WO2000072426A1 - Core for rotating machine, method of manufacturing the same, piece for core, and rotating machine - Google Patents

Abstract

A core for a rotating machine in which the rate of use of an iron core material of a stator of the rotating machine, and most suitable materials are respectively used for a part where high magnetic density is required and a part where it is not required. A core (2) for a rotating machine has a core back part (22) and teeth parts (21). The core back part (22) and the teeth parts (21) are provided separately. The core back part (22) has teeth connecting parts (221) for connecting the teeth parts on the inner circumference side. The base ends (213) of the teeth parts (21) are fitted to the teeth connecting parts (221) to connect the teeth parts (21) to the core back part (22). The core back part (22) has a structure of a stack of rings in which pieces (220) are continuously connected in a ring shape.

Description

 Specification

Core for rotating machine, manufacturing method thereof,

 Core piece and rotating machine

Technical field

 The present invention relates to a rotating machine core, a method of manufacturing the same, a core back constituting the core, a piece constituting a core back, and a rotating machine using the rotating machine core. The present invention relates to a technology for realizing a rotating machine core having a high profile.

Background art

 Rotating machines such as induction motors, synchronous motors, DC motors, and other induction motors, induction generators, synchronous generators, DC generators, and other generators have a basic structure consisting of a stator (station) and a rotor (mouth). Evening) The stator has a core and a coil. The coils are mounted in slots provided in the core.

As a method for manufacturing the stator, for example, in the case of a small-sized motor, generally, an insulator overnight method is known. For example, as shown in Japanese Patent Application Laid-Open No. 9-1355555, a coil wound in a predetermined shape is set in a coil guide called a blade in advance, and this is set in a stream using hydraulic pressure or the like. A method is used in which a core is inserted into the core slot with a pushing jig called a hopper. The electrical insulation between the coil and the core, in addition to the wire coating, uses a method in which a slot insulating paper is placed in advance on the inner peripheral surface of the slot of the core and the coil is inserted into it. . In addition, the winding at that time is a winding method called distributed winding, which spans multiple core teeth. Take the form of winding.

 On the other hand, there is a winding method called concentrated winding. This is a method of winding one coil on one tooth. In this winding method, a series winding method in which a wire is wound directly from the inner periphery of the core, and a stator core is divided as shown in Japanese Patent Application Laid-Open No. 6-105487, The mainstream method is to apply a winding to each of the divided cores, weld the core pieces with the wound coils, and assemble them.

 However, the conventional technology has the following problems. Regarding the material utilization rate of the core, the material utilization rate is as low as 30 to 40% in both the Insa overnight method and the series winding method, since a round stay core is used from a square material. Also, even if the core is divided and stripping is taken into account, it is currently about 50 to 60%.

 Also, if the magnetic flux density of the core is to be increased, expensive materials will be used in large amounts, and the cost of the rotating machine will increase.

 A first object of the present invention is to provide a technique for increasing the utilization rate of a core material in a stator of a rotating machine.

 A second object of the present invention is to provide a technique that enables a portion requiring a high magnetic flux density and a portion not requiring a high magnetic flux density to be configured using optimal materials. Disclosure of the invention

In order to achieve the first object, according to a first aspect of the present invention, in a rotating machine core having a core back portion and a plurality of tooth portions, the core back portion, the plurality of tooth portions, The core back portion has a plurality of teeth connecting portions connecting the respective tooth portions on an inner peripheral side thereof, and the teeth portion has a base end connected to the tooth connecting portion. Attached A core for a rotating machine is provided, wherein the core is connected to the core back portion, and the core back portion has a structure in which a plurality of pieces are continuously arranged in a ring shape and a plurality of layers are stacked. You.

 According to a second aspect of the present invention, in a rotating machine core having a core back portion and a plurality of teeth portions, the core back portion and the plurality of teeth portions are provided separately, and the core back portion is provided. The part has a plurality of teeth connecting parts connecting the respective teeth parts on an inner peripheral side thereof, and the teeth part is connected to the core back part with its base end attached to the teeth connecting part. The core back portion has a structure in which a block in which a plurality of pieces are stacked is arranged in a row to form a ring, and a rotating machine core is provided. According to a third aspect of the present invention, in a core for a rotating machine, a core back portion, a plurality of teeth portions mounted on an inner peripheral side thereof, and a fastening member for fastening the core back portion from the outside are provided. The core back portion has a structure divided at a plurality of positions in a circumferential direction, and the tightening member tightens the core back portion from outside, and the divided portions of the core back portion are circumferentially divided. The present invention provides a rotating machine core characterized by being closely attached to a rotating machine.

 According to a fourth aspect of the present invention, in a rotating machine core having a core back portion and a plurality of teeth portions, the core back portion and the plurality of teeth portions are provided separately, and the core back portion is A plurality of teeth connecting portions for connecting the respective teeth portions on an inner peripheral side thereof, wherein the teeth portion has a base end attached to the tooth connecting portion and connected to the core back portion; The tip of each tooth is formed in an arc shape, and when attached to the core back portion, forms a circumference together with the tips of other adjacent teeth in order. Is done.

According to a fifth aspect of the present invention, in a rotating machine core having a core back portion and a plurality of teeth portions, the core back portion, the plurality of teeth portions, The core back portion has a plurality of teeth connecting portions for connecting the respective tooth portions on an inner peripheral side thereof, and the base portion of the tooth portion has a base end connected to the tooth connecting portion. It is attached and connected to the core back portion, and the tip of each tooth portion is formed in a straight line, and in the state of being attached to the core back portion, is sequentially polygonal with the tip of another adjacent tooth portion. Thus, there is provided a core for a rotating machine characterized by the following.

 According to the sixth aspect of the present invention, the core back used for the rotating machine core has a structure in which a plurality of pieces are continuously arranged in a ring and a plurality of pieces are stacked. A featured core back is provided.

 According to the seventh aspect of the present invention, the element for forming the core back that constitutes the rotating machine core has a curved form in which a plurality of sheets are connected to form a ring by stacking a plurality of layers. In addition, there is provided a core back piece having a connection portion for connecting teeth of a rotating machine on a side which is an inner periphery of the core back.

According to an eighth aspect of the present invention, in a method for manufacturing a rotating machine core having a core back portion and a tooth portion, a member constituting a core back portion having a tooth connecting portion to which the tooth portion is to be connected is provided. In addition to punching out from the belt-shaped member, the core backing portion is cut to a length corresponding to the size of the core to be manufactured, and the members constituting the core back portion are laminated to a desired thickness. The core back portion is formed by fixing both ends of the member, and has a connection portion with a tooth connection portion of a member constituting the core back portion, and a tip end of each tooth portion is connected. The member in the state is punched out of the band-shaped member, cut to a length corresponding to the size of the core to be manufactured, and a plurality of members constituting the teeth portion are laminated to a desired thickness, and simultaneously. Alternatively, in order (in any order), the teeth are bent in a ring shape with the tips of the teeth facing outward, and both ends of the member are fixed to form a teeth assembly. Molded coil Attach a body, insert the tooth assembly into the inner periphery of the core back portion, attach the connecting portion of the tooth member to the tooth connecting portion, and attach each tooth portion to the core back portion. The present invention provides a method of manufacturing a core for a rotating machine, characterized by being fixed to a core.

 According to a ninth aspect of the present invention, in the method for manufacturing a rotating machine core having a core back portion and a teeth portion, the core back portion is formed in a structure divided into a plurality of circumferential portions. A housing having an inner diameter smaller than the outer diameter of the core is expanded by applying a temperature difference, and the core back portion is fitted in the housing, and the housing cools and contracts. This provides a method for manufacturing a core for a rotating machine, wherein a stress is applied in a circumferential direction of the core. According to a tenth aspect of the present invention, in a method for manufacturing a rotating machine core having a core back portion and a teeth portion, the teeth portion and the core back portion are each formed by laminating plate materials, and A method for manufacturing a core for a rotating machine, characterized in that, after processing the portions to be joined to each other to be thinner than the original plate material, the teeth portion is joined to the core back portion.

 Further, according to the eleventh aspect of the present invention, there is provided a rotating mechanism having a stage formed by winding a coil formed in advance around a tooth portion of the core for a rotating machine described above. Machine is provided.

According to a twelfth aspect of the present invention, there is provided a rotating machine core having a core back portion and a plurality of tooth portions. A core for a rotating machine is provided, wherein the core back portion is formed of a silicon steel plate, and the core back portion is formed of a non-oriented silicon steel plate. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a partially cutaway perspective view showing a general structure of a motor to which the present invention is applied.

 FIG. 2 is a perspective view showing a general structure of a motor stay to which the present invention is applied.

 FIG. 3 is a perspective view showing an example of a coil formed body used in the rotating machine of the present invention.

 FIG. 4 is a plan view showing an example of the core according to the present invention.

 FIG. 5 is an explanatory diagram showing a mounting position of a coil molded body on a core according to the present invention.

 FIG. 6 is a partial cross-sectional view showing a mounted state of a coil formed body on a tooth portion used in the present invention.

 FIG. 7 is an explanatory diagram showing a forming state of a coil formed body used in the rotating machine of the present invention.

