JPWO2019175930A1 - Motor stator and motor - Google Patents

Abstract

The present invention relates to a stator of an electric motor having a stator core formed by laminating a plurality of stator core plates having a core back portion and a teeth portion. The stator core plates are connected to each other by a caulking portion provided on the core back portion. The stator core plate consists of a protrusion having a shape in which the portion located between the two notches made in the stator core plate is cut out in a direction orthogonal to the surface direction of the stator core plate, and the stator core plate. It is provided with a penetrating portion. The stator core plates adjacent to each other in the stacking direction have a positional relationship in which the protruding portion and the penetrating portion are misaligned with each other, and the two cut end faces of the protruding portion are overlapped on the tip side of the protruding portion. While the crimped portion is formed by being press-fitted into the penetrating portion of the plate, the surfaces other than the two notched end faces are located in the penetrating portion without contacting the inner surface of the penetrating portion, so that the stator core plates do not have a gap between them. It has a laminated structure.

Description

The present invention relates to a stator of an electric motor and an electric motor, and more particularly to a structure of a stator core of the stator.

Conventionally, for example, a stator of an electric motor mounted on a closed compressor is formed by combining a plurality of stator cores in an annular shape (see, for example, Patent Document 1). The stator core has a structure in which a plurality of stator core plates made of electromagnetic steel plates are laminated and fixed to each other by a caulking portion. The stator core plate is composed of an arcuate core back portion and a teeth portion extending from the core back portion in the axial direction of the stator. In Patent Document 1, two caulking portions are provided on the core back portion. , One place is provided in the teeth part.

Since the caulked portion is formed by plastically deforming the stator core plate, residual stress is generated in the caulked portion. When the residual stress is generated in this way, an eddy current is generated when the magnetic flux passes through the crimped portion or the vicinity of the crimped portion, and the iron loss increases. Therefore, in order to improve this, it is effective to have a configuration in which the caulking portion is not provided in the portion having a high magnetic flux density during operation of the electric motor, specifically, the teeth portion having a higher magnetic flux density than the core back portion. With this configuration, it is possible to improve the efficiency of the motor by reducing iron loss.

However, in the case of a centralized winding motor, since winding is applied only to the teeth portion, a force acts on the teeth portion in the direction of compressing the laminated stator core plate. As a result, the laminated gap, which is the gap between the laminated stator core plates, is crushed and shortened on the teeth portion side, while the original length is maintained on the core back portion side due to the caulking portion. Therefore, the thickness of the stator core is shorter on the teeth portion side than on the core back portion side. That is, a partial difference in product thickness and a difference in space ratio occur in the stator core. Here, the space factor is the ratio of the conductor to the cross section of the coil wound around the teeth portion.

When such a difference in product thickness and difference in space factor occurs, it becomes difficult to ensure the alignment of the windings, and the windings of adjacent phases interfere with each other. As a result, the insulation property, which is one of the winding qualities, deteriorates, and the winding slackens, and the yield at the time of motor production deteriorates due to the reworking and the like. For this reason, it has been a technical barrier when aiming to improve motor efficiency by increasing the number of turns by using thin wires, which are difficult to ensure the alignment of windings.

On the other hand, in Patent Document 1, although a crimped portion is provided in the tooth portion, the shape of the crimped portion is devised so that the coil is wound while maintaining the insulation between the layers. As a result, while the caulking portion is provided in the tooth portion having a high magnetic flux density, the eddy current loss due to the caulking portion is reduced and high winding quality is ensured.

Japanese Unexamined Patent Publication No. 2008-043102

In Patent Document 1, the shape of the crimped portion provided on the teeth portion is devised, and the crimped portion of the teeth portion has a shape different from that of the crimped portion provided on the core back portion. In this way, if the shape of the crimped portion differs between the teeth portion and the core back portion, it is difficult to make the stacking gap uniform between the teeth portion side and the core back portion side after winding the teeth portion. it is conceivable that. Therefore, there is a possibility that a difference in product thickness and a difference in space factor may occur between the core back portion side and the teeth portion side.

Note that Patent Document 1 uses an approach of devising the shape of the crimped portion so that the eddy current can be reduced while the crimped portion is provided on the teeth portion in order to reduce the iron loss caused by providing the crimped portion on the teeth portion. is there. However, as another approach, an approach of obtaining a structure in which a difference in product thickness and a difference in space factor do not occur even if the teeth portion is not provided with a caulking portion is conceivable. However, Patent Document 1 does not consider this approach at all.

The present invention has been made to solve the above-mentioned problems, and it is possible to prevent a local difference in product thickness and a difference in space factor of the stator core, even though the teeth portion is not provided with a caulking portion. It is an object of the present invention to provide a stator of an electric motor and an electric motor.

