure the positioning accuracy when the predetermined number of core materials 3a constituting the stator core 3 are laminated in the axial direction. And the positioning operation | work at the time of laminating | stacking these predetermined number of core materials 3a can be simplified. As a result, the stacking process of the core material 3a that secures the positioning accuracy can be facilitated and simplified, so that the assembly of the stator core 3 can be facilitated and the manufacturability of the stator core 3 can be improved.

  In addition, after the rivets 3c are erected in advance in the standing recesses 22e provided in the lower jig 22 of the assembly jig 21, a predetermined number of core members 3a are sequentially placed on the mounting surface 22aa of the lower jig 22. Laminate. Then, the core material 3a is laminated on the mounting surface 22aa of the lower jig 22 while the rivets 3c are inserted into the communication holes 3ad of the core material 3a. Then, after the upper jig 23 is fitted to the lower jig 22 installed by laminating these core materials 3 a, the upper jig 23 is screwed and fixed to the lower jig 22 with the fixing screw 25. As a result, it is possible to temporarily fix the plurality of core materials 3a stacked with the radial position and the circumferential position positioned.

  Furthermore, a rivet 3c is inserted and attached to each connection hole 3ad of the core material 3a temporarily fixed between the upper jig 23 and the lower jig 22. For this reason, the front end portion 24a of the punch 24 is inserted from the caulking hole 23e of the upper jig 23, and the front end portion 3cc of the rivet 3c is deformed by, for example, crushing to expand the diameter to obtain a caulking portion 3cd. As a result, the radial position and the circumferential position are located, and the core material 3a sandwiched between the upper jig 23 and the lower jig 22 can be fixed in the axial direction.

  Therefore, when the radial position and the circumferential position of the core material 3a are located, the rivets 3c are inserted and attached to the core material 3a. For this reason, compared to the case where the radial position and the circumferential position of the laminated core material 3a are located and then a fixing member such as a rivet 3c is inserted and fixed in the connection hole 3ad of the core material 3a. The operation of inserting the rivet 3c through the connecting hole 3ad and attaching it can be made unnecessary. As a result, the connecting step in the axial direction of the core material 3a can be facilitated, and the axial fixing of the core material 3a in the positioned state can be facilitated.

  The side core teeth 3ba have the same shape as the annular portion 3aa of the core material 3a except that the outer diameter is slightly small. The side core teeth have the same shape as the teeth portion 3ab of the core material 3a except that the width is slightly smaller. A side core 3b having a portion 3bb is provided. The side cores 3b are laminated on both sides of a predetermined number of laminated core members 3a. As a result, when the side core 3b is installed on the mounting surface 22aa of the lower jig 22 of the assembly jig 21, the side core annular part 3ba of the side core 3b is fitted to the positioning cylinder part 22b of the lower jig 22. The radial position of the side core 3b can be located. At the same time, the side core teeth portion 3bb of the side core 3b is fitted between the pair of positioning pins 22c, 22d of the lower jig 22, and each rivet 3c erected on the mounting surface 22aa of the lower jig 22 is connected to the side core 3b. The side core 3b can be positioned in the circumferential direction by being inserted into the connecting holes 3bf.

  Therefore, even in the stator core 3 in which the side cores 3b are laminated on both sides of the predetermined number of the laminated core materials 3a, by using the assembly jig 21, the radial positions and the circumferences of the core material 3a and the side cores 3b can be reduced. Stacking is possible while positioning the direction. Therefore, it is possible to easily secure the positioning accuracy when laminating the core material 3a and the side core 3b, and it is possible to simplify the stacking process of the core material 3a and the side core 3b that secures the positioning accuracy. Therefore, assembly of the stator core 3 can be facilitated.

  Further, a side core 3b having a side core annular portion 3ba having a slightly smaller outer diameter is laminated concentrically in the axial direction of the core material 3a. As a result, a stepped peripheral edge portion 3bc is formed between the outer periphery of the side core annular portion 3ba of the side core 3b and the outer periphery of the annular portion 3aa of the core material 3a. Then, the peripheral step portion 3bc of the side core 3b that is assembled by the assembly jig 21 and the positioning accuracy with respect to the core material 3a is secured, and the inner peripheral side of the front end edge of the peripheral portions 4a and 5a of the brackets 4 and 5 is stepped. It is made to fit in the fitting step part 4b, 5b formed in the shape. As a result, positioning when the brackets 4 and 5 are attached to the stator core 3 can be facilitated, and assembly of the SR motor 1 in which positioning accuracy is ensured can be facilitated. Therefore, it is possible to eliminate the positioning machining after the brackets 4 and 5 are attached to the stator core 3. Therefore, the cost of the SR motor 1 can be reduced, and the lead time when the SR motor 1 is assembled. Can be shortened.