 FIG. 8 is an explanatory view showing a state before molding in a coil molded body having another shape.

 FIG. 9 is an explanatory diagram showing a cross-sectional forming dimension relationship after forming in a coil formed body used in the rotating machine of the present invention.

 FIG. 10 is a table showing a relationship between an excess load, a forming dimension, and a pinhole when forming a coil formed body used in the rotating machine of the present invention.

 FIG. 11 is a graph showing a relationship between a load and a forming dimension when forming a coil formed body used in the rotating machine of the present invention.

 FIG. 12 is an explanatory diagram showing a change in cross-sectional area before and after forming of a coil winding used in the rotating machine of the present invention.

Fig. 13 (a) is an explanatory view showing a state where a general coil winding is attached to the teeth, Fig. 13 (b) is a cross-sectional view taken along line A-A, and Fig. 13 (c) is B — B sectional view, Fig. 13 (d) is an explanatory view showing the winding state after coil forming, Fig. 13 (e) shows the A-A cross-sectional view.

 Fig. 14 (a) is a plan view showing a state where the members constituting the teeth assembly are punched out of the band-shaped member, and Fig. 14 (b) is a diagram showing a state where the members constituting the core back portion are punched out of the band-shaped member. It is a top view showing a state.

 FIG. 15 (a) is a perspective view showing a state in which the coil is formed by the coil forming body and the core of the present invention, and FIG. 15 (b) is a state in which the coil is mounted on the teeth assembly. FIG. 15 (c) is an explanatory view showing a state where a coil is mounted on the teeth assembly.

 FIG. 16 (a) is a partial plan view showing another first embodiment of the connection relationship between the core back portion and the tooth portion, and FIG. 16 (b) is a partial plan view showing the core back portion and the tooth portion. FIG. 16 (c) is a partial plan view showing another third form of the connection relationship between the core back portion and the teeth portion, and FIG. FIG. 6 (d) is a partial plan view showing another fourth embodiment of the connection relationship between the core back portion and the teeth portion, and FIG. 16 (e) is another partial connection diagram showing the connection relationship between the core back portion and the teeth portion. FIG. 16 (f) is a partial plan view showing a fifth embodiment of the present invention, and FIG. 16 (g) is a partial plan view showing another sixth embodiment of the connection relationship between the core back portion and the teeth portion. FIG. 21 is a partial plan view showing another seventh embodiment of the connection relationship between the core back portion and the teeth portion.

 FIG. 17 (a) is a plan view of a core having adjacent teeth separated from each other, and FIG. 17 (b) is a perspective view showing the stacked teeth.

 FIG. 18 (a) is a plan view showing an example of a piece constituting the core back portion, FIG. 18 (b) is a plan view showing a state where the piece is bent, and FIG. 18 (c). Fig. 18 (d) is a perspective view showing a state in which the core back portion is formed by laminating pieces, and Fig. 18 (d) is a plan view showing a shape in which the core back portion and the teeth portion are assembled.

FIG. 19 (a) is an explanatory view showing a state where the housing is shrink-fitted to the core, Fig. 19 (b) is an explanatory diagram showing the state after the eight housings have been fitted and contracted.

 FIG. 20 is an explanatory view showing a state where a band-shaped member such as a steel band is fastened to the core to assemble the core.

 FIG. 21 (a) is a plan view showing a state in which a divided end and a notch on the outer periphery of the core are fixed by welding, and FIG. 21 (b) is a perspective view thereof.

 FIG. 22 (a) is an explanatory view showing a step of resin-molding the core, and FIG. 22 (b) is a perspective view showing the resin-molded core.

 FIGS. 23 (a) to (f) are explanatory diagrams showing various modifications of the element constituting the core back portion, respectively. FIG. 23 (g) shows a state in which the element is punched from a strip-shaped plate material. FIG.

 Fig. 24 (a) is an explanatory diagram showing the state in which the pieces are stacked with a shift of one slot pitch for each layer, and Fig. 24 (b) is a block in which a plurality of pieces are stacked for each layer. FIG. 4 is an explanatory view showing a state in which layers are shifted by one slot pitch. FIG. 25 (a) is a plan view showing an example where the assembled shape of the core back portion and the tooth portion has a ^ shape in which the tips of the tooth portions are abutted, and FIG. 25 (b) is a core back portion. FIG. 25 (c) is a plan view showing a second form in which the shape ^ assembled with the tooth part is a shape in which the tip of the tooth part is abutted. FIG. 25 (c) shows the core back part shown in FIG. 23 (a). FIG. 5 is a plan view showing an example in which the teeth are assembled into a shape in which the tips of the teeth are butted.

 FIG. 26 (a) is a plan view showing a joint shape between the core back portion and the teeth portion, and FIG. 26 (b) is a plan view showing a second form of the joint shape between the core back portion and the teeth portion. FIG. 26 (c) is a plan view showing a third form of the joint shape between the core back portion and the teeth portion.

FIG. 27 (a) is an explanatory view illustrating a state in which the teeth are punched out of the strip, and FIG. 27 (b) is a perspective view showing the teeth in a stacked state. FIG. 28 (a) is an explanatory view showing an embodiment in which the pieces are shifted by one slot pitch, FIG. 28 (b) is a sectional view thereof, and FIG. 28 (c) is a piece FIG. 28 (d) is an explanatory view showing another mode in which the state is shifted by one slot pitch.

 FIG. 29 (a) is a plan view showing a state where the base end portion of the teeth portion is thinned, and FIG. 29 (b) is a cross-sectional view showing a state where the teeth are stacked.

 FIG. 30 (a) is a perspective view showing that the teeth are assembled by adjusting the thickness by a finish press before fitting and assembling to the core back, and FIG. 30 (b) is the core back. FIG. 6 is a perspective view showing that the stacking is performed by adjusting the stack thickness by a finishing press before fitting and assembling the teeth. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, a core applied to a motor such as an induction motor or a synchronous motor will be described as an example. However, the present invention is not limited to this. It is applicable to various types of rotating machines, including generators.

 As shown in FIG. 1, the induction motor and the synchronous motor have a stator (steering station) 3 and a rotor (rotor) 6 as a basic structure. The stator 3 has a core 2 and a coil 1. In the present invention, a molded coil molded body is used as the coil 1.

As shown in FIG. 2, the core 2 is composed of a core back portion 22 and a tooth portion 21 protruding inward from the core back portion 22. Inside the core 2, the space between the tooth portions 21 becomes a slot 23. The coil molded body 1 is mounted on the teeth 21, and the coil 1 is inserted into the slot 23. In the present invention, a new device has been devised with respect to the core 2 and its manufacturing method. In addition, in connection with the present invention, in addition to this, New methods have been devised for the assembling method and the like.

 As shown in FIG. 3, the coil formed body 1 is formed in a state where the wire is wound in an annular shape while holding the through hole la. The through hole la is formed in a cross-sectional shape that can be fitted to the tooth portion 21. . The inner part of the coil molded body 1 forming the through hole 1a preferably has a shape in which the sides are parallel. This is because both sides of the coil mounting portion of the teeth 21 are formed in parallel. Therefore, when the shape of the tooth portion is different, the cross-sectional shape of the through-hole 1a is changed accordingly. The coil molded body 1 has a lead wire 12 for making an electrical connection.

 Further, the coil molded body 1 has a shape in which a side surface of a portion accommodated in the slot 23 spreads in a fan shape from one end side to the other end side of the through hole 1a. In this case, the shape spreading in a fan shape is sandwiched between two adjacent radii of the core 2 passing through the center of each slot 23 when the coil forming body 1 is accommodated in the slot 23. What is necessary is just to be a shape which can be accommodated in the area to be covered. Preferably, the fan-shaped expansion coincides with the expansion of this region. By doing so, it is possible to accommodate more windings. Also, spatial interference between adjacent coil compacts 1 can be avoided. As a result, when assembling the stay, it is possible to avoid the contact of the coil molded body 1 and to prevent the occurrence of damage, insulation failure, etc. due to contact, friction, etc. between adjacent coils during assembly. it can.

The wire constituting the coil formed body 1 is composed of a metal wire and an insulating film for insulating the surface of the metal wire. As the metal wire, for example, copper is generally used. As the insulating film, for example, polyesterimide is used. In the present embodiment, PEW (polyester imide wire) is used. Also, in the present embodiment, as shown in FIGS. 1 and 6, the end of one end side (the narrow side of the sector) of the coil molded body 1 is located at the tooth tip end 2 11 1 side. 1 c, and the other end (the wide side of the fan) The end face Id is located on the side of the lock portion 22. Here, the end surface 1a located on the tip end 2 11 1 side of the tooth portion has a shape that is receded and inclined toward the inner peripheral side. This is in accordance with the fact that the rear surface of the tip 2 1 1 of the tooth portion 2 1 1 is inclined. Of course, this end face la does not necessarily have to be inclined.

 Next, a first embodiment of the core according to the present invention will be described with reference to FIG. 4, FIG. 5, FIG. 6, FIG. 14 (a) and FIG. 14 (b). Fig. 4 shows an example of a core without a coil. FIG. 5 shows an example of a core in a state where the coil molded body is mounted. FIG. 14 (a) shows an example of members constituting the teeth assembly, and FIG. 14 (b) shows members constituting the core back portion.