The stator of the electric motor according to the present invention is a stator of an electric motor having a stator core formed by laminating a plurality of stator core plates having a core back portion and a teeth portion, in which the stator core plates are connected to each other. , The stator core plate is connected to each other by a caulking portion provided on the core back portion, and the portion located between the two notches made in the stator core plate is orthogonal to the surface direction of the stator core plate. It is provided with a protruding portion having a shape cut up in the direction of the stator and a penetrating portion penetrating the stator core plate, and the protruding portion and the penetrating portion are misplaced with each other between the stator core plates adjacent to each other in the stacking direction. The two notched end faces of the protruding portion are press-fitted into the penetrating portion of the stator core plate overlapped on the tip end side of the protruding portion to form a caulking portion, while the surfaces other than the two notched end faces are formed. By being located in the penetrating portion without contacting the inner surface of the penetrating portion, the stator core plates have a structure in which they are laminated without a gap.

According to the present invention, the core back portion is provided with a caulking portion, and the stator core plates are laminated without gaps in a state where the stator core plates are bonded to each other at the caulking portion. It is possible to prevent a local difference in the thickness of the stator core and a difference in the space factor even though the portion is not provided with a caulking portion.

It is the schematic sectional drawing of the closed type compressor in Embodiment 1 of this invention. It is a figure which shows the magnetic flux image in a stator core. It is an exploded perspective view of the rotor core of the stator of the closed type compressor in Embodiment 1 of this invention. FIG. 5 is an enlarged perspective view of a protruding portion of a rotor core of a stator of a closed compressor according to the first embodiment of the present invention. It is a figure which shows the rotor core of the stator of the closed type compressor in Embodiment 1 of this invention. It is an enlarged view of the part surrounded by the dotted line of FIG. 5 (b). It is an enlarged view of FIG. 5 (c). It is an enlarged view of FIG. 5 (d). It is an enlarged view of FIG. 5 (e). It is an enlarged view of the part surrounded by the dotted line of FIG. It is sectional drawing at the center line of the rotor core of the stator of the closed type compressor in Embodiment 1 of this invention. It is an exploded perspective view of the rotor core of the stator of the closed type compressor in Embodiment 2 of this invention. It is a figure which shows the rotor core of the stator of the closed type compressor in Embodiment 2 of this invention. It is an enlarged view of the part surrounded by the dotted line of FIG. 13B. It is an enlarged view of FIG. 13 (c). It is an enlarged view of FIG. 13 (d). It is an enlarged view of FIG. 13 (e). It is an enlarged view of FIG. 13 (f). It is an enlarged view of the part surrounded by the dotted line of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. In addition, the shape, size, arrangement, and the like of the configurations shown in each figure can be appropriately changed within the scope of the present invention.

Embodiment 1.
First, the sealed compressor provided with the stator of the electric motor according to the first embodiment will be described.
FIG. 1 is a schematic cross-sectional view of the closed compressor according to the first embodiment of the present invention. The overall configuration of the sealed compressor will be described below.
As the closed type compressor 130, a one-cylinder type rotary compressor will be described as an example. The closed compressor 130 houses a compression element 102 that compresses the refrigerant and an electric motor 103 that drives the compression element 102 in the closed container 101 composed of the upper container 101a and the lower container 101b. The compression element 102 and the electric motor 103 are connected by a crankshaft 104, and the compression element 102 is housed in the lower part of the closed container 101 and the electric motor 103 is housed in the upper part of the closed container 101. Further, a suction connecting pipe 128 for sucking gas is connected to the side surface of the closed container 101, and a discharge pipe 129 for discharging compressed gas is connected to the upper surface of the closed container 101.

The electric motor 103 includes an annular stator 1 and a rotor 5 that is rotatably held on the inner peripheral side of the stator 1. For the electric motor 103, for example, a brushless DC motor is used. The stator 1 is fixed to the lower container 101b by shrink fitting. The rotor 5 is fixed to the crankshaft 104 by shrink fitting.

The stator 1 is formed by combining a plurality of stator cores 10 in an annular shape. The stator core 10 is formed by laminating a stator core plate 11 formed by punching a thin electromagnetic steel plate. Insulators 3 made of an insulating material are attached to both ends of the stator 1 in the axial direction of the stator core 10. Then, the coil 4 is wound around the stator core 10 via the insulator 3.

The lead wire 9 of the stator 1 is connected to a glass terminal 119 provided in the upper container 101a in order to supply electric power from the outside of the closed container 101. Then, when electric power is supplied to the stator 1, the crankshaft 104 and the rotor 5 rotate.

The rotor 5 has an annular core 5a formed by laminating a rotor core plate formed by punching a thin electromagnetic steel plate. A magnet insertion hole 24a is formed in the core 5a, and a permanent magnet 24 forming a magnetic pole is embedded in the magnet insertion hole 24a. Further, the rotor 5 has an upper balance weight 25a and a lower balance weight 25b at both ends in the axial direction of the core 5a. The upper balance weight 25a and the lower balance weight 25b have a role of canceling the centrifugal force generated around the crankshaft 104 during eccentric rotation in the compression element 102. The upper balance weight 25a and the lower balance weight 25b also serve as end plates that support the permanent magnet 24 so that it does not fall out of the magnet insertion hole 24a. The end plate may be composed of parts separate from the upper balance weight 25a and the lower balance weight 25b.