  At the same time, the outer diameters of the brackets 4 and 5 can be made smaller than when the brackets 4 and 5 are directly fitted to the outer peripheral edge of the laminated core material 3a. Further, since the outer diameter of each of the brackets 4 and 5 can be made equal to the outer diameter of the stator core 3, the SR motor 1 can be reduced in size.

  Further, the communication holes 3ad and 3bf of the core material 3a and the side core 3b were separated from the adjacent insertion holes 3ac and 3be in the same direction. Further, the communication holes 3ad and 3bf are substantially in the radial direction of the annular portion 3aa or the side core annular portion 3ba, and the tooth portion 3ab or the side core teeth portion 3bb extends from the annular portion 3aa or the side core annular portion 3ba. It was provided on the base end side of the part to be. As a result, the communication holes 3ad and 3bf are provided in the teeth 3ab and the side core teeth 3bb which are not included in the teeth 3ab and the side core teeth 3bb constituting the magnetic circuit of the core material 3a and the side core 3b. Therefore, the communication holes 3ad and 3bf are provided at positions on the base end side of the tooth portion 3ab or the side core teeth portion 3bb having a relatively low magnetic flux density of the annular portion 3aa and the side core annular portion 3ba. For this reason, the magnetic leakage of the stator core 3 due to the provision of the communication holes 3ad and 3bf can be reduced, so that the magnetic influence associated with the provision of the communication holes 3ad and 3bf can be reduced.

  As shown in FIGS. 2 and 3, when the brackets 4 and 5 are fitted to the stator core 3, they are adjacent to the bolt fastening screw portions 4c and the bolt insertion portions 5c of the brackets 4 and 5, and The insertion holes 3ac and 3be of the side core 3b and the core material 3a are provided at positions facing the step portions 4d and 5d of the brackets 4 and 5, respectively. For this reason, the head 3cb or the caulking portion 3cd of the rivet 3c attached by being inserted through the connection holes 3ad, 3bf is not leveled between the brackets 4, 5 when the brackets 4, 5 are fitted to the stator core 3. It is accommodated in the parts 4d and 5d. For this reason, when these brackets 4 and 5 are fitted to the stator core 3, contact of the heads 3cb or the caulking portions 3cd of the rivets 3c attached to the stator core 3 with the brackets 4 and 5 can be avoided.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  This second embodiment differs from the first embodiment only in the configuration in which the dowel pin 31 is inserted into the stator core 3 of the SR motor 1, and the other configurations are the same. Therefore, only the configuration related to the dowel pin 31 will be described, and the description of the other configuration will be omitted.

  Specifically, the dowel pin 31 is a fixing member as a so-called through-hole knock pin (DOWEL PIN), and includes a shaft portion 31a formed in a substantially cylindrical shape. The shaft portion 31 a has a length dimension larger than the thickness dimension of the stator core 3. The shaft portion 31a is formed to have an inner diameter that is slightly larger than the outer diameter of the shaft portion 6a of the set bolt 6. By inserting the shaft portion 6a of the set bolt 6, the assembly can be facilitated. Yes.

  Further, the dowel pin 31 is inserted and attached to insertion holes 3ad and 3be communicating with the core material 3a and the side core 3b in a state where a predetermined number of core materials 3a are laminated between the pair of side cores 3b. The shaft portion 31a of the dowel pin 31 is inserted into the insertion holes 3ad and 3be of the core material 3a and the side core 3b that communicate with each other, so that the diameter of each of the core material 3a and the side core 3b depends on the outer diameter of the shaft portion 31a. The direction position and the circumferential position are located.

  Therefore, the insertion holes 3ad and 3be of the core material 3a and the side core 3b are formed to have an inner diameter dimension substantially equal to the outer diameter dimension of the shaft portion 31a of the dowel pin 31. In addition, diameter-enlarged recesses 32 and 33 are provided at the opening edges of the brackets 4 and 5 on the side where the bolt fastening screw portion 4c and the bolt insertion portion 5c are fitted to the stator core 3, respectively. The diameter-enlarged recesses 32 and 33 are formed to have an inner diameter dimension substantially equal to the outer diameter dimension of the shaft portion 31a of the dowel pin 31, and are formed concentrically with the bolt fastening screw portion 4c and the bolt insertion portion 5c. . Therefore, the diameter-enlarged recesses 32 and 33 are formed from both end surfaces of the stator core 3 in the axial direction when the brackets 4 and 5 are fitted to the end portions of the stator core 3 through which the shaft portion 31a of the dowel pin 31 is inserted. The end of the protruding dowel pin 31 is fitted.