 As shown in FIG. 4, the core 2 is composed of a coil back part 22 and a toothed solid body 21a. The teeth assembly 21a is composed of 12 teeth portions 21 connected at the tips. As is clear from FIG. 4, the core knocking part 22 and the tooth assembly 21a are both formed in a ring shape. However, as shown in Fig. 14 (a) and Fig. 14 (b), a band-shaped plate material is used for each component. That is, the members (plates) shown in FIGS. 14 (a) and 14 (b) are laminated to a desired thickness, and are bent into a ring shape.

As the material of the core 2, a silicon steel plate is usually used, but from the viewpoint of realizing a high magnetic flux density, a material having as large a saturation magnetization as possible is preferable. An example of such a material is a material having anisotropy such that the saturation magnetization is large in a specific direction of the material. One example is a grain-oriented silicon steel sheet. Therefore, when a grain-oriented silicon steel sheet is used in accordance with the direction of the magnetic flux according to the direction of the large saturation magnetization, favorable results can be expected. In addition, this grain-oriented silicon steel sheet is characterized by being difficult to process and being expensive. Therefore, a grain-oriented silicon steel sheet is used as the material for core 2. In doing so, it is necessary to consider these points as well.

 In the present invention, since the core back portion 22 and the plurality of teeth portions 21 are separately formed, it is possible to use a material suitable for each. That is, since the magnetic flux density needs to be increased in the teeth 21 where the magnetic flux is directed in the radial direction, a material having a large saturation magnetization is used for the teeth 21 and the core back 22 where the magnetic flux is divided in the circumferential direction is used. Since it is not required to increase the magnetic flux density, the material of the core back portion 22 can be distinguished, for example, by using a relatively small material. Therefore, in the present embodiment, the teeth portion 21 requiring a large magnetic flux density is made of a material having a large saturation magnetization, for example, a grain oriented silicon steel sheet, and the core back portion 22 not requiring a large magnetic flux density. Use other materials, for example, non-oriented silicon steel sheet, pure iron, soft iron, etc., which are relatively inexpensive and easy to process. This can be applied to other embodiments described later.

 As shown in FIG. 14 (b), the core back portion 22 is formed in a belt-like shape in which 12 unit members 22a corresponding to the number of the teeth portions 21 are connected. This can be manufactured from a band-shaped member (hoop) not shown, for example, by punching. The unit member 22 a has a tooth connecting portion 22 1 connecting to the connecting portion 21 3 of the tooth portion 21 on the side facing the inner peripheral side, and a member when the member is bent in a ring shape. Notches 2 2 2 are provided to absorb contraction on the inner peripheral side of the member, and cutouts 2 2 3 are provided on the side facing the outer peripheral side to absorb the elongation of the member on the outer peripheral side when the member is bent into a ring shape. ing. These are all provided in a cut state. The members constituting the core back portion are fixed in a state where they are bent into a ring shape and both ends are in contact with each other. The fixing can be performed by, for example, welding, caulking, or the like. In the case of caulking, for example, a silicon steel plate is plastically deformed and connected.

As shown in FIG. 14 (b), the core back part 22 has a unit part. Each of the members 22a is provided with a caulking portion 229 for caulking with another unit member 22a vertically adjacent to each other when they are laminated. Although not shown, the swaged portion 229 is partially cut into a member, for example, a convex shape projecting to the lower surface side by half blanking, and the upper surface side of the member is a concave shape. It is processed to become. Then, at the time of lamination, it is caulked in a state where the convex portion is fitted into the concave portion of another unit member. Note that the relationship between the concavities and convexities in the caulked portion 229 may be upside down.

 The teeth connecting portion 221 has a shape that does not come off by being fitted to a connecting portion 213 on the side of the teeth 21 described later. For this reason, in the present embodiment, the teeth 21 have a connecting portion 213 on the side thereof, and the teeth connecting portion 221 has a shape having a groove.

 The tooth assembly 21a is formed by laminating a plurality of members 210 forming a tooth portion. As shown in FIG. 14 (a), the members 210 constituting the teeth portion are alternately arranged in such a manner that the portions to be the teeth portions 21 face each other alternately. It is manufactured by punching from a hoop. In this case as well, the teeth 21 are made into a unit, and they are manufactured in a connected state. Then, it is formed to have a length that becomes a necessary number of teeth portions 21. Such a shape is suitable for mass-producing the teeth 21. Further, as shown in FIG. 14 (a), since two sets of members 210 are taken from the belt-shaped member, the use efficiency of the material can be greatly improved.

 The tooth assembly 2 1a is formed by the lateral end 2 1 1a of the tip 2 1 1 of each tooth 2 1 and the lateral end 2 1 la of the tip 2 1 1 of the adjacent tooth 2 1. It is articulated. With such an articulated structure, the teeth 21 can be treated integrally. For this reason, handling is convenient during manufacturing and assembly. In addition, there is an advantage that the strength is increased structurally.

Each tooth 21 has a substantially T-shape, and the back surface of the protruding portion on the tip side is oblique. Cut for As described above, the connecting portion 21 for connecting to the core back portion 22 is provided on the base end side of the tooth portion 21.

 In addition, as shown in FIG. 14 (a), each tooth portion 21 is provided with a caulking portion 219 for caulking with another tooth portion 21 vertically adjacent when stacked. ing. Although not shown, the swaged portion 219 is formed by half-blanking to form a part of the member forming the tooth portion 21, for example, a convex shape projecting to the lower surface side. The upper surface side of the member is processed so as to have a concave shape. Then, at the time of lamination, it is caulked in a state where the convex portion is fitted into the concave portion of another unit member. Note that the relationship between the unevenness in the caulked portion 2 19 may be upside down.

 FIG. 17 (a) shows an example in which the tips 211 of the adjacent tooth portions 21 are separated from each other. In this example, the tooth portions 21 are formed by cutting the respective tooth portions 21 from the connected tooth assembly 21a. Of course, the present invention is not limited thereto. The cutting can be performed after attaching to the core back member 22 as shown in FIG. 17 (a). Further, as shown in FIG. 17 (b), the teeth 21 may be punched out one by one from the time of punching and laminated.

Further, the core 2 of the present invention is different from the conventional one-piece core in the method of assembling the windings. For this reason, in the core 2 of the present invention, there is no need to provide a gap for inserting a winding. For this reason, even when the teeth 21 are punched out one by one, for example, as shown in FIG. 25 (a), the adjacent teeth 21 are inserted into the core back 22. In this state, it is possible to adopt a structure in which the adjacent lateral end portions 211a are in contact with each other. In this way, by bringing the adjacent lateral end portions 211a of the teeth portions 21 into contact with each other and abutting each other, it is possible to secure accuracy on the inner circumferential side of the stay. The structure of assembling the tooth portions 21 by abutting the lateral ends 2 11 a of the teeth 21 does not depend on the shape of the core back portion. As shown in FIG. 14 (b), a core member 22 shown in FIG. 4 is formed by processing a plurality of unit members 22a into a ring shape and laminating a plate material. Can also be applied. Also, as shown in FIG. 18 (a) and FIG. 23, a plurality of pieces 220 are arranged in a ring in a row, and a plurality of layers are stacked, as shown in FIG. 18 (c). Such a structure can also be applied.

 Further, as shown in FIG. 25 (b), it is also possible to form the tooth tip 211 linearly without making the inner circumferential side of the stay an arc. This shape contributes to reducing the cogging torque of the motor.

 Thus, the present invention has a structure in which the core back portion 22 and the teeth portion 21 are divided and independently formed. Each member is formed by laminating members manufactured by punching from a band-shaped plate material. Therefore, it is easy to take out the material, and the utilization efficiency of the material can be increased.

 In particular, in the present embodiment, since the teeth 21 have a structure in which the members 210 constituting the two sets of teeth are alternately arranged, it is possible to further increase the material use efficiency. Become. In the present embodiment, as can be seen from FIG. 14 (a), regarding the tooth portion 21, the useless portion is mainly a cutting margin 21c for separating the two sets. Therefore, by cutting in the cutting allowance 21c as much as possible, it is possible to achieve a material utilization rate of, for example, about 81%. Further, in the case of the core back portion 22, since the shape has little waste, for example, the material utilization rate can be 85%. Therefore, according to the present embodiment, both the teeth portion and the core back portion can have a material utilization of 80% or more. For this reason, the material utilization rate can be significantly improved as compared with the conventional structure.

In addition, the teeth portion 21 and the core back portion 22 should be formed separately. As a result, the teeth 21 having a high magnetic flux density can be made of a material having a high saturation magnetization, while the core back 22 having a relatively low magnetic flux density has a high saturation magnetization. Since it may be smaller than the tooth part 21, it is easy to process and a cheap material can be used. Next, the above-described coil formed body will be described with reference to FIGS. 7 to 13. FIG.

7 to 9 show a molding die and a molding process using the molding die. FIG. 10 and FIG. 11 show the molding conditions. FIGS. 12 and 13 show the compression state of the winding.

