JP7394216B2 - Stator of rotating electric machine and its assembly method - Google Patents

Description

The present invention relates to a stator for a rotating electrical machine and a method for assembling the same .

There are two types of stator coils for rotating electric machines: concentrated winding, in which wires are wound in a concentrated manner around each magnetic pole tooth to form a coil, and wires are wound across multiple slots, with out-of-phase or There is also distributed winding, in which coils of the same phase overlap each other. Concentrated winding allows the coil end to be smaller than distributed winding, and is effective in downsizing and increasing efficiency of rotating electric machines. On the other hand, distributed winding can make the rotating magnetic field distribution on the inner circumference of the stator closer to a sine wave, and can achieve higher output and lower noise than concentrated winding.

For insulation between the stator core and the stator coils, a resin molded bobbin is generally used in the case of concentrated winding, and insulating paper is generally used in the case of distributed winding.

Japanese Unexamined Patent Publication No. 2009-148093 (Patent Document 1) discloses a technique for insulating with a bobbin made of a resin molded product. In the bobbin of Patent Document 1, a substantially rectangular parallelepiped bobbin body and a collar portion provided on the outer diameter side of the bobbin body are integrally molded with resin (see paragraphs 0044, 0046, and 0047).

Furthermore, Japanese Patent Application Laid-Open No. 2015-50428 (Patent Document 2) discloses a technology that reduces the thickness of the insulating part by using insulating paper in a part of the bobbin and improves the space factor of the stator coil. Disclosed. The bobbin of Patent Document 2 has a core material having a substantially H-shaped cross section in which a groove with a rectangular cross section is formed, and a U-shaped insulating sheet attached to the groove, which are arranged in an injection molding cavity. Resin is injected to form a bobbin with resin moldings on the front and rear of the core material (see summary).

Japanese Patent Application Publication No. 2009-148093 JP 2015-50428 Publication

In the bobbin of Patent Document 1, a flange portion for insulating a substantially rectangular parallelepiped bobbin body and a stator core and for fixing a stator coil is integrally molded. In order to wind more stator coils, the insulation between the stator core and the stator coils is required to be as thin as possible to obtain the required insulation performance. On the other hand, the fixed portion of the stator coil needs to have enough strength to withstand the load when the coil is wound. In order to improve the strength of the resin material, it is necessary to use a material containing glass fiber or the like. However, materials containing glass fiber or the like have poor fluidity during molding. When a resin material with low fluidity is used, it is necessary to increase the minimum thickness of the insulating portion, which results in a decrease in the space factor of the stator coil.

In the bobbin of Patent Document 2, insulating paper is arranged in the insulating part to prevent a decrease in the space factor of the stator coil, and the fixing part of the stator coil is formed of injection molded resin. By impregnating the surface of the insulating paper containing short fibers with the resin molded body melted during injection molding, the resin molded body and the insulating paper are integrally produced. Here, the stator core is made of laminated steel plates, and the resin molding is molded on the surface of the laminated steel plates. The laminated steel plates that make up the stator core are made using a technique called caulking, in which the surface of the steel plates is made uneven, and the uneven parts of adjacent steel plates are engaged in the stacking direction, and pressure is applied in the stacking direction to plastically deform the uneven parts and join them together. It is common to use
By fixing the laminated steel plates by caulking and making the laminated steel plates into an integral part, it is possible to improve the workability of handling the laminated steel plates.

On the other hand, when the laminated steel plates are fixed by caulking, the stator core is likely to warp due to the fact that the caulked areas are difficult to deform during coil winding, and the non-caulked areas are easily deformed. Become. In a stator in which a molded resin body and an insulating paper are integrally molded, if the stator core becomes warped, it becomes a factor that reduces the insulation reliability, such as damage to the joint between the insulating paper and the bobbin.

An object of the present invention is to provide a stator for a rotating electrical machine with excellent insulation reliability and a method for assembling the same .