  Next, a method for assembling the SR motor 1 using the dowel pins 31 will be described.

First, the dowel pins 31 are inserted into the insertion holes 3ad and 3be of the stator core 3, respectively. At this time, the radial position and the circumferential position of each of the core material 3a and the side core 3b of the stator core 3 are located depending on the outer diameter of the shaft portion 31a of the dowel pin 31.
Next, the front bracket 4 and the rear bracket 5 are attached so as to sandwich the stator core 3. At this time, the end portions of the dowel pins 31 attached to the insertion holes 3ad and 3be of the stator core 3 are fitted into the enlarged diameter concave portions 32 and 33 of the brackets 4 and 5, respectively. As a result, the radial position and the circumferential position of each bracket 4, 5 with respect to the stator core 3 are located according to the outer diameter dimension of the dowel pin 31.

  In this state, the shaft portion 6 a of the set bolt 6 is inserted into each bolt insertion portion 5 c of the rear bracket 5, and the shaft portion 6 a of the set bolt 6 is inserted into the shaft portion 31 a of the dowel pin 31. Then, the heads 6b of these set bolts 6 are screwed and fixed to the bolt fastening screw portions 4c of the front bracket 4. As a result, the radial position and circumferential position of the core material 3a and side core 3b of the stator core 3 and the radial position and circumferential position of the brackets 4 and 5 relative to the stator core 3 are fixed. Is done.

  Therefore, according to the second embodiment, after the dowel pin 31 is inserted into the insertion holes 3ad and 3be through which the stator core 3 communicates, the end portion of the dowel pin 31 is connected to the diameter-enlarged recesses 32 and the brackets 4 and 5, respectively. 33 is fitted. As a result, each of the radial position and the circumferential position of each bracket 4, 5 is positioned together with each core material 3 a and side core 3 b of the stator core 3.

  Therefore, a configuration (inlay fitting) in which the fitting step portions 4b and 5b of the brackets 4 and 5 and the peripheral step portion 3bc of the stator core 3 are fitted and positioned can be eliminated. Further, since the stator core 3 can be fastened and the brackets 4 and 5 can be aligned with the set bolt 6, the assembly process of the SR motor 1 can be further reduced, and the cost can be reduced.

  Next, based on FIG.19 and FIG.20, the 3rd Embodiment of this invention is described.

  The third embodiment is different from the first embodiment only in the configuration of the side core 3b and the brackets 4 and 5, and the other configurations are the same. Therefore, only the configuration of the side core 3b and the brackets 4 and 5 will be described, and the description of other configurations will be omitted.

  Specifically, the side core annular part 3ba of the side core 3b is formed to have an outermost diameter dimension equal to the outermost diameter dimension of the annular part 3aa of the core material 3a. And the notch 41 used as a step part is provided in the outer periphery of the side core annular part 3ba. A plurality of, for example, six of these notches 41 are provided at positions spaced at equal intervals in the circumferential direction of the outer peripheral edge of the side core annular portion 3ba. The notch 41 is formed by cutting out a part of the outer peripheral edge of the side core annular portion 3ba in the circumferential direction. Therefore, the notch 41 is formed in an outer diameter smaller than the outer diameter of the annular portion 3aa of the core material 3a. Furthermore, the notch 41 is formed behind the side core teeth 3bb and centered on a position in the radial direction from the center in the width direction of the side core teeth 3bb. Cutout portion 41 is formed in a size smaller than the width of each side core teeth portion 3bb.

  On the other hand, a fitting piece portion (not shown) which is a convex portion as a claw portion having a shape to be fitted to the notch portion 41 of the stator core 3 at the front end edge of the peripheral edge portions 4a and 5a of the front bracket 4 and the rear bracket 5. Is provided. These fitting pieces are formed by cutting out a part of the outer peripheral side of the front end edge of the peripheral edge portions 4a and 5a in a step shape, and each of these brackets 4 and 5 is formed at the end of the stator core 3 in the axial direction. When attached, the stator core 4 is configured to fit into the notch 41 and become an inlay.