 FIG. 7 shows a coil forming die used for forming a coil formed body. FIG. 7 shows a state after the coil has already been compression-molded. The mold shown in FIG. 7 has a pobin 15a for winding a wire constituting a coil, and a pressing mold 15b for pressing a group of wires 11 wound on the pobin 15a. , 15c and 15d. For the molding, a pressure device (not shown) and a control device for controlling the pressure are used. As the pressure source, for example, hydraulic pressure or pneumatic pressure is used.

 The pressing mold 15 b presses a side surface of the group of the coil windings 11, that is, a portion to be the side surface 1 b of the coil molded body 1. The pressing dies 15 c and 15 d press the end faces of the group of the coil windings 11, that is, the portions that become the end faces 1 c of the coil molded body 1. In this case, the pressing die 15c presses in a direction orthogonal to the pressing die 15b. For this reason, the lower end surface of the pressing die 15 d and the upper end surface of the pressing die 15 c are obliquely brought into contact with each other, and the slope 15 e is orthogonal to the pressing force of the pressing die 15 d. The component force in the direction is taken out, and the pressing mold 15c is configured to be pressed laterally. By doing so, there is an advantage that the pressing force can be performed from the same direction by a common pressure source.

Here, the forming conditions of the coil formed body will be described. For the sake of simplicity, it is assumed that the coil molded body 1 does not have an inclined end face 1c. You.

 As shown in FIG. 8, the wire 11 is wound around the pobin 15a, and is pressed by the above-described pressing dies 15b, 15c, and 15d. As a result, as shown in FIG. 9, the gap between the wires 11 is crushed, and at the same time, the wires 11 themselves are deformed and, in some cases, compressed, to form the coil formed body 1. As shown in FIG. 9, after molding, the entire shape is maintained by the deformation of the wire 11. At the time of molding, the insulating film (not shown) covering each wire also deforms with the deformation of the wire itself. However, as shown in FIG. 10 described later, according to the experiment of the present inventors, the insulating coating of the wire was not broken by the molding.

 Note that the shape of the mold is appropriately selected according to the shape of the coil molded body. For example, the mold shown in FIG. 7 is used for molding a structure in which the end surface on one end side of the coil molded body 1 has an inclined surface as described above. On the other hand, the mold shown in FIGS. 8 and 9 is used in a case where the end surface of one end of the coil molded body 1 does not have an inclined surface.

 Next, the outline of the shape change of the coil formed body will be described with reference to FIGS. 10, 11 and 12. As shown in FIG. 12, the coil cross-sectional dimension when the wire 11 is wound is clearly different from the cross-sectional dimension of the coil formed body 1 after forming. That is, assuming that the diameter of the wire 11 is d, the dimension D 1 in the lateral direction of the drawing is {+ ^ 30 2 (the number of steps—1)}. The vertical dimension L1 is (dX number). The coil cross-sectional area is (D 1 XL 1). Therefore, the cross-sectional dimension in the winding state cannot be geometrically smaller than this cross-sectional area.

In the present invention, the coil cross-sectional area is made smaller than that in the winding state by adding molding to the slot insertion portion of the coil after winding. If the cross-sectional area of the wire itself is equivalent, by adding forming, the coil cross-sectional area after forming (D 2 XL 2) will be smaller than the coil cross-sectional area after winding (D 1 XL 1). Is also smaller. If the cross-sectional area of the wire itself is reduced by compression, the cross-sectional area (D 2 XL 2) of the entire coil cross section will be about 80% of the original value due to the compression forming up to the compression limit. Thus, the present invention changes the cross-sectional area of the coil by adding a forming step from the state of the winding.

 That is, in the coil molded body 1 of the present invention, assuming that the diameter of the wire is d, the number of windings arranged in the radial direction of the core is m, and the number of windings arranged in the tangential direction of the core is n, the wires are neatly arranged in the slot. The cross-sectional area S 0 at a certain cross section in the wound state

 S 0 = {d + ^ 3 dZ2 x (n-1)} X (d Xm)

The molding is performed so that the cross-sectional area of the portion accommodated in the slot in the cross section at the same portion satisfies (Sp <S 0).

Here, the relationship between the cross-sectional dimension D2 and the load during molding is shown in FIG. FIG. 11 shows a graph of this relationship. In these relations, the load is represented by a load applied per 480 mm ² . The figure also shows the case where a wire rod with a wire diameter of 1.2 mm is used. As shown in FIGS. 10 and 11, when the pressing force during molding is increased, the cross-sectional dimension is reduced. However, when the load is more than a certain level, for example, 6 ton or more, there is no significant change.

 The number of pinholes shown in FIG. 10 means the number of locations where the insulating film of the wire is broken. Normally, this is a test method that checks how much electricity leaks when the wires are immersed in the electrolyte. Inspection results are represented by numbers. In the present embodiment, in the range shown in FIG. 10, the number of pinholes is 0 even if the load increases. Therefore, this shows that the molding did not damage the insulating film.

The effect of forming a coil as in the present invention will be described with reference to FIG. Fig. 13 (a) to Fig. 13 (e) show the state of the winding around the teeth. In general, when winding into a polygonal shape having corners such as a mold, a pobin, and a tooth portion, as shown in FIG. The bobbin and the teeth 21 are in close contact with the winding base material (see Fig. 13 (b)), and are wound with the most clearance from the winding base material at the center of the side. As shown in the BB section of FIG. 13 (c), it can be seen that there is a considerable gap with the base material at the center of the side. If the coil is assembled as a motor stay in this state, the space will decrease due to this gap, and the motor performance will decrease. Therefore, as described above, by applying a forming force to the side portion of the coil in the wound state after winding, as shown in FIGS. 13 (d) and 13 (e), the coil Also in the side part, a coil having a shape in which the wire is in close contact with the base material is used. This makes it possible to assemble the motor stator with a high space factor.

Even with the structure shown in Fig. 13 (e), the space factor can be improved as compared with the case without molding. In addition to simply compressing the sides of the coil, the cross-sectional shape of the slot insertion portion matches the shape shown in Fig. 6, that is, the internal shape of the 1Z2 portion of the slot 23. It can be formed as follows. This is preferable because the space factor can be further improved. When assembling the coil, insert the coil 1 from the outer peripheral side of the teeth 21. At that time, it is necessary to shape the coil so that it can be inserted into adjacent coils without interference. This makes it possible for the coil to fully enter the slot's cross-sectional area, and achieves a high space factor. The cross-sectional shape of the coil shape in the slot is similar to the cross-sectional shape of the slot. This is also an advantage of splitting the core. When winding the teeth with an insulator such as a pobin, the cross section of the wire is not formed, and even in the case of a low space factor coil, the coil cross section is similar to the slot shape, so there is a margin. One winding This has the effect of improving the life of insulation deterioration.

 Next, the assembly of the stay of the rotating machine will be described with reference to FIG. 3, FIG. 5, FIG. 6, FIG. 7, FIG. The assembly is not limited to the method described below. However, according to the following method, there is an advantage that the handling of each member is easy, so that automation is easy.

 First, the coil wound on the pobin 15a is pressed using the pressing dies 15a, 15b and 15c as shown in Fig. 7, and the coil winding is compression molded. I do. Thus, a coil molded body 1 as shown in FIG. 3 is obtained. On the other hand, apart from the above, as shown in FIGS. 14 (a) and 14 (b), the belt-shaped member is used to form the tooth assembly 21a and the core back portion 22. Are formed by punching or the like. The production of these members is not limited to punching. It may be performed by another method. Thereafter, the necessary number of members 210 constituting the teeth portion and the member constituting the core back portion 22 are laminated. At the time of lamination, after each member is laminated, caulking is performed by applying pressure in the lamination direction. As a result, the caulked portion 219 and the caulked portion 229 are firmly joined. Thereafter, the core back portion 22 is bent. That is, they are bent so as to form a ring shape. After bending, both ends are fixed by, for example, welding, caulking, or the like. Thus, the core back 22 and the teeth assembly 21a are manufactured.

 Next, as shown in FIGS. 15 (a) and 15 (b), the coil formed body 1 is fitted into each tooth portion 21 of the tooth assembly 21a. That is, the through hole 1 a of the coil forming body 1 and the teeth 21 are fitted. At this time, each coil molded body 1 is fitted to the teeth 21 with the end face 1a facing the inner peripheral side. This state is shown in Fig. 15 (c).

Next, as shown in FIG. 15 (a), the tooth assembly 21a on which the coil molded body 1 is mounted is fitted to the inner periphery of the core back portion 22. this At this time, circumferential alignment is performed so that the teeth connecting portion 2 21 of the core back portion 22 and the connecting portion 2 13 of the teeth portion 21 are fitted. When assembled in this way, the steps shown in FIG. 5 are obtained together with the formation of the core.

 As described above, in the present embodiment, the coil molded body 1 is pushed into the tooth assembly 21 a so that each tooth portion 21 is inserted into the through hole 1 a of the coil molded body 1. The mounting of the coil on the core is very easy because it can be mounted. In addition, since the coil molded body 1 maintains a certain shape, no special jig is required for mounting so that the coil is not disturbed. In addition, since the coil can be mounted with high density on the coil molded body 1 itself, the space factor in the slot 23 can be increased.

