JP2010166751A - Core and rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core that keeps a gap evenly between a rotor and a stator, and also to provide a rotating electrical machine using the same. <P>SOLUTION: In a rotating electrical machine, the core is used in a rotor 5 and a stator 3 disposed opposite each other via a gap in the axis direction that is a direction of the rotating axis. The core used in the stator 3 is equipped with an iron core 31 and a holding member 30, wherein the iron core 31 is made by stacking a plurality of thin plates in parallel to the rotating axis while being wound around the rotating axis to have a first face 31a on the gap side of the rotating axis and a second face 31b on the opposite side from the gap, and the holding member 30 holds at least the second face 31b. The second face 31b of the iron core 31 and the holding member 30 are joined by welding via the holding member 30. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a core used for at least one of a rotor and a stator that are arranged to face each other with a gap in the axial direction that is the direction of the rotating shaft, and a rotating electrical machine that uses the core.

  Conventionally, a core used for at least one of a rotor and a stator arranged to face each other with a gap in the axial direction corresponding to the direction of the rotation axis is formed by winding a thin steel plate in a spiral shape. It is disclosed. For example, in Patent Document 1, an electromagnetic steel plate is wound into a roll to form a laminated core for a stator of an axial gap type motor.

JP 2004-357391 A

  In a conventional core used for a rotor or a stator, when an iron core in which a plurality of thin plates are laminated parallel to the rotation axis is held by a holding member on the opposite side of the gap, the lamination between the laminations of the thin plates and the iron core are held. In order to join the member by welding, it was necessary to perform the welding on the gap side surface. In this case, since the unevenness by welding is formed on the gap surface of the core, there is a problem that the gap width between the rotor and the stator cannot be kept uniform.

  In order to avoid the welding, it is also conceivable to use an adhesive for joining between laminated thin plates and joining the iron core and the holding member. However, for example, when a rotary electric machine is used in a hermetic compressor, since the core is disposed in the refrigerant atmosphere, it is not desirable to use an adhesive, and a heat resistance problem also occurs. In addition, although it is possible to join the laminated iron cores with rivets, there is a problem that the cost increases because another member is added or the work increases.

  Then, in the core which concerns on this invention, and a rotary electric machine using the same, the core which can maintain the gap width of a rotor and a stator uniformly while employ | adopting welding, and a rotary electric machine using the same are provided. With the goal. For example, the rotating electrical machine is suitable for use in a hermetic compressor.

  In order to solve the above-described problem, the core of the present invention is used in at least one of a rotor and a stator that are arranged to face each other with a gap in the axial direction that is the direction of the rotating shaft in a rotating electrical machine. The core is wound around a rotation axis, a plurality of thin plates are stacked in parallel to the rotation axis, presents a first surface on the gap side of the rotation shaft, and an iron core presents a second surface on the opposite side of the gap; A holding member that holds at least the second surface. The second surface of the iron core and the holding member are joined by welding via the holding member.

  The holding member may have a first hole in a portion to be welded to the second surface of the iron core.

  Further, the first hole may be provided at a position including a welding position between the thin plates on which the iron cores are stacked.

  Further, the welding between the holding member and the iron core in the first hole and the welding between the laminated thin plates of the iron core may be continued.

  Further, the first hole may have a shape that is shifted from the radial direction with respect to the rotation axis at its own position and that extends from the inner diameter to the outer diameter of the holding member.

  A plurality of first holes are provided, and a radial position with respect to the rotation axis at the position of the first first hole may be different from a radial position with respect to the rotation axis at the position of the second second hole. .

  The holding member may have a second hole at a position different from the first hole and at a welding position between the thin plates on which the iron cores are stacked.

  Moreover, the holding member may have a thin part in the part welded with the 2nd surface of an iron core.

  Moreover, a thin part may be provided in the position containing the welding position between the thin plates with which the iron core was laminated | stacked.

  Welding between the holding member and the iron core in the thin part and welding between the laminated thin plates of the iron core may also be used.

  Further, the welding may be laser welding.

  In order to solve the above-described problems, a rotating electrical machine according to the present invention includes a first rotor having the core described above, a stator that is opposed to the first rotor with a gap in the axial direction, and an axial direction. A second rotor that is disposed opposite to the stator at a position opposite to the first rotor with another gap therebetween, has a magnetic field generation unit, and is coupled to the first rotor in the axial direction. .

  In order to solve the above problems, a rotating electrical machine according to another invention includes a first stator having the above-described core, a rotor disposed opposite to the first stator with a gap in the axial direction, and an axial direction. , And a second stator having a magnetic field generation unit disposed opposite to the rotor at a position opposite to the first stator with another gap therebetween.

  According to this core, since the iron core is welded to the holding member on the second surface, it is not necessary to weld on the first surface side, and the gap width between the rotor and the stator arranged opposite to each other is made uniform. be able to.

  Moreover, the 2nd surface of an iron core and a holding member can be easily welded using a 1st hole.

  Moreover, between the thin plates on which the iron cores are stacked can be easily welded using the first hole.

  Moreover, using the first hole, the welding between the holding member and the iron core and the welding between the thin plates on which the iron cores are laminated can be simultaneously performed, and the manufacturing cost can be reduced.

  Moreover, the strength of the iron core can be improved by welding the thin plates on which the iron cores are stacked in a range longer than the diameter of the holding member by using the first hole.

  Moreover, the strength of the iron core can be improved by welding the thin plates on which the iron cores are laminated in a wider range in the circumferential direction of the holding member using the first hole.

  Moreover, between the thin plates on which the iron cores are stacked can be easily welded using the second hole.

  Moreover, by using the thin portion as a welding location, the second surface of the iron core, the holding member, and the thin plate on which the iron core is laminated can be simultaneously and easily welded.

  In addition, the welding between the holding member and the iron core and the welding between the thin plates on which the iron cores are laminated can be easily performed by using laser welding with a small amount of heat input and with minimal rise of the welded portion. Moreover, if there is no hole and it is a thin part, the second surface of the iron core and the holding member can be easily welded by penetrating the laser.

  In addition, since the gap width between the first rotor and the stator arranged opposite to each other can be made uniform, a rotating electrical machine capable of stable operation can be realized.

  In addition, since the gap width between the first stator and the rotor arranged opposite to each other can be made uniform, a rotating electrical machine capable of stable operation can be realized.

It is sectional drawing of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is sectional drawing of the modification of the rotary electric machine which concerns on Embodiment 1 of this invention. It is sectional drawing of the modification of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 5 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 6 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 7 of this invention. It is a figure for demonstrating the 2nd stator of the rotary electric machine which concerns on Embodiment 8 of this invention.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of the rotating electrical machine according to the present embodiment. The rotating electrical machine shown in FIG. 1 is an axial gap type motor. The rotating electrical machine shown in FIG. 1 has a rotor (hereinafter also referred to as a “rotor”) 2 fixed to a shaft 4 (in many cases, the shaft extends in the direction of the rotational axis) that rotates about a rotational axis K. A first stator (hereinafter also referred to as “first stator” 1) and a second stator (hereinafter also referred to as “second stator”) 3 via air gaps from one side and the other side in the axial direction, which is the direction of the shaft. The shaft 4 penetrates through the central portion of the second stator 3, but the shaft 4 does not penetrate through the central portion of the first stator 1. In the present invention, the first stator 1 The shaft 4 may penetrate through the central portion of the stator 1.

  The first stator 1 includes a back yoke 10, a tooth 11 standing on the rotor 2 side of the back yoke 10, and a coil 12 wound around the tooth 11. The second stator 3 is constituted by a core that is wound around the rotation axis K and includes an iron core 31 in which a plurality of thin plates are stacked in parallel to the rotation axis K, and a holding member 30 that holds the iron core 31. ing. More specifically, the iron core 31 is a wound iron core obtained by winding a thin strip-shaped steel plate like Baumkuchen. Of course, rectangular steel plates laminated in the radial direction may be formed by joining a plurality of shapes in a plane perpendicular to the axis to a trapezoidal shape. The iron core 31 presents a first surface 31a on the gap side and a second surface 31b on the side opposite to the gap. The iron core 31 and the holding member 30 are joined by welding through a hole 32 provided in the holding member 30 on the second surface 31b side. Note that the back yoke 10 has a disk shape. The coil 12 is a three-phase coil.

  In the rotating electrical machine according to the present embodiment, the description will be continued assuming that only the first stator 1 has the coil 12, but the rotating electrical machine according to the present invention is not limited to this. The first stator 1 and the second stator 3 may have a coil. In addition, when providing the teeth which wind a coil in the 2nd stator 3, the said teeth may be integral with the iron core 31, and are good also as a different body. In addition, when providing the teeth and the iron core 31 integrally, the thin plate which comprises the iron core 31 is convex shape in the rotating shaft K direction in the position corresponding to the teeth. Therefore, by winding the thin plate around the rotation axis K, teeth that are convex in the direction of the rotation axis K are formed integrally with the iron core 31. Further, the number of phases of the coil is not limited to three. Furthermore, as shown in FIG. 1, when the bottom surface of the first stator is not welded to the holding member, if the second stator 3 is welded to the holding member on the second surface of the iron core, the thickness of the iron core in the axial direction. It is desirable that the stator to be welded to the holding member on the second surface of the iron core is thicker. This is because the influence of deterioration of the magnetic properties due to welding is taken into consideration.

  Next, the rotor 2 of the rotating electrical machine according to the present embodiment is arranged at a position facing the first stator 1 and the second stator 3, and the magnetic plate 21 and the magnet 22 stacked in the axial direction are connected to the frame 20. Is holding in. The magnet 22 has a first magnetic pole surface and a second magnetic pole surface that have different polarities on both sides in the axial direction. For example, the first magnetic pole surface exhibits an N pole, and the second magnetic pole surface exhibits an S pole.

  As the magnet 22, it is desirable to employ a sintered rare earth magnet in order to increase the magnetic flux density. In this case, rare earth magnets, particularly sintered magnets, have high conductivity, and eddy current loss due to the armature magnetic field is likely to occur. Therefore, by using a magnetic material having a lower conductivity than that of the rare earth magnet for the magnetic plate 21, the generation of eddy current loss can be suppressed. By adopting a magnetic core having a magnetically isotropic magnetic core for the magnetic plate 21, in particular, by adopting a powder iron core, eddy current loss can hardly occur in the magnetic plate 21. In the configuration shown in FIG. 1, since the armature magnetic field is generated from the first stator 1 having the coil 12, the magnetic plate 21 is preferably provided on the first stator 1 side.

  Furthermore, the structure of the 2nd stator 3 is demonstrated based on FIG. FIG. 2A is a perspective view of the second stator 3 as viewed from the first surface 31 a side of the iron core 31. FIG. 2B is a perspective view of the second stator 3 as viewed from the second surface 31 b side of the iron core 31. FIG. 2C is a plan view of the second stator 3 viewed from the second surface 31 b side of the iron core 31. As shown in FIGS. 2A and 2B, the second stator 3 has a configuration in which the holding member 30 holds the iron core 31 from three directions of the inner diameter, the outer diameter, and the bottom surface. Therefore, the holding member 30 includes an inner diameter side wall 30b, an outer diameter side wall 30a, and a bottom plate 30c. The holding member 30 has a hole 32 in the bottom plate 30c. The holes 32 are provided radially in the radial direction with respect to the rotation axis K of the holding member 30. The shaft 4 passes through the hole 33 provided at the center of the holding member 30.

