Stators, motors, compressors, and equipment

Abstract

The present invention provides a stator that reduces iron loss without the stator core sheet separating and that minimizes lamination differences between the back yoke and teeth sections, an electric motor that achieves high efficiency by using this stator, a compressor using this electric motor, and equipment using this compressor. [Solution] If the Nth stator core sheet 30Sn is a back yoke uneven portion 31x, then the N+1st stator core sheet 30Sn+1 is either a back yoke uneven portion 31x or a back yoke hole 31y. If the Nth stator core sheet 30Sn is a back yoke uneven portion 31x and the N+1st stator core sheet 30Sn+1 is a back yoke uneven portion 31x, then the N+2nd stator core sheet 30Sn+2 is a back yoke hole 31y. In a plan view, in the stacking direction at the same position on the back yoke portion 31, multiple stator core sheets 30S are stacked by crimping at two consecutive locations or at one location, and not at three or more locations.

Description

Technical Field

[0001] The present invention relates to a stator, an electric motor using the stator, a compressor using the electric motor, and an apparatus using the compressor.

Background Art

[0002] Patent Document 1 discloses that, among crimps provided on a core back portion and teeth portions of a stator, the crimps on the teeth portions have a portion where two or more crimps are present in the lamination direction, and a portion where two or more crimps are not present. In Patent Document 1, with such a configuration, the electromagnetic steel sheets of the stator laminated by crimping can be easily joined, and while reducing the number of crimps on the teeth portions which are greatly affected by an increase in iron loss, the opening of the teeth portions is suppressed, thereby reducing the influence on wire winding performance.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] However, in Patent Document 1, since the core back portion is crimped over the entire length in the lamination direction, iron loss increases in the core back portion. Further, since there is no blank hole in the crimped portion of the teeth portion, the core may be distorted after wire winding, resulting in lamination misalignment in the teeth portion.

[0005] An object of the present invention is to provide a stator in which stator core sheets do not separate, iron loss can be reduced, and lamination misalignment is less likely to occur between a back yoke portion and a teeth portion, an electric motor that achieves high efficiency by using the stator, a compressor using the electric motor, and an apparatus using the compressor.

Means for Solving the Problem

[0006] The stator 30 of the present invention as described in claim 1 is a stator 30 constructed by laminating a plurality of tater core sheets 30S, each having an annular back yoke portion 31 and a plurality of tooth portions 32 formed radially inward from the back yoke portion 31, wherein each tater core sheet 30S has at least one back yoke recessed hole portion 31xy formed in the back yoke portion 31 and at least one tooth recessed hole portion 32xy formed in the tooth portion 32, and the back yoke recessed hole portion 31xy has one sheet surface recessed and the other sheet surface The back yoke is a recessed portion 31x that protrudes from the sheet surface, or a back yoke hole 31y that penetrates from one sheet surface to the other sheet surface, and the teeth recessed hole 32xy is a recessed portion 32x that protrudes from the other sheet surface, or a teeth hole 32y that penetrates from one sheet surface to the other sheet surface, and the protrusion of the back yoke is crimped and joined with other back yoke recessed hole 31xy adjacent to each other in the stacking direction at the same position in a plan view, and the protrusion of the teeth recessed portion 32x As a result, in a plan view, adjacent teeth uneven holes 32xy are crimped together with other teeth uneven holes 32xy in the stacking direction at the same position, and in one of the eye tater core sheets 30S, at least one of the back yoke uneven holes 31xy and the teeth uneven holes 32xy in one of the eye tater core sheets 30S is either the back yoke hole 31y or the teeth uneven holes 32xy, so that not all of the back yoke uneven holes 31xy and the teeth uneven holes 32xy in one of the eye tater core sheets 30S are crimped together, and at any stacking position If the thetacore sheet 30S in the arrangement is the Nth thetacore sheet 30Sn, the N+1th thetacore sheet 30Sn+1, and the N+2nd thetacore sheet 30Sn+2, and the Nth thetacore sheet 30Sn, the N+1th thetacore sheet 30Sn+1, and the N+2nd thetacore sheet 30Sn+2 are stacked in order, then if the Nth thetacore sheet 30Sn is the back yoke uneven portion 31x, then the N+1th thetacore sheet 30Sn+1 is the back yoke uneven portion 31x or the back yoke hole portion 31y,If the Nth theta core sheet 30Sn is the back yoke uneven portion 31x, and the N+1th theta core sheet 30Sn+1 is the back yoke uneven portion 31x, then the N+2nd theta core sheet 30Sn+2 is the back yoke hole portion 31y, so that in a plan view, the back yoke portion 31 at the same position in the stacking direction is crimped at two consecutive locations or crimped at one location, and is not crimped at three or more locations. If the Nth theta core sheet 30Sn is the teeth uneven portion 32x, then the N+1st theta core sheet 30Sn+1 The stator core sheet 30S is characterized in that, in a plan view, multiple stator core sheets 30S are stacked such that, in the stacking direction at the same position on the teeth portion 32, they are crimped at two consecutive locations or crimped at one location, and are not crimped at three or more consecutive locations. The present invention as described in claim 2 is characterized in that, in the stator 30 described in claim 1, the back yoke portion 31 is formed by arranging a plurality of divided cores 30A, each divided into teeth portions 32, in a ring shape, and the divided core 30A consists of a divided stator core sheet 30AS having an arc-shaped yoke portion 31A and the teeth portion 32, and at least one back yoke recessed hole portion 31xy is formed in the arc-shaped yoke portion 31A of the divided stator core sheet 30AS, and at least one teeth recessed hole portion 32xy is formed in the teeth portion 32 of the divided stator core sheet 30AS. The present invention as described in claim 3 is characterized in that, in the stator 30 as described in claim 1, the protrusion dimensions from the sheet surface of the back yoke recess 31x and the teeth recess 32x are less than or equal to the sheet thickness from one sheet surface to the other sheet surface. The present invention as described in claim 4 is characterized in that, in the stator 30 described in claim 1, the protruding shape from the sheet surface of the back yoke recess 31x and the teeth recess 32x is V-shaped or flat-bottomed in a side view. The present invention as described in claim 5 is characterized in that, in the stator 30 described in claim 1, the back yoke recessed hole portion 31xy and the teeth recessed hole portion 32xy are circular or rectangular in plan view. The electric motor 14 of the present invention as described in claim 6 is an electric motor 14 using a stator 30 as described in any one of claims 1 to 5, characterized in that a rotor 20 is arranged on the inner circumference of the stator 30, slots 34 are formed between adjacent teeth portions 32, and windings are wound around the teeth portions 32. The compressor 10 of the present invention as described in claim 7 is a compressor 10 using the electric motor 14 described in claim 6, characterized in that the electric motor 14 and the compression mechanism 13 are arranged inside a sealed container 1, and the stator 30 is fixed to the sealed container 1. The apparatus of the present invention described in claim 8 is an apparatus using the compressor 10 described in claim 7, characterized in that the compressor 10, condenser 17, pressure reducing device 18, and evaporator 19 are connected in a ring shape by piping. [Effects of the Invention]