 During the stay with the above-mentioned structure, the material utilization rate can be increased while maintaining a high space factor. With reference to FIG. 16, a description will be given of a structure capable of further improving the performance of such a structure.

 The examples shown in Fig. 16 (a) to (g) show various forms related to the connection between the core back and the teeth. These embodiments are examples in which a gap that may occur between the connecting portion 2 13 of the tooth portion 21 and the connecting portion 2 21 of the core back portion 22 is eliminated.

Fig. 16 (a) shows the bending center of the core of the core back part 22 placed on the extension of the teeth part 21. After the coil molded body and the core 2 are assembled, the final When assembling the housing 4 as shown in FIG. 19 to the outer peripheral portion of the core back portion 22, the bent portion is further compressed by press-fitting the core 2 into the housing 4. Tighten the joint between the teeth 21 and the teeth 21. Therefore, the cuts 224 are provided in the core back member 22 in advance. The form of the cuts 2 2 4 is variously possible. Figure 16 (a) shows an example of a deep V-shaped cut. The cuts 224 are provided on the inner peripheral side of the core back portion 22 so that the circumferential length of the connecting portion 221 of the core back portion 22 can be increased or decreased. As a result, the connecting portion 2 13 of the tooth portion 21 can be easily fitted into the connecting portion 2 21 of the core back portion 22, and the circumferential length of the connecting portion 2 13 can be reduced. By applying such a force, the connecting portion 21 of the tooth portion 21 can be securely and firmly connected to the connecting portion 21 of the core back portion 22. The notches 224 also function as weak portions against the stress applied during assembly. This facilitates bending of the core back portion 22.

 Fig. 16 (b) shows the connecting part 2 13 of the tooth part 21 with the core pack part 22 and the connecting part 21 of the core back part 22 with the tooth part 21. Each is an example of a V-shaped tapered shape. In this example, when assembling the housing to the outer peripheral part of the core part 22, the connecting part 21 13 is pressed by the slope of the connecting part 22 1. At this time, as described above, the tooth portion 21 is not displaced toward the inner peripheral side because the lateral end portions of the teeth 21 abut on other lateral end portions adjacent to each other at the distal end side. In state. Therefore, the tooth portion 21 is firmly held in the core back 22 by the force acting in the circumferential direction at its own tip and the force acting on the connecting portion 21. As described above, this connection form has a structure in which the connection portion is further compressed by press-fitting and shrink-fitting the housing and the core, and the connection portion 2 13 between the core back portion 22 and the teeth portion 21 is tightened. Take.

In FIG. 16 (c), as shown in the figure, the connecting portion 22 1 of the core back portion 22 is formed into a shape that is cut long in the circumferential direction. Thus, when the connecting portion (not shown) of the tooth portion 21 is assembled by utilizing the resiliency of the plate material constituting the core back portion 22, the tooth connecting portion 22 of the core back portion 22 is assembled. 1 is elastically deformed, so that the connecting part retains the fastening force even after it is connected to the teeth And

 FIG. 16 (d) shows a structure in which the core back portion 22 and the teeth portion 21 are connected via another member 24 connecting the core back portion 22 and the teeth portion 21. For this purpose, the core back portion 22 is provided with a notch 2 25 in the axial direction. On the other hand, a similar notch 2 14 is provided in the connecting portion 2 13 of the tooth portion 21. The member 24 has a planar shape penetrating into a hole-shaped space formed by the notches 2 25 and 2 14 that is generated when the teeth portion 21 is connected to the core back portion 22. The assembling can be performed by inserting the member 24 into a stack in which the teeth portion 21 is connected to the core back portion 22. With such a structure, the connection between the core back portion 22 and the teeth portion 21 can be strengthened.

 Fig. 16 (e) and Fig. 16 (f) both use the coupling method called the pole expansion method. That is, the hole 226 is provided in the core back portion 22 at a position sandwiching the connecting portion 213 of the tooth portion 21 or the hole 215 is provided in the connecting portion of the tooth portion 21. With each connected, pass a slightly larger pole and shaft through the holes to widen the holes. As a result, the core back portion 22 or the tooth portion 21 is plastically deformed to obtain a bonding force.

 FIG. 16 (g) shows the shape of the teeth 21 and the core back 22 as the dovetail structure as in the above-described embodiment. ) And a wedge 26, commonly known as a force razor, is driven into position.

By using the example as described above, the gap between the core back portion and the teeth portion can be reduced as much as possible. For this reason, vibration noise can be further suppressed. As a result, it is possible to obtain a stationary core with a reduced influence on the service life and characteristics. Next, a second embodiment of the core according to the present invention will be described with reference to FIG. 18 and FIG. The present embodiment relates to a rotating machine core including a core back portion and a plurality of teeth portions, and the core back portion and the plurality of teeth portions are provided separately.

 In the present embodiment, the core back portion 22 is formed by bending a piece 220 as shown in FIG. 18 (a) into a plurality of pieces as shown in FIG. 18 (b). They are arranged in a ring and have a structure in which they are stacked in multiple layers as shown in Fig. 18 (c). As shown in FIG. 18 (a), core back portion 22 in the present embodiment has a plurality of teeth connecting portions 22a connecting inner teeth portions 21 on its inner peripheral side. Further, tooth connecting portions 221b are also provided at portions located on the inner side of the core at both ends thereof. The teeth connecting portion 221a is provided in a form to be fitted with the connecting portion 213 on the teeth portion 21 side. In the present embodiment, the shape has a form that forms a dovetailed groove structure. As shown in FIG. 18 (a), a cutout 228a is provided in the connecting portion 221a. In the element piece 220, a shallow cut 228b is provided on the outer peripheral side of the position where the cut 228a is provided. The notch 228a is cut out in a V-shape at an angle where the edges of the notch 228a do not overlap with each other when the element piece 220 is bent. On the other hand, the notch 228b is intended to spread and facilitate bending when the piece 220 is bent. Therefore, any other shape may be used as long as it has such a function.

When the teeth connecting portions 2 2 1 b at both ends are adjacent to each other piece 220, respectively, the teeth connecting portions 2 2 1 b are fitted to the connecting portions 2 1 3 of the tooth portions 21 similarly to the tooth connecting portions 2 21 a. The end face (divided end part 220 b) on which the connecting part 221 b is provided is formed with a shape that constitutes a dovetailable groove structure. The inner peripheral side is cut off diagonally so that a gap, for example, a V-shaped gap is formed when connecting. The core of the present embodiment is formed by laminating the above-mentioned pieces 220. In the present embodiment, first, a piece as shown in FIG. 18 (a) is punched out and bent as shown in FIG. 18 (b) to bend. Then, using the plurality of pieces 220 thus processed, as shown in FIG. 18 (c), the plurality of pieces 220 are arranged in a row in a row, and A plurality of these are laminated to form a core back portion 22.

 The element 220 is provided with a caulking portion 229 for caulking when laminating. Therefore, after all the pieces 220 are stacked, the whole is pressurized, and the caulking part 229 is caulked.

 As described above, the element 220 constituting the core back portion 22 is preferably made of a material having a large saturation magnetization. For example, the above-described directional silicon steel sheet or the like is used. The element 220 used in the present embodiment is

 On the other hand, as the teeth portion 21, for example, as shown in FIG. 17 (b), a member obtained by laminating members obtained by individually punching plate materials is used. The tooth portion 21 is also caulked by the caulking portion 2 19. As a material, as described above, for example, a non-oriented silicon steel sheet is used.

 Next, a method of manufacturing a core according to the present embodiment will be described.

 In the present embodiment, the piece 220 forming the core back portion 22 is formed into a punched shape as shown in FIG. 18 (a), that is, the portion 221, in which the teeth 21 are arranged, is formed. The sheet is punched out in a bent shape, and bent as shown in FIG. Then, as shown in FIG. 7C, the core back portions 22 are formed by lamination. The base end 213 of the tooth part 21 is attached to the tooth connecting part 221 of the core back part 22. The teeth portion 21 incorporating the coil 1 is press-fitted into the core back portion 22 to obtain a stay.

Here, the teeth part 21 is the same as the teeth part of the core back part 22 described above. The base 2 13 is fitted into the joint 2 2 1. The fitting can be performed, for example, by fitting the base end 2 13 into the teeth connecting portion 2 21 along the axial direction of the core and displacing the teeth portion 21 in the axial direction in this manner. The state in which the teeth 21 are attached to the core back 22 is shown in FIG. 18 (d). FIG. 18 (d) does not show the state in which the coil is mounted, but actually, the teeth 21 are mounted on the core back 22 after the coil molded body 1 is mounted thereon. Is done.

 In order to hold this stay core, it is assembled to an outer frame called a housing. For example, a cylinder is used as the housing. As the material, for example, iron, aluminum, or the like is used. The thickness of the cylinder is, for example, about 2 to 10 mm.

 Assembling of the core back portion 22 to the housing 4 is performed by press fitting, shrink fitting, or the like. In the case of shrink fitting, the cylindrical housing 4 is heated and expanded.

