JP2013162676A - Electric motor and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor in which laminated steel plates are firmly integrated by V-caulking parts while suppressing the performance degradation and cost increase of the electric motor, and a compressor using the electric motor.SOLUTION: An electric motor comprises a stator and a rotor each of which is formed by laminating a plurality of steel plates Sp and integrating them by V-caulking parts 114a and 114b. The stator is locally fixed to the inside of a cylindrical member, and the steel plates forming the stator include first steel plates fixed to the cylindrical member and second steel plates not fixed to the cylindrical member in the lamination direction. V-caulking parts include the first V-caulking parts 114a. In the first V-caulking part, when a cutting line of the first V-caulking part is projected on a first straight line parallel to a straight line passing through the cylinder center of the cylindrical member and the centroid of the first V-caulking part and on a second straight line orthogonal to the first straight line on a lamination plane of the steel plates, a projection length to the first straight line is longer than a projection length to the second straight line.

Description

  The present invention relates to an electric motor and a compressor.

  Conventionally, regarding a stator core used in an electric motor, a structure in which a plurality of steel plates are laminated and integrated by a V-caulking portion is known. For example, in Patent Document 1 (Japanese Patent Laid-Open No. 2008-206227), as shown in FIG. 9A, the direction of the cutting line 204 b (see FIG. 9B) of the V caulking portion 204 is the circumference of the annular base portion 202 in the annular base portion 202 of the stator core 201. A V-caulking portion 204 is disposed along the direction, and a plurality of steel plates Sp are integrated. Here, the direction of the cutting line 204 b of the V-caulking portion 204 is the long side direction of the rectangular V-caulking portion 204.

  By the way, as a method for fixing a stator used in an electric motor and a casing of the electric motor, a method in which the stator and the casing are locally fixed is known as disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-45431. Yes. In this way, when the stator and the casing are locally fixed, compared to the case where the stator and the casing are fixed by shrink fitting or press fitting, the casing vibration is suppressed, and the stress acting on the stator is reduced. There are advantages such as reduction.

  On the other hand, in the electric motor described in Patent Document 2, the steel plate of the stator core includes a steel plate fixed to the casing and a non-fixed steel plate, and uses the stator core 201 described in Patent Document 1. In this case, the present inventor has found that the steel plate Sp that is not fixed to the casing has a problem that the load on the V-caulking portion 204 generated according to the torque (electromagnetic force) acting on the stator core 201 is increased.

  Furthermore, in the stator core 201, the direction of the cutting line 204b, which is the sliding direction of the V-caulking portion 204, and the direction of the torque acting on the steel plate Sp substantially coincide. Here, the sliding direction of the V-caulking portion 204 refers to a direction in which, when a load is applied in that direction, the fixing of the V-caulking portion 204 is released and the stacked steel plates Sp are likely to be displaced. An arrow S and an arrow T in FIG. 9A indicate the sliding direction of the V-caulking portion 204 and the direction of torque acting on the steel plate Sp in the V-caulking portion 204 located on the upper left side of the annular base portion 202.

  That is, in the electric motor described in Patent Document 2, a large load is easily applied to the V-caulking portion 204, and the stator core 201 is fixed by the V-caulking portion 204 as shown in FIG. There is a problem that the steel plate Sp is easily displaced in the rotational direction. This is particularly noticeable in large motors where a large torque acts.

  As a method for suppressing the displacement of the steel sheet, there is a method of increasing the number of V-caulking portions and reducing the load generated in each V-caulking portion. However, in this case, there is a problem that the total magnetic loss in the V caulking portion increases.

  As another method of suppressing the positional deviation of the steel plate, there is a method of suppressing the positional deviation of the steel plate by increasing the number of fixing points between the casing and the stator. However, in this case, there is a problem that the number of man-hours for assembling the motor increases.

  The problem of the present invention is that when the stator and the casing are locally fixed in the stacking direction of the steel plates of the stator core, the stacked steel plates are strengthened by the V-caulking portion while suppressing reduction in efficiency and cost increase of the motor. The present invention provides an electric motor integrated with the electric motor, and a compressor using the electric motor.