[0007] According to the present invention, a single stator core sheet has either a back yoke recess or a teeth recess for crimping, and crimping is not performed at all of the back yoke recess and teeth recess and holes. Furthermore, since there are no more than three continuous crimping joints in the stacking direction, the stator core sheet does not separate, iron loss can be reduced, and stacking differences between the back yoke and teeth portions are less likely to occur. [Brief explanation of the drawing]

[0008] [Figure 1] A compressor using an electric motor according to an embodiment of the present invention, and a diagram illustrating the configuration of equipment using this compressor. [Figure 2] Diagram showing the stator according to this embodiment. [Figure 3] Figure 2 shows the stacking state of a portion of the divided stator core sheets of the divided core shown in Figure 2. [Figure 4] Figure 3 shows the stacking state of a portion of the divided stator core sheets of a different divided core. [Figure 5] A compressor and a configuration diagram of a refrigeration system using a scroll compressor are shown, illustrating another embodiment of the system. [Modes for carrying out the invention]

[0009] The stator according to the first embodiment of the present invention has, in each stator core sheet, at least one back yoke recessed hole formed in the back yoke portion and at least one tooth recessed hole formed in the tooth portion, wherein the back yoke recessed hole is a back yoke recess formed by one sheet surface being recessed and protruding from the other sheet surface, or a back yoke hole that penetrates from one sheet surface to the other sheet surface, and the tooth recessed hole is a tooth recess formed by one sheet surface being recessed and protruding from the other sheet surface, or a tooth recess formed by one sheet surface to the other sheet surface The teeth holes penetrate the back yoke, and are crimped together with other back yoke holes adjacent to each other in the stacking direction at the same position in a plan view by the protrusion of the back yoke protrusions, and are crimped together with other teeth holes adjacent to each other in the stacking direction at the same position in a plan view by the protrusion of the teeth protrusions, and in a single stator core sheet, at least one of the back yoke holes and teeth holes in a single stator core sheet is a back yoke hole or a teeth hole, so that the back yoke holes in a single stator core sheet Not all parts and teeth uneven holes are crimped together, and the stator core sheets at any stacking position are designated as the Nth stator core sheet, the N+1th stator core sheet, and the N+2nd stator core sheet, and when the Nth stator core sheet, the N+1th stator core sheet, and the N+2nd stator core sheet are stacked in order, if the Nth stator core sheet is the back yoke uneven part, then the N+1th stator core sheet is the back yoke uneven part or back yoke hole, and if the Nth stator core sheet is the back yoke uneven part, If the N+1th stator core sheet is a back yoke groove, then the N+2nd stator core sheet is a back yoke hole, so that in a plan view, at the same position in the back yoke, the layers are crimped together at two consecutive locations in the stacking direction, or at one location, and not at three or more locations. If the Nth stator core sheet is a teeth groove, then the N+1st stator core sheet is a teeth groove or a teeth hole. If the Nth stator core sheet is a teeth groove, then the N+1st stator core sheet is a teeth groove.The N+2 stator core sheet is designed with teeth holes, so that in a plan view, multiple stator core sheets are stacked without being crimped at three or more consecutive locations in the stacking direction at the same position in the teeth section, either at two consecutive locations or at one location. According to this embodiment, each stator core sheet has either back yoke recesses or teeth recesses for crimping, and crimping is not performed at all back yoke recesses and teeth recesses. Furthermore, since there are no consecutive crimping connections at three or more locations in the stacking direction, the stator core sheets do not separate, iron loss can be reduced, and stacking differences between the back yoke and teeth sections are less likely to occur.

[0010] A second embodiment of the present invention provides a stator according to the first embodiment, wherein a back yoke portion is formed by arranging a plurality of divided cores, each divided into teeth portions, in a ring shape. The divided core consists of a divided stator core sheet having an arc-shaped yoke portion and a teeth portion. At least one back yoke recessed hole is formed in the arc-shaped yoke portion of the divided stator core sheet, and at least one teeth recessed hole is formed in the teeth portion of the divided stator core sheet. According to this embodiment, the correct lamination state can be maintained, iron loss can be reduced, lamination differences are less likely to occur between the arc-shaped yoke portion and the teeth portion, and the divided cores can be assembled into a ring shape in a well-fitting manner, thus reducing iron loss due to residual stress.

[0011] A third embodiment of the present invention is a stator according to the first embodiment, wherein the protrusion dimensions from the sheet surface at the back yoke and teeth are less than or equal to the sheet thickness from one sheet surface to the other. According to this embodiment, lamination differences are less likely to occur between the back yoke and teeth portions.

[0012] According to a fourth embodiment of the present invention, in the stator according to the first embodiment, protruding shapes from the sheet surface at the back yoke uneven portions and the tooth uneven portions are V-shaped or flat-bottomed in side view. According to the present embodiment, manufacturing is easy and caulking joining can be reliably performed.

[0013] According to a fifth embodiment of the present invention, in the stator according to the first embodiment, the back yoke uneven holes and the tooth uneven holes are circular or square in plan view. According to the present embodiment, manufacturing is easy and caulking joining can be reliably performed.