In order to achieve the above object, the stator of the rotating electrical machine of the present invention has the following features:
A stator for a rotating electric machine, comprising a stator core made of a plurality of laminated electromagnetic steel plates, and a stator coil wound around the stator core with an insulator interposed therebetween,
The insulator includes a first bobbin portion and a second bobbin portion made of resin provided at both ends of the stator core in the rotational axis direction of the rotating electric machine, and a first bobbin portion and a second bobbin portion. an insulating sheet covering a side surface of the stator core around which the stator coil is wound;
The electromagnetic steel sheet has a flat surface with a smooth contact surface with an adjacent electromagnetic steel sheet in the stacking direction,
The first bobbin part and the second bobbin part are injection molded parts that are molded by placing the stator core in a resin mold and injecting resin while applying a clamping force. , the first bobbin part and the second bobbin part are connected to each other by the insulating sheet, and are bonded to the insulating sheet during resin injection molding;
In the stator core, the restoring force of the plurality of electromagnetic steel plates after injection molding of the first bobbin part and the second bobbin part is balanced with the tension of the insulating sheet, so that the plurality of electromagnetic steel plates are in close contact with each other. is retained.
Moreover, in order to achieve the above object, the stator of the rotating electric machine of the present invention includes:
It has a stator core made of a plurality of laminated electromagnetic steel plates, and a stator coil wound around the stator core with an insulator interposed therebetween, and the insulator A first bobbin part and a second bobbin part made of resin are provided at both ends of the stator core, and the stator coil is wound between the first bobbin part and the second bobbin part. A method for assembling a stator of a rotating electric machine comprising: an insulating sheet covering a side surface of a child core;
The electromagnetic steel plates are composed of electromagnetic steel plates of the same shape in which the contact surfaces of adjacent electromagnetic steel plates in the stacking direction are smooth planes,
The electromagnetic steel plates are created by punching out a plate-like member, and the electromagnetic steel plates are successively laminated in the order in which they are punched to constitute one stator core, and the next stator core constitutes the previous stator core. Consisting of continuous lamination from the last electromagnetic steel plate to the next electromagnetic steel plate,
The first bobbin part and the second bobbin part are molded by placing the stator core in a resin mold and injecting resin while applying mold clamping force, and by injection molding the resin. At times, the first bobbin portion and the second bobbin portion are connected by the insulating sheet, and are bonded to the insulating sheet;
The stator core is in a state in which the plurality of electromagnetic steel plates are in close contact with each other because the restoring force of the plurality of electromagnetic steel plates after injection molding of the first bobbin part and the second bobbin part is balanced with the tension of the insulating sheet. is maintained.

According to the present invention, it is possible to provide a stator for a rotating electrical machine with excellent insulation reliability. Problems, configurations, and effects other than those described above will be made clear by the following description of the embodiments.

FIG. 1 is a sectional view showing the overall configuration of a rotating electric machine RM according to an embodiment of the present invention. FIG. 2 is a perspective view of an assembly of a stator core 5, a bobbin 6, and an insulating paper 1 according to an embodiment of the present invention. FIG. 1 is a perspective view of a stator 100 using a concentrated winding stator core 8 according to an embodiment of the present invention. FIG. 2 is a perspective view of a concentrated winding stator core 8 according to an embodiment of the present invention. FIG. 2 is an exploded view showing the structure of an assembly of a stator core 5, a bobbin 6, and an insulating paper 1 according to an embodiment of the present invention. FIG. 2 is a partial sectional view showing a part of a section of a stator core 5 perpendicular to the axial direction of a shaft 12 according to an embodiment of the present invention.

Embodiments of the present invention will be described below using a rotating electric machine used in an electric vehicle. The rotating electric machine of this example has the function of a motor that drives the wheels of the vehicle and the function of a generator that generates electricity using regeneration, and these functions can be switched depending on the driving conditions of the vehicle. used.

First, the overall configuration of a rotating electric machine according to an embodiment of the present invention will be described using FIG. 1. FIG. 1 is a sectional view showing the overall configuration of a rotating electrical machine RM according to an embodiment of the present invention.

The rotating electrical machine RM described in this embodiment is for a hybrid vehicle. The rotating electric machine RM is mounted between the engine and the transmission or inside the transmission.

The rotating electric machine RM is surrounded by a case 130. Here, when the rotating electric machine RM is placed between an engine and a transmission, the case 130 can be configured by an engine case or a transmission case. Further, when the rotating electric machine RM is installed in a transmission, the case 130 can be configured by the case of the transmission.