  An electric motor according to a first aspect of the present invention includes a stator fixed to the inner periphery of a cylindrical member, and a rotor that is rotatably disposed in the internal space of the stator. The stator is formed by laminating a plurality of steel plates and integrating them at the V caulking portion. The steel plate includes a first steel plate fixed to the cylindrical member and a second steel plate not fixed to the cylindrical member in the stacking direction. The V caulking part includes a first V caulking part. In the first V-caulking portion, on the lamination plane of the steel plates, the cutting line of the first V-caulking portion is a first straight line parallel to a straight line passing through the cylindrical center of the cylindrical member and the centroid of the first V-caulking portion, When projected onto a second straight line orthogonal to the first straight line, the projection length onto the first straight line is longer than the projection length onto the second straight line.

  In this electric motor, the radial component of the cutting line of the first V caulking portion is larger than the circumferential component when viewed from the center of the cylindrical member on the plane of lamination of the steel plates constituting the stator. That is, the direction of the cutting line of the first V caulking portion approaches the radial direction of the cylindrical member. Therefore, even when the load acting on the first V-caulking portion generated according to the torque acting on the stator is large, the load acting in the sliding direction of the first V-caulking portion can be reduced. As a result, even in the second steel plate that is not fixed to the cylindrical member, misalignment is easily suppressed, and the state in which the stacked steel plates are integrated can be maintained. Here, the direction of the cutting line of the first V-caulking portion is referred to as the sliding direction of the first V-caulking portion.

  In the electric motor according to the second aspect of the present invention, in the compressor according to the first aspect, in the first V caulking portion, the first cutting line and the first straight line are parallel.

  Here, since the load acting in the sliding direction of the first V-caulking portion is substantially zero, it becomes easier to maintain the state in which the laminated steel plates are integrated.

  In the compressor according to the third aspect of the present invention, in the electric motor according to the first aspect or the second aspect, the V-caulking part further includes a second V-caulking part. In the second V-caulking portion, on the plane of lamination of the steel plates, the cutting line of the second V-caulking portion is divided into a third straight line parallel to a straight line passing through the cylindrical center of the cylindrical member and the centroid of the second V-caulking portion, and a third straight line When projected onto a fourth straight line orthogonal to the projection length, the projection length onto the fourth straight line is longer than the projection length onto the third straight line.

  In this case, the direction of the cutting line approaches the circumferential direction of the cylindrical member in the second V caulking portion. That is, the cutting line of the second V-caulking portion can be easily oriented in the circumferential direction, and the second V-caulking portion can be disposed close to the outer peripheral edge of the stator. Since the magnetic flux density is small in the vicinity of the outer periphery of the stator, magnetic loss can be suppressed by providing the second V caulking portion.

  A compressor according to a fourth aspect of the present invention is the electric motor according to any one of the first aspect to the third aspect, wherein the V caulking part is from the first V caulking part to the nth (n is an integer of 2 or more) V caulking part. It is. The stator has a substantially annular yoke portion and a plurality of teeth extending inward from the inner peripheral surface of the yoke portion. The centroids of the first to nV caulking portions are arranged on the center line of the teeth.

  Thereby, the magnetic flux path is easily secured, and it is easy to suppress magnetic loss due to the V-caulking portion. As a result, a highly efficient electric motor can be realized.

  An electric motor according to a fifth aspect of the present invention is the electric motor according to the fourth aspect, in which the first to nV caulking portions are arranged in the vicinity of the outer periphery of the yoke portion.

  In this case, since the magnetic flux density is small in the vicinity of the outer periphery of the yoke portion, magnetic loss due to the V-caulking portion can be suppressed.

  A compressor according to a sixth aspect of the present invention includes an electric motor and a compression mechanism. The electric motor is an electric motor according to any one of the first to fifth aspects. The compression mechanism is driven by an electric motor and compresses a fluid to be compressed.

  In this case, the displacement of the steel plate hardly occurs in the stator of the electric motor, and a compressor with few failures and defects can be realized.

  In the electric motor according to the first aspect of the present invention, the radial component of the cutting line of the first V caulking portion is larger than the circumferential component when viewed from the center of the cylindrical member on the lamination plane of the steel plates constituting the stator. . Therefore, even when the load acting on the first V-caulking portion generated according to the torque acting on the stator is large, the load acting in the sliding direction of the first V-caulking portion is reduced. As a result, even in the second steel plate that is not fixed to the cylindrical member, the positional deviation is easily suppressed, and the state in which the stacked steel plates are integrated is maintained.