[0014] An electric motor according to a sixth embodiment of the present invention is an electric motor using the stator according to any one of the first to fifth embodiments, wherein a rotor is disposed on an inner circumference of the stator, a slot is formed between adjacent tooth portions, and a winding is wound around the tooth portions. According to the present embodiment, a highly efficient electric motor can be provided.

[0015] A compressor according to a seventh embodiment of the present invention is a compressor using the electric motor according to the sixth embodiment, wherein the electric motor and a compression mechanism are disposed in a sealed container, and the stator is fixed to the sealed container. According to the present embodiment, a compressor with high motor efficiency can be provided.

[0016] An apparatus according to an eighth embodiment of the present invention is an apparatus using the compressor according to the seventh embodiment, wherein the compressor, a condenser, a pressure reducing device, and an evaporator are annularly connected by pipes. According to the present embodiment, an apparatus with high motor efficiency and excellent compression performance can be realized. EXAMPLE

[0017] Hereinafter, a stator, an electric motor, a compressor, and an apparatus using the compressor according to examples of the present invention will be described. The present invention is not limited by the following examples.

[0018] FIG. 1 is a configuration diagram of a compressor using the electric motor according to the present embodiment, and an apparatus using this compressor. The compressor 10 according to the present embodiment is a rotary compressor. A hermetic container 1 is connected with a suction pipe 2 for sucking refrigerant and a discharge pipe 3 for discharging refrigerant. Inside the hermetic container 1, a compression mechanism unit 13 that compresses the refrigerant sucked from the suction pipe 2, and an electric motor 14 that drives the compression mechanism unit 13 are disposed. A bottom portion in the hermetic container 1 serves as an oil storage unit 11. The compression mechanism unit 13 is composed of a cylinder 13a, a piston 13b, a vane (not shown), a main bearing 13c, and a sub bearing 13d. The main bearing 13c is fixed to the hermetic container 1. The piston 13b is rotatably fitted to an eccentric portion 4a of a rotating shaft 4 penetrating the inside of the cylinder 13a. The vane reciprocates in a vane groove while following the piston 13b rolling along the inner wall surface of the cylinder 13a. The main bearing 13c and the sub bearing 13d seal the upper end surface and the lower end surface of the cylinder 13a, and support the rotating shaft 4.

[0019] The electric motor 14 includes a stator 30 fixed to the hermetic container 1, and a rotor 20 disposed on the inner periphery of the stator 30. The rotor 20 is fixed to the rotating shaft 4, and the stator 30 is fixed to the hermetic container 1. The rotor 20 is disposed with the stator 30 via an air gap. The rotor 20 has a rotor core formed into a cylindrical shape by laminating rotor core sheets, and permanent magnets disposed in slits formed in the outer peripheral portion of the rotor core. The rotor 20 has a plurality of permanent magnets arranged centered on the rotating shaft 4. The rotor core is made of a magnetic material. The refrigerant is sucked into the compression mechanism unit 13 from the suction pipe 2, and compressed by the compression mechanism unit 13. Thereafter, the refrigerant passes through the electric motor 14 and is discharged from the discharge pipe 3.

[0020] The apparatus according to the present embodiment has the compressor 10, a condenser 17, a pressure reducing device 18, and an evaporator 19 annularly connected by piping. The condenser 17 condenses the refrigerant discharged from the discharge pipe 3, the pressure reducing device 18 reduces the pressure of the refrigerant condensed by the condenser 17, and the evaporator 19 evaporates the refrigerant depressurized by the pressure reducing device 18. The refrigerant evaporated in the evaporator 19 is returned to the compressor 10 via the accumulator 16.

[0021] Figure 2 shows a stator according to this embodiment, with Figure 2(a) being a plan view of the stator and Figure 2(b) being a perspective view of the stator. In this embodiment, a stator 30 with a divided core 30A is shown. The stator 30 is constructed by stacking multiple stator core sheets 30S, each having an annular back yoke portion 31 and a plurality of teeth portions 32 formed radially inward from the back yoke portion 31. The stator 30 is constructed by stacking stator core sheets 30S in the axial direction of the rotating shaft 4. The stator core sheets 30S are electromagnetic steel sheets with a thickness of approximately 0.3 mm, and the stator 30 is made of a magnetic material. Slots 34 are formed between adjacent teeth 32. A winding (not shown) is wound around each tooth 32. Each stator core sheet 30S has at least one back yoke recessed hole 31xy and at least one tooth recessed hole 32xy. The back yoke recessed holes 31xy are formed in the back yoke portion 31, and the teeth recessed holes 32xy are formed in the teeth portion 32.

[0022] In this embodiment, the stator 30 is constructed by arranging multiple divided cores 30A, each divided into several parts for each tooth portion 32, in a ring shape. The back yoke portion 31 is formed by arranging these multiple divided cores 30A, each divided into several parts for each tooth portion 32, in a ring shape. The divided core 30A is constructed by stacking divided stator core sheets 30AS, each having an arc-shaped yoke portion 31A centered on the rotation axis 4 of the rotor 20, a tooth portion 32 extending from the arc-shaped yoke portion 31A toward the rotor 20, and an umbrella portion 33 formed at the tip of the tooth portion 32. A groove 35 is formed on the back yoke surface of the arc-shaped yoke portion 31A. The umbrella portion 33 is formed to protrude on both sides beyond the circumferential width of the teeth portion 32. The groove 35 is formed on the extension of the center line of the teeth portion 32 and is formed symmetrically with respect to the center line of the teeth portion 32.

[0023] Each segmented stator core sheet 30AS has at least one back yoke recessed hole 31xy and at least one tooth recessed hole 32xy. The back yoke recessed holes 31xy are formed in the arc-shaped yoke portion 31A, and the teeth recessed holes 32xy are formed in the teeth portion 32. In this embodiment, two back yoke recessed holes 31xy and one tooth recessed hole 32xy are formed. The two back yoke recessed holes 31xy are formed symmetrically with respect to the center line of the tooth portion 32.