  Therefore, according to the third embodiment, the stepped notch 41 is provided on the outer peripheral edge of the side core 3 b, and the fitting piece that fits into the notch 41 is formed on the front bracket 4 and the rear bracket 5. Provided. For this reason, by positioning the notches 41 in the fitting pieces, positioning when the brackets 4 and 5 are attached to the stator core 3 can be facilitated. In particular, the outer diameter of the side core 3b can be made equal to the outer diameter of the core material 3a, as compared with the first embodiment in which the outer diameter of the side core 3b is reduced and the peripheral step 3bc is provided.

  Furthermore, the notch part 41 of the side core 3b is provided in the base end side of the side core teeth part 3bb. For this reason, it is hard to give a magnetic influence to the magnetic circuit formed in the core material 3a and the side core 3b. Further, an increase in magnetic flux density when the outer diameter of the side core 3b is reduced to form the peripheral step 3bc can be minimized. Therefore, magnetic leakage of the stator core 3 due to the provision of the notches 41 can be reduced.

  In each of the above embodiments, the side core 3b laminated on both ends of a predetermined number of core members 3a of the stator core 3 is made of a magnetic material. However, when it is not necessary to use these side cores 3b as the magnetic circuit of the stator core 3, these side cores 3b can be made of a nonmagnetic material.

Further, the number of rivets 3c for fixing the stator core 3 is set to the number corresponding to the number of the teeth portions 3ab, that is, six. However, the configuration in which the core material 3a and the side core 3b of the stator core 3 are prevented from rotating in the circumferential direction and fixed is sufficient if there are at least three or more rivets 3c. In each of the above embodiments, the teeth 3ab The stator core 3 in the case of six was used. Therefore, a total of six insertion holes 3ac, 3be and communication holes 3ad, 3bf are provided. However, the numbers of the insertion holes 3ac and 3be and the communication holes 3ad and 3bf may be adjusted according to the number of the tooth portions 3ab of the stator core 3.

DESCRIPTION OF SYMBOLS 1 SR motor 1a Case 2 Shaft 3 Stator core 3a Core material 3aa Annular part 3ab Teeth part 3ac Insertion hole (insertion part)
3ad connecting hole 3b side core 3ba side core annular portion 3bb side core teeth portion 3bc peripheral step (step)
3bd side edge step part 3be insertion hole (insertion part)
3bf connecting hole 3c rivet (fixing member)
3ca Shaft portion 3cb Head portion 3cc Tip portion 3cd Caulking portion 3d Salient pole 4 Front bracket 4a Peripheral portion 4b Fitting step portion 4c Bolt fastening screw portion 4d Step portion 4e Through hole 4f First ball bearing 5 Rear bracket 5a Peripheral portion 5b Fitting step portion 5c Bolt insertion portion 5d Step portion 5e Bearing hole 5f Second ball bearing 5g End surface portion 6 Set bolt 6a Shaft portion 6b Head portion 7 Terminal bolt 8 Coil bobbin 8a Opening portion 9 Coil 11 Rotor core 11a Salient pole 21 Assembly jig 22 Lower jig 22a Flat plate part 22aa Mounting surface 22b Positioning cylinder part (radial direction positioning part)
22ba Upper end 22bb Screw holes 22c, 22d Positioning pins (circumferential positioning parts)
22ca, 22da upper end portion 22e standing recess 23 upper jig 23a flat plate portion 23aa fitting surface 23b fitting recess 23c through hole 23d positioning recess 23e caulking hole 24 punch 24a tip portion 25 fixing screw 25a shaft portion 25b head portion 25c fixing portion 25d Screw part 31 Dowel pin (fixing member)
31a Shaft part 32, 33 Diameter expansion recessed part 41 Notch part (step part)

Claims (12)