In this state, as shown in FIG. 19 (a), insert the core back 22 into which the coil and the teeth are mounted, into the housing 4. Thereafter, the temperature of the housing 4 is reduced and contracted, and a stress due to the contraction acts on the inner core back portion 22. That is, a stress is applied to the core back portion 22 along the radial direction and toward the center. For this reason, the core back portion 21 contracts so that the radius becomes smaller as a whole. Specifically, cuts, gaps, etc. are blocked. This state is shown in FIG. 19 (b). That is, the cuts 228a are closed, and the gaps at the ends (divided ends 220b) of the respective pieces 220 are eliminated. In addition, the lateral end 2 11 a of the tip 2 1 1 of each tooth 2 1 and the lateral end 2 11 a of the tip 2 11 of the adjacent tooth 2 1 are in contact with each other. It has become.

Thus, in the present embodiment, as shown in FIG. The core back 22 is compressed by shrink fitting of the jing 4. Further, since the stay of the present embodiment is composed of the element 2.20, the core back 22 is divided into a plurality of parts. As a result, when assembled to the housing, a divided end 22 Ob is generated at each end of the continuous piece. Stress is generated so as to reduce the gap between the divided ends 220b and the above-mentioned cuts. For example, if the outer diameter of the stator after assembly is Φ1000.5mm, if the housing for shrink fitting is d = Φ100mm and the material is aluminum, the expansion rate will be since it is α = 2 3. 1 X 1 0- 6, the temperature difference t = 3 00 increases from room temperature, the amount of expansion,

 δ = a d t = 0.6.93 mm

Becomes Therefore, the inner diameter of the housing is 100.693 mm, which is larger than the outer diameter of the stay. By assembling in this dimensional relationship and cooling the housing, the inner diameter of the expanded housing becomes smaller, and the outer diameter of the stay is tightened.

 The amount of tightening at this time is determined by the housing, the thickness of the stay, the material, and the like. For example, in the example above, the final housing inner diameter is 100.

2 mm.

As a result, the outer diameter of the stay becomes 10.2 mm at the same time. Therefore, it can be said that the outer diameter shrank by 0.3 mm from the dimensions after assembly.

 As a result, the gap between the two ends of the stay at the end of the stay is 0.

3 π = 0.92 mm smaller. Therefore, as shown in Fig. 19 (b), if there are 12 gaps and cuts, it is possible to reduce the gap of 0.0078 mm per one place.

Also, in this structure, the teeth are arranged at the divided end 220b and the cut-out portion 228a of the core back portion 22, so that the gap of the core back portion 22 is reduced to reduce the assembly gap of the teeth portion. Tighten at the same time be able to. Therefore, it is possible to increase the mechanical strength of the teeth portion and the core back portion.

 As a method of tightening the housing, in addition to shrink fitting of the housing, there are a method of tightening with a sleeve and a method of tightening with a steel band. The sleeve is a method of assembling a cylinder of stainless steel or iron with a wall thickness of 0.2 to 0.3 mm, and has the advantage that the outer diameter of the motor can be reduced. Further, it is also conceivable that the steel band 7 as shown in FIG. 20 is wound around and tightened by fastening such as welding or caulking at the joint of the band 7.

 Also, as shown in FIGS. 21 (a) and 21 (b), the outer peripheral portion of the divided end portion 22Ob of the core back portion 22 is welded while being tightened from the outer periphery, The tightened state can be maintained. As shown in FIG. 21 (a), in the present embodiment, in addition to the divided end 220b, the notch 228b is also welded for reinforcement. Welding of the notch 2 228 b can be omitted. In Fig. 21 (a), the notation of coils is omitted.

Further, as another method, there is a method of fastening a core by a mold as shown in FIG. In this method, the coil end of the stay core is wrapped with a resin material. As shown in Fig. 22 (a), the wound core 2 is set in a mold 9 and resin 10 is poured into both ends (coil end) of the mold. I do. At this time, the resin 10 is poured in a state where the core 2 is tightened by the molding die 9, and the grooves provided inside the slot portion of the core 2 and on the outer periphery of the core are filled with the resin. As a result, the steel overnight core 2 will be concluded. As a result, as shown in Fig. 22 (b), the core can be fixed while keeping the clearance of the core back joint portion reduced by tightening. According to this method, the core can be fastened without increasing the outer peripheral portion of the core. In any of the above methods, by having the above-mentioned divided structure, the gap between the core divided portions is reduced, and the coupling strength with the teeth portion is obtained. Also in the embodiment described above, the material can be used efficiently for the same reason as described above.

 Further, the segment 220 is not limited to the above-described embodiment. For example, as other forms, the shapes shown in FIG. 23 are possible, each having advantages. The shape shown in FIG. 23 (a) is an example in which the core back portion 22 described above is punched in a shape after being bent in advance. In this example, the layers are laminated without bending. In this case, the mechanical strength in the circumferential direction can be increased. This is a method by which the decrease in magnetic resistance can be halved. The shapes shown in FIG. 23 (b) and FIG. 23 (c) are punched out in the shape after the bending as in the example shown in FIG. 23 (a). In these examples, to provide a stress concentration portion for reducing the circumferential length by shrink fitting stress etc. from the outer peripheral portion after assembly, the slit grooves 228c and 228d are formed in the joint at the time of punching. This is to create the shape that is inserted. According to this shape, joint strength with the teeth portion and minimization of the gap can be realized by the stress generated by shrink fitting or the like, that is, the stress that reduces the gap as described above. There is a difference in this point from the shape in Fig. 23 (a).

 The shapes shown in Fig. 23 (d) and Fig. 23 (e) are punched in the shape after bending at the time of punching press. In this example, the thinned portions 228 e and 228 f are formed by stamping and thinning the joint portion with the teeth portion. As a result, the parts that are vulnerable to stress, that is, the stress concentrating parts, are actively provided, and the stress such as shrink fit, that is, the stress that reduces the gap, minimizes the joint strength with the teeth and minimizes the gap. It was made possible.

In each of these methods, as shown in FIG. 23 (f), a structure in which the core back unit 3 is connected can be used. It is possible to adopt a connected shape.

 The above-mentioned piece 220 can be provided in a series from a band-shaped material, for example, as shown in FIG. 14 (b). Further, as shown in FIG. 23 (g), it can be formed so as to be individually punched from the strip.

 Next, a third embodiment of the present invention will be described with reference to FIGS. 24 (a) and 24 (b). This embodiment is basically the same as the above-described embodiment except that the mode of lamination of the pieces 220 is different. For example, it is configured in the same way when mounting coils, assembling a housing, and manufacturing a rotating machine. Therefore, the description will focus on the differences.

 The embodiment shown in FIG. 24 (a) relates to a rotating machine core having a core back portion and a plurality of teeth portions. In this embodiment, similarly to the other embodiments described above, core back portion 22 and a plurality of teeth portions 21 are provided separately. The core back portion 22 has a plurality of teeth connecting portions 22 1 a and 22 lb connecting the respective tooth portions 21 on its inner peripheral side. The teeth portion 21 has a structure in which the base end 21 is attached to the teeth connecting portion 22 a or 22 lb and connected to the core back portion 22.

 Here, the core back portion 22 has a structure in which a plurality of pieces 220 are continuously arranged in a ring shape and a plurality of layers are stacked. Further, the core back portions 22 are arranged such that the pieces 220 are shifted in the circumferential direction in units of slot pitch between adjacent layers. At the time of lamination, caulking is performed in the caulking part 229. With such a configuration, the tooth connecting portions 22a and 22b are arranged at an equal pitch (slot pitch) on the inner peripheral edge of the core as in the above-described embodiment. These tooth connecting portions 22a and 22b extend along the axial direction of the core.

Next, the embodiment shown in FIG. 24 (b) relates to a rotating machine core having a core back portion and a plurality of teeth portions, similarly to FIG. 24 (b). It is. In the present embodiment, the core back portion 22 has a plurality of blocks 220 formed by laminating a plurality of pieces 220 and is arranged in a ring shape, and a plurality of the blocks 220 a are laminated. It is the structure which did. Other configurations are the same as those in FIG. 24 (a).

 The core back portion 22 is arranged such that the blocks 220a are shifted in the circumferential direction by a slot pitch between adjacent layers.

 In the present embodiment, in addition to the illustrated piece 220, pieces of various forms shown in FIG. 23 described above can be used.

 Further, in this embodiment, the tooth portions can be connected by using the other embodiments described above. In addition, for example, a tooth part 21 having a form as shown in FIGS. 27 (a) and 27 (b) can be used. In other words, as shown in FIG. 27 (a), the plates which are individually punched from the band-shaped plate and which have the caulking portions 219 at two places are laminated and crimped to obtain a plate as shown in FIG. 27 (b). ) Can be used.

 When the various element shapes shown in FIGS. 23 (a) to (f) are used, the material utilization rate is improved. For example, as shown in FIG. 23 (g), when a piece 220 is punched from a plate material, the material utilization rate is 70% or more. When the teeth 21 are individually punched from a band-shaped plate in the form as shown in FIG. 27, for example, a material utilization rate of 70% or more can be achieved.

 Next, a modification example of the structure of the joint portion between the tooth portion and the core back portion will be described with reference to FIG. Fig. 26 (a), (b) and (c) are all combinations of the presence (proximal end 21 3) and the presence groove (teeth connecting portion 22 1).

