JP2008092735A - Stator structure of axial gap type rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an eddy current and improve stiffness to bending moment, in a stator structure molded. <P>SOLUTION: A plurality of cores 1 are arranged on a stator 12 of a rotary electric machine in a peripheral direction. A fin 9 which is a sheet type high-strength metal member is arranged between the cores 1, 1 adjoining each other in a peripheral direction so that it may face to a direction of a shaft O and to an axial direction, and may form right angles in the peripheral direction, over space from an end of an inside diametrical side to an end of an outside diametrical side of the stator 12, then these cores 1 and the fin 9 are molded with resin 5 to form the stator 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for increasing the rigidity of a stator of a molded rotating electrical machine.

  In a stator in which a plurality of cores are arranged in the circumferential direction, it is common to mold the stator by pouring resin between the cores and molding. FIG. 9 is a longitudinal cross-sectional view schematically showing only a half of a molded stator fractured on a plane including the rotation axis O in an axial gap type rotating electrical machine in which a rotor and a stator are arranged to face each other in the axial direction. FIG. 10 is a perspective view showing a state in which an armature coil is wound around one core shown in FIG. In the figure, 101 is a core, 102 is an armature coil, 103 is an insulator for insulation, 104 is a rotating electrical machine case, and 105 is a molded resin member.

Incidentally, during the operation of the rotary electric machine, the stator of the rotary electric machine as shown in FIG. 10, since the reaction force in the axial O direction F _z and the torque reaction force T _theta acts, with a solid rigid each core 101 Need to support. However, since the rigidity is low only with resin, techniques for molding a metal high-strength member have already been disclosed in Patent Documents 1 to 3. 11 and 13 are longitudinal sectional views schematically showing a half of the conventional stator structure disclosed in Patent Documents 1 to 3, with the surface including the rotation axis O broken. FIG. 12 is a perspective view showing a part of the stator structure. FIG. 14 is a partial front view of the stator structure as viewed from the direction of the rotation axis O. In the figure, 106 indicates a high-strength member extending in the radial direction, and 107 indicates a high-strength member extending in the circumferential direction.

  If the dimensional accuracy of the high-strength member varies, there is a concern that the core may rattle with respect to the rotating electrical machine case. It is also necessary to improve the efficiency of assembly work. Therefore, resin is poured and molded between the high-strength member 106 and the core 101, and between the high-strength member 106 and the rotating electrical machine case 104, as in the portion 105d and the portion 105e shown in FIG.

The molded resin 105 has low rigidity against tension but high rigidity against compression. In FIG. 14, when a torque reaction force _Tθ acts on the core 101, a circumferential compressive force is generated in the portions 105a, 105b, and 105c of the resin member 105. Therefore, the portions 105a, 105b, and 105c are Compete against compression as indicated by the arrows. In FIG. 11, when an axial reaction force F _z acts on the core 101, an axial compressive force is generated at the portion 105 e and the portion 105 f of the resin member 105. It counters against compressive stress as shown by. Therefore, by molding the high-strength member 106 on the stator, the rigidity can be increased with respect to the axial reaction force _Fz and the torque reaction force _Tθ .
JP 2000-52657 A JP 2003-88032 A JP 2004-282899 A

  However, in the stator structure based on the above-described conventional technique, the following problems occur. In other words, a metal member made of aluminum or stainless steel is generally used as the high-strength member, but an axial magnetic flux is linked to the high-strength members 106 and 107, and an eddy current is generated in the metal member. There is a problem that it ends up. FIG. 12 shows a state where eddy current is generated in a conventional stator structure by a two-dot chain line.

  Further, when the axial gap type rotating electrical machine is thinned by design and the radial dimension of the stator becomes larger than the axial dimension of the stator, the bending moment M as shown in FIG. 13 becomes so large that it cannot be ignored. When the moment M is applied, a tensile stress is applied at the portion 105e in FIG. 13, so that the resin member 105 is deformed and sufficient rigidity cannot be ensured.

  In view of the above-described circumstances, the present invention proposes a mold that prevents eddy current and has rigidity against bending moment.

For this purpose, the mold structure of the stator according to the invention is as described in claim 1,
In an axial gap type rotating electric machine in which a plurality of cores are arranged in a circumferential direction on a stator of a rotating electric machine, and a rotor rotatably supported on the stator is arranged so as to face the axial direction.
Between the cores adjacent in the circumferential direction, a plate-shaped high-strength metal member is formed in the axial direction and the radial direction from the inner diameter side end portion to the outer diameter side end portion of the stator, and is perpendicular to the circumferential direction. The core and the high-strength metal member are molded with a resin and are configured.

  According to the configuration of the present invention, since the high-strength metal member of the above claims is not perpendicular to the magnetic flux, eddy current can be prevented. Moreover, rigidity can be ensured with respect to a bending moment.

Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.
FIG. 1 is a perspective view schematically showing a part of a stator structure according to an embodiment of the present invention. This embodiment relates to an axial gap type rotating electrical machine. A plurality of cores 1 are arranged in the circumferential direction of the stator. An armature coil 2 is wound in the middle of the core 1 extending in the axial direction. From the armature coil 2, both ends of the core 1 protrude and widen like a bowl. The bowl-shaped core end portion 8 faces a rotor (not shown). A rotor (not shown) is rotatably supported in the rotating electric machine.

  As shown in FIG. 1, fins 9, which are plate-like high-strength metal members, are arranged between the cores 1 and 1 that are adjacent in the circumferential direction. The same number of fins 9 as the cores are arranged. The fins 9 extend in the axial direction and the radial direction of the rotating electrical machine and are orthogonal to the circumferential direction. And the stator support member 11 provided in the radial direction inner edge part of the stator is connected to the inner diameter direction end of the fin 9. A pipe 10 is coupled to the end of the fin 9 in the outer diameter direction. The pipe 10 is also made of the same metal member as the fin 9, for example, aluminum, aluminum alloy, stainless steel, or stainless steel alloy, and extends in the axial direction of the rotating electrical machine.

  A resin is poured between the core 1 and the fins 9 and molded. Then, one stator 12 is formed as a whole. FIG. 2 is a circumferential development view in which the stator 12 is broken by a cylindrical surface extending in the circumferential direction and a part thereof is developed. In FIG. 2, an insulator 3 that is an insulator is inserted between a metal core 1 and an armature coil 2 through which an alternating current flows. A resin member 5 is filled between the core structures 1 to 3 having the armature coil 2 and the insulator 3 and the fins 9. The fin 9 is a high-strength metal member having a much larger elastic coefficient than the resin member 5 in tensile stress and compressive stress, and is harder than the resin 5.

  The core 1 shown in FIGS. 1 and 2 has the same configuration as the core 101 shown in FIG. 10 described above in “Background Art”. In this embodiment, the armature coil 102 in FIG. 10 is replaced with the armature coil 2, and FIG. 10 is used.

  According to the present embodiment shown in FIGS. 1 and 2, since the magnetic flux of the magnetic circuit passing through the core 1 passes through the stator 12 in the axial direction, there is almost no magnetic flux interlinking with the plate-like fins 9. Therefore, the eddy current generated in the fin 9 can be effectively reduced.

  Further, in order to facilitate visual understanding, a description will be given with reference to FIG. 3 which is a perspective view in which the resin member 5 is omitted from the stator 12, and it is directed radially outward with the annular stator support member 11 as a fulcrum. Even if a bending moment M as indicated by a thick arrow having a large axial force acts on the stator 12, the fin 9 as a whole opposes the bending moment M, so that it is compared with the conventional stator structure shown in FIG. Thus, the rigidity against the bending moment can be increased.

  In addition, by flowing the coolant through the pipe 10, the fins 9 having excellent thermal conductivity such as an aluminum material can cool the stator 12 efficiently.

Next, another embodiment of the present invention will be described.
FIG. 4 is a developed circumferential view showing a stator structure according to another embodiment, with a cylindrical surface extending in the circumferential direction broken and a part thereof developed. In the present embodiment, the same members as those in the above-described embodiments will be denoted by the same reference numerals and the description thereof will be omitted, and different portions will be newly described by adding reference numerals.