  In the electric motor according to the second aspect of the present invention, since the magnitude of the load acting in the sliding direction of the first V-caulking portion is substantially zero, the displacement of the steel sheet is further suppressed.

  In the electric motor according to the third aspect of the present invention, the laminated steel plates are integrated by providing both the first V-caulking portion that can suppress the positional deviation of the steel plates and the second V-caulking portion with less magnetic loss. Both maintenance and reduction of magnetic loss can be achieved.

  In the electric motor according to the fourth aspect or the fifth aspect of the present invention, magnetic loss can be reduced.

  In the compressor according to the sixth aspect of the present invention, a compressor with few failures and defects is realized.

The block diagram of the compressor provided with the electric motor which concerns on embodiment of this invention. The top view of the compressor in the II-II arrow of FIG. 1 which concerns on embodiment of this invention. The top view of the stator core which concerns on embodiment of this invention. The enlarged view near the 1st caulking part in the stator core concerning the embodiment of the present invention (part 3B in Drawing 3A). The enlarged view near the 2nd caulking part in the stator core concerning the embodiment of the present invention (part 3C in Drawing 3A). The schematic diagram which shows the cylindrical member of the casing of the compressor which concerns on embodiment of this invention, and the welding point of a stator. Sectional drawing of the crimping | crimped part in the VV cross section of FIG. 3A which concerns on embodiment of this invention. Sectional drawing of the crimping | crimped part in the VI-VI cross section of FIG. 3A which concerns on embodiment of this invention. The example of arrangement | positioning of the 1st V crimping part which concerns on embodiment of this invention, and a 2nd V crimping part. Sectional drawing of the cylinder of the rotary compression mechanism in the VIII-VIII arrow of FIG. 1 which concerns on embodiment of this invention. The top view of the stator core of the conventional stator. Enlarged view of the vicinity of the caulking portion in the stator core of the conventional stator (FIG. 9B portion in FIG. 9A) It is sectional drawing of the V crimping part in the XX cross section of FIG. 9A, Comprising: The state which the fixation of the V crimping part removed by the load which acts on a V crimping part is shown.

(1) Overall Configuration Hereinafter, the configuration of the compressor of the present embodiment will be described.

  As shown in FIG. 1, a rotary compressor 1 incorporating an electric motor 100 according to an embodiment of the present invention mainly includes a casing 10, an electric motor 100, a shaft 30, and a rotary compression mechanism 40.

  The configuration of the rotary compressor 1 will be described in detail below. In the following description, the direction of the arrow U shown in FIG. 1 is called up, and the direction opposite to the arrow U is called down.

(2) Detailed configuration (2-1) Casing 10
The casing 10 will be described with reference to FIG.

  The casing 10 of the rotary compressor 1 includes a cylindrical member 11 that is open at the top and bottom, and an upper lid 12a and a lower lid 12b that are provided above and below the cylindrical member 11, respectively. Below the casing 10, a suction pipe 15 that sucks in a refrigerant that is a fluid compressed by the rotary compression mechanism 40 is provided through the casing 10. A discharge pipe 16 that discharges fluid is provided above the casing 10 so as to penetrate the casing 10.

(2-2) Electric motor 100
The electric motor 100 includes a stator 110 and a rotor 120. The electric motor 100 drives the rotary compression mechanism 40 via the shaft 30.

(2-2-1) Stator 110
A stator 110 shown in FIGS. 1 and 2 includes a stator core 111, insulators 115a and 115b disposed on both upper and lower end faces of the stator core 111, and a coil 116 wound around the stator core 111 and the insulators 115a and 115b. And having.

  In FIG. 2, first and second V caulking portions 114a and 114b described later are omitted. Moreover, in FIG. 2, the code | symbol is partially abbreviate | omitted about the same member.

  The stator core 111 has a substantially annular yoke portion 112 and nine teeth 113 that extend inward from the inner peripheral surface of the yoke portion 112 and are arranged at equal intervals in the circumferential direction. A cutout portion 118 is formed on the outer periphery of the yoke portion 112 by cutting out from the upper end to the lower end of the stator core 111. The notch 118 is formed at the same circumferential position as the tooth 113 so as to face the tooth 113. A coil 116 is wound around each tooth 113, and a magnetic field is generated when the coil 116 is energized. Here, the number of teeth 113 is an example, and is not limited to this.