A rivet insertion hole 26a penetrating in the axial direction is formed in the core 5a, the upper balance weight 25a, and the lower balance weight 25b, and the rivet 26 is inserted into the rivet insertion hole 26a to fasten the entire rotor in the axial direction. ing.

Further, the core 5a, the upper balance weight 25a, and the lower balance weight 25b are formed with a refrigerant flow path 27 penetrating in the axial direction. The refrigerant flow path 27 guides the refrigerant gas discharged from the compression element 102 to the upper part of the closed container 101, and drops the refrigerating machine oil guided to the upper part of the closed container 101 together with the refrigerant gas to the lower part of the closed container 101. Have a role. Further, a gap is formed between the outer peripheral surface of the stator 1 and the inner peripheral surface of the closed container 101 to communicate the upper part and the lower part of the closed container 101 to form a refrigerant flow path, and the refrigerant flow path 27 is formed. Has a similar role to.

The crankshaft 104 is formed between a long shaft portion 104a forming an upper portion of the crankshaft 104, a short shaft portion 104b forming a lower portion of the crankshaft 104, and these long shaft portions 104a and a short shaft portion 104b. It is composed of an eccentric shaft portion 104c. The central axis of the eccentric shaft portion 104c is eccentric by a predetermined distance from the central axes of the long shaft portion 104a and the short shaft portion 104c. The eccentric shaft portion 104c is arranged in the cylinder chamber 108 described later of the compression element 102, and has a configuration in which the eccentric shaft portion 104c rotates eccentrically in the cylinder chamber 108.

The compression element 102 includes a cylinder 105, a rolling piston 109, a vane (not shown), and the like. The cylinder 105 is made of a flat plate, and a substantially cylindrical through hole is formed through the substantially cylindrical through hole in the axial direction. Both ends of the through hole in the axial direction are closed by the main bearing 106 and the sub bearing 107, and a cylindrical cylinder chamber 108 is formed in the cylinder 105. A rolling piston 109 is arranged in the cylinder 105 chamber.

The rolling piston 109 is formed in an annular shape and is slidably provided on the eccentric shaft portion 104c of the crankshaft 104. Further, the cylinder 105 is formed with a groove extending in the radial direction, and a vane (not shown) is housed in the groove so as to reciprocate in the radial direction. When the tip of the vane comes into contact with the outer peripheral portion of the rolling piston 109, the cylinder chamber 108 is divided into a suction chamber and a compression chamber.

One end of the suction connecting pipe 128 provided through the closed container 101 inside the closed container 101 is connected to the cylinder 105, and the suction muffler 127 is connected to the other end of the suction connecting pipe 128 outside the closed container 101. ing. The suction muffler 127 is arranged adjacent to the closed container 101, and communicates with the suction chamber in the cylinder chamber 108 by a suction connecting pipe 128. The suction muffler 127 has a role as an accumulator for storing the liquid refrigerant and a role for eliminating the refrigerant noise.

The cylinder 105 is further provided with a discharge port (not shown) for discharging the refrigerant compressed in the compression chamber of the cylinder chamber 108 from the cylinder chamber 108. A discharge muffler 110 is attached so as to cover the discharge port. A discharge port 110a is formed in the discharge muffler 110.

In the compression element 102 configured in this way, when electric power is supplied to the electric motor 103, the crankshaft 104 is rotated by the electric motor 103. As the crankshaft 104 rotates, the eccentric shaft portion 104c moves eccentrically in the cylinder 105.

With the eccentric rotational movement of the eccentric shaft portion 104c, the rolling piston 109 eccentric rotationally moves in the cylinder 105. As the rolling piston 109 rotates, the suction chamber into which the refrigerant gas is sucked turns into a compression chamber, and the volume of the compression chamber is gradually reduced to compress the refrigerant. The compressed refrigerant gas is discharged into the discharge muffler 110 from the discharge port (not shown) of the cylinder 105, and is discharged into the internal space of the closed container 101 from the discharge port 110a formed in the discharge muffler 110. The refrigerant gas discharged into the internal space of the closed container 101 passes through the electric motor 103 and is sent out from the discharge pipe 129 to the refrigeration cycle device.

Here, as an example of the closed type compressor, a rotary type compressor is shown as an example, but the compression structure of the closed type compressor such as a scroll type or a reciprocating type in which the electric motor is arranged in the closed container does not matter. ..

The first embodiment is characterized by the structure of the stator 1. Hereinafter, prior to explaining the structure of the stator 1, the magnetic flux density in the stator core 10 during operation of the electric motor 103 will be described.

FIG. 2 is a diagram showing a magnetic flux image in the stator core. In FIG. 2, the arrow indicates the magnetic flux.
The stator core plate 11 constituting the stator core 10 is composed of an arcuate core back portion 12 and a teeth portion 13 formed so as to project from the core back portion 12 in the axial direction of the stator 1. .. In the stator core plate 11, the tooth portion 13 has a higher magnetic flux density than the core back portion 12 as shown in FIG. In the first embodiment, the tooth portion 13 having a high magnetic flux density is not provided with a caulking portion, and the caulking portion is provided in a low magnetic flux density region (a portion surrounded by a dotted line in FIG. 2) having a low magnetic flux density. The configuration of the caulking portion will be described later. In this way, by not providing the caulking portion in the tooth portion 13 having a high magnetic flux density, the motor efficiency is improved by reducing the iron loss.