In the embodiment shown in FIG. 4, a high-strength resin member 13 extending in the circumferential direction is coupled to the fin 9. The high strength resin member 13 is made of polyaminoamide resin or PPS (Polyphenylene Sulfide) resin having high strength and high heat resistance. The high-strength resin member 13 has a fan shape when viewed from the axial direction, and has a plate shape having a thickness in the axial direction. When viewed from the root of the high-strength resin member 13 coupled to the fins 9, the circumferential tip 13 s of the high-strength resin member 13 is interposed between the end 8 of the core 1 and the insulator 3 to support the core 1. . Or although the front-end | tip part 13s does not contact the core 1, as shown in FIG. 4, the high-strength resin member 13 is extended to the core 1 vicinity, and the high-strength resin member 13 is interposed between the edge part 8 and the insulator 3. As shown in FIG. It is inserted deep enough.
And the high strength resin member 13 is couple | bonded with the axial direction both ends of the fin 9, respectively.

  As a preferred embodiment of the root portion of the high-strength resin member 13, a plurality of holes 14 are provided in the fin 9 as shown in FIG. 5, and the high-strength resin member is provided on both surfaces of the fin 9 as shown in FIG. 13 root portions 13n are attached. Here, the axial thickness of the root portion 13 is made larger than the diameter of the hole 14, and the high-strength resin member 13 is penetrated through the hole 14 to be sufficiently joined to the fin 9. And the axial direction thickness of the front-end | tip part of the high intensity | strength resin member 13 is made smaller than the root part 13n.

  According to such another embodiment of the present invention, since the high-strength resin member 13 is not made of metal, there is an advantage that no eddy current is generated. Further, the rigidity of the molded stator 12 can be further increased.

  Although not shown in the drawing, the fins 9 may be provided with irregularities such as a so-called dimple shape instead of the plurality of holes 14. Also by this, the high-strength resin member 13 can be sufficiently bonded to the fins 9.

Next, still another embodiment of the present invention will be described.
FIG. 7 is a circumferential development view in which a stator structure according to still another embodiment is broken by a cylindrical surface extending in the circumferential direction and a part thereof is developed. Moreover, FIG. 8 is explanatory drawing which expands and shows the fin and high-strength resin member in the same figure. In the present embodiment, the same members as those in the above-described embodiments will be denoted by the same reference numerals and the description thereof will be omitted, and different portions will be newly described by adding reference numerals.

  7 and 8, the thickness of the base portion 13n of the high-strength resin member 13 is formed so as to change stepwise. By forming in this way, it is possible to ensure a distance (hereinafter referred to as creepage distance) measured along the surface of the high-strength resin member 13 from the core 1 and the armature coil 2 to the metal fin 9. The fin 9 can be reliably insulated from the armature coil 2.

  Further, since the thickness of the high strength 13 is formed so as to change stepwise and the surface 15 parallel to the fins 9 is provided at the root portion 13n, the armature coil 2 is seated on the surface 15 as shown in FIG. Thus, the fin 9 can be separated from the armature coil 2 by a distance C in the circumferential direction. Therefore, the fin 9 can be reliably insulated from the armature coil 2.

  7 and 8, the high-strength resin member 13 is shown only on one surface of the fin, and the high-strength resin member 13 is omitted on the other surface. Further, in order to obtain a further insulating performance, both surfaces of the fin 9 may be covered with the insulator 16.

By the way, according to each embodiment described above, a plurality of cores 1 are arranged in the circumferential direction on the stator 12 of the rotating electrical machine, and a plate-like high-strength metal member is interposed between the cores 1 and 1 adjacent in the circumferential direction. A certain fin 9 is arranged from the inner diameter side end portion of the stator 12 to the outer diameter side end portion so as to be parallel to the axial direction and the radial direction and perpendicular to the circumferential direction, and the core 1 and the fin 9 are made of resin 5. Because it was molded and configured,
It is possible to prevent the eddy current from being generated in the fin 9 and increase the axial reaction force acting on the core 1, the circumferential torque reaction force, and the rigidity against the bending moment M.