[0024] Figure 3 shows the stacking state of a portion of the divided stator core sheets shown in Figure 2. Figure 3(a) is a perspective view showing the stacking state of the divided stator core sheets at an arbitrary position. Figure 3(b) is a cross-sectional view of the main part showing the uneven holes of one back yoke. Figure 3(c) is a cross-sectional view of the main part showing the uneven holes of the other back yoke. Figure 3(d) is a cross-sectional view of the main part showing the uneven holes of the teeth. Figure 3(e) is an exploded perspective view of the divided stator core sheet shown in Figure 3(a). Each segmented stator core sheet 30AS has two back yoke recessed holes 31xy formed in the arc-shaped yoke portion 31A and one tooth recessed hole 32xy formed in the tooth portion 32.

[0025] As shown in Figures 3(b) and 3(c), the back yoke recessed hole portion 31xy is either a back yoke recessed portion 31x where one sheet surface is recessed and protrudes from the other sheet surface, or a back yoke hole portion 31y that penetrates from one sheet surface to the other sheet surface. Furthermore, as shown in Figure 3(d), the toothed recessed and recessed portion 32xy is either a toothed recessed portion 32x that protrudes from the other sheet surface as a recess on one sheet surface, or a toothed hole portion 32y that penetrates from one sheet surface to the other sheet surface.

[0026] As shown in Figure 3(e), the seven divided stator core sheets 30AS at any stacking position are, respectively, the Nth stator core sheet 30Sn, the N+1st stator core sheet 30Sn+1, the N+2nd stator core sheet 30Sn+2, the N+3rd stator core sheet 30Sn+3, the N+4th stator core sheet 30Sn+4, the N+5th stator core sheet 30Sn+5, and the N+6th If we consider the stator core sheet to be 30Sn+6, then the following are stacked in order: the Nth stator core sheet 30Sn, the N+1st stator core sheet 30Sn+1, the N+2nd stator core sheet 30Sn+2, the N+3rd stator core sheet 30Sn+3, the N+4th stator core sheet 30Sn+4, the N+5th stator core sheet 30Sn+5, and the N+6th stator core sheet 30Sn+6.

[0027] The Nth stator core sheet 30Sn has one back yoke recessed hole 31xy as the back yoke recessed portion 31x, the other back yoke recessed hole 31xy as the back yoke hole 31y, and the teeth recessed hole 32xy as the teeth recessed portion 32x. Therefore, one of the back yoke grooves 31xy in the Nth stator core sheet 30Sn is crimped and joined to the other back yoke groove 31xy in the N+1th stator core sheet 30Sn+1. Furthermore, the tooth-shaped grooves 32xy in the Nth stator core sheet 30Sn are crimped together with the tooth-shaped grooves 32xy in the N+1th stator core sheet 30Sn+1. However, the other back yoke recessed hole portion 31xy in the Nth stator core sheet 30Sn is not crimped to the other back yoke recessed hole portion 31xy in the N+1th stator core sheet 30Sn+1.

[0028] The N+1 stator core sheet 30Sn+1 has one back yoke recessed hole 31xy designated as the back yoke recessed hole 31x, the other back yoke recessed hole 31xy designated as the back yoke recessed hole 31x, and the teeth recessed hole 32xy designated as the teeth hole 32y. Therefore, one of the back yoke grooves 31xy in the N+1th stator core sheet 30Sn+1 is crimped and joined to the other back yoke groove 31xy in the N+2nd stator core sheet 30Sn+2. Furthermore, the other back yoke recessed hole portion 31xy in the N+1 stator core sheet 30Sn+1 is crimped and joined to the other back yoke recessed hole portion 31xy in the N+2 stator core sheet 30Sn+2. However, the tooth-shaped grooves 32xy in the N+1th stator core sheet 30Sn+1 are not crimped together with the tooth-shaped grooves 32xy in the N+2nd stator core sheet 30Sn+2.

[0029] The N+2 stator core sheet 30Sn+2 has one back yoke recessed hole 31xy designated as the back yoke hole 31y, the other back yoke recessed hole 31xy designated as the back yoke recessed portion 31x, and the teeth recessed hole 32xy designated as the teeth recessed portion 32x. Therefore, the other back yoke recessed hole portion 31xy in the N+2 stator core sheet 30Sn+2 is crimped and joined to the other back yoke recessed hole portion 31xy in the N+3 stator core sheet 30Sn+3. Furthermore, the tooth-shaped grooves 32xy in the N+2 stator core sheet 30Sn+2 are crimped and joined to the tooth-shaped grooves 32xy in the N+3 stator core sheet 30Sn+3. However, one of the back yoke grooves 31xy in the N+2 stator core sheet 30Sn+2 is not crimped to the other back yoke groove 31xy in the N+3 stator core sheet 30Sn+3.

[0030] The N+3 stator core sheet 30Sn+3 has one back yoke recessed hole 31xy designated as the back yoke recessed portion 31x, the other back yoke recessed hole 31xy designated as the back yoke hole 31y, and the teeth recessed hole 32xy designated as the teeth recessed portion 32x. Therefore, one of the back yoke recessed holes 31xy in the N+3 stator core sheet 30Sn+3 is crimped and joined to the other back yoke recessed hole 31xy in the N+4 stator core sheet 30Sn+4. Furthermore, the tooth-shaped grooves 32xy in the N+3 stator core sheet 30Sn+3 are crimped and joined to the tooth-shaped grooves 32xy in the N+4 stator core sheet 30Sn+4. However, the other back yoke recessed hole portion 31xy in the N+3 stator core sheet 30Sn+3 is not crimped to the other back yoke recessed hole portion 31xy in the N+4 stator core sheet 30Sn+4.

[0031] The N+4th stator core sheet 30Sn+4 has one back yoke recessed hole 31xy designated as the back yoke recessed hole 31x, the other back yoke recessed hole 31xy designated as the back yoke recessed hole 31x, and the teeth recessed hole 32xy designated as the teeth hole 32y. Therefore, one of the back yoke grooves 31xy in the N+4th stator core sheet 30Sn+4 is crimped and joined to the other back yoke groove 31xy in the N+5th stator core sheet 30Sn+5. Furthermore, the other back yoke recessed hole portion 31xy in the N+4th stator core sheet 30Sn+4 is crimped and joined to the other back yoke recessed hole portion 31xy in the N+5th stator core sheet 30Sn+5. However, the tooth-shaped grooves 32xy in the N+4th stator core sheet 30Sn+4 are not crimped together with the tooth-shaped grooves 32xy in the N+5th stator core sheet 30Sn+5.