  The shape of the holding member 30 is not limited to the shape shown in FIG. 2, and various shapes are conceivable depending on the presence / absence of the inner diameter side wall 30b and the outer diameter side wall 30a. Specifically, an example of variations in the shape of the holding member 30 is shown in FIG. FIG. 3 is a cross-sectional view when the holding member 30 is cut at the position of the AA plane in FIG. In addition, the hole 32 does not appear in the position of AA surface.

  The cross-sectional view of the AA plane in FIG. 2A corresponds to FIG. That is, the holding member 30 shown in FIG. 3A includes a bottom plate 30c, an outer diameter side wall 30a provided on the outer diameter side surface of the iron core 31, and an inner diameter side provided on the inner diameter side surface of the iron core 31. Wall 30b. Therefore, the holding member 30 shown in FIG. 3A holds the iron core 31 with the inner diameter side wall 30b, the outer diameter side wall 30a, and the bottom plate 30c. For example, the walls 30a and 30b and the bottom plate 30c are continuous.

  As a variation of the holding member 30, in FIG. 3B, the outer diameter side wall 30a and the inner diameter side wall 30b are not provided. Therefore, the holding member 30 shown in FIG. 3B holds the iron core 31 only by the bottom plate 30c.

  Further, in the holding member 30 shown in FIG. 3C, the outer diameter side wall 30a is provided without providing the inner diameter side wall 30b. Therefore, the holding member 30 shown in FIG. 3C holds the iron core 31 by the outer diameter side wall 30a and the bottom plate 30c. In addition, in the holding member 30 shown in FIG. 3D, a wall 30a on the outer diameter side is provided on the side opposite to the iron core 31 in the axial direction with respect to the bottom plate 30c. Therefore, the holding member 30 shown in FIG. 3D holds the iron core 31 only by the bottom plate 30c. Further, in the holding member 30 shown in FIG. 3E, an outer diameter side wall 30a is provided on the outer diameter side of the bottom plate 30c, the wall 30a is in contact with at least a part of the outer surface 31c of the iron core 31, and is axially In this case, it extends to the opposite side of the part. Therefore, the holding member 30 shown in FIG. 3E holds the iron core 31 with the outer diameter side wall 30a and the bottom plate 30c.

  Further, in the holding member 30 shown in FIG. 3F, the inner diameter side wall 30b is provided without providing the outer diameter side wall 30a. Therefore, the holding member 30 shown in FIG. 3F holds the iron core 31 with the inner diameter side wall 30b and the bottom plate 30c. Further, in the holding member 30 shown in FIG. 3G, an inner diameter side wall 30b is provided on the side opposite to the iron core 31 in the axial direction with respect to the bottom plate 30c. Therefore, the holding member 30 shown in FIG. 3 (g) holds the iron core 31 only by the bottom plate 30c. In addition, in the holding member 30 shown in FIG. 3 (h), an inner diameter side wall 30b is provided on the inner diameter side of the bottom plate 30c, and the wall 30a is in contact with at least a part of the inner side surface 31d of the iron core 31, and in the axial direction. It extends to the opposite side of the part. Therefore, the holding member 30 shown in FIG. 3 (h) holds the iron core 31 with the inner diameter side wall 30b and the bottom plate 30c. In addition, as a variation of the holding member 30, in addition to FIGS. 3A to 3H, a combination of the configurations of FIGS. 3C to 3H may be used.

  The holding member 30 has a rib structure as long as it has at least one of the outer diameter side wall 30a and the inner diameter side wall 30b as shown in FIGS. 3 (a), 3 (c) to 3 (h). Thus, the strength is improved. In addition, when the holding member 30 is not provided with the walls 30a and 30b in contact with the iron core 31 as shown in FIGS. 3B, 3D, and 3G, the vortex flowing from the iron core 31 to the holding member 30 Current can be reduced. In addition, if the walls 30a and 30b of the holding member 30 are at least retracted from the first surface 31a of the iron core 31 toward the second surface 31b, an eddy current flowing from the first surface 31a of the iron core 31 to the holding member 30 is generated. Can be reduced.

  Furthermore, if the holding member 30 is provided with at least the outer diameter side wall 30a as shown in FIGS. 3A and 3C to 3E, the contact area with the outer frame frame of the rotating electrical machine. Becomes larger and the second stator 3 can be easily held. Further, if the holding member 30 includes at least the inner diameter side wall 30b as shown in FIGS. 3 (a), 3 (f) to 3 (h), the strength of the inner diameter of the second stator 3 is increased. The second stator 3 can be easily held by holding the inner diameter side wall 30b.

  Next, the joining of the iron core 31 and the holding member 30 will be described. As shown in FIG. 2B, the holding member 30 has a hole 32 in the bottom plate 30c. The second surface 31 b of the iron core 31 can be confirmed from the bottom plate 30 c side of the holding member 30 through the hole 32. Therefore, in the second stator 3 according to the present embodiment, the iron core 31 and the holding member 30 are joined by welding using this hole 32. Specifically, as shown in FIG. 2 (c), the part 32 to be welded is laser-welded on the side 32a of the hole 32 parallel to the radial direction of the second stator 3. If the side 32a is welded, at least a part between the laminated cores 31 can be welded simultaneously with the welding of the iron core 31 and the holding member 30. Therefore, if the side 32a is welded, the welding work process at the time of manufacture can be reduced. In particular, when the hole 32 exposes both ends (the outer diameter side end and the inner diameter side end) of the second surface 31b in the radial direction, the side 32 is welded between the both ends, and the lamination of the iron cores 31 is performed. Is desirable in that it can be welded over the entire radial direction. In FIG. 2 (c), the welding location is applied only to one hole 32, but it is actually desirable to perform similar welding on all the holes 32.