  The stator core 111 is composed of a plurality of stacked steel plates Sp. As shown in FIG. 3A, the steel plate Sp is formed with a first V-caulking portion 114a and a second V-caulking portion 114b, and the laminated steel plates Sp are integrally formed by the first and second V-caulking portions 114a and 114b. The shape and arrangement of the first and second V caulking portions 114a and 114b will be described later.

  Next, the fixed state of the stator 110 and the cylindrical member 11 will be described.

  As shown in FIG. 1, the outer peripheral surface of the stator 110 is TAG welded at welding points 117a, 117b, and 117c in a state in which a predetermined gap is provided with the inner peripheral surface of the cylindrical member 11, that is, in a state of clearance fitting. Yes. TAG welding is an example of a welding method, and may be fixed by laser welding or the like.

  The welding points 117a, 117b, and 117c are located between the two teeth 113 adjacent to the outer peripheral surface of the yoke portion 112, as shown in the plan view of the cross section of the compressor in the direction of arrows II-II in FIG. Nine locations are provided at approximately equal intervals (approximately every 40 degrees) so as to be positioned. The welding points are alternately provided in the order of 117a, 117b, and 117c in the clockwise direction.

  Further, the welding points 117a, 117b and 117c are provided in three upper and lower stages as shown in FIGS. In each stage, three welding points 117a, 117b, or 117c are provided at approximately equal intervals in the circumferential direction (approximately every 120 degrees).

  The steel plate Sp of the stator core 111 located at the height at which the welding points 117a, 117b, and 117c are provided is fixed to the cylindrical member 11 by welding. In other words, the steel plate Sp positioned other than the height at which the welding points 117a, 117b, and 117c are provided is not fixed to the cylindrical member 11 by welding. Therefore, the steel plate Sp includes the first steel plate Sp1 fixed to the cylindrical member 11 and the second steel plate Sp2 not fixed to the cylindrical member 11 in the stacking direction of the steel plates Sp. Sp1 and Sp2 in FIG. 4 illustrate the first steel plate Sp1 and the second steel plate Sp2. In addition, Sp1 in FIG. 4 shows the 1st steel plate Sp1 of the height in which the welding point 117a was provided, Sp2 in FIG. 4 is the height in which the welding point 117a was provided, and the height in which the welding point 117b was provided. The 2nd steel plate Sp2 located in the meantime is shown.

<Shaped part shape>
The shape of the 1st and 2nd V crimping parts 114a and 114b is demonstrated using FIG. 3A, FIG. 3B, FIG. 3C, FIG. In FIG. 3A, some of the same members are omitted.

  The shapes of the first and second V crimping portions 114a and 114b are both the same rectangle. In the first V caulking portion 114a, the steel plate Sp is cut by the first cutting portion 119a shown in FIG. 3B, and in the second V caulking portion 114b, the second cutting portion 119b shown in FIG. 3C. At the time of cutting the steel plate Sp at the first cutting portion 119a and the second cutting portion 119b, the first and second caulking portions 114a and 114b are formed with convex portions using a wedge-shaped punch. The height of the convex portion is about the plate pressure of the steel plate Sp. The formed convex part is connected with the concave part formed in the steel plate to fix.

  5A and 5B show cross-sectional views of the first V-caulking portion 114a (cross-sectional views of the first V-caulking portion 114a in the long side direction and the short side direction) in the VV cross section and the VI-VI cross section of FIG. 3A. Here, only the first V-caulking portion 114a will be described with reference to FIGS. 5 and 6, but the shape is the same when the second V-caulking portion 114b is viewed in the long-side cross section and the short-side cross-section. is there.

  In the VV cross section of the first V caulking portion 114a, the convex portion of the first V caulking portion 114a is formed in a substantially V shape as shown in FIG. When a load is applied in the direction of the arrow F1 in FIG. 5, that is, when a load is applied in the long side direction of the first V-caulking portion 114a, slip is likely to occur on the inclined surface of the first V-caulking portion 114a. Here, the direction in which slippage of the V-caulking portion is likely to occur is referred to as the slip direction of the V-caulking portion.

  In the VI-VI cross section of the first V-caulking portion 114a, the convex portion of the first V-caulking portion 114a is on a discontinuous step as shown in FIG. In this case, even if a load acts in the direction of arrow F2 in FIG.

<Arrangement of caulking section>
Next, the arrangement of the first and second V crimping portions 114a and 114b will be described with reference to FIG. FIG. 7 illustrates in detail the arrangement of each representative one of the first V-caulking portion 114a and the second V-caulking portion 114b, and the other first V-caulking portion 114a and the second V-caulking portion 114b are also illustrated. It is the same.

  The first and second V-caulking portions 114a and 114b are arranged in the order of the first V-caulking portion 114a, the second V-caulking portion 114b, and the second V-caulking portion 114b in the clockwise direction. A total of nine V-caulking portions are provided, a total of three first V-caulking portions 114a and a total of six second V-caulking portions 114b.

  In the first V-caulking portion 114a, the first cutting line 119a of the first V-caulking portion 114a is projected onto a first straight line L1 parallel to a straight line passing through the cylindrical center O of the cylindrical member 11 and the centroid Ga of the first V-caulking portion. When this is done, the projected length D1 is substantially equal to the length of the first cutting line 119a. On the other hand, the projection length D2 when the first cutting line 119a of the first V caulking portion is projected onto the second straight line L2 orthogonal to the first straight line L1 is substantially zero. In other words, the first cutting line 119a and the first straight line L1 are substantially parallel. That is, when viewed from the center O of the cylindrical member, the circumferential component of the first cutting line 119a of the first V-caulking portion 114a is substantially zero, and the first cutting line 119a of the first V-caulking portion 114a is substantially the radius of the cylindrical member. Facing the direction. As a result, in the first V-caulking portion 114a, the direction (circumferential direction) of torque (electromagnetic force) applied to the stator 110 and the sliding direction of the first V-caulking portion 114a are substantially perpendicular, and the sliding direction of the first V-caulking portion 114a. The load is difficult to act on. That is, the positional deviation of the steel plate Sp of the stator core 111 is unlikely to occur.

  On the other hand, in the second V caulking portion 114b, the second cutting line 119b of the second V caulking portion 114b is on a third straight line L3 parallel to a straight line passing through the cylindrical center O of the cylindrical member 11 and the centroid Gb of the second V caulking portion. When projected, its projection length D3 is approximately zero. In other words, the second cutting line 119b and the fourth straight line L4 are substantially perpendicular. On the other hand, the projection length D4 when the second cutting line 119b of the second V crimping portion is projected onto the fourth straight line L4 orthogonal to the third straight line L3 is substantially equal to the length of the second cutting line 119b. That is, when viewed from the center O of the cylindrical member, the radial component of the second cutting line 119b of the second V caulking part 114b is substantially zero, and the second cutting line 119b of the second V caulking part 114b is substantially Facing the direction. In the second V caulking portion 114b, the direction of the second cutting line 119b, that is, the direction of the long side is directed in the circumferential direction, so the second V caulking portion 114b is closer to the outer periphery of the yoke portion 112 than the first V caulking portion 114a. Can be placed close together. In the yoke portion 112, the magnetic flux density decreases as it approaches the outer peripheral edge, and therefore the magnetic loss is easily suppressed in the second V caulking portion 114b.

  Next, as a common feature related to the arrangement of the first and second V caulking portions 114 a and 114 b, the centroids Ga and Gb are arranged on the center line of the nearest tooth 113. By arranging the centroids Ga and Gb of the first and second V-caulking portions 114a and 114b on the center line of the tooth 113, the V-caulking portion hardly obstructs the magnetic flux path, and the magnetic loss is easily suppressed. However, the arrangement of the V-caulking portion is not limited to this.

  As another common feature, the first and second V caulking portions 114a and 114b are arranged as close to the outer peripheral edge of the yoke portion 112 as possible. In the yoke portion 112, the magnetic flux density decreases as it approaches the outer peripheral edge. Therefore, even if the first and second V caulking portions 114a and 114b are arranged, magnetic loss can be suppressed. However, the arrangement of the V-caulking portion is not limited to this.

(2-2-2) Rotor 120
The rotor 120 is rotatably disposed in the internal space of the stator 110 via the stator 110 and the air gap space. The rotor 120 is connected to the main shaft 31 of the shaft 30 and rotates together with the shaft 30.

  Magnet 125 is arranged on rotor 120 so as to face the magnetic field generated by coil 116. As shown in FIGS. 1 and 2, the magnet 125 is inserted into six slots 126 extending in the axial direction of the rotor 120.