The rotating electrical machine RM is a three-phase synchronous motor with a built-in permanent magnet. By supplying a large current (for example, 400 A) of three-phase alternating current to the stator coil, the stator coil operates as an electric motor. Furthermore, when the rotating electrical machine RM is driven by the engine, it operates as a generator and outputs three-phase AC generated power. When operating as a generator, the current output from the stator coil is smaller than when operating as a motor, for example, 100A. Further, the rotating electrical machine RM used in this example is a flat rotating electrical machine whose thickness in the direction of the rotating shaft (the axial direction of the shaft) is smaller than the outer diameter.

The rotating electric machine RM includes a rotor 200, a stator 100, and a housing 9. The rotor 200 is arranged on the inner peripheral side of the stator 100 with a gap interposed therebetween. The rotor 200 is fixed to the shaft 12. Both ends of the shaft 12 are rotatably supported by bearings 14A and 14B. The outer periphery of the stator 100 is fixed to the inner periphery of the housing 9.
The outer circumference of the housing 9 is fixed to the inner circumference side of the case 130.

A pump 140 is arranged at the bottom of the case 130. Further, a refrigerant RF reservoir 150 is formed at the bottom of the case 130. For example, insulating oil is used as the refrigerant RF. A portion of the lower portion of the stator 100 is immersed in the refrigerant RF collected in the reservoir 150. Pump 140 sucks the refrigerant RF accumulated in reservoir 150 and discharges it from refrigerant outlets 154A and 154B formed in the upper part of case 130 via refrigerant passage 152.
The refrigerant outlets 154A and 154B are formed at the upper portions of both ends (coil end portions) of the stator coil wound around the teeth of the stator 100. Further, 13 refrigerant outlets 154A are provided. Similarly, 13 refrigerant outlets 154B are provided.

The refrigerant discharged from the refrigerant outlets 154A and 154B is directly sprayed onto the coil end portions at both ends of the stator coil, thereby cooling the coil end portions of the stator coil. The refrigerant RF that has taken away the heat from the stator 100 accumulates in the lower part of the case 130, where it is forcibly circulated through the refrigerant passage 152 by the pump 140, and is again discharged from the refrigerant outlets 154A and 154B. to cool down.

Hereinafter, the stator core 5, the stator coil 7, the assembly of the stator core and the stator coil 7, and the stator 100 will be described using FIGS. 2 to 6.

The form of the stator coil 7 of the rotating electric machine 100 of this embodiment is a concentrated winding coil in which a coil is formed by winding wires in a concentrated manner for each magnetic pole tooth, and the stator core around which the concentrated winding coil is wound. 5 (assembly of stator coil 7 and stator core 5) will be referred to as a concentrated winding stator core 8 and will be described. The stator 100 is constructed by integrally assembling a plurality of concentrated winding stator cores 8.

FIG. 2 is a perspective view of an assembly of the stator core 5, bobbin 6, and insulating paper 1 according to one embodiment of the present invention.

The bobbin 6 constituting the concentrated winding stator core 8 includes a wiring board side resin bobbin (first bobbin part) 61 and an opposite wiring board side resin bobbin (second bobbin part) 62. The connection plate side resin bobbin 61 is a member (one end member) that constitutes one end of the bobbin 6 in the direction of the rotation axis. The opposite-to-connection plate side resin bobbin 62 is a member (other end member) that constitutes the other end of the bobbin 6 in the rotation axis direction. The insulating paper 1 is a connection member that connects the wiring board side resin bobbin 61 and the opposite wiring board side resin bobbin 62.

The specific configurations of the connection plate side resin bobbin 61, the opposite connection plate side resin bobbin 62, and the insulating paper 1 will be described in detail later.

FIG. 3 is a perspective view of a stator 100 using a concentrated winding stator core 8 according to an embodiment of the present invention.