FIG. 26 (a) shows the corners of the dovetail and the dovetail groove having an R-chamfered shape. Also, Fig. 26 (b) shows the two sloped shapes with each other. The shape with a dovetail groove is shown. FIG. 26 (c) has a connection portion similar to that of FIG. 26 (b), and the core back portion has at least two cuts 228 (or a thin portion). . Tightening stress is applied to both sides of the notch, thin wall, etc. at the center, and when stress is applied, the teeth 21 are tightened by the stress.

 Next, another embodiment of the laminated structure of the core will be described with reference to FIG. In the first embodiment described above, as a material constituting the core back portion 22, a shape in which a material punched in a linear shape is bent and wound to increase the material utilization rate of the core is proposed. . However, the callback section 22 does not necessarily need to use a material connected in series. Therefore, as described above, the element pieces are punched out, arranged so as to be continuous along the circumference of the core back portion, and laminated. In addition, a configuration in which a block is formed by stacking a plurality of element pieces, and the blocks are connected along the circumference of the core back portion and are stacked. By using the element pieces as described above to compose the core back part 220, the die for punching is small and the punching processing force is small, so setup change for model change Such an effect can be expected.

 Now, in the present application, a more preferable embodiment is proposed when laminating pieces. Referring to FIGS. 28 and 29,

 Fig. 28 shows the method of laminating laminated steel sheets. Laminated steel plate is a method of combining the upper and lower plates with the half-opened portion such as HAC caulking or dowel caulking. However, there may be a problem that the insulation between the plates is broken at that portion and a current loop or the like occurs.

The caulking method shown in FIG. 28 (a) is an assembling method in which the pieces 220 are staggered by one slot pitch alternately one layer at a time, as described in FIG. 24. In the present embodiment, two or more force-screws 22 2 ′ 9 are provided on the piece 220, and one of the force-screws 22 a is half-blanked. Then, a convex portion 229 c is provided, and the other caulked portion 229 b is processed in a fully punched state to form a through hole 229 d. The caulking portions 229a and 229b are provided at intervals of one slot pitch. Therefore, if the upper and lower segments 220 are shifted by one slot pitch in the circumferential direction, caulking can be performed at the positions shifted by one slot pitch.

 Here, as shown in FIG. 24, when all are in a half-punched state, the crimping mode is the same even if the upper and lower pieces 220 are shifted. However, in the example shown in FIGS. 28 (a) to 29 (d), the half-opened projections 229c are formed by stacking the segments 220 alternately. It is connected to the through hole 229 d of the upper plate, but not to the through hole 229 d of the upper plate. On the other hand, in the part in the fully-extracted state, the projection 229 c of the upper plate is inserted and connected, and there is no connection with the lower plate.

 This makes it possible to cut off the loop through which current flows, thereby improving the characteristics of the motor.

FIGS. 29 (a) and 29 (b) show a laminated structure of a portion of the teeth portion 21 connected to the teeth connecting portion of the core back portion. When laminating a core having notches, grooves, thin portions, and the like described in FIG. 23, there is a possibility that the metal surface will come into electrical contact due to burrs and the like generated during processing of that portion. Therefore, the electrical contact is obstructed by shifting the part up and down. Therefore, in the connecting portion as shown in FIG. 29 (a), as shown in FIG. 29 (b), one of the members to be connected, in FIG. The thickness of 3 is stamped with a press or the like to make the thickness smaller than the plate thickness. This makes it possible to avoid electrical contact between the upper and lower plates due to processing burrs and the like at the joint portion between the core back portion and the tooth portion. For this reason, it is possible to improve the efficiency of the motor itself, including the reduction of the contact part in the caulking part 229. Note that thinning is not limited to the base end portion 2 13 of the teeth portion 21. For example, the tooth connection portion 221 of the core back portion 22 may be thinned.

 Next, improvement measures that can be applied to the above-described embodiments will be described with reference to FIG. That is, as shown in FIGS. 30 (a) and 30 (b), the thickness Lc of the core back portion and the thickness Lt of the teeth portion are crushed and equalized by means of a press or the like. This can be expected to prevent displacement in the thickness direction after assembly.

 As another problem related to the present invention, there is a problem relating to a coil, and such a problem is also pointed out.

 First, in the coil-inser-one-time method, the wound coil is inserted by using the gap in the slot. If the stator coil is inserted after the winding by the insulator method, the space factor ( There is a problem that the ratio of the cross-sectional area of the wire to the cross-sectional area of the core slot cannot be large. At present, the limit of the space factor is 60-65%. Second, even in the concentrated winding method, in the series winding method, the wire is inserted using the gap of the core slot as in the case of the insulator overnight method, so the space factor is not very high (about 60%). Every time) . In addition, even when the core is divided and wound, the space factor is high due to the dimensional relationship such as clearance when assembling the core, uneven winding between wires, and interference between adjacent coils. I can't take it.

 In the above-described embodiments, the problem of improving the space factor of the stator winding in the rotating machine has been solved by using a coil molded body that has been molded in advance. That is, by changing the cross-sectional shape of the coil, the cross-sectional dimensional accuracy can be increased, and the space factor can be improved. As a result, the efficiency of the rotating machine can be improved. In addition, by reducing the size of the core to improve the efficiency, the size of the rotating machine itself can be reduced, and the number of conductors used can be reduced, thereby reducing material costs.

Industrial applicability ADVANTAGE OF THE INVENTION According to this invention, there exists an effect which raises the utilization rate of the iron core material in the stator of a rotary machine. Further, according to the present invention, it is possible to configure a portion requiring high magnetic flux density and a portion not requiring high magnetic flux density by using respective optimum materials.

 In addition, material costs can be significantly reduced in terms of material utilization. As a result, the rotating machine, particularly the electric motor, is a key part of the set product, so that the set product using the motor can be reduced in size, weight, and cost.

Claims

% Of I®

 1. In a rotating machine core having a core back portion and a plurality of tooth portions, the teeth portion is formed of a directional silicon steel plate, and the core back portion is formed of a non-directional silicon steel plate. A core for a rotating machine.

2. In the rotating machine core having a core back portion and a plurality of teeth portions, the teeth portion and the core back portion are each formed of different materials, and the teeth portions are materials having a higher saturation magnetization than the core back portion. A core for a rotating machine characterized by being formed.

 3. The core for a rotating machine according to any one of claims 1 and 2, wherein the core back portion has a structure in which a plurality of pieces are continuously arranged in a ring shape and a plurality of layers are stacked.

A core for a rotating machine.

 4. In a rotating machine core having a core back portion and a plurality of teeth portions, the core back portion and the plurality of teeth portions are provided separately from each other, and the core back portion is provided on the inner peripheral side thereof with each of the teeth. A plurality of teeth connecting portions for connecting the teeth, the teeth having a base end attached to the teeth connecting portion and connected to the core back portion; and

 The core for a rotating machine, wherein the core back portion has a structure in which a plurality of pieces are continuously arranged in a ring shape and a plurality of layers are stacked.

5. The rotating machine core according to claim 4,

 The core for a rotating machine, wherein the core back portion is arranged such that the element pieces are shifted in a circumferential direction in slot pitch units between adjacent layers.

6. In a rotating machine core having a core back portion and a plurality of teeth portions, the core back portion and the plurality of teeth portions are provided separately from each other, and the core back portion is provided on the inner peripheral side thereof with each of the teeth. A plurality of teeth connecting portions for connecting the teeth, a base end of the teeth portion is mounted on the teeth connecting portion and connected to the core back portion, and the core back portion has a plurality of teeth connecting portions. A rotating machine core having a structure in which blocks in each of which several pieces are stacked are arranged in a ring shape.

 7. The rotating machine core according to claim 6, wherein

 The core for a rotating machine, wherein the core back portion has a structure in which the blocks are stacked in a plurality of layers.

 8. The rotating machine core according to claim 7,

 The core back portion disposes the blocks in a circumferential direction by a unit of a slot pitch between adjacent layers.

A core for a rotating machine.

 9. The rotating machine core according to any one of claims 4 to 8, wherein the element piece has a curved shape.

 10. The rotating machine core according to any one of claims 4 to 8, further comprising a fastening member for fastening the core back portion from outside, wherein the fastening member fastens the core back portion from outside. A core for a rotating machine, wherein each end of each piece of the core back portion is brought into circumferential contact with each other.

 1 1. In the rotating machine core,

 A core back portion, and a plurality of teeth portions mounted on an inner peripheral side thereof, and a fastening member for fastening the core back portion from outside, wherein the core back portion is divided into a plurality of portions in a circumferential direction. A core for a rotating machine, having a structure, wherein the fastening member fastens the core back portion from the outside and makes the divided portions of the core back portion closely contact in the circumferential direction.

 1 2. The rotating machine core according to claim 11,

The core for a rotating machine, characterized in that the core back portion has a connecting portion on the inner peripheral side for connecting the teeth portion, and the connecting portion is provided corresponding to a slot pitch.

13. The rotary machine core according to any one of claims 10, 11, and 12,

 A core for a rotating machine, wherein the fastening member is formed of a sleeve, and the core back portion is fitted inside the sleeve.