(2-3) Shaft 30
The shaft 30 includes a main shaft 31 that extends along the central axis of the cylindrical member 11 and an eccentric portion 32 that is eccentric with respect to the main shaft 31. The eccentric portion 32 is rotatably connected to a swing piston 41 of a rotary compression mechanism 40 described later.

(2-4) Rotary compression mechanism 40
The rotary compression mechanism 40 is fixed to a mounting plate 49 fixed to the cylindrical member 11 by a welded portion 49a by screwing. 1 and 8, the rotary compression mechanism 40 includes a swing piston 41 having a blade 42, a bush 43 that supports the blade 42 so as to swing, a cylinder 47, a front head 48a, and a rear head. 48b.

  The cylinder 47 has a cylinder chamber S1 that houses the swing piston 41, a bush housing hole 45a into which the bush 43 is rotatably inserted, and a blade housing hole 45b that communicates with the bush housing hole 45a.

  The oscillating piston 41 receives the rotational driving force of the electric motor 100, and the eccentric portion 32 of the shaft 30 rotates eccentrically, thereby oscillating inside the cylinder chamber S1, thereby causing the fluid sucked from the suction pipe 15 to flow. Compression is performed inside the cylinder chamber S1. The compressed fluid rises through the inside of the casing 10 and is discharged from the discharge pipe 16.

  The front head 48 a is a member disposed on the upper end surface of the cylinder 47 and is screwed to a mounting plate 49 fixed to the cylindrical member 11. An upper bearing 50 is formed integrally with the front head 48a. The shaft 30 is inserted into the upper bearing 50.

  The rear head 48 b is a member disposed on the lower end surface of the cylinder 47. A lower bearing 51 is formed integrally with the rear head 48b. The shaft 30 is inserted into the lower bearing 51.

(3) Features (3-1)
The electric motor 100 of the compressor 1 according to the present embodiment includes a stator 110 fixed to the inner periphery of the cylindrical member 11 and a rotor 120 that is rotatably disposed in the internal space of the stator 110. The stator 110 is formed by laminating a plurality of steel plates Sp and integrating them with V caulking portions 114a and 114b. The steel plate Sp includes a first steel plate Sp1 fixed to the cylindrical member 11 and a second steel plate Sp2 not fixed to the cylindrical member 11 in the stacking direction. The V-caulking portions 114a and 114b include a first V-caulking portion 114a. In the first V-caulking portion 114a, the first cutting line 119a of the first V-caulking portion 114a is a straight line passing through the cylindrical center O of the cylindrical member 11 and the centroid Ga of the first V-caulking portion 114a on the plane of lamination of the steel plates Sp. When projected onto the parallel first straight line L1 and the second straight line L2 orthogonal to the first straight line L1, the projection length D1 onto the first straight line L1 is greater than the projected length D2 onto the second straight line L2. long.

  In this case, the radial component of the first cutting line 119a of the first V caulking portion 114a is larger than the circumferential component when viewed from the center O of the cylindrical member 11 on the lamination plane of the steel plates Sp constituting the stator. That is, the direction of the first cutting line 119a of the first V crimping portion 114a approaches the radial direction of the cylindrical member 11. Accordingly, the direction of the first cutting line 119a of the first V-caulking portion 114a, which is the sliding direction of the first V-caulking portion 114a, even when the load acting on the first V-caulking portion 114a generated according to the torque acting on the stator 110 is large. The load acting on is reduced. As a result, even if it is the 2nd steel plate Sp which is not fixed to the cylindrical member 11, position shift is easy to be suppressed and the state where the laminated steel plate Sp was integrated is maintained.

(3-2)
In the electric motor 100 of the compressor 1 according to the present embodiment, in the first V caulking portion 114a, the first cutting line 119a is substantially parallel to the first straight line L1.

  Since the load acting on the sliding direction of the first V-caulking portion 114a is substantially zero, it is easy to maintain the state in which the stacked steel plates Sp are integrated.

(3-3)
In the electric motor 100 of the compressor 1 according to this embodiment, the V-caulking portions 114a and 114b further include a second V-caulking portion 114b. In the second V-caulking portion 114b, the second cutting line 119b of the second V-caulking portion 114b is parallel to a straight line passing through the cylindrical center O of the cylindrical member 11 and the centroid Gb of the second V-caulking portion on the lamination plane of the steel plates Sp. When projected onto the third straight line L3 and the fourth straight line L4 orthogonal to the third straight line L3, the projection length D4 onto the fourth straight line L4 is longer than the projection length D3 onto the third straight line L3. .