The rotating electric machine RM includes a stator 100 and a rotor 200 (see FIG. 1) coaxially, and is fixed to a transmission case or the like on the vehicle side. The rotor 200 is rotatably held on the inner peripheral side of the stator 100 and transmits the driving force generated between the stator 100 and the rotor 200 to the outside. The stator 100 is formed by having a plurality of concentrated winding stator cores 8 arranged in a ring shape in the circumferential direction within a cylindrical housing 9. The stator 100 is fixed to the vehicle transmission case by inserting a fastening member such as a bolt into a through hole 91 provided in a convex portion 91A on the outer periphery of the housing 9.

FIG. 4 is a perspective view of a concentrated winding stator core 8 according to an embodiment of the present invention.

The concentrated winding stator core 8 is composed of a plurality of concentrated winding coils 7 arranged in a ring shape. FIG. 4 shows a state in which the concentrated winding coil 7 is wound around the bobbin 6.

The concentrated winding stator core 8 includes a stator core 5 in which electromagnetic steel plates 5a are laminated, a resin bobbin 6 disposed so as to cover both end surfaces of the stator core 5 in the rotational axis direction, and the stator core 5. The insulating paper 1 is disposed so as to cover the side surface of the insulating paper 1 and is welded to a bobbin 6 made of resin, and the stator coil 7 is configured by winding an insulating coated conductive wire 7a.

The bobbin 6 is disposed on both end faces of the stator core 5 in the direction of the rotational axis, and electrically insulates between the stator coil 7 and the stator core 5, as well as the winding of the stator coil 7 and the winding start coil. It has locking parts (uneven parts) 6b and 6c that regulate the positions of the end 701 and the coil end 702 at the end of winding. The winding start coil terminal 701 and the winding end coil terminal 702 extend in the direction of the rotation axis of the rotating electric machine RM. The insulating paper 1 is arranged on the side surface of the stator core 5 and electrically insulates between the stator coil 7 and the stator core 5. The yoke portion 51 of the stator core 5 is for connecting adjacent concentrated winding stator cores 8 to form a cylindrical stator 100.

The explanation will be given by returning to FIG. 3 again.

An annular connection plate 2 is arranged on an end surface of a stator 100 of the rotating electric machine RM in the direction of the rotation axis, and a coil end is formed. A plurality of through holes are formed in the connection plate 2, and a coil terminal 70 is inserted into each through hole. In this embodiment, the number of concentrated winding coils 7 is 24, and three coils of U-phase, V-phase, and W-phase are arranged repeatedly eight times. Therefore, the total number of coil terminals 70 is 48. The 24 winding start coil terminals 701 are arranged on the inner peripheral side of the connection plate 2 and are connected to each other to form a neutral point. The 24 coil terminals 702 at the end of one winding are divided into three phases (U phase, V phase, W phase) of 8 coils each, and each phase (U phase, V phase, W phase) is connected to the outer periphery of the wiring board 2. are arranged at different radial positions on the sides. End-winding coil terminals 702 of the same phase are pulled out to positions of the same radius. The eight U-phase coils, eight V-phase coils, and eight W-phase coils are connected as described above to form a three-phase concentrated winding stator core 8.

The coil terminals 701 and 702 are inserted into the through holes of the wiring board 2 and electrically connected to any of the four conductors 3 (U phase, V phase, W phase, neutral point). For this purpose, a connection hole is formed in the conductor 3 arranged on the surface of the wiring board 2, and the end of the coil terminal 70 is inserted through the connection hole so as to protrude from the upper surface of the conductor 3. Thereafter, the end portion of the coil terminal 70 and the periphery of the connection hole are melted by TIG welding to join the coil terminal 70 and the conductor 3.

For example, the coil terminals 701 of the 24 concentrated winding coils 7 are connected to the conductor 3d, forming a neutral point. Coil terminals 702 of eight concentrated winding coils 7 constituting the U phase are connected to the conductor 3a, and the conductor 3a is electrically connected to the terminal TA1. Coil terminals 702 of eight concentrated winding coils 7 constituting the V phase are connected to the conductor 3b, and the conductor 3b is electrically connected to the terminal TB1. Coil terminals 702 of eight concentrated winding coils 7 constituting the W phase are connected to the conductor 3c, and the conductor 3c is electrically connected to the terminal TC1.

FIG. 5 is an exploded view showing the structure of an assembly of the stator core 5, bobbin 6, and insulating paper 1 according to one embodiment of the present invention.