Further, the first embodiment has a structure capable of suppressing the expansion of the partial thickness difference and the space factor difference in the stator core 10 caused by not providing the caulking portion in the tooth portion 13. It is a feature. Hereinafter, the structure of this feature portion will be described.

FIG. 3 is an exploded perspective view of the rotor core of the stator of the closed compressor according to the first embodiment of the present invention. FIG. 4 is an enlarged perspective view of a protruding portion of the rotor core of the stator of the sealed compressor according to the first embodiment of the present invention. FIG. 5 is a diagram showing a rotor core of a stator of a closed compressor according to the first embodiment of the present invention. FIG. 5A is a plan view. FIG. 5B is an end view cut by AA of FIG. 5A. FIG. 5 (c) is an end view cut by BB of (a). FIG. 5D is an end view cut at CC in FIG. 5A. FIG. 5 (e) is an end view cut by DD of (a). FIG. 6 is an enlarged view of the portion surrounded by the dotted line in FIG. 5 (b). FIG. 7 is an enlarged view of FIG. 5 (c). FIG. 8 is an enlarged view of FIG. 5 (d). FIG. 9 is an enlarged view of FIG. 5 (e).

As described above, the stator core 10 has a structure in which a plurality of stator core plates 11 are laminated. As shown in FIG. 3, the stator core plate 11 has two patterns of a stator core plate 11a and a stator core plate 11b, and the stator core plate 11a and the stator core plate 11b have a protruding portion 21 described later. And the penetrating portion 22 are formed at different positions. In FIG. 3, in order to visually distinguish the protruding portion 21 and the penetrating portion 22, the protruding portion 21 is shown by a dotted line and the penetrating portion 22 is shown by a solid line. The stator core 10 has a structure in which the stator core plate 11a and the stator core plate 11b are alternately laminated, and the stator core plate 11c is laminated at the most end. Hereinafter, when the stator core plates 11a to 11c are not distinguished, they are collectively referred to as the stator core plate 11.

The stator core plate 11a and the stator core plate 11b each have a core back portion 12 formed with a protruding portion 21 and a penetrating portion 22 which is a through hole. As shown in FIG. 4, the projecting portion 21 has a shape in which a part of the stator core plate 11 is cut and raised. That is, two notches 21a are made in the stator core plate 11a at intervals, and a portion located between the two notches 21a is cut up in a direction orthogonal to the surface direction of the stator core plate 11. A protruding portion 21 is formed. The protruding portion 21 is composed of a pair of inclined surfaces 21b at both ends in the direction in which the notch 21a extends, and a connecting surface 21c between the pair of inclined surfaces 21b.

The projecting portion 21 and the penetrating portion 22 are arranged at symmetrical positions about the center line 10a of the stator core plate 11. In the stator core plate 11a and the stator core plate 11b, the protruding portion 21 and the penetrating portion 22 are in a misaligned positional relationship. That is, the through portion 22 is arranged in the stator core plate 11b at the position where the protrusion 21 is arranged in the stator core plate 11a. Further, the protrusion 21 is arranged on the stator core plate 11b at the position where the penetrating portion 22 is arranged on the stator core plate 11a. Therefore, by alternately laminating the stator core plate 11a and the stator core plate 11b, the protruding portion 21 and the penetrating portion 22 are alternately positioned in the stacking direction. In the stator core plate 11c at the end, a through hole 23 is formed in each of the stator core plate 11a and the stator core plate 11b where the protrusion 21 and the penetration portion 22 are arranged.

In this way, the protruding portions 21 and the penetrating portions 22 are alternately positioned in the stacking direction, and the protruding portions 21 are press-fitted into the penetrating portions 22 of the stator core plate 11 stacked on the tip side of the protruding portions 21. By fitting them together, they are caulked and the stator core plates 11 are connected to each other. In the following, the portion of the two stator core plates 11 that are caulked by one protruding portion 21 and the other penetrating portion 22 is referred to as a caulking portion 20A, and the entire caulking portion 20A configured in the stacking direction is referred to as a caulking portion 20A. When pointing, it is referred to as the laminated caulking portion 20. In this example, as shown in FIG. 5, the core back portion 12 is configured with four laminated caulking portions 20.

Here, the fitting portion of the protruding portion 21 to the penetrating portion 22 in the crimped portion 20A will be described. As for the fitting portion of the protruding portion 21 to the penetrating portion 22, specifically, as shown in FIGS. 8 and 9, the cut end surface 21A of the protruding portion 21 is the inner peripheral surface of the penetrating portion 22 on the tip end side of the protruding portion 21. It is caulked by fitting into. That is, the portion of the protruding portion 21 that acts on the caulking bond is the cut end surface 21A of the protruding portion 21.