  In the second V caulking portion 114b, the direction of the cutting line approaches the circumferential direction of the cylindrical member. Therefore, it becomes easy to arrange the second V caulking portion close to the outer peripheral edge of the stator. Since the magnetic flux density is small in the vicinity of the outer periphery of the stator, it is easy to suppress magnetic loss by providing the second V caulking portion.

(3-4)
The electric motor 100 of the compressor 1 according to the present embodiment includes a first V caulking portion 114a and a second V caulking portion. The stator 110 includes a substantially annular yoke portion 112 and a plurality of teeth 113 extending inward from the inner peripheral surface of the yoke portion 112. The centroids Ga and Gb of the first and second V caulking portions 114 a and 114 b are arranged on the center line of the teeth 113.

  Thereby, a magnetic flux path is easily secured, and it is easy to suppress magnetic loss due to the first and second V caulking portions 114a and 114b. As a result, a highly efficient electric motor can be realized.

(3-5)
In the electric motor 100 of the compressor 1 according to the present embodiment, the first and second V caulking portions 114 a and 114 b are disposed in the vicinity of the outer periphery of the yoke portion 112.

  Since the magnetic flux density is reduced in the vicinity of the outer periphery of the yoke portion 112, it is easy to suppress magnetic loss due to the first and second V-caulking portions 114a and 114b.

(3-6)
The compressor 1 according to the present embodiment includes the electric motor 100 having the above characteristics and the rotary compression mechanism 40. The rotary compression mechanism 40 is driven by the electric motor 100 and compresses the fluid to be compressed. Here, the displacement of the steel plate Sp hardly occurs in the stator 110 of the electric motor 100, and the compressor 1 with few failures and defects is realized.

(4) Modifications Modifications of the present embodiment are shown below. A plurality of modified examples may be appropriately combined.

(A)
Although the electric motor 100 shown by said embodiment is used for the compressor 1, it may replace with a compressor and may be used for the motor of a pump, an industrial machine, etc., for example. Moreover, when applied to a compressor, the invention is not limited to a rotary compressor, and may be applied to, for example, a scroll compressor.

(B)
The cross-sectional shape seen from the long side of the V-caulking portion shown in the above embodiment is not limited to a substantially V shape, and may be, for example, a substantially trapezoidal shape or a substantially U shape.

(C)
The first and second V caulking portions 114a and 114b shown in the above embodiment are rectangular, but are not limited thereto. For example, a substantially trapezoidal shape may be used. Moreover, the dimension and shape of each V crimping part may differ.

(D)
In the first and second V crimping portions 114a and 114b shown in the above embodiment, the long side of the rectangle is the cutting line, but the short side may be the cutting line.

(E)
In the above embodiment, the first cutting line 119a is substantially parallel to the first straight line L1, and the second cutting line 119b is substantially parallel to the fourth straight line L4. That is, the projection length D2 of the first V-caulking portion 114a on the second straight line L2 of the first cutting line 119a and the projection length D3 of the second V-caulking portion 114b on the third straight line L3 of the second cutting line 119b are substantially the same. Zero. However, it is not limited to this.

  In the 1st V crimping part 114a, the projection length D1 to the 1st straight line L1 of the 1st cutting line 119a of the 1st V crimping part 114a should just be longer than said D2. In the 2nd V crimping part 114b, the projection length D4 to the 4th straight line L4 of the 2nd cutting line 119b of the 2nd V crimping part 114b should just be longer than said D3. That is, as long as the above relationship is satisfied, the first V-caulking portion 114a does not need to face the substantially radial direction, and the second V-caulking portion 114b does not need to face the substantially circumferential direction.

  If D1> D2 is satisfied, the load acting on the sliding direction of the first V caulking portion 114a tends to be small. On the other hand, if D3 <D4 is satisfied, the second V caulking portion 114b tends to suppress magnetic loss.

  Furthermore, in the above embodiment, all the first V caulking portions 114a are directed in the same direction (substantially radial direction of the cylindrical member 11), but the first cutting line is within a range where the relationship of D1> D2 is satisfied. The angle formed by 119a and the straight line connecting the center O of the cylindrical member and the centroid Ga of the first V-caulking portion 114a may be different for each first V-caulking portion 114a. The same applies to the second V caulking portion 114b.