In the assembly of the stator core 5, bobbin 6, and insulating paper 1, a wiring board side resin bobbin 61 is arranged on one end surface 52a of the stator core 5, and a non-wiring board side resin bobbin 62 is arranged on the other end surface 52b. Insulating paper 1 is arranged on both sides of the stator core 5 in the rotating direction.

The resin bobbin 6 and the insulating paper 1 are made of insulating materials, and maintain electrical insulation between the stator coil and the stator core 5 (not shown). When the assembly of the stator core 5, bobbin 6, and insulating paper 1 is assembled, the length L1 of the insulating paper 1 in the direction of the rotation axis corresponds to the rotation of the stator core (laminated electromagnetic steel plate: laminated steel plate) 5. It is larger than the length dimension L5 in the axial direction, and both ends of the insulating paper 1 in the direction of the rotational axis are joined to the joint part 63 of the connection plate side resin bobbin 61 and the joint part 64 of the non-connection side resin bobbin 62, respectively. ing. The insulating paper 1 is a sheet-like insulator (sheet-like insulating member) containing short fibers, and when the resin bobbin 6 is injection molded, the molten resin melts between the short fibers of the insulating paper 1, and the bobbins 61 and 62 are heated. It is in a bonded state.

The insulating paper 1 also has a central portion 1a that faces the side surface of the stator core 5 and covers the side surface, and bent portions 1b and 1c provided on both sides of the central portion 1a in the radial direction of the stator 100. . In the state before the concentrated winding coil 7 is wound, the length dimensions L1b, L1c of the bent portions 1b, 1c in the circumferential direction of the stator 100 are the lengths of the yoke portions 51 protruding from the side surface of the stator core 5. It is larger than the dimension L51.

The stator core 5 is formed by laminating electromagnetic steel plates 5a in the direction of the rotation axis of the rotating electric machine RM (see FIG. 1). The surface of the electromagnetic steel sheet 5a that contacts the adjacent electromagnetic steel sheet 5a is a smooth surface with an insulating coating (a surface without unevenness for caulking), and by insulating between the layers of the laminated electromagnetic steel sheets 5a. , reducing eddy current losses caused by changes in magnetic flux. The stator core 5 is formed by a punching method, and due to effects such as punching distortion, the laminated surfaces are not perfectly flat and there are small gaps between the layers. When molding the resin bobbin 6, the stator core 5 is pressurized in the stacking direction to elastically deform the electromagnetic steel plate, and the resin bobbin 6 and the insulating paper 1 are bonded together with the gap between the layers collapsed. . After injection molding, a repulsive force (restoring force) is generated in the electromagnetic steel sheet 5a that has been elastically deformed in the direction in which gaps between layers occur (laminated direction), but between the resin bobbins 61 and 62 on both end faces in the laminated direction. The distance is regulated by the length of the insulating paper 1, and the repulsive force of the electromagnetic steel sheets 5a and the tensile force of the insulating paper 1 are balanced, so that the stator core 5 has a plurality of electromagnetic steel sheets 5a assembled together. keep.

Here, the effect of making the surface of the electromagnetic steel sheet 5a a smooth surface (a surface having no unevenness for caulking) will be explained.

Conventionally used caulking, which connects laminated steel plates (electromagnetic steel plates) by plastically deforming uneven portions, causes the following problems.

Caulking plastically deforms unevenness by applying pressure load to close the gaps between adjacent laminated steel plates, but since steel plates have elastic deformation regions, when the pressure load is removed, minute gaps between the steel plates are formed. occurs. When molding a resin molded body directly onto such a stator core, resin injection pressure is applied to the surface of the steel plate in addition to the clamping force of the mold. Therefore, the laminated steel plates that have been deformed so that the gaps are collapsed by the clamping force of the mold are further deformed so that the gaps between the laminated steel plates are collapsed. This deformation of the laminated steel plate creates a gap between the mold and the laminated steel plate, and the injected resin leaks, causing molding burrs.

In order to reduce molding burrs, it is necessary to close the gaps between the laminated steel plates before resin injection to suppress deformation of the stator core due to resin injection pressure. For this purpose, it is necessary to increase the mold clamping force, which leads to an increase in the size of the mold and injection molding machine, which causes an increase in costs.