A stator core manufacturing method in which a plurality of plate members made of a magnetic material having an annular portion and a plurality of teeth portions extending at an interval on the inner peripheral side of the annular portion are laminated in the axial direction Because
In a positioning jig having a radial positioning portion for positioning the radial position of the annular portion of the plate material, and a circumferential positioning portion for positioning the circumferential position of the tooth portion of the plate material, A laminating step of laminating and positioning the plurality of plate members in the axial direction;
A fixing step of fixing between a plurality of plate members positioned by being stacked on the positioning jig;
A removal step of removing the plurality of fixed plate members from the positioning jig;
A stator core manufacturing method comprising: In the manufacturing method of the stator core according to claim 1,
In the laminating step, the plate material is fitted to the radial position portion of the positioning jig to position the radial position of the annular portion of the plate material, and the teeth portion of the plate material is positioned in the circumferential direction of the positioning jig. A stator core manufacturing method, characterized in that a circumferential position of a tooth portion of these plate members is located by fitting to a positioning portion. In the manufacturing method of the stator core according to claim 1 or 2,
The laminating step is performed by fitting the plate material to a cylindrical radial positioning portion having an outer diameter size substantially equal to the inner diameter size between the tooth portions of the plate material, and is provided on the outer periphery of the radial positioning portion. One of the teeth of the plate material between the pair of positioning members of the circumferential positioning portion having a pair of positioning members spaced apart at an interval equal to the width dimension of the teeth portion of the plate material and protruding in the axial direction. A method for manufacturing a stator core, wherein the parts are fitted together. In the manufacturing method of the stator core according to any one of claims 1 to 3,
Each plate has a connecting hole penetrating in the axial direction,
The stator core is characterized in that the plurality of plate members are fixed by pin-shaped fixing members that are inserted into the connection holes of the plurality of plate members that are stacked and positioned on the positioning jig. Manufacturing method. In the manufacturing method of the stator core according to claim 4,
When the plate member is laminated on the positioning jig, the fixing member is installed at a position where the fixing member is inserted into the connection hole of the plate member,
In the stacking step, the plurality of plate members are stacked on the positioning jig, and a fixing member is inserted into a connection hole of each plate member. A plurality of plate members made of a magnetic material having an annular portion and a plurality of teeth portions extending at intervals on the inner peripheral side of the annular portion are laminated in the axial direction. A stator core manufacturing method in which a side core having a step portion formed to have an outer diameter smaller than an outer diameter of the plate is laminated on an end of the plate in the axial direction,
A positioning jig having a radial positioning portion for positioning the radial position of the side core and the plate material, and a circumferential positioning portion for positioning the circumferential position of the tooth portion of the plate material, A first side core installation step of installing a side core;
A laminating step of laminating the plurality of plate members in the axial direction on the side cores;
A second side core installation step of installing a side core different from the side core on the plurality of laminated plate materials;
A fixing step of fixing between the side core and the plate material stacked on the positioning jig;
A removal step of removing the fixed side core and the plurality of plate members from the positioning jig,
A stator core manufacturing method comprising: In the manufacturing method of the stator core according to claim 6,
The side core has an annular side core annular portion having a stepped portion, and a side core teeth portion that is extended at an inner peripheral side of the side core annular portion and has an inner diameter equal to the tooth portion of the plate member. And
In the first and second side core installation steps, the side core teeth portion of the side core is fitted to the circumferential position portion of the positioning jig, and the circumferential position of the side core teeth portion is located. A stator core manufacturing method. A plurality of plate members made of a magnetic material having a plurality of teeth portions extending at an interval on the inner peripheral side of the annular portion and the annular portion;
An annular side core annular portion having a step portion formed to have an outer diameter dimension smaller than the outer diameter dimension of the plate material, and a tooth portion of the plate material that extends at an interval on the inner peripheral side of the side core annular portion. A side core having a side core teeth portion formed to have an equal inner diameter dimension,
The plurality of plate members, each tooth portion is laminated in the axial direction, and the annular portion is laminated and fixed concentrically in the axial direction,
The side core is attached to an end portion in the axial direction of the plurality of stacked plate members, the side core teeth portion is stacked on the tooth portion of the plate member, and the side core annular portion is concentric with the annular portion of the plate member. A stator core characterized in that it is laminated and fixed to. The stator core according to claim 8, wherein
The side core annular portion of the side core has a stepped portion extending in the circumferential direction and is formed to have an outer diameter smaller than the outer diameter of the annular portion of the plate material. The stator core according to claim 8, wherein
The stator core according to claim 1, wherein the side core annular portion of the side core is formed to have an outer diameter that is equal to the outer diameter of the plate member by providing a stepped portion with a cutout outer periphery. In the stator core according to any one of claims 8 to 10,
Each of the side core and the plate material is formed with a connecting hole that communicates when the side core and the plate material are stacked concentrically in the axial direction.
A stator core characterized in that a pin-shaped fixing member is inserted into a connecting hole that is communicated by laminating these side cores and plate members, and the side cores and plate members are fixed. The stator core according to claim 11, wherein
In each of the extending position of each tooth portion in the annular portion of the plate material and the extending position of each side core teeth portion in the side core annular portion of the side core, an insertion portion for fixing the bracket is provided,
The connection hole is provided at an extended position of each tooth portion in the annular portion of the plate member, and an extended position of each side core tooth portion in the side core annular portion of the side core, and is provided at a position separated from the insertion portion. A stator core characterized by that.

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