(F)
In the above embodiment, only the first V-caulking portion 114a and the second V-caulking portion 114b are shown, but the third V-caulking portion has the same D1 and D2 (D3 and D4 are equal). Also good.

(G)
In the above embodiment, the total number of V-caulking portions and the number of teeth coincide with each other, but the present invention is not limited to this. In addition, although nine V-caulking portions are provided with three first V-caulking portions 114a and six second V-caulking portions 114b, the present invention is not limited to this. There may be at least one first V-caulking portion 114a, and all the V-caulking portions may be used as the first V-caulking portion 114a.

(H)
In the above embodiment, the welding points 117a, 117b, and 117c to which the cylindrical member 11 and the stator 110 are fixed are 9 places in total, and are arranged in three upper and lower stages, but this is an example. Nine or more locations may be used, and fixed locations may be arranged in two or more steps or four or more steps. However, from the viewpoint of assembly man-hours, etc., it is desirable that the number of fixing points be as small as possible within the range where the strength can be maintained.

  Further, the arrangement pattern of the welding points 117a, 117b, and 117c as the fixed portions is not limited to that shown in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Compressor 11 Cylindrical member 30 Shaft 40 Rotary compression mechanism (compression mechanism)
100 Motor 110 Stator 112 Yoke part 113 Teeth 114a 1st V caulking part 114b 2nd V caulking part 119a 1st cutting line 119b 2nd cutting line 120 Rotor O Cylindrical member center Ga 1st V caulking part centroid Gb 2nd V caulking part centroid L1 First straight line L2 Second straight line L3 Third straight line L4 Fourth straight line D1 Projection length D2 of the cutting line of the first V-caulking part onto the first straight line D2 Projection length D3 of the cutting line of the first V-caulking part onto the second straight line Projection length D4 of the cutting line of the second V crimping portion onto the third straight line Projection length Sp of the cutting line of the second V crimping portion onto the fourth straight line Sp Steel plate Sp1 First steel plate Sp2 Second steel plate

JP 2008-206227 A JP 2008-45431 A

Claims (6)

A stator (110) fixed to the inner periphery of the cylindrical member (11);
A rotor (120) rotatably disposed in the internal space of the stator;
An electric motor (100) comprising:
The stator is formed by laminating a plurality of steel plates (Sp) and integrating them with V caulking portions (114a, 114b),
The steel plate includes a first steel plate (Sp1) fixed to the cylindrical member and a second steel plate (Sp2) not fixed to the cylindrical member in the stacking direction,
The V-caulking portion includes a first V-caulking portion (114a),
In the first V caulking portion, on the lamination plane of the steel plates, the first cutting line (119a) of the first V caulking portion is aligned with the cylindrical center (O) of the cylindrical member and the centroid (Ga) of the first V caulking portion. ) Is projected onto a first straight line (L1) parallel to a straight line passing through and a second straight line (L2) orthogonal to the first straight line, the projection length (D1) onto the first straight line is An electric motor longer than a projection length (D2) onto the second straight line. In the first V crimping portion, the first cutting line and the first straight line are parallel.
The electric motor according to claim 1. The V-caulking portion further includes a second V-caulking portion (114b),
In the second V-caulking portion, the cutting line of the second V-caulking portion is parallel to a straight line passing through the cylindrical center of the cylindrical member and the centroid (Gb) of the second V-caulking portion on the lamination plane of the steel plates. When projected onto the third straight line (L3) and the fourth straight line (L4) orthogonal to the third straight line, the projection length (D4) onto the fourth straight line is the projection length onto the third straight line. Longer than (D3),
The electric motor according to claim 1 or 2. The V-caulking portion is the first V-caulking portion to the n-th (n is an integer of 2 or more) V-caulking portion (114a, 114b),
The stator includes a substantially annular yoke portion (112) and a plurality of teeth (113) extending inward from an inner peripheral surface of the yoke portion,
The centroids (Ga, Gb) of the first to nV caulking portions are arranged on the center line of the teeth.
The electric motor according to any one of claims 1 to 3. The first to nV caulking portions are disposed in the vicinity of the outer periphery of the yoke portion.
The electric motor according to claim 4. The electric motor according to any one of claims 1 to 5,
A compression mechanism (40) driven by the electric motor and compressing a fluid to be compressed;
With compressor.

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