In addition, the caulking condition fluctuates due to deviations in the thickness of the laminated steel plates and wear of the mold, and large variations in the dimensions in the laminated direction and the load used to close the gaps between the laminated steel plates result in excessive mold clamping force. There is a fear.

Furthermore, when the coil is wound, the amount of deformation is different between the caulked area and the non-caulked area, so the stator core is likely to warp. When the stator core warps, a force in the direction of expansion and contraction is generated against the insulating paper, causing insulation failure such as damage to the joint between the resin bobbin and the insulating paper.

Furthermore, the uneven portions of the laminated steel plate and the plastically deformed portions due to caulking deteriorate the magnetic properties, leading to an increase in iron loss and a decrease in the efficiency of the rotating electric machine.

According to this embodiment, since the stator core 5 has a smooth contact surface (surface) between the electromagnetic steel plates 5a adjacent to each other in the lamination direction, it is possible to easily bring the adjacent laminated steel plates 5a into close contact. Since resin injection molding is performed with the laminated steel plates 5a in close contact with each other, the laminated steel plates 5a are less deformed due to injection pressure, and the occurrence of molding burrs can be suppressed. Further, the laminated steel plate 5a is compressed in the lamination direction by applying mold clamping force and resin injection pressure, and in this compressed state, resin bobbins 61 and 62 are molded at both ends of the stator core 5. At the same time, the molded resin bobbins 61 and 62 are connected by the insulating paper 1. Therefore, after injection molding, the restoring force of the laminated steel plate 5a (the restoring force that increases the length dimension in the stacking direction of the electromagnetic steel plates) is balanced with the tension of the insulating paper 1, so that the laminated steel plate 5a maintains a tightly attached state. can be retained. At this time, the contact surfaces (surfaces) of the electromagnetic steel sheets 5a adjacent to each other in the lamination direction are made smooth planes, and the restoring force is made equal on the inner and outer circumferential sides of the laminated surfaces of the electromagnetic steel sheets, so that the tension of the insulating paper is The adhesion state of the laminated steel plates can be stably maintained in a balanced state. Therefore, in the assembly work of the stator core 5 and the assembly work of the stator 100, workability does not deteriorate.

In addition, since the contact surfaces (surfaces) between the electromagnetic steel sheets 5a adjacent to each other in the stacking direction are smooth planes, the amount of deformation of the stator core does not vary depending on the location during winding of the coil, and the warpage of the stator core does not occur. can be suppressed. In order to suppress warpage of the stator core, it is effective to equalize the restoring force on the inner and outer circumferential sides of the laminated surface of the electromagnetic steel sheets. As a result, insulation defects such as damage to the insulating paper are prevented, and insulation reliability can be improved.

Furthermore, by eliminating caulking that plastically deforms the uneven portions, deterioration of the magnetic properties of the laminated steel plate 5a can be suppressed. Furthermore, since the laminated steel plates 5a are not bonded, it is easy to stabilize variations in laminated thickness due to thickness deviation of the laminated steel plates 5a by adjusting the number of laminated sheets, and injection molding conditions can be stabilized.

In this embodiment, the difference between the length L1 of the insulating paper 1 and the length L5 of the stator core 5 is sufficient to ensure the bonding strength between the length L1 of the insulating paper 1 and the stator core 5. It is necessary to ensure a suitable size. According to this embodiment, since the influence of gaps between the laminated steel plates 5a can be reduced, fluctuations in the joint portion 64 can be reduced and the area of the joint portion 64 can be ensured.

Further, when providing unevenness on the surface of the laminated steel plate, the single electromagnetic steel plate provided at one end of the stator core in the direction of the rotation axis needs to be a laminated steel plate without unevenness. This is to prevent the protrusion formed by the unevenness from protruding from one end surface of the stator core 5. When manufacturing a laminated steel plate by punching out a single plate-like member, it is necessary to combine a laminated steel plate with unevenness and a laminated steel plate without unevenness. When adjusting the laminated thickness variation due to plate thickness deviation of the laminated steel plates by adjusting the number of laminated sheets, the laminated steel plate with unevenness is removed between two laminated steel plates without unevenness, and the length dimension of the stator core 5 is It is necessary to adjust L5. Therefore, the process for adjusting the length L5 of the stator core 5 becomes complicated.