[0032] The N+5th stator core sheet 30Sn+5 has one back yoke recessed hole 31xy designated as the back yoke hole 31y, the other back yoke recessed hole 31xy designated as the back yoke recessed portion 31x, and the teeth recessed hole 32xy designated as the teeth recessed portion 32x. Therefore, the other back yoke recessed hole portion 31xy in the N+5th stator core sheet 30Sn+5 is crimped and joined to the other back yoke recessed hole portion 31xy in the N+6th stator core sheet 30Sn+6. Furthermore, the tooth-shaped grooves 32xy in the N+5th stator core sheet 30Sn+5 are crimped and joined to the tooth-shaped grooves 32xy in the N+6th stator core sheet 30Sn+6. However, one of the back yoke grooves 31xy in the N+5th stator core sheet 30Sn+5 is not crimped to the other back yoke groove 31xy in the N+6th stator core sheet 30Sn+6.

[0033] In this way, each adjacent segmented stator core sheet 30AS is crimped and joined to other back yoke recessed holes 31xy adjacent to each other in the stacking direction at the same position in a plan view by the protrusion of the back yoke recessed portion 31x, or crimped and joined to other teeth recessed holes 32xy adjacent to each other in the stacking direction at the same position in a plan view by the protrusion of the teeth recessed portion 32x. Furthermore, in a single segmented stator core sheet 30AS, at least one of the two back yoke recessed holes 31xy and teeth recessed holes 32xy on the single segmented stator core sheet 30AS is either a back yoke hole 31y or a teeth recessed hole 32xy, so that not all of the back yoke recessed holes 31xy and teeth recessed holes 32xy on the single segmented stator core sheet 30AS are crimped together.

[0034] Furthermore, if the Nth stator core sheet 30Sn is the back yoke uneven portion 31x, the N+1st stator core sheet 30Sn+1 can be made into the back yoke uneven portion 31x or the back yoke hole portion 31y. If the Nth stator core sheet 30Sn is the back yoke uneven portion 31x and the N+1st stator core sheet 30Sn+1 is the back yoke uneven portion 31x, the N+2nd stator core sheet 30Sn+2 can be made into the back yoke hole portion 31y. In this way, in a plan view, the stator core sheets can be crimped at two consecutive locations or at one location in the stacking direction at the same position on the arc-shaped yoke portion 31A, and not at three or more locations, allowing the divided stator core sheets 30AS to be stacked.

[0035] Furthermore, if the Nth stator core sheet 30Sn is a toothed protrusion 32x, the N+1th stator core sheet 30Sn+1 can be made into a toothed protrusion 32x or a toothed hole 32y. If the Nth stator core sheet 30Sn is a toothed protrusion 32x and the N+1th stator core sheet 30Sn+1 is a toothed protrusion 32x, the N+2nd stator core sheet 30Sn+2 can be made into a toothed hole 32y. In this way, in a plan view, the divided stator core sheets 30AS can be laminated with crimping at two consecutive locations or one location in the stacking direction at the same position on the toothed portion 32, without crimping at three or more consecutive locations.

[0036] As described above, according to this embodiment, each divided stator core sheet 30AS has either a back yoke recessed portion 31x or a teeth recessed portion 32x for crimping, and is not crimped at all points. Furthermore, since there are no more than three continuous crimping points in the stacking direction, the divided stator core sheet 30AS does not separate, maintaining the correct stacked state, reducing iron loss, preventing stacking differences between the arc-shaped yoke portion 31A and the teeth portion 32, and allowing the divided cores 30A to be assembled into a ring shape with good fit, thus reducing iron loss due to residual stress.

[0037] Figure 4 shows the stacking state of a portion of the divided stator core sheets, different from that shown in Figure 3. Figure 4(a) is a perspective view showing the stacking state of the divided stator core sheets at an arbitrary position. Figure 4(b) is a cross-sectional view of the main part showing the uneven holes of one back yoke. Figure 4(c) is a cross-sectional view of the main part showing the uneven holes of the other back yoke. Figure 4(d) is a cross-sectional view of the main part showing the uneven holes of the teeth. Figure 4(e) is an exploded perspective view of the divided stator core sheet shown in Figure 4(a). Each segmented stator core sheet 30AS has two back yoke recessed holes 31xy formed in the arc-shaped yoke portion 31A and one tooth recessed hole 32xy formed in the tooth portion 32.

[0038] As shown in Figures 4(b) and 4(c), the back yoke recessed hole portion 31xy is either a back yoke recessed portion 31x where one sheet surface is recessed and protrudes from the other sheet surface, or a back yoke hole portion 31y that penetrates from one sheet surface to the other sheet surface. Furthermore, as shown in Figure 4(d), the toothed recessed and recessed portion 32xy is either a toothed recessed portion 32x that protrudes from the other sheet surface as one sheet surface is recessed, or a toothed hole portion 32y that penetrates from one sheet surface to the other sheet surface.

[0039] As shown in Figure 4(e), the seven divided stator core sheets 30AS at any stacking position are, respectively, the Nth stator core sheet 30Sn, the N+1st stator core sheet 30Sn+1, the N+2nd stator core sheet 30Sn+2, the N+3rd stator core sheet 30Sn+3, the N+4th stator core sheet 30Sn+4, the N+5th stator core sheet 30Sn+5, and the N+6th If we consider the stator core sheet to be 30Sn+6, then the following are stacked in order: the Nth stator core sheet 30Sn, the N+1st stator core sheet 30Sn+1, the N+2nd stator core sheet 30Sn+2, the N+3rd stator core sheet 30Sn+3, the N+4th stator core sheet 30Sn+4, the N+5th stator core sheet 30Sn+5, and the N+6th stator core sheet 30Sn+6.