The above is the structure when the caulked portion 20A is viewed in the radial direction of the stator 1 (vertical direction in FIG. 5 (a)). Next, the circumferential direction of the stator 1 (FIG. 5 (a)). ) In the left-right direction), the structure when viewed in cross section will be described.

FIG. 10 is an enlarged view of a portion surrounded by a dotted line in FIG. 6, which is an enlarged cross-sectional view when the caulked portion is viewed in a circumferential cross section.
FIG. 10 shows a state in which the protruding portion 21 formed on the stator core plate 11b is caulked to the penetrating portion 22 formed on the stator core plate 11b. As described above, the portion of the protruding portion 21 that acts on the caulking bond is the cut end surface 21A (see FIG. 4) of the protruding portion 21, and the other surface of the protruding portion 21 does not contribute to the caulking bond and penetrates. It has a structure that does not come into contact with the inner surface of the portion 22. That is, the protruding portion 21 has a structure that satisfies all of the following conditions.

W>X> 0, W>Y> 0, plate thickness of stator core plate 11> Z ≧ 0
here,
W: Width of the penetrating portion 22 in the circumferential direction (horizontal direction in FIG. 10) X: Width of the penetrating portion 22 in the circumferential direction One of the flat portions 21d at both ends of the protruding portion 21 in the circumferential direction ( Width Y of flat portion (left side in FIG. 10): Flatness of the other (right side in FIG. 10) of flat portions 21d at both ends of the protruding portion 21 in the circumferential direction within the width W in the circumferential direction of the penetrating portion 22. Width Z: The length obtained by subtracting the length of the protruding portion 21 into the penetrating portion 22 of the stator core plate 11 overlapped on the protruding side of the protruding portion 21 from the plate thickness of the stator core plate 11.

As described above, in the caulking portion 20A, the cut end surface 21A of the protruding portion 21 is press-fitted into the penetrating portion 22 and caulked, while the other surfaces of the protruding portion 21 do not come into contact with the inner surface of the penetrating portion 22. It is located in the penetration portion 22. Therefore, the other surfaces of the protruding portion 21 do not interfere with the stator core plate 11 adjacent in the stacking direction. That is, the spring bag does not occur when the protruding portion 21 is press-fitted into the penetrating portion 22, and no gap is generated between the stator core plates 11. This state is shown in FIG. 11 below.

FIG. 11 is a cross-sectional view taken along the center line of the rotor core of the stator of the sealed compressor according to the first embodiment of the present invention.
The plurality of stator core plates 11 are in a state of being caulked to each other by the caulking portion 20A, and both the teeth portion 13 side where the caulking portion 20A is not provided and the core back portion 12 side where the caulking portion 20A is provided are shown in the figure. As shown in No. 11, they are laminated without gaps. Therefore, when the teeth portion 13 is wound through the insulator 3, there is no difference between the thickness t1 of the core back portion 12 and the thickness t2 of the teeth portion 13, and the thickness is the same. That is, even if the teeth portion 13 is not provided with the caulking portion 20A, it is possible to prevent a partial thickness difference and space ratio difference from occurring in the stator core 10. As a result, the alignment of the windings can be ensured and the yield can be improved. Further, by ensuring the alignment of the windings, it is possible to increase the number of fine wires of the windings and the number of windings of the windings, and it is possible to realize an electric motor with high efficiency and high winding quality.

In the stator core 10 of the first embodiment, the number of the crimped portions 20A in all the laminated caulking portions 20 at the four locations is approximately the number obtained by dividing the number of laminated core plates 11 by 2. It is the total number of 4 which is the number of caulking portions 20. Therefore, the conventional structure in which the protrusions provided on each of the stator core plates are caulked to the back surface side of the protrusions of the stator core plate overlapped on the tip end side of the protrusions, and the first embodiment. Comparing with the stator core 10, the following can be said. That is, the stator core 10 of the first embodiment has substantially the same number of caulking portions as the conventional structure in which two laminated caulking portions are provided on the teeth portion. Therefore, in the first embodiment, it is possible to obtain the stator core 10 which can prevent the difference in product thickness and the difference in space factor from occurring while maintaining the same caulking bonding force as the conventional structure.

In the first embodiment, the protrusion 21 is composed of a pair of inclined surfaces 21b and a connecting surface 21c between the pair of inclined surfaces 21b, but the surface shape of the protruding portion 21 is different. It is not limited to the shape shown in the figure.

Embodiment 2.
The second embodiment relates to an embodiment in which the caulking bonding force is improved as compared with the first embodiment. Hereinafter, the configuration in which the second embodiment is different from the first embodiment will be mainly described. The configuration not described in the second embodiment is the same as that of the first embodiment.