In the present invention, by smoothing the surface of the electromagnetic steel sheets 5a, all the electromagnetic steel sheets 5a to be laminated can have the same shape. Therefore, by preparing a laminated plate in which electromagnetic steel plates 5a punched from a single plate-shaped member are successively laminated in the order in which they are punched, and by extracting laminated steel plates of a predetermined length from the laminated plate, one stator core is formed. 5 can be constructed. The next stator core 5 can be constructed by continuously laminating the electromagnetic steel sheets 5a next to the last electromagnetic steel sheet 5a constituting the previous stator core 5. Thereby, the stator core 5 can be constructed without the need to remove the electromagnetic steel plate 5a, and the assembling work of the stator core 5 can be simplified.

FIG. 6 is a partial sectional view of the stator core 5 according to an embodiment of the present invention, showing a cross section perpendicular to the axial direction of the shaft 12.

The insulating paper 1 has sufficient lengths L1b and L1c to cover the concentrated winding coil 7 arranged on the side surface of the stator core 5 after the concentrated winding coil 7 is wound. That is, the folded portions 1a and 1b of the insulating paper 1 have sufficient lengths L1b and L1c to cover the side surface of the stator coil 7 opposite to the side surface of the stator core 5. By covering the concentrated winding coils 7 with the insulating paper 1 when assembling the stator 100, insulation between adjacent concentrated winding coils 7 can be maintained.

As explained above, according to this embodiment, the electromagnetic steel sheet 5a constituting the stator core 5 can be treated as an integral part without being fastened by caulking, which leads to deterioration of workability during assembly. Never. Furthermore, warpage of the stator core during coil winding can be suppressed, and insulation reliability can be improved. Moreover, eddy current loss can be reduced. Furthermore, by insulating the side surfaces of the stator core 5 in the rotational direction with the insulating paper 1, the insulating layer can be made thinner than when insulating with a general resin bobbin. Furthermore, it is possible to easily arrange the insulating paper 1 between adjacent concentrated winding coils 7, improve insulation reliability between adjacent coils, and reduce the gap between adjacent coils that forms an insulating layer. I can do it.

By reducing the insulating layer of the concentrated winding coil 7, more coils can be wound, reducing copper loss by reducing coil resistance, and improving rotating electrical machine characteristics by increasing the number of coil turns. . Furthermore, when installing the stator core 5 in the resin molding die, it becomes easy to change the number of stacked cores. By adjusting the number of electromagnetic steel plates 5a and installing them in the mold so that the length dimension L5 of the stator core 5 becomes an appropriate dimension according to the plate thickness deviation of the electromagnetic steel plates 5a and the dimensions of the mold. , stable resin molding can be performed.

Furthermore, according to this embodiment, since the adhesion of the laminated steel plates can be improved, the dimensional accuracy of the stator core in the axial direction can be improved, which has the advantage of reducing variations in motor characteristics. have Furthermore, improving the dimensional accuracy of the stator core allows for stable fixation of adjacent divided cores, which also has the advantage of improved reliability.

As described above, according to this embodiment, it is possible to improve the insulation reliability, reduce loss, and improve the characteristics of the rotating electrical machine RM without causing deterioration in workability. In this embodiment, there are no holes in the stator core 5, but even if there are holes for purposes such as positioning, it can be regarded as a smooth electromagnetic steel plate 5a as long as there are no convex parts on the electromagnetic steel plates 5a adjacent to each other in the stacking direction. , the same effects as in this embodiment can be obtained.

Further, in this embodiment, the cross-sectional area of the concentrated winding coil 7 is circular, but it may be rectangular. By forming the rectangular shape, the concentrated winding coil 7 can be wound with high density, so that the efficiency of the rotating electric machine RM is improved. Furthermore, in this embodiment, by employing the insulating paper 1 in a part of the bobbin 6, the thickness of the insulating part of the bobbin 6 is reduced, and the space factor of the stator coil (concentrated winding coil) 7 is improved. I can do it.