  As another welding location, as shown in FIG. 2C, the side 32b of the hole 32 parallel to the circumferential direction of the second stator 3 is laser-welded. In FIG. 2C, a portion between the laminated cores 31 is welded on a straight line 32 c connecting a portion where the inner diameter side 32 b is welded and a portion where the outer diameter side 32 b is welded. It is also possible to weld the welded part of the straight line 32c and the welded part of the side 32b continuously and simultaneously. In this case, the work process at the time of manufacture can be reduced.

  In the above example, it has been described that laser welding is used as the welding method. However, the present invention is not limited to this, and welding using a filler rod (for example, TIG welding) may be used. When laser welding is performed, since heat input is small, the distortion of the iron core 31 is small, and the influence on the magnetic characteristics can be reduced. In the present embodiment, in order to weld the iron core 31 and the holding member 30, a material that can be welded to the iron core 31 is used for the holding member 30. Specifically, as the holding member 30, a material that can be welded to the iron core 31, such as iron or stainless steel, can be considered. In particular, when stainless steel is used for the holding member 30, it is optimal to make it by sintering. In addition, when stainless steel is used for the holding member 30, non-magnetic material can be used to reduce magnetic flux leakage and reduce overcurrent due to leakage magnetic flux. Further, when the holding member 30 is formed of iron, it may be made of a casting or drawn. Further, when the varnish treatment is performed on the iron core 31, it may be performed after performing only welding between the laminated iron cores 31 or after performing all welding including welding of the iron core 31 and the holding member 30.

  As described above, since the second stator 3 (core) according to the present embodiment welds and joins the iron core 31 and the holding member 30 with the second surface 31b, welding is performed on the first surface 31a of the iron core 31. This is unnecessary, and the gap between the first surface 31a and the rotor 2 can be made uniform. In addition, as shown in FIG. 1, the eddy current which generate | occur | produces in the holding member 30 can also be reduced by making the holding member 30 not oppose the magnet 22 of the rotor 2 in an axial direction. Furthermore, as shown in FIG. 2B, the holding member 30 may be provided with a rib 300 or a rib 301 on the bottom plate 30c in order to compensate for the strength reduction caused by providing the hole 32. The rib 300 is provided between the adjacent holes 32 and in the radial direction with respect to the rotation axis. On the other hand, the rib 301 is provided in the periphery of the hole 32. The ribs 300 and 301 are examples, and are not limited to the shapes. The ribs are provided only at one location, but in reality, it is desirable to provide a plurality of similar ribs over the entire circumference.

  In addition, since the second stator 3 (core) according to the present embodiment uses welding for joining the iron core 31 and the holding member 30 and joining between the laminated cores 31, a case where an adhesive is used is used. Can be used in a refrigerant atmosphere, and is suitable for a rotary electric machine of a hermetic compressor.

  Further, the holding member 30 of the second stator 3 according to the present embodiment may be used as an outer frame frame like the rotating electrical machine shown in FIG. The rotating electrical machine shown in FIG. 4 is configured to cover the first stator 1 and the rotor 2 with the outer frame frames 100 and 101 and the holding member 30.

  Moreover, in the rotary electric machine shown in FIG. 1, the example which uses the core which welded the 2nd surface 31b of the iron core 31 and the holding member 30 as a stator was demonstrated. However, the present invention is not limited to this, and a configuration of a rotating electrical machine that uses the core as a rotor may be used. Specifically, the rotating electrical machine shown in FIG. 5 can be considered. The rotary electric machine shown in FIG. 5 is a first rotor (hereinafter also referred to as “first rotor”) fixed to a shaft 8 (in many cases, the shaft extends in the direction of the rotation axis) that rotates about a rotation axis K. 5 and a second rotor (hereinafter also referred to as “second rotor”) 7 are arranged in a state of sandwiching a stator (hereinafter also referred to as “stator”) 6 via an air gap. The shaft 8 passes through the central portion of the stator 6. The first rotor 5 is constituted by a core that is wound around a rotation axis K and includes an iron core 51 in which a plurality of thin plates are stacked in parallel to the rotation axis K, and a holding member 50 that holds the iron core 51. . The iron core 51 presents a first surface 51a on the gap side and a second surface 51b on the opposite side to the gap. The joining of the iron core 51 and the holding member 50 is performed by welding through the hole 52 provided in the holding member 50 on the second surface 51b side. The detailed configuration of the first rotor 5 is the same as that of the second stator 3 shown in FIG. Therefore, the second stator 3 shown in FIG. 2 can be regarded as the first rotor 5 by replacing the component numbers as follows. The holding member 30 is read as the holding member 50, the iron core 31 is read as the iron core 51, and the holes 32 and 33 are read as holes 52 and 53, respectively. Further, the walls 30 a and 30 b of the holding member 30 are read as the walls 50 a and 50 b of the holding member 50, and the bottom plate 30 c of the holding member 30 is read as the bottom plate 50 c of the holding member 50. Further, the first surface 31 a of the iron core 31 is read as the first surface 51 a of the iron core 51, and the second surface 31 b of the iron core 31 is read as the second surface 51 b of the iron core 51.