[0040] The Nth stator core sheet 30Sn has one back yoke recessed hole 31xy designated as the back yoke recessed hole 31x, the other back yoke recessed hole 31xy designated as the back yoke hole 31y, and the teeth recessed hole 32xy designated as the teeth hole 32y. Therefore, one of the back yoke grooves 31xy in the Nth stator core sheet 30Sn is crimped and joined to the other back yoke groove 31xy in the N+1th stator core sheet 30Sn+1. However, the other back yoke recessed hole portion 31xy in the Nth stator core sheet 30Sn is not crimped to the other back yoke recessed hole portion 31xy in the N+1th stator core sheet 30Sn+1. Furthermore, the tooth-shaped grooves 32xy in the Nth stator core sheet 30Sn are not crimped together with the tooth-shaped grooves 32xy in the N+1th stator core sheet 30Sn+1.

[0041] The N+1 stator core sheet 30Sn+1 has one back yoke recessed hole 31xy designated as the back yoke hole 31y, the other back yoke recessed hole 31xy designated as the back yoke recessed hole 31x, and the teeth recessed hole 32xy designated as the teeth hole 32y. Therefore, the other back yoke recessed hole portion 31xy in the N+1 stator core sheet 30Sn+1 is crimped and joined to the other back yoke recessed hole portion 31xy in the N+2 stator core sheet 30Sn+2. However, one of the back yoke grooves 31xy in the N+1 stator core sheet 30Sn+1 is not crimped to the other back yoke groove 31xy in the N+2 stator core sheet 30Sn+2. Furthermore, the teeth-shaped holes 32xy in the N+1 stator core sheet 30Sn+1 are not crimped together with the teeth-shaped holes 32xy in the N+2 stator core sheet 30Sn+2.

[0042] The N+2 stator core sheet 30Sn+2 has one back yoke recessed hole 31xy designated as the back yoke hole 31y, the other back yoke recessed hole 31xy designated as the back yoke hole 31y, and the teeth recessed hole 32xy designated as the teeth recessed portion 32x. Therefore, the tooth-shaped holes 32xy in the N+2th stator core sheet 30Sn+2 are crimped and joined to the tooth-shaped holes 32xy in the N+3rd stator core sheet 30Sn+3. However, one of the back yoke grooves 31xy in the N+2 stator core sheet 30Sn+2 is not crimped to the other back yoke groove 31xy in the N+3 stator core sheet 30Sn+3. Furthermore, the other back yoke recessed hole portion 31xy in the N+2 stator core sheet 30Sn+2 is not crimped and joined to the other back yoke recessed hole portion 31xy in the N+3 stator core sheet 30Sn+3.

[0043] The N+3 stator core sheet 30Sn+3 has one back yoke recessed hole 31xy designated as the back yoke recessed hole 31x, the other back yoke recessed hole 31xy designated as the back yoke hole 31y, and the teeth recessed hole 32xy designated as the teeth hole 32y. Therefore, one of the back yoke recessed holes 31xy in the N+3 stator core sheet 30Sn+3 is crimped and joined to the other back yoke recessed hole 31xy in the N+4 stator core sheet 30Sn+4. However, the other back yoke recessed hole portion 31xy in the N+3 stator core sheet 30Sn+3 is not crimped to the other back yoke recessed hole portion 31xy in the N+4 stator core sheet 30Sn+4. Furthermore, the tooth-shaped grooves 32xy in the N+3 stator core sheet 30Sn+3 are not crimped together with the tooth-shaped grooves 32xy in the N+4 stator core sheet 30Sn+4.

[0044] The N+4th stator core sheet 30Sn+4 has one back yoke recessed hole 31xy designated as the back yoke hole 31y, the other back yoke recessed hole 31xy designated as the back yoke recessed hole 31x, and the teeth recessed hole 32xy designated as the teeth hole 32y. Therefore, the other back yoke recessed hole portion 31xy in the N+4th stator core sheet 30Sn+4 is crimped and joined to the other back yoke recessed hole portion 31xy in the N+5th stator core sheet 30Sn+5. However, one of the back yoke grooves 31xy in the N+4th stator core sheet 30Sn+4 is not crimped to the other back yoke groove 31xy in the N+5th stator core sheet 30Sn+5. Furthermore, the tooth-shaped grooves 32xy in the N+4th stator core sheet 30Sn+4 are not crimped together with the tooth-shaped grooves 32xy in the N+5th stator core sheet 30Sn+5.

[0045] The N+5th stator core sheet 30Sn+5 has one back yoke recessed hole 31xy designated as the back yoke hole 31y, the other back yoke recessed hole 31xy designated as the back yoke hole 31y, and the teeth recessed hole 32xy designated as the teeth recessed portion 32x. Therefore, the tooth-shaped grooves 32xy in the N+5th stator core sheet 30Sn+5 are crimped and joined to the tooth-shaped grooves 32xy in the N+6th stator core sheet 30Sn+6. However, one of the back yoke grooves 31xy in the N+5th stator core sheet 30Sn+5 is not crimped to the other back yoke groove 31xy in the N+6th stator core sheet 30Sn+6. Furthermore, the other back yoke recessed hole portion 31xy in the N+5th stator core sheet 30Sn+5 is not crimped to the other back yoke recessed hole portion 31xy in the N+6th stator core sheet 30Sn+6.

[0046] In this way, each adjacent segmented stator core sheet 30AS is crimped and joined to other back yoke recessed holes 31xy adjacent to each other in the stacking direction at the same position in a plan view by the protrusion of the back yoke recessed portion 31x, or crimped and joined to other teeth recessed holes 32xy adjacent to each other in the stacking direction at the same position in a plan view by the protrusion of the teeth recessed portion 32x. In a single segmented stator core sheet 30AS, at least one of the two back yoke recessed holes 31xy and teeth recessed holes 32xy on the segmented stator core sheet 30AS is designated as either the back yoke recessed hole 31x or the teeth recessed hole 32x, while the other is designated as either the back yoke hole 31y or the teeth recessed hole 32xy. Therefore, there is only one crimp joint for a single segmented stator core sheet 30AS, and not all of the back yoke recessed holes 31xy and teeth recessed holes 32xy on a single segmented stator core sheet 30AS are crimped.