FIG. 12 is an exploded perspective view of the rotor core of the stator of the closed compressor according to the second embodiment of the present invention. FIG. 13 is a diagram showing a rotor core of a stator of a closed compressor according to a second embodiment of the present invention. FIG. 13A is a plan view. 13 (b) is an end view cut by AA of (a). 13 (c) is an end view cut by BB of (a). 13 (d) is an end view cut by CC of (a). FIG. 13 (e) is an end view cut by DD of (a). 13 (f) is an end view cut by EE of (a). FIG. 14 is an enlarged view of the portion surrounded by the dotted line in FIG. 13 (b). FIG. 15 is an enlarged view of FIG. 13 (c). FIG. 16 is an enlarged view of FIG. 13 (d). FIG. 17 is an enlarged view of FIG. 13 (e). FIG. 18 is an enlarged view of FIG. 13 (f).

In the first embodiment, there are four laminated caulking portions 20, but in the second embodiment, there are six laminated caulking portions 20. Then, in the stator core 10 of the second embodiment, the stator core plate 11A, the stator core plate 11B, and the stator core plate 11B are laminated one by one in an arbitrary order in an arbitrary number of sheets. And, it has a structure in which two stator core plates 11D are laminated at the most end. Hereinafter, when the stator core plates 11A to 11D are not distinguished, they are collectively referred to as the stator core plate 11.

Each of the stator core plate 11A, the stator core plate 11B, and the stator core plate 11C is formed with a protruding portion 21 and a penetrating portion 22 in the core back portion 12. The shape of the protruding portion 21 is the same as that in FIG. In any of the stator core plate 11A, the stator core plate 11B and the stator core plate 11C, the projecting portion 21 and the penetrating portion 22 are arranged at symmetrical positions about the center line 10a of the stator core plate 11. ing.

Assuming that two projecting portions 21 symmetrical about the center line 10a are set as one set, one set of projecting portions 21 is formed on the stator core plate 11. Further, assuming that two penetrating portions 22 symmetrical about the center line 10a are set as one set, two sets of penetrating portions 22 are formed. Then, in each of the stator core plate 11A, the stator core plate 11B, and the stator core plate 11C, the combination of the positions of the protruding portion 21 and the penetrating portion 22 is different from each other. Therefore, the structure is as follows by stacking the stator core plate 11A, the stator core plate 11B, and the stator core plate 11B one by one. That is, a portion in which the protrusion 21 and the penetrating portion 22 are misplaced with each other and a portion in which the penetrating portions 22 overlap each other in the laminating direction are formed between the stator core plates 11 adjacent to each other in the laminating direction. It becomes a structure. The two endmost stator core plates 11D have through holes 23 in the stator core plates 11a and the like where the protrusions 21 and the through portions 22 are arranged.

Then, in any three stator core plates 11 that overlap in the stacking direction, a caulking portion 20A is formed at a portion where the protruding portion 21 and the two penetrating portions 22 overlap in the laminating direction, and the two caulking portions 20A are the center lines. It is symmetrically configured around 10a.

Here, the fitting portion of the protruding portion 21 in the caulking portion 20A to the two penetrating portions 22 will be described. The fitting portion of the protruding portion 21 to the two penetrating portions 22 is specifically the cut end surface 21A of the protruding portion 21 as shown in FIGS. 16 to 18. That is, the cut end surface 21A is fitted to the inner peripheral surfaces of the penetrating portions 22 of the stator core plate 11 and the next stator core plate 11 which are overlapped on the protruding side of the protruding portion 21, and is caulked. To be combined.

The above is the structure when the caulked portion 20A is viewed in the radial direction of the stator 1 (vertical direction in FIG. 13 (a)). Next, the circumferential direction of the stator 1 (FIG. 13 (b)). ) In the left-right direction), the structure when viewed in cross section will be described.

FIG. 19 is an enlarged view of a portion surrounded by a dotted line in FIG. 14, which is an enlarged cross-sectional view when the caulked portion is viewed in a circumferential cross section.
FIG. 19 shows a state in which the protruding portion 21 formed on the stator core plate 11B is caulked to the penetrating portion 22 formed on the stator core plate 11C and the stator core plate 11A. As described above, the portion of the protruding portion 21 that acts on the caulking bond is the cut end surface 21A of the protruding portion 21. Therefore, the other surfaces of the protruding portion 21 do not contribute to caulking, and have a structure that does not contact the inner surfaces of the penetrating portions 22 of the stator core plate 11C and the stator core plate 11D. That is, the protruding portion 21 has a structure that satisfies all of the following conditions.

W>X> 0, W>Y> 0, plate thickness of stator core plate 11> Z ≧ 0
here,
W: Width of the penetrating portion 22 in the circumferential direction (horizontal direction in FIG. 19) X: Width of the penetrating portion 22 in the circumferential direction One of the flat portions 21d at both ends of the protruding portion 21 in the circumferential direction ( Width of flat portion (left side in FIG. 19) Y: Flat portion of the other (right side in FIG. 19) of flat portions 21d at both ends of the protruding portion 21 in the circumferential direction, which fits within the width W of the penetrating portion 22 in the circumferential direction. Width Z: The length at which the protruding portion 21 enters the penetrating portion 22 of the second stator core plate 11 overlapped on the protruding side of the protruding portion 21 is subtracted from the plate thickness of the stator core plate 11. length.