  The stator 6 has a tooth 60 and a coil 61 wound around the tooth 60. The second rotor 7 includes a yoke 71 in which thin plates are stacked, a magnet 72 that is stacked on the yoke 71 in the axial direction, and a holding member 70 that holds the yoke 71 and the magnet 72. For the reasons already described, it is desirable that the magnet 72 is further provided with a magnetic plate for reducing eddy current loss on the side opposite to the yoke 71. The second rotor 7 may use a coil instead of the magnet 72. When a coil is used for the second rotor 7, a portion around which the coil is wound may be formed integrally with the yoke 71. When the coil winding portion and the iron core 31 are provided integrally, the thin plate constituting the iron core 31 has a convex shape in the direction of the rotation axis K at a position corresponding to the coil winding portion. Therefore, by winding the thin plate around the rotation axis K, a portion for winding a convex coil in the direction of the rotation axis K is formed integrally with the iron core 31.

(Embodiment 2)
In the present embodiment, another second stator 3 and first rotor 5 that can be employed in the rotating electrical machine shown in FIGS. 1 and 5 will be described. FIG. 6A is a perspective view of the second stator 3 and the first rotor 5 according to the present embodiment as viewed from the second surface 31 b side of the iron core 31. FIG. 6B shows a cross-sectional view of the second stator 3 and the first rotor 5 according to the present embodiment cut along the A′-A ′ plane of FIG. In the following description, the second stator 3 will be described, but the configuration of the first rotor 5 is the same as that of the second stator 3 shown in FIGS. 6 (a) and 6 (b). Therefore, the second stator 3 shown in FIGS. 6A and 6B can be regarded as the first rotor 5 by replacing the component numbers as follows. Accordingly, detailed description of the configuration of the first rotor 5 is omitted. The holding member 30 is the holding member 50, the thin portion 30c1 is the thin portion 50c1, the welded portion 30c2 is the welded portion 50c2, the iron core 31 is the iron core 51, and the holes 32 and 33 are the holes 52 and 53. The groove 34 is replaced with the groove 54, respectively. Further, the walls 30 a and 30 b of the holding member 30 are read as the walls 50 a and 50 b of the holding member 50, and the bottom plate 30 c of the holding member 30 is read as the bottom plate 50 c of the holding member 50.

  Unlike the second stator 3 shown in FIG. 2, the second stator 3 shown in FIG. 6A is provided with a groove 34 instead of the hole 32 in the bottom plate 30 c of the holding member 30. The grooves 34 are also provided radially in the radial direction with respect to the rotating shaft 4 of the holding member 30. And the baseplate 30c in the position of the groove | channel 34 is the thin part 30c1, and the iron core 31 is closely_contact | adhered with the thin part 30c1 of the groove | channel 34 as shown in FIG.6 (b). Therefore, laser welding of the iron core 31 and the holding member 30 is possible from the bottom plate 30c side of the holding member 30 via the thin portion 30c1.

  As shown in FIG. 6A, when the groove 34 having the thin portion 30c1 is provided instead of providing the hole 32 in the holding member 30, there is an advantage that the place where the iron core 31 and the holding member 30 are welded is increased. That is, in the holding member 30 employing the hole 32 shown in FIG. 2, the iron core 31 and the holding member 30 can be welded only at the boundary portion between the hole 32 and the iron core 31. However, in the holding member 30 that employs the groove 34 having the thin portion 30c1 shown in FIG. 6, the iron core 31 and the holding member 30 can be welded at any position as long as the thin portion 30c1 is used. Welding with the member 30 can be performed simultaneously. For example, the welding may be performed in a straight line from the innermost circumference of the iron core 31 toward the outermost circumference in the radial direction. FIG. 6B shows a portion 30c2 in which the thin portion 30c1 is melted by laser light and welded to the iron core 31. In FIG. 6, the laser beam is scanned from the innermost circumference toward the outermost circumference, thereby performing welding between the iron core 31 and the holding member 30 and welding between the thin plates on which the iron core 31 is laminated. Can be done simultaneously.

(Embodiment 3)
In the present embodiment, another second stator 3 and first rotor 5 that can be employed in the rotating electrical machine shown in FIGS. 1 and 5 will be described. FIG. 7A is a perspective view of the second stator 3 and the first rotor 5 according to the present embodiment as viewed from the second surfaces 31b and 51b side of the iron cores 31 and 51. FIG. FIG. 7B is a plan view of the second stator 3 and the first rotor 5 according to the present embodiment as viewed from the second surfaces 31b and 51b side of the iron cores 31 and 51. FIG. FIG. 7C is a cross-sectional view of the second stator 3 and the first rotor 5 according to the present embodiment cut along the BB plane of FIG. In the following description, the second stator 3 will be described, but the configuration of the first rotor 5 is the same as that of the second stator 3 shown in FIGS. Therefore, the second stator 3 shown in FIGS. 7A to 7C can be regarded as the first rotor 5 by replacing the component numbers as follows. Accordingly, detailed description of the configuration of the first rotor 5 is omitted. The holding member 30 is read as the holding member 50, the iron core 31 is read as the iron core 51, and the holes 32 and 33 are read as holes 52 and 53, respectively. Further, the walls 30 a and 30 b of the holding member 30 are the walls 50 a and 50 b of the holding member 50, the bottom plate 30 c of the holding member 30 is the bottom plate 50 c of the holding member 50, and the step surface 30 d of the holding member 30 is the step surface of the holding member 50. In 30d, the boundary portion 30e of the holding member 30 is replaced with the boundary portion 50e of the holding member 50, respectively. Further, the second surface 31 b of the iron core 31 is read as the second surface 51 b of the iron core 51, respectively.