[0047] Furthermore, if the Nth stator core sheet 30Sn is the back yoke recessed portion 31x, then by making the N+1st stator core sheet 30Sn+1 the back yoke hole portion 31y, the sheets are crimped together at one location in the stacking direction at the same position in the arc-shaped yoke portion 31A in a plan view, and are not crimped together at two or more consecutive locations, thus allowing the divided stator core sheets 30AS to be stacked.

[0048] Furthermore, if the Nth stator core sheet 30Sn is a toothed recessed portion 32x, the N+1th stator core sheet 30Sn+1 can be made into a toothed hole portion 32y. In a plan view, the divided stator core sheets 30AS can be laminated with crimping at only one location in the stacking direction at the same position on the toothed portion 32, without being crimped at two or more consecutive locations.

[0049] As described above, according to this embodiment, each divided stator core sheet 30AS has either a back yoke recessed portion 31x or a teeth recessed portion 32x for crimping, and is not crimped at all points. Furthermore, since there are no more than three continuous crimping points in the stacking direction, the divided stator core sheet 30AS does not separate, maintaining the correct stacked state, reducing iron loss, preventing stacking differences between the arc-shaped yoke portion 31A and the teeth portion 32, and allowing the divided cores 30A to be assembled into a ring shape with good fit, thus reducing iron loss due to residual stress.

[0050] As shown in Figures 3 and 4, the protrusion dimensions from the sheet surface of the back yoke recessed portion 31x and the teeth recessed portion 32x are set to be less than or equal to the sheet thickness from one sheet surface to the other. By setting the protrusion dimensions from the sheet surface of the back yoke recessed portion 31x and the teeth recessed portion 32x to be less than or equal to the sheet thickness from one sheet surface to the other, it is less likely for a difference in lamination to occur between the arc-shaped yoke portion 31A (or back yoke portion 31) and the teeth portion 32. Furthermore, as shown in Figures 3 and 4, the protruding shape from the sheet surface of the back yoke recessed portion 31x and the teeth recessed portion 32x is preferably V-shaped in side view, but it can also be a flat-bottomed shape. By making the protruding shape from the sheet surface of the back yoke recessed portion 31x and the teeth recessed portion 32x V-shaped or flat-bottomed in side view, manufacturing is made easier and crimping can be made more reliable. Furthermore, as shown in Figures 3 and 4, it is preferable that the back yoke recessed portion 31x and the teeth recessed portion 32x be rectangular in plan view, but they can also be circular. By making the back yoke recessed portion 31x and the teeth recessed portion 32x circular or rectangular in plan view, manufacturing is made easier and crimping can be performed reliably.

[0051] Figure 5 shows a compressor and a configuration diagram of a refrigeration system using a scroll compressor, illustrating another embodiment of the compressor. The stator 30 described in Figures 2 to 4 can also be applied to the scroll compressor shown in Figure 5. The compressor 10 in this embodiment includes a compression mechanism 13 for compressing the refrigerant and an electric motor 14 for driving the compression mechanism 13, all located within a sealed container 1. The sealed container 1 is divided into one internal space and the other internal space by a compression mechanism 13. An electric motor 14 is placed in the other internal space. Furthermore, the other container space is divided by the electric motor 14 into a compression mechanism side space and an oil storage side space. The oil storage section 11 is located in the oil storage side space. A suction pipe 2 and a discharge pipe 3 are fixed to the sealed container 1 by welding. The suction pipe 2 and the discharge pipe 3 are connected to the outside of the sealed container 1 and to components that make up the refrigeration cycle. The suction pipe 2 introduces refrigerant from the outside of the sealed container 1, and the discharge pipe 3 leads the refrigerant out from one of the container's internal spaces to the outside of the sealed container 1.

[0052] The main bearing member 7a is fixed inside the sealed container 1 by welding or shrink fitting and supports the rotating shaft 4. The rotating shaft 4 is supported at one end by the main bearing member 7a and at the other end by the bearing 7b. A fixed scroll 13j is bolted to the main bearing member 7a. The orbiting scroll 13k that meshes with the fixed scroll 13j is sandwiched between the main bearing member 7a and the fixed scroll 13j. The fixed scroll 13j and the orbiting scroll 13k constitute a scroll-type compression mechanism 13. A rotational restraint mechanism 9, such as an Oldham ring, is provided between the orbiting scroll 13k and the main bearing member 7a. The rotational restraint mechanism 9 prevents the orbiting scroll 13k from rotating and guides it to move in a circular orbit. The orbiting scroll 13k is eccentrically driven by an eccentric portion 4a provided at the upper end of the rotating shaft 4. Due to this eccentric drive, the compression chamber formed between the fixed scroll 13j and the orbiting scroll 13k moves from the outer circumference of the compression mechanism 13 towards the center, reducing its volume and performing compression.

[0053] The electric motor 14 has a rotor 20 that is rotatably arranged around the rotating shaft 4, and a stator 30 that is arranged with respect to the rotor 20 via an air gap. The configuration of the stator 30 is the same as that shown in Figures 2 to 4, so its explanation is omitted.

[0054] The refrigerant is drawn in from the suction pipe 2 to the compression mechanism 13 and compressed in the compression mechanism 13. The refrigerant is then discharged from the discharge pipe 3. In this embodiment, the refrigeration system comprises a compressor 10, a condenser 17, a pressure reducing device 18, and an evaporator 19, all connected in a ring shape by piping. The condenser 17 condenses the refrigerant discharged from the discharge pipe 3, the pressure reducing device 18 reduces the pressure of the refrigerant condensed in the condenser 17, and the evaporator 19 evaporates the refrigerant reduced in pressure by the pressure reducing device 18. The refrigerant evaporated in the evaporator 19 is returned to the compressor 10 through the suction pipe 2.

[0055] The electric motor 14 according to this embodiment is suitable for a compressor 10 that connects a compression mechanism 13 to a rotating shaft 4 and compresses a refrigerant using the compression mechanism 13. In this embodiment, a vertical compressor 10 was used for the explanation, but a horizontal compressor 10 would have similar effects and is suitable for, for example, vehicle-mounted compressors. Also, while Figure 1 shows a rotary compressor and Figure 11 shows a scroll compressor, a reciprocating compressor or other types of compressors may also be used. Furthermore, in a refrigeration system having a compressor 10 using the electric motor 14 according to this embodiment, connected in a ring shape by piping together with a condenser 17, a pressure reducing device 18, and an evaporator 19, high efficiency can be achieved without reducing torque.