According to the second embodiment, the same effect as that of the first embodiment can be obtained, and the following effects can be obtained. That is, since the protruding portion 21 is press-fitted into the penetrating portion 22 of the two stator core plates 11, the cross-sectional area where the protruding portion 21 is press-fitted is improved, and the caulking bonding force can be improved.

1 Stator, 3 Insulator, 4 Coil, 5 Rotator, 5a Core, 9 Lead Wire, 10 Stator Core, 10a Center Line, 11 Stator Core Plate, 11A Stator Core Plate, 11B Stator Core Plate, 11C Stator Child core plate, 11D stator core plate, 11a stator core plate, 11b stator core plate, 11c stator core plate, 12 core back part, 13 teeth part, 20 laminated caulking part, 20A caulking part, 21 protruding part, 21A Notch end face, 21a Notch, 21b Inclined surface, 21c Connecting surface, 21d Flat part, 22 Penetration part, 23 Through hole, 24 Permanent magnet, 24a Magnet insertion hole, 25a Upper balance weight, 25b Lower balance weight, 26 Rivets, 26a Rivet insertion hole, 27 refrigerant flow path, 101 closed container, 101a upper container, 101b lower container, 102 compression element, 103 electric motor, 104 crank shaft, 104a long shaft part, 104b short shaft part, 104c eccentric shaft part, 105 cylinder, 106 Main shaft, 107 Sub-branch, 108 Cylinder chamber, 109 Rolling piston, 110 Discharge muffler, 110a Discharge port, 119 Glass terminal, 127 Suction muffler, 128 Suction connection pipe, 129 Discharge pipe, 130 Sealed compressor.

The stator of the electric motor according to the present invention is a stator of an electric motor having a stator core formed by laminating a plurality of stator core plates having a core back portion and a teeth portion, in which the stator core plates are connected to each other. , The stator core plate is connected to each other by a caulking portion provided on the core back portion, and the portion located between the two notches made in the stator core plate is orthogonal to the surface direction of the stator core plate. It is provided with a protruding portion having a shape cut up in the direction of the stator and a penetrating portion penetrating the stator core plate, and the protruding portion and the penetrating portion are misplaced with each other between the stator core plates adjacent to each other in the stacking direction. The two notched end faces of the protruding portion are press-fitted into the penetrating portion of the stator core plate overlapped on the tip end side of the protruding portion to form a caulking portion, while the surfaces other than the two notched end faces are formed. by positioned in the through portion without contacting the inner surface of the through portion, the stator core plates to each other have a laminated structure with no gap, the length that has entered the projecting portion in the through portion the tip of the projecting portion is located The length Z obtained by subtracting from the plate thickness of the stator core plate is more than 0 and less than the plate thickness of the stator core plate .

It is the schematic sectional drawing of the closed type compressor in Embodiment 1 of this invention. It is a figure which shows the magnetic flux image in a stator core. It is an exploded perspective view of the stator core of the stator of the closed type compressor in Embodiment 1 of this invention. It is an enlarged perspective view of the protrusion of the stator core of the stator of the stator of the closed type compressor in Embodiment 1 of this invention. It is a figure which shows the stator core of the stator of the closed type compressor in Embodiment 1 of this invention. It is an enlarged view of the part surrounded by the dotted line of FIG. 5 (b). It is an enlarged view of FIG. 5 (c). It is an enlarged view of FIG. 5 (d). It is an enlarged view of FIG. 5 (e). It is an enlarged view of the part surrounded by the dotted line of FIG. It is an end view at the center line of the stator core of the stator of the closed type compressor in Embodiment 1 of this invention. It is an exploded perspective view of the stator core of the stator of the closed type compressor in Embodiment 2 of this invention. It is a figure which shows the stator core of the stator of the closed type compressor in Embodiment 2 of this invention. It is an enlarged view of the part surrounded by the dotted line of FIG. 13B. It is an enlarged view of FIG. 13 (c). It is an enlarged view of FIG. 13 (d). It is an enlarged view of FIG. 13 (e). It is an enlarged view of FIG. 13 (f). It is an enlarged view of the part surrounded by the dotted line of FIG.

FIG. 3 is an exploded perspective view of the stator core of the stator of the sealed compressor according to the first embodiment of the present invention. FIG. 4 is an enlarged perspective view of a protruding portion of the stator core of the stator of the sealed compressor according to the first embodiment of the present invention. FIG. 5 is a diagram showing a stator core of a stator of a closed compressor according to the first embodiment of the present invention. FIG. 5A is a plan view. FIG. 5B is an end view cut by AA of FIG. 5A. FIG. 5 (c) is an end view cut by BB of (a). FIG. 5D is an end view cut at CC in FIG. 5A. FIG. 5 (e) is an end view cut by DD of (a). FIG. 6 is an enlarged view of the portion surrounded by the dotted line in FIG. 5 (b). FIG. 7 is an enlarged view of FIG. 5 (c). FIG. 8 is an enlarged view of FIG. 5 (d). FIG. 9 is an enlarged view of FIG. 5 (e).