  The second stator 3 shown in FIG. 7A is different from the second stator 3 shown in FIG. 2 in that the radial length of the hole 32 provided in the bottom plate 30c of the holding member 30 is the radial width of the iron core 31. Longer. Therefore, the hole 32 of the holding member 30 in FIG. 7A has a step surface 30d that falls from the bottom plate 30c toward the second surface 31b of the iron core 31. FIG. 7C illustrates a case where the step surface 30d and the second surface 31b of the iron core 31 are the same surface.

  Thus, when the holding member 30 has the level | step difference surface 30d of the same surface as the 2nd surface 31b of the iron core 31, when welding the iron core 31 and the holding member 30, it shows to FIG.7 (b). Welding is possible at the boundary portion 30e between the second surface 31b of the iron core 31 and the step surface 30d. In FIG.7 (b), the location welded in the boundary part 30e is illustrated as the welding location 30e1. In the holding member 30 shown in FIG. 2, since the boundary portion between the hole 32 and the iron core 31 is welded, it is necessary to weld a portion that is substantially perpendicular. However, since the holding member 30 shown in FIG. 7 can weld the iron core 31 and the stepped surface 30d on the same surface, there is a merit that the welding work is facilitated. In the second stator 3 according to the present embodiment, the welding between the laminated cores 31 can be performed using the holes 32. In FIG.7 (b), the location which welded between the lamination | stacking of the iron core 31 is shown in figure as the welding location 30e2. In FIG. 7, the case where the second surface 31b and the stepped surface 30d of the iron core 31 are located on the same surface has been described in consideration of the ease of welding work, but the present invention is not limited to this. Absent. That is, the case where the 2nd surface 31b of the iron core 31 and the level | step difference surface 30d are not located in the same surface may be sufficient. In FIG. 7B, the welding location is applied only to one 0 hole 32, but actually, it is desirable to perform similar welding for all the holes 32.

(Embodiment 4)
In the present embodiment, another second stator 3 and first rotor 5 that can be employed in the rotating electrical machine shown in FIGS. 1 and 5 will be described. FIG. 8 is a perspective view of the second stator 3 and the first rotor 5 according to the present embodiment as viewed from the second surfaces 31b and 51b side of the iron cores 31 and 51. FIG. In the following description, the second stator 3 will be described, but the configuration of the first rotor 5 is the same as that of the second stator 3 shown in FIG. Therefore, the second stator 3 shown in FIG. 8 can be regarded as the first rotor 5 by replacing the component numbers as follows. Accordingly, detailed description of the configuration of the first rotor 5 is omitted. The holding member 30 is read as the holding member 50, the iron core 31 is read as the iron core 51, and the holes 32 and 33 are read as holes 52 and 53, respectively. Further, the walls 30 a and 30 b of the holding member 30 are the walls 50 a and 50 b of the holding member 50, the bottom plate 30 c of the holding member 30 is the bottom plate 50 c of the holding member 50, and the step surface 30 d of the holding member 30 is the step surface of the holding member 50. Read 30d respectively. Further, the second surface 31 b of the iron core 31 is read as the second surface 51 b of the iron core 51, respectively.

  The second stator 3 shown in FIG. 8 is different from the second stator 3 shown in FIG. 2 in a direction in which the hole 32 provided in the bottom plate 30c of the holding member 30 is deviated from the radial direction with respect to the rotation axis at its own position. The holding member 30 has a shape extending from the inner diameter to the outer diameter. The shape of the hole 32 shown in FIG. 8 has the merit of increasing the distance at which the layers of the iron core 31 on which a plurality of thin plates are laminated can be welded. By increasing the area where the layers of the iron core 31 can be welded, the strength of the iron core 31 is increased. Moreover, when welding is all performed in the radial direction with respect to the rotating shaft, a portion where the magnetic characteristics due to welding are deteriorated is concentrated at a specific position in the circumferential direction. When inclined in the circumferential direction as in the present embodiment, a portion deteriorated by welding always exists in the magnetic path passing through the second stator 3 regardless of the position of the rotor. Rotation unevenness and magnetic flux distribution unevenness due to the above are reduced. In that sense, as shown in FIG. 8, one outermost circumference and the other innermost circumference of the adjacent holes 32 are preferably on the same radial line. Also in the holding member 30 shown in FIG. 8, the hole 32 has a step surface 30 d located on the same plane as the second surface 31 b of the iron core 31. Therefore, also in the holding member 30 shown in FIG. 8, the iron core 31 and the step surface 30d on the same surface are welded.

(Embodiment 5)
In the present embodiment, another second stator 3 and first rotor 5 that can be employed in the rotating electrical machine shown in FIGS. 1 and 5 will be described. FIG. 9 is a perspective view of the second stator 3 and the first rotor 5 according to the present embodiment as viewed from the second surfaces 31b and 51b side of the iron cores 31 and 51. FIG. In the following description, the second stator 3 will be described, but the configuration of the first rotor 5 is the same as that of the second stator 3 shown in FIG. Therefore, the second stator 3 shown in FIG. 9 can be regarded as the first rotor 5 by replacing the component numbers as follows. Accordingly, detailed description of the configuration of the first rotor 5 is omitted. The holding member 30 is read as the holding member 50, the iron core 31 is read as the iron core 51, and the holes 32, 32a, 32b, and 33 are read as holes 52, 52a, 52b, and 53, respectively. Further, the bottom plate 30 c of the holding member 30 is read as the bottom plate 50 c of the holding member 50, and the step surface 30 d of the holding member 30 is read as the step surface 30 d of the holding member 50. Further, the second surface 31 b of the iron core 31 is read as the second surface 51 b of the iron core 51, respectively. About the 1st rotor 5, the code | symbol is attached | subjected to FIG. 9, and detailed description is abbreviate | omitted.

  Unlike the second stator 3 shown in FIG. 2, the second stator 3 shown in FIG. 9 has a hole 32 provided in the bottom plate 30 c of the holding member 30 on the inner diameter side of a hole 32 a provided in the outer diameter of the holding member 30. And a hole 32b to be provided. When the lengths in the radial direction of one hole 32a and one hole 32b are combined, the length is longer than the length from the inner diameter to the outer diameter of the holding member 30. The shape of the hole 32 shown in FIG. 9 has an advantage that welding between the layers of the iron core 31 and welding of the iron core 31 and the holding member 30 can be performed in a circumferential direction. By dispersing the welding locations, the bonding strength between the iron core 31 and the holding member 30 and the bonding strength between the layers of the iron core 31 are increased. In the holding member 30 shown in FIG. 9 as well, the hole 32 has a step surface 30 d located on the same plane as the second surface 31 b of the iron core 31. Therefore, also in the holding member 30 shown in FIG. 9, the iron core 31 and the step surface 30d on the same surface are welded.

  The number of holes 32 in the holding member 30 is preferably equal to or greater than the number of poles of the field magnet. If the number of holes 32 in the holding member 30 is equal to or greater than the number of poles, the iron core 31 is welded in the holes 32, so that deformation of the holding member 30 can be suppressed. Further, even if the number of holes 32 of the holding member 30 and the number of poles of the rotating electrical machine are relatively prime, the vibration mode of the holding member and the distribution of the suction force do not match, so that the deformation of the holding member 30 is suppressed. Can do.

(Embodiment 6)
In the present embodiment, another second stator 3 and first rotor 5 that can be employed in the rotating electrical machine shown in FIGS. 1 and 5 will be described. FIG. 10 is a perspective view of the second stator 3 and the first rotor 5 according to the present embodiment as viewed from the second surfaces 31b and 51b side of the iron cores 31 and 51. FIG. In the following description, the second stator 3 will be described, but the configuration of the first rotor 5 is the same as that of the second stator 3 shown in FIG. Therefore, the second stator 3 shown in FIG. 10 can be regarded as the first rotor 5 by replacing the component numbers as follows. Accordingly, detailed description of the configuration of the first rotor 5 is omitted. The holding member 30 is read as the holding member 50, the iron core 31 is read as the iron core 51, and the holes 32, 33, and 35 are read as holes 52, 53, and 55, respectively. Further, the walls 30 a and 30 b of the holding member 30 are the walls 50 a and 50 b of the holding member 50, the bottom plate 30 c of the holding member 30 is the bottom plate 50 c of the holding member 50, and the step surface 30 d of the holding member 30 is the step surface of the holding member 50. Read 30d respectively. Further, the second surface 31 b of the iron core 31 is read as the second surface 51 b of the iron core 51, respectively.

  Unlike the second stator 3 shown in FIG. 2, the second stator 3 shown in FIG. 10 is different from the hole 32 and a hole 32 for joining the bottom plate 30 c and the iron core 31 to the bottom plate 30 c of the holding member 30. It has a hole 35 for welding between the laminations of the iron cores 31 at the position.

  The hole 32 shown in FIG. 10 has a hole 32 a provided on the outer diameter of the holding member 30 and a hole 32 b provided on the inner diameter side. By providing the hole 32 and the hole 35 shown in FIG. 10, welding between the iron core 31 and the holding member 30 and welding between the laminated iron cores 31 can be performed separately. Therefore, it can be set as the shape of the holes 32 and 35 according to each welding. In the holding member 30 shown in FIG. 10, the hole 32 also has a step surface 30 d that is located on the same plane as the second surface 31 b of the iron core 31. Therefore, also in the holding member 30 shown in FIG. 10, the iron core 31 and the step surface 30d on the same surface are welded.

(Embodiment 7)
In the present embodiment, another second stator 3 that can be employed in the rotating electrical machine shown in FIG. 1 will be described. In FIG. 11, the perspective view which looked at the 2nd stator 3 which concerns on this Embodiment from the 2nd surface 31b side of the iron core 31 is shown.

  Unlike the second stator 3 shown in FIG. 2, the second stator 3 shown in FIG. 11 includes a recess 36 in the outer diameter side wall 30 a of the holding member 30. The concave portion 36 of the holding member 30 is provided between the adjacent holes 32. The recess 36 forms a path through which the refrigerant passes with the outer frame when used in a hermetic compressor.

  Also in the holding member 30 shown in FIG. 11, the hole 32 has a step surface 30 d located on the same plane as the second surface 31 b of the iron core 31. Therefore, also in the holding member 30 shown in FIG. 11, the iron core 31 and the step surface 30d on the same surface are welded.