[0056] As described above, the compressor 10 according to this embodiment has a compression mechanism 13 connected to the rotating shaft 4, and the refrigerant is compressed by the compression mechanism 13, thus providing a compressor 10 with high motor efficiency. Furthermore, R32 and R410A can be used as refrigerants, and natural refrigerants such as R290 and CO2 can also be used. [Industrial applicability]

[0057] The compressor of the present invention is useful in equipment such as hot water heating systems, indoor air conditioning systems, vehicle-mounted air conditioning systems, water heaters, refrigerators, display cases, chillers, or refrigeration units. [Explanation of Symbols]

[0058] 1. Airtight container 2 Suction tube 3 Discharge pipe 4 rotation axes 4a Eccentric part 7a Main bearing member 7b bearing 9. Rotation restraint mechanism 10 Compressor 11 Oil storage section 13 Compression mechanism 13a Cylinder 13b Piston 13c Main bearing 13d Sub-bearing 13j Fixed Scroll 13k rotating scroll 14 Electric motor 16 Accumulator 17 Condenser 18. Pressure Reducing Device 19 Evaporator 20 rotors 30 Stator 30S Stator Core Sheet 30Sn Nth Stator Core Sheet 30Sn+1 N+1 Stator Core Sheet 30Sn+2 N+2 Stator Core Sheet 30Sn+3 N+3 Stator Core Sheet 30Sn+4 N+4th stator core sheet 30Sn+5 N+5th stator core sheet 30Sn+6 N+6th Stator Core Sheet 30A Split Core 30AS Split Stator Core Sheet 31 Back yoke section 31A Arc-shaped yoke section 31xy Back yoke recessed hole 31x Back yoke recessed area 31y Back yoke hole 32 Teeth section 32xy Teeth uneven hole part 32x Teeth unevenness 32y Teeth hole 33 Umbrella section 34 slots 35 Groove

Claims

1. A stator is constructed by stacking multiple stator core sheets, each having an annular back yoke portion and a plurality of teeth portions formed radially inward from the back yoke portion, Each of the stator core sheets has: The back yoke portion comprises at least one back yoke recessed hole, At least one tooth-shaped recessed hole is formed in the tooth portion. It has, The aforementioned back yoke recessed hole portion is a back yoke recessed portion where one sheet surface is recessed and protrudes from the other sheet surface, or a back yoke hole portion that penetrates from one sheet surface to the other sheet surface. The aforementioned toothed recessed hole portion is a toothed recessed portion that protrudes from the other sheet surface as one of the sheet surfaces is recessed, or a toothed hole portion that penetrates from one sheet surface to the other sheet surface. The protrusions of the back yoke recesses and protrusions are crimped together with other back yoke recesses and protrusions adjacent to each other in the stacking direction at the same position in a plan view. The protrusion of the aforementioned teeth-like protrusions allows for crimping and joining with other adjacent teeth-like protrusions and holes in the stacking direction at the same position in a plan view. In a single stator core sheet, at least one of the back yoke recessed holes and the teeth recessed holes in the single stator core sheet is either the back yoke hole or the teeth recessed holes, so that not all of the back yoke recessed holes and the teeth recessed holes in the single stator core sheet are crimped together. If the stator core sheets at any stacking position are defined as the Nth stator core sheet, the N+1th stator core sheet, and the N+2nd stator core sheet, and the Nth stator core sheet, the N+1th stator core sheet, and the N+2nd stator core sheet are stacked in that order, If the Nth stator core sheet is the back yoke uneven portion, the (N+1)th stator core sheet is the back yoke uneven portion or the back yoke hole; if the Nth stator core sheet is the back yoke uneven portion and the (N+1)th stator core sheet is the back yoke uneven portion, the (N+2)th stator core sheet is the back yoke hole; in a plan view, at the same position in the back yoke portion, the layers are crimped together at two consecutive locations in the stacking direction, or at one location, and not at three or more locations. If the Nth stator core sheet is the teeth-shaped protrusions, the (N+1)th stator core sheet is either the teeth-shaped protrusions or the teeth-shaped holes. If the Nth stator core sheet is the teeth-shaped protrusions and the (N+1)th stator core sheet is the teeth-shaped protrusions, the (N+2)th stator core sheet is the teeth-shaped holes. In a plan view, the layers are crimped at two consecutive locations in the stacking direction at the same position on the teeth, or crimped at one location, without being crimped at three or more consecutive locations. Multiple stator core sheets are stacked together. A stator characterized by the following features.

2. The back yoke portion is formed by arranging multiple divided cores, each divided into several parts, in a ring shape. The divided core consists of a divided stator core sheet having an arc-shaped yoke portion and the teeth portion. At least one of the back yoke recessed holes is formed in the arc-shaped yoke portion of the divided stator core sheet. At least one of the tooth-shaped protrusions and recesses is formed in the tooth portion of the divided stator core sheet. The stator according to feature 1.

3. The protrusion dimensions from the sheet surface at the back yoke and teeth are set to be less than or equal to the sheet thickness from one sheet surface to the other. The stator according to feature 1.

4. The protruding shape from the sheet surface at the back yoke recess and the teeth recess is set to be V-shaped or flat-bottomed in a side view. The stator according to feature 1.

5. The back yoke recessed holes and the teeth recessed holes are circular or rectangular in plan view. The stator according to feature 1.

6. An electric motor using a stator according to any one of claims 1 to 5, A rotor is positioned on the inner circumference of the stator, A slot is formed between adjacent teeth portions. The winding is wound around the teeth portion. An electric motor characterized by the following features.

7. A compressor using an electric motor as described in claim 6, The electric motor and the compression mechanism are arranged inside a sealed container. The stator is fixed to the sealed container. A compressor characterized by the following features.

8. A device using the compressor described in claim 7, The compressor, condenser, pressure reducing device, and evaporator are connected in a ring shape by piping. A device characterized by the following features.

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