FIG. 10 is an enlarged view of the portion surrounded by the dotted line in FIG. 6, which is an enlarged end view when the caulked portion is viewed in a circumferential cross section.
FIG. 10 shows a state in which the protruding portion 21 formed on the stator core plate 11b is caulked to the penetrating portion 22 formed on the stator core plate 11b. As described above, the portion of the protruding portion 21 that acts on the caulking bond is the cut end surface 21A (see FIG. 4) of the protruding portion 21, and the other surface of the protruding portion 21 does not contribute to the caulking bond and penetrates. It has a structure that does not come into contact with the inner surface of the portion 22. That is, the protruding portion 21 has a structure that satisfies all of the following conditions.

FIG. 11 is an end view of the stator core of the stator of the closed compressor according to the first embodiment of the present invention at the center line.
The plurality of stator core plates 11 are in a state of being caulked to each other by the caulking portion 20A, and both the teeth portion 13 side where the caulking portion 20A is not provided and the core back portion 12 side where the caulking portion 20A is provided are shown in the figure. As shown in No. 11, they are laminated without gaps. Therefore, when the teeth portion 13 is wound through the insulator 3, there is no difference between the thickness t1 of the core back portion 12 and the thickness t2 of the teeth portion 13, and the thickness is the same. That is, even if the teeth portion 13 is not provided with the caulking portion 20A, it is possible to prevent a partial thickness difference and space ratio difference from occurring in the stator core 10. As a result, the alignment of the windings can be ensured and the yield can be improved. Further, by ensuring the alignment of the windings, it is possible to increase the number of fine wires of the windings and the number of windings of the windings, and it is possible to realize an electric motor with high efficiency and high winding quality.

FIG. 12 is an exploded perspective view of the stator core of the stator of the sealed compressor according to the second embodiment of the present invention. FIG. 13 is a diagram showing a stator core of the stator of the sealed compressor according to the second embodiment of the present invention. FIG. 13A is a plan view. 13 (b) is an end view cut by AA of (a). 13 (c) is an end view cut by BB of (a). 13 (d) is an end view cut by CC of (a). FIG. 13 (e) is an end view cut by DD of (a). 13 (f) is an end view cut by EE of (a). FIG. 14 is an enlarged view of the portion surrounded by the dotted line in FIG. 13 (b). FIG. 15 is an enlarged view of FIG. 13 (c). FIG. 16 is an enlarged view of FIG. 13 (d). FIG. 17 is an enlarged view of FIG. 13 (e). FIG. 18 is an enlarged view of FIG. 13 (f).

FIG. 19 is an enlarged view of the portion surrounded by the dotted line in FIG. 14, and is an enlarged end view when the crimped portion is viewed in a circumferential cross section.
FIG. 19 shows a state in which the protruding portion 21 formed on the stator core plate 11B is caulked to the penetrating portion 22 formed on the stator core plate 11C and the stator core plate 11A. As described above, the portion of the protruding portion 21 that acts on the caulking bond is the cut end surface 21A of the protruding portion 21. Therefore, the other surfaces of the protruding portion 21 do not contribute to caulking, and have a structure that does not contact the inner surfaces of the penetrating portions 22 of the stator core plate 11C and the stator core plate 11D. That is, the protruding portion 21 has a structure that satisfies all of the following conditions.

Claims (4)

In a stator of an electric motor having a stator core formed by laminating a plurality of stator core plates having a core back portion and a teeth portion.
The stator core plates are connected to each other by a caulking portion provided on the core back portion.
The stator core plate has a protrusion having a shape in which a portion located between two notches made in the stator core plate is cut out in a direction orthogonal to the surface direction of the stator core plate, and the fixing portion. The stator core plate is provided with a penetrating portion penetrating the child core plate, and the protruding portion and the penetrating portion are in a positional relationship in which the stator core plates adjacent to each other in the stacking direction are misplaced with each other.
The two cut end faces of the protruding portion are press-fitted into the penetrating portion of the stator core plate overlapped on the tip end side of the protruding portion to form the crimped portion, while surfaces other than the two cut end faces. However, the stator of the electric motor has a structure in which the stator core plates are laminated without gaps by being located in the penetrating portion without contacting the inner surface of the penetrating portion. The stator of the electric motor according to claim 1, wherein the two protruding portions and the two penetrating portions are formed symmetrically with respect to the center line of the stator core plate, respectively. When the two protrusions symmetrical about the center line of the stator core plate are set as one set, the stator core plate has one set of protrusions.
When two sets of the penetrating portions symmetrical about the center line of the stator core plate are set as one set, the stator core plate has two sets of the penetrating portions.
The stator core plates adjacent to each other in the stacking direction have a portion in which the protruding portion and the penetrating portion are misplaced with each other, and a portion in which the penetrating portions overlap in the stacking direction.
The stator core is formed in the penetrating portion in which the protrusion of the stator core plate overlaps with the stator core plate and the next stator core plate in which the protrusion is overlapped on the tip end side of the protrusion. The stator of the electric motor according to claim 2, wherein the crimped portion is press-fitted to form the stator core plate, and the stator core plates are connected to each other. An electric motor including the stator and rotor according to any one of claims 1 to 3.

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