(Embodiment 8)
In the present embodiment, another second stator 3 and first rotor 5 that can be employed in the rotating electrical machine shown in FIGS. 1 and 5 will be described. FIG. 12 is a perspective view of the second stator 3 and the first rotor 5 according to the present embodiment as viewed from the first surfaces 31a and 51a side of the iron cores 31 and 51. FIG. In the following description, the second stator 3 will be described, but the configuration of the first rotor 5 is the same as that of the second stator 3 shown in FIG. Therefore, the second stator 3 shown in FIG. 12 can be regarded as the first rotor 5 by replacing the component numbers as follows. Accordingly, detailed description of the configuration of the first rotor 5 is omitted. The holding member 30 is read as the holding member 50, the iron core 31 is read as the iron core 51, and the hole 33 is read as the hole 53, respectively. Further, the walls 30a and 30b of the holding member 30 are read as the walls 50a and 50b of the holding member 50, and the protrusions 30a1 and 30b1 of the holding member 30 are read as the protrusions 50a1 and 50b1 of the holding member 50, respectively. Further, the first surface 31 a of the iron core 31 is read as the first surface 51 a of the iron core 51, respectively. About the 1st rotor 5, the code | symbol is attached | subjected to FIG. 12, and detailed description is abbreviate | omitted.

  The second stator 3 shown in FIG. 12 is different from the second stator 3 shown in FIG. 2 in that the outer wall 30a and the iron core 31 of the holding member 30 and the inner wall 30b and the iron core 31 of the holding member 30 face each other. There is no contact. Specifically, a plurality of protrusions 30 a 1 are provided in the circumferential direction in the inner diameter direction of the wall 30 a on the outer diameter side of the holding member 30. Similarly, a plurality of protrusions 30b1 are received in the circumferential direction in the outer diameter direction of the wall 30b on the inner diameter side of the holding member 30. The holding member 30 holds the iron core 31 through the protrusions 30a1 and 30b1. That is, in the second stator 3 shown in FIG. 12, the wall 30a on the outer diameter side of the holding member 30 and the iron core 31 and the wall 30b on the inner diameter side of the holding member 30 and the iron core 31 are in contact only at the protrusions 30a1 and 30b1, respectively. ing. In addition, joining of the holding member 30 and the iron core 31 is welded through the hole 32 etc. which were provided in the baseplate 30c of the holding member 30 similarly to the above-mentioned embodiment.

  As described above, in the second stator 3 according to the present embodiment, since the holding member 30 and the iron core 31 are not in surface contact in the radial direction, even if the holding member 30 is a magnetic body, the iron core 31 is not provided. Is reduced from flowing to the holding member 30.

DESCRIPTION OF SYMBOLS 1 1st stator 2 Rotor 3 2nd stator 4 and 8 Rotating shaft 5 1st rotor 6 Stator 7 2nd rotor 10 Back yoke 11, 60 Teeth 12, 61 Coil 20 Frame 21 Magnetic material board 22, 72 Magnet 30, 50, 70 Holding member 31, 51 Iron core 32, 33, 35, 52 Hole 34 Groove 36 Recess 71 Yoke

Claims (13)

In the rotating electrical machine, the core is used for at least one of the rotor (5) and the stator (3) arranged to face each other with a gap in the axial direction as the direction of the rotation axis,
A core that is wound around the rotation axis and is laminated in parallel with the rotation axis, presents a first surface on the gap side of the rotation shaft, and presents a second surface on the opposite side of the gap ( 31, 51),
A holding member (30, 50) for holding at least the second surface;
The core, wherein the second surface of the iron core (31, 51) and the holding member (30, 50) are joined to each other by welding via the holding member (30, 50). The core of claim 1,
The core, wherein the holding member (30, 50) has a first hole (32, 52) in a portion to be welded to the second surface of the iron core (31, 51). The core according to claim 2,
The core, wherein the first hole (32, 52) is provided at a position including a welding position between the thin plates on which the iron cores (31, 51) are stacked. The core according to claim 3,
Welding between the holding member (30, 50) and the iron core (31, 51) in the first hole (32, 52) and welding between the laminated thin plates of the iron core (31, 51) are continuous. Core that is characterized by. The core according to claim 3 or claim 4, wherein
The first hole (32, 52) has a shape that is shifted from a radial direction with respect to the rotation shaft at its own position and extends from the inner diameter to the outer diameter of the holding member (30, 50). Core characterized by The core according to claim 3 or claim 4, wherein
A plurality of the first holes (32, 52) are provided, and a radial position with respect to the rotation axis at the position of the first hole and a radial direction with respect to the rotation axis at the position of the second hole. The core is characterized by being different in position. The core according to claim 2,
The holding member (30, 50) has a second hole (35) at a position different from the first hole (32, 52) and at a welding position between the thin plates on which the iron cores (31, 51) are stacked. , 55). The core of claim 1,
The holding member (30, 50) has a thin portion (30C1, 50c1) at a portion to be welded to the second surface of the iron core (31, 51). The core according to claim 8, wherein
The core, wherein the thin portion (30C1, 50c1) is provided at a position including a welding position between the thin plates on which the iron cores (31, 51) are stacked. The core according to claim 9, wherein
Welding between the holding member (30, 50) and the iron core (31, 51) in the thin part (30C1, 50c1) and welding between the laminated thin plates of the iron core (31, 51) are combined. A core characterized by A core according to any one of claims 1 to 10,
The core is characterized in that the welding is laser welding. A first rotor (5) having a core according to any one of claims 1 to 11;
A stator (3) disposed opposite to the first rotor (5) with the gap in the axial direction;
In the axial direction, the first rotor is disposed to be opposed to the stator (3) at a position opposite to the first rotor (5) with another gap therebetween, and has a magnetic field generator. And a second rotor (5) connected in the axial direction,
A rotating electrical machine. A first stator (3) having a core according to any one of claims 1 to 11;
A rotor (5) disposed opposite to the first stator (3) with the gap in the axial direction;
In the axial direction, a second stator (3) disposed opposite to the rotor (5) at a position opposite to the first stator (3) with another gap therebetween and having a magnetic field generator. When,
A rotating electrical machine.

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