Further, according to the other embodiment described above, the fin 9 is integrally connected with the high-strength resin member 13 extending in the circumferential direction, and the circumferential tip 13s of the high-strength resin member 13 supports the core 1 or the core. Because it extends to the vicinity,
The rigidity of the molded stator 12 can be further increased without generating eddy current.

As shown in FIGS. 7 and 8, the axial thickness of the high-strength resin member 13 is changed from the front end portion 13 s of the high-strength resin member 13 toward the root portion 13 n of the high-strength resin member 13 coupled to the fin 9. , Because it was increased step by step,
It becomes possible to ensure the creepage distance of the root portion 13n, and to reliably insulate the fin 9 from the armature coil 2. Then, the fins 9 can be reliably insulated from the armature coil 2 by being separated from the armature coil 2 by a distance C in the circumferential direction.

  The above description is merely an example of the present invention, and the present invention can be variously modified without departing from the spirit of the present invention.

1 is a perspective view schematically showing a part of a stator structure according to an embodiment of the present invention. It is the circumferential direction expanded view which fractures | ruptures the stator of the Example in the cylindrical surface extended in the circumferential direction, and expands and shows the part. It is explanatory drawing which shows a mode that a bending moment acts on the stator of the Example. It is the circumferential direction expansion | deployment figure which fractures | ruptures the stator structure which becomes the other Example of this invention by the cylindrical surface extended in the circumferential direction, and expands and shows a part. It is a perspective view which extracts and shows a part of fin of the Example. It is a perspective view which shows typically the coupling | bond location with the fin and high-strength resin member of the Example. It is the circumferential direction expansion | deployment figure which fractures | ruptures the stator structure which becomes further another Example of this invention by the cylindrical surface extended in the circumferential direction, and expand | deploys one part. It is explanatory drawing which expands and partially shows the fin and high-strength resin member in the Example. It is a longitudinal cross-sectional view which fractures | ruptures and shows the molded stator which becomes a prior art example in the surface containing an axial direction. It is a perspective view which shows the state which wound the armature coil per one core represented to the figure. It is a longitudinal cross-sectional view which shows the state which fractured | ruptured the conventional stator structure in the surface containing the rotating shaft O typically. It is a perspective view which shows a part of conventional stator structure. It is a longitudinal cross-sectional view which shows the conventional stator structure typically. It is a front view which shows a part of state which looked at the conventional stator structure from the rotating shaft direction.

Explanation of symbols

1 Core 2 Armature Coil 3 Insulator 5 Resin Member 6 Hydraulic Booster 9 Fin (High Strength Metal Member)
DESCRIPTION OF SYMBOLS 10 Piping 11 Stator support member 12 Stator 13 High-strength resin member 16 Insulator

Claims (3)

In an axial gap type rotating electric machine in which a plurality of cores are arranged in a circumferential direction on a stator of a rotating electric machine, and a rotor rotatably supported on the stator is arranged so as to face the axial direction.
Between the cores adjacent in the circumferential direction, a plate-shaped high-strength metal member is formed in the axial direction and the radial direction from the inner diameter side end portion to the outer diameter side end portion of the stator, and is perpendicular to the circumferential direction. A stator structure for an axial gap type rotating electrical machine, wherein the core and the high-strength metal member are molded with resin. In the stator structure of the axial gap type rotating electrical machine according to claim 1,
The high-strength metal member is integrally bonded with a high-strength resin member extending in the circumferential direction, and the distal end in the circumferential direction of the high-strength resin member supports the core or extends to the vicinity of the core. A stator structure of an axial gap type rotating electrical machine. In the stator structure of the axial gap type rotating electrical machine according to claim 2,
An axial gap type rotation characterized in that the axial thickness of the high-strength resin member is increased stepwise from the circumferential tip toward the root of the high-strength resin member coupled to the high-strength metal member. Electric stator structure.

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