 14. The rotary machine core according to any one of claims 10, 11 and 12, wherein:

 The rotating machine core, wherein the fastening member is a band-shaped member wound around the outer periphery of the core back portion.

 15. The rotary machine core according to any one of claims 10, 11 and 12, wherein:

 The rotating machine core, wherein the fastening member is a mold resin surrounding the outer periphery of the core back portion.

 16. The rotating machine core according to any one of claims 4 to 15, wherein the core back portion is formed by welding a series of pieces.

 1 7. In a rotating machine core having a core back portion and a plurality of teeth portions,

 The core back portion and the plurality of teeth portions are provided separately from each other, and the core back portion has a plurality of tooth connecting portions connecting the respective tooth portions on an inner peripheral side thereof. The base end is attached to the tooth connecting portion and connected to the core back portion, and the tip of each tooth portion is formed in an arc shape, and is sequentially attached to the core back portion while being attached to the core back portion. A rotating machine core, which forms a circumference with the tip of the tooth portion of the rotating machine.

18. In a rotating machine core having a core back portion and a plurality of teeth portions,

The core back portion and the plurality of teeth portions are provided separately, and the core The back portion has a plurality of teeth connecting portions connecting the respective tooth portions on an inner peripheral side thereof, and the teeth portion has a base end attached to the tooth connecting portion and connected to the core back portion, A core for a rotating machine, wherein a tip of each tooth portion is formed in a straight line and, when attached to the core back portion, forms a polygon with the tips of other adjacent teeth in order.

 1 9. The rotating machine core according to claim 1, wherein

 A core for a rotating machine, wherein the teeth portion is an integral teeth assembly connected on the distal end side.

20. The rotating machine core according to claim 1, wherein:

 The core for a rotating machine, wherein the teeth are formed by laminating independent plate members.

 21. The rotating machine core according to any one of claims 4, 5, 6, 7, 8, 9, 9, 10, 12, 17, 18, 19 and 20.

 The tooth connecting portion of the core back portion has a dovetail groove structure, and a dovetail that fits into the dovetail groove is provided at a base end portion of the tooth portion as a connecting portion. core.

 2 2. The rotating machine core according to claim 4, 5, 6, 7, 8, 9, 10, 12, 17, 18, 19 and 20.

 A teeth connecting portion of the core back portion, and a rotating machine core, wherein one thickness of a base end portion of the teeth portion is made thinner than the other portion,

2 3. In the core back used for the rotating machine core,

 A core back having a structure in which a plurality of pieces are arranged in a row in a ring and a plurality of pieces are stacked.

24. In the core bag according to claim 23,

The element has a tooth connecting portion for connecting a tooth portion to an inner peripheral side of a core back portion, and the tooth connecting portion is connected to a central axis of the core. A core back, wherein the plurality of layers are stacked while maintaining a positional relationship of being aligned in a line in parallel.

 25. In the core bag according to claims 23 and 24,

 A core back, characterized in that the element has, at a part thereof, a part which is easily deformed when stress is applied compared to other parts.

 26. In the core bag according to claim 25,

 A core back, wherein a thin-walled portion for reducing the thickness is provided around the bending center portion as the easily deformable portion.

27. In the core bag according to claim 26,

 A core back characterized in that the thin portions are arranged so as to be at different positions in the laminated pieces.

 28. In the core bag according to claim 25,

 A core back, characterized in that a notch is provided at a bending center portion as the easily deformable portion.

29. In the core bag according to claim 28,

 A core back, wherein the cutouts are arranged at different positions in the stacked pieces.

 30. The core back according to claim 28, wherein the notch is provided in two or more places.

31. In the core back according to claims 23 to 30,

 The element has a plurality of caulked portions for fixing the laminated pieces to each other, one of the caulked portions is a convex portion, the other is a through hole, and the convex portion is The through-hole is press-fitted into a through-hole of another element to be laminated, and the through-hole is a part into which a convex portion of another element to be laminated is press-fitted, and the convex and the through-hole are laminated. A core back characterized in that it is arranged in a positional relationship that makes a pair with a through-hole and a convex portion of upper and lower element pieces.

3 2. By stacking multiple layers, the core back that forms the core for the rotating machine is formed. In the piece to form,

 A core back element characterized by having a curved shape in which a plurality of sheets are connected to form a ring, and having a connecting portion for connecting teeth of a rotating machine on a side serving as an inner periphery of the core back. Pieces.

33. The core back piece according to claim 32,

 The connecting part is provided at least at both ends, and is formed in a form in which the teeth can be connected when connected to another element. .

 34. The core back piece according to claim 32,

 A piece for a core back, wherein the connecting portion is provided at at least one position in an intermediate portion.

 35. The core back piece according to any one of claims 32, 33 and 34,

 The connecting portion is provided at at least one position in an intermediate portion and at both ends. When the connecting portions provided at the both ends are in a state of being connected to another element, the teeth can be connected. A core back piece characterized in that it is formed in a form.

 36. In a method of manufacturing a rotating machine core having a core back portion and a teeth portion,

 A member constituting a core back portion having a tooth connecting portion to which the tooth portion is to be connected is punched out of a belt-shaped member, and cut into a length corresponding to a size of a core to be manufactured, thereby forming the core back portion. A member to be laminated is laminated to a desired thickness, the teeth connecting portion is bent with the inner peripheral side, and both ends of the member are fixed to form a core back portion,

It has a connecting portion with the teeth connecting portion of the member constituting the core back portion, and punches out a member in a state where the tips of the teeth portions are connected from the belt-shaped member, according to the size of the core to be manufactured. Cut to length, said When a plurality of members constituting the teeth portion are laminated to a desired thickness, the teeth are bent in a ring shape at the same time or sequentially (in any order) with the tips of the teeth facing outward, and both ends of the member are fixed. A tooth assembly is formed, a pre-formed coil molded body is attached to each tooth portion of the tooth assembly, and the tooth assembly is inserted into the inner periphery of the core back portion. A method of manufacturing a core for a rotating machine, comprising: attaching a connecting portion of the tooth member to the core member; and fixing each tooth portion to a core back portion.

 37. The method of manufacturing a core for a rotating machine according to claim 36,

 When forming the core back portion, a piece having a length of at least two slots is punched out of the plate material, and each piece is successively arranged in the circumferential direction of the core back in a ring shape, and one slot is provided every other layer. A method for manufacturing a core for a rotating machine, comprising laminating a plurality of slot pitches including a top pitch while shifting each other.

38. In the method for manufacturing a rotating machine core according to claim 36,

 When forming the core back part, a piece having a length of at least 2 slots is punched out of the plate material, and a block formed by laminating a plurality of pieces is successively arranged in the circumferential direction of the core back and arranged in an annular shape. And a method of manufacturing a core for a rotating machine, wherein a plurality of slot pitches each including one slot pitch are shifted from each other for every one layer of the block.

39. In a method of manufacturing a core for a rotating machine having a core back portion and a teeth portion,

 The core back portion is formed in a structure divided at a plurality of positions in a circumferential direction, and the teeth portion is connected,

A core having an inner diameter smaller than the outer diameter portion of the core is expanded by giving a temperature difference, and the core back portion is fitted in the housing, and the housing cools and contracts, thereby forming the core. A method of manufacturing a core for a rotating machine, wherein a stress is applied in a circumferential direction.

40. In a method for manufacturing a rotating machine core having a core back portion and a tooth portion,

 The core back portion is formed in a structure divided at a plurality of positions in a circumferential direction, and the teeth portion is connected,

 A method for manufacturing a core for a rotating machine, characterized in that the core back portion is tightened from outside by a tightening member so that stress is applied in a circumferential direction of the core.

 41. The method of manufacturing a core for a rotating machine according to claim 40,

 A method for manufacturing a core for a rotating machine, comprising: fastening a belt-shaped member that has been tightened by welding while maintaining the tightened state.

 42. The method of manufacturing a core for a rotating machine according to claim 39 or 40, wherein a stress is applied in a circumferential direction of the core, and furthermore, a joint portion of the outer peripheral portion of the core is fastened by means such as welding. A method for producing a core for a rotating machine, wherein a stress remains on the inner peripheral side even after fastening.

4 3. In a method of manufacturing a rotating machine core having a core back portion and a teeth portion,

 In order to apply stress to reduce the gap between the divided core backs, after assembling the stay coil, tighten the stay with a resin mold to apply pressure to the coil end and the gap inside the slot. A method for manufacturing a core for a rotating machine, comprising casting a resin into a core.

 4 4. In a method of manufacturing a rotating machine core having a core back portion and a teeth portion,

 The tooth part and the core back part are formed by laminating plate materials, and the parts that are connected to each other are processed to be thinner than the original plate material, and then the teeth part is bonded to the core back part. A special method for manufacturing cores for rotating machines.

45. In a method of manufacturing a rotating machine core having a core back portion and a teeth portion. And

 A rotating machine characterized in that the teeth portion and the core back portion are formed by laminating plate materials, respectively, and the laminated teeth portion and the core back portion are each compression-molded, and the respective stacked thicknesses are made uniform before being joined. Of manufacturing cores for

 46. A rotating machine characterized by having a stay formed by winding a preformed coil around a tooth portion of the rotating machine core according to any one of claims 1 to 22.