Note that the present invention is not limited to the above-described embodiments, and includes various modifications.
For example, the embodiments described above have been described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to all the configurations. Furthermore, it is possible to add, delete, or replace some of the configurations of the embodiments with other configurations.

DESCRIPTION OF SYMBOLS 1... Insulating paper, 2... Connection board, 3... Conductor, 5... Stator core, 6... Bobbin, 7... Concentrated winding coil (stator coil), 8... Concentrated winding stator core, 9... Housing, 51... Joint Iron part, 52a, 52b... Stator core end surface, 61... Resin bobbin on the wiring board side, 62... Resin bobbin on the opposite wiring board side, 70... Coil terminal, 91... Through hole, 100... Stator, 200... Rotor , 701... Winding start coil terminal, 702... Winding end coil terminal.

Claims (6)

A stator for a rotating electric machine, comprising a stator core made of a plurality of laminated electromagnetic steel plates, and a stator coil wound around the stator core with an insulator interposed therebetween,
The insulator includes a first bobbin portion and a second bobbin portion made of resin provided at both ends of the stator core in the rotational axis direction of the rotating electric machine, and a first bobbin portion and a second bobbin portion. an insulating sheet covering a side surface of the stator core around which the stator coil is wound ;
The electromagnetic steel sheet has a flat surface with a smooth contact surface with an adjacent electromagnetic steel sheet in the stacking direction ,
The first bobbin part and the second bobbin part are injection molded parts that are molded by placing the stator core in a resin mold and injecting resin while applying a clamping force. , the first bobbin part and the second bobbin part are connected to each other by the insulating sheet, and are bonded to the insulating sheet during resin injection molding;
In the stator core, the restoring force of the plurality of electromagnetic steel plates after injection molding of the first bobbin part and the second bobbin part is balanced with the tension of the insulating sheet, so that the plurality of electromagnetic steel plates are in close contact with each other. A stator of a rotating electrical machine that holds The stator for a rotating electric machine according to claim 1 , wherein the restoring force is equal on an inner circumferential side and an outer circumferential side of a laminated surface of the electromagnetic steel sheets. The insulating sheet has a central portion that covers a side surface of the stator core, and bent portions provided on both sides of the central portion in the radial direction of the stator,
The stator for a rotating electrical machine according to claim 1 , wherein the bent portion covers a side surface of the stator coil opposite to a side surface of the stator core. A rotating electric machine comprising: the stator according to claim 1; and a rotor disposed on the inner peripheral side of the stator with a gap therebetween. It has a stator core made of a plurality of laminated electromagnetic steel plates, and a stator coil wound around the stator core with an insulator interposed therebetween , and the insulator A first bobbin part and a second bobbin part made of resin are provided at both ends of the stator core , and the stator coil is wound between the first bobbin part and the second bobbin part. A method for assembling a stator of a rotating electric machine comprising: an insulating sheet covering a side surface of a child core;
The electromagnetic steel plates are composed of electromagnetic steel plates of the same shape in which the contact surfaces of adjacent electromagnetic steel plates in the stacking direction are smooth planes,
The electromagnetic steel plates are created by punching out a plate-like member, and the electromagnetic steel plates are successively laminated in the order in which they are punched to constitute one stator core, and the next stator core constitutes the previous stator core. Consisting of continuous lamination from the last electromagnetic steel plate to the next electromagnetic steel plate ,
The first bobbin part and the second bobbin part are molded by placing the stator core in a resin mold and injecting resin while applying mold clamping force, and by injection molding the resin. At times, the first bobbin portion and the second bobbin portion are connected by the insulating sheet, and are bonded to the insulating sheet;
The stator core is in a state in which the plurality of electromagnetic steel plates are in close contact with each other because the restoring force of the plurality of electromagnetic steel plates after injection molding of the first bobbin part and the second bobbin part is balanced with the tension of the insulating sheet. A method of assembling a stator of a rotating electrical machine held in The rotating electric machine according to claim 5 , characterized in that the electromagnetic steel plates are laminated so that the restoring force that increases the length dimension in the lamination direction of the electromagnetic steel plates is equal on the inner circumferential side and the outer circumferential side of the laminated surface. How to assemble the stator.

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