Stator, electric motor, and rotary compressor

Abstract

The invention provides a stator, a motor and a rotary compressor. The stator core is configured in such a manner that a distributed wound coil is disposed on a stator core formed of a split core from the outside of the stator core, thereby improving the efficiency based on the reduction of the coil circumference, reducing noise, reducing cost, and improving the assemblability. The coil (12) is mounted from the outside of the stator core (11) in a shape in which an upper coil end portion (28) is continuous with the upper end of the in-slot coil portion (29), a lower coil end portion (30) is continuous with the lower end of the in-slot coil portion (29), and the coil (12) is mounted from the outside of the stator core (11).

Description

Technical Field

[0001] A rotary compressor is provided as a compressor for an air conditioner or the like. The rotary compressor has a motor and a rotary compression mechanism body disposed inside a sealed container. Background Art

[0002] The motor has a stator disposed inside a housing and a rotor located inside the stator. When the stator generates a rotating magnetic field, the rotor rotates. It is arranged such that as the rotor rotates, an eccentric element (an eccentric portion engaged with a crankshaft, a roller, etc.) of the rotary compression mechanism body rotates. Thereby, the refrigerant introduced into the cylinder of the rotary compression mechanism body is compressed.

[0003] However, not limited to rotary compressors, there are also devices having a stator core, a coil formed of windings mounted on the stator core, and insulators disposed on the upper and lower surfaces of the stator core for use in a motor.

[0004] In the stator, as shown in Patent Document 1, there is a structure in which the stator core is a ring-shaped core type stator core integrally formed into a ring shape, and there is also a structure in which the stator core is divided into small areas, a divided core type stator core.

[0005] Moreover, regarding the method of mounting the coil on the stator core, for the ring-shaped core type stator core, for example, as shown in Patent Document 2, it is formed by inserting from the inside of the stator core into a portion of a slot formed between the teeth of the stator core.

[0006] (Distributed winding)

[0007] The method of mounting the coil shown in Patent Document 2 is a method called so-called distributed winding, and the distributed winding coil is arranged circumferentially across (distributed) a plurality of slots of the stator core.

[0008] The coil has an upper coil end portion on the upper surface side of the stator core, an in-slot coil portion in the slot, and a lower coil end portion on the lower surface side of the stator core.

[0009] Moreover, it is set to the following shape: the upper coil end portion is continuous with one end portion side of the in-slot coil portion, and the lower coil end portion is continuous with the other end portion side of the in-slot coil portion, so that adjacent in-slot coil portions are continuously arranged alternately in the length direction of the winding on the upper coil end portion and the lower coil end portion.

[0010] (Concentrated winding)

[0011] In addition, the method of mounting the coil shown in Patent Document 1 is a method called so-called concentrated winding, and it is arranged such that the coils are concentratedly wound and arranged concentratedly on each tooth.

[0012] Problems to be Solved by the Invention

[0013] In the configuration of the coil in which the winding is mounted in a distributed winding manner on the inner side of the stator core formed in an annular shape as described above, in order to facilitate the manufacture of the stator, the coil circumference is long, and the coil ends on the upper surface side and the lower surface side of the stator core become large. Therefore, there is a problem of large copper loss (low efficiency).

[0014] In addition, in the configuration of the coil installed by concentrated winding, there is a problem that the torque pulsation during operation increases, and vibration and noise are likely to occur.

[0015] Prior Art Documents

[0016] Patent Documents

[0017] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-072428

[0018] Patent Document 2: Japanese Patent Application Laid-Open No. 2006-345601 Summary of the Invention

[0019] Then, in view of the existing situation, an object is to provide a stator, a motor, and a rotary compressor, in which the stator is configured to dispose a distributed winding coil on the stator core formed by a segmented core type from the outside of the stator core, with small copper loss and capable of reducing noise.

[0020] Technical Solution for Solving the Problem

[0021] The present invention has been completed in consideration of the above problems, and provides a stator that solves the above problems. The stator is composed of a cylindrical stator core, an annular disk-shaped insulator disposed on the end face of the stator core, and a coil disposed circumferentially across a plurality of slots of the stator core. The stator is characterized in that,

[0022] The stator core is composed of a plurality of tooth pieces arranged radially and a plurality of yoke pieces that connect the front ends of these plurality of tooth pieces into a ring shape and form the slots on the inside.

[0023] In addition, the present invention is characterized in that a concave portion is formed on the plurality of tooth pieces, a convex portion is formed on the insulator, and a structure in which the concave portion and the convex portion are engaged is provided.

[0024] In addition, the present invention is characterized in that a tapered portion with a cross-sectional shape tapering toward the outside of the stator is provided on the side surface of the tooth piece.

[0025] In addition, the present invention provides a motor, characterized in that it has the stator.

[0026] In addition, the present invention provides a rotary compressor, characterized in that a motor having the stator and a rotary compression mechanism for driving the motor to generate high-pressure gas are provided inside a sealed container.

[0027] In addition, the present invention provides a method for manufacturing a stator, for manufacturing the stator, characterized by including:

[0028] An insulator installation step of disposing the insulator at a position that becomes the lower end face of the stator, respectively disposing the plurality of tooth pieces at the convex portions of the insulator, integrating them by concave-convex fitting, disposing another insulator from a position that becomes the upper end face of the stator, and integrating each convex portion and each concave portion of the plurality of tooth pieces by concave-convex fitting;

[0029] A coil forming step of winding the winding into a shape corresponding to the slot to form the coil;

[0030] A coil installation step of installing the formed coil on the stator integrated in the insulator installation step; and

[0031] A welding step of respectively disposing the plurality of yoke pieces so as to cover the slots in a state where the coils are disposed in the slots, and welding the plurality of tooth pieces and the plurality of yoke pieces.

[0032] Advantages of the Invention

[0033] According to the present invention, a cylindrical stator core is composed of a plurality of tooth pieces arranged radially and a plurality of yoke pieces that connect the front end portions of these plurality of tooth pieces into a ring shape and form the slots inside.

[0034] Moreover, an annular disk-shaped insulator is disposed on the end face of the stator core, and coils are installed in the slots of the stator core.

[0035] In this way, the stator core is configured as a split core type. And since the plurality of tooth pieces are held by the insulator and slots for installing coils are formed between the stator pieces, the coils can be simply installed from the outside of the stator core.

[0036] In addition, the coils only need to be set in a shape consistent with the slots formed between the stator pieces, so pre-formed coils can be made.

[0037] Thereby, compared with the existing structure in which coils wound around a bobbin are inserted inside the stator core and installed in a distributed winding manner, the portion of the coil ends can be reduced, so the coil perimeter can be shortened.

[0038] Furthermore, the slot inner coil portion of the coil formed in the portion of the slot can be installed in a filling manner. Therefore, the winding occupancy rate can be increased, copper loss can be reduced, and efficiency can be improved.

[0039] Moreover, since the coil is wound in a distributed manner, compared with the case where the winding is concentratedly wound around each tooth of the stator core as in the above-mentioned conventional method, the torque ripple during operation can be greatly reduced, and the occurrence of vibration and noise can be suppressed.

[0040] In addition, according to the present invention, since a structure is used in which recesses are formed on the plurality of tooth pieces, protrusions are formed on the insulator, and these recesses and protrusions are engaged, reliable engagement with the tooth pieces can be achieved through a simple structure, and there will be no left-right deviation of the tooth pieces during the installation operation. Moreover, the bonding strength with the tooth pieces is reliable, and dimensional accuracy can be reliably ensured even when external forces in the up-down, left-right directions are applied.

[0041] In addition, according to the present invention, since a tapered portion with a cross-sectional shape tapering toward the outside of the stator is provided on the side surface of the tooth piece, the coil circumference can be shortened, the amount of copper can be reduced, and the cost can be lowered. Furthermore, the coil is easily inserted, damage on the coil side is suppressed, and the quality is good.

[0042] In addition, according to the present invention, since the motor has the stator, the occurrence of noise can be suppressed, and the manufacturing cost of the motor can be reduced.

[0043] In addition, according to the present invention, since the rotary compressor has a structure in which the motor having the stator and a rotary compression mechanism body that generates high-pressure gas driven by the motor are installed inside a sealed container, the occurrence of noise can be suppressed, and the manufacturing cost of the motor can be reduced. Therefore, the manufacturing cost of the rotary compressor itself can also be reduced.

[0044] In addition, according to the present invention, a coil preformed in a distributed winding manner can be inserted into the stator core with high precision through a simple structure, and a plurality of tooth pieces and a plurality of yoke pieces can be reliably and highly precisely engaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is an explanatory diagram showing a rotary compressor according to an embodiment.

[0046] Figure 2 It is an explanatory diagram showing a stator according to an embodiment in a three-dimensional state.

[0047] Figure 3 It is an explanatory diagram showing a state in which a yoke piece is disposed on the side of a tooth piece of a stator core.

[0048] Figure 4 An explanatory drawing showing the tooth piece in a three-dimensional state.

[0049] Figure 5 An explanatory drawing showing the yoke piece in a three-dimensional state.

[0050] Figure 6 An explanatory drawing showing the insulator in a three-dimensional state.

[0051] Figure 7 An explanatory drawing showing a part of the circular ring portion in the insulator.

[0052] Figure 8 An explanatory drawing showing the difference in the shortest coil circumference between the case with a tapered portion and the case without a tapered portion of the tooth piece.

[0053] Figure 9 An explanatory drawing showing an example of the formed coil.

[0054] Figure 10 An explanatory drawing showing the stator of the embodiment in a disassembled state.

[0055] Figure 11 An explanatory drawing schematically showing the manufacturing process of the stator.

[0056] Figure 12 An explanatory drawing showing the pole-slot structure with a coil pitch of 3 and 1 or 2 layers and a coil pitch of 2 and 2 layers in the cases of 4 poles and 12 slots and 6 poles and 18 slots.

[0057] Figure 13 An explanatory drawing showing the formed coil when the coil pitch is 3 and the number of layers is 2.

[0058] Figure 14 An explanatory drawing schematically showing the manufacturing process of the stator 8 with a pole-slot structure of 4 poles and 12 slots and a coil pitch of 3 / number of layers 2.

[0059] Figure 15 An explanatory drawing showing an example of the coil end insulating paper mounted on the formed coil when the coil pitch is 3 and the number of layers is 2.

[0060] Explanation of reference numerals

[0061] 1... Rotary compressor

[0062] 2... Motor

[0063] 8... Stator

[0064] 11... Stator core

[0065] 12... Coil

[0066] 13... Insulator

[0067] 14... Tooth piece

[0068] 15... Yoke piece

[0069] 16... Main body part of the tooth piece

[0070] 17... Opposite part of the tooth piece

[0071] 18... Concave part

[0072] 19... Tapered part

[0073] 20... Step part

[0074] 21... Groove

[0075] 22... End part

[0076] 23... Tooth piece holding part

[0077] 24... Ring part

[0078] 25... Engaging projection

[0079] 27... Projection

[0080] 28, 28a, 28b... Upper side coil end part

[0081] 29, 29a, 29b, 29c, 29d... Coil part in the groove

[0082] 30, 30, 30b... Lower side coil end part

[0083] 31... Insulating paper

[0084] 32... Insulating paper

[0085] 33... Tooth piece ring body

[0086] A... Insulator installation process

[0087] B... Coil forming process

[0088] C... Groove insulating paper installation process

[0089] D... Coil assembly process

[0090] E... Yoke piece assembly process

[0091] F... Coil end insulating paper installation process

[0092] G... Welding process. Specific implementation manners

[0093] Next, the present invention will be described in detail based on the embodiments. In the figure, 1 is a rotary compressor. The rotary compressor 1 includes an electric motor 2 and a rotary compression mechanism body 3 driven by the electric motor 2. Moreover, the electric motor 2 and the rotary compression mechanism body 3 are housed in a sealed container 7. The sealed container 7 includes a cylindrical container main body 4, an end cover 5 attached to one opening portion of the container main body 4, and a bottom 6 attached to the other opening portion of the container main body 4.

[0094] As Figure 1 shown in the cross-section obtained by longitudinally cutting the sealed container 7, the electric motor 2 includes a stator 8 and a rotor 10. The stator 8 forms a rotating magnetic field. The rotor 10 has a rotating shaft 9 continuous with the crank portion of the rotary compression mechanism body 3 and rotates inside the stator 8.

[0095] (Stator)

[0096] Figure 2 The cylindrical stator 8 is shown. The stator 8 has a cylindrical stator core 11, coils 12 attached to the stator core 11, and annular disk-shaped insulators 13 attached to the upper and lower portions of the stator core 11.

[0097] (Stator core)

[0098] In the present embodiment, the stator core 11 is a split core. Moreover, the stator core 11 is composed of a plurality of (12 pieces) tooth pieces 14 and a plurality of (12 pieces) yoke pieces 15. The tooth pieces 14 are arranged in a cylindrical shape, and the yoke pieces 15 are arranged and attached between adjacent tooth pieces 14. The tooth pieces 14 and the yoke pieces 15 are connected by welding.

[0099] (Tooth piece)

[0100] Figure 3 One tooth piece 14 of the stator core 11 in the form of a split core and one yoke piece 15 arranged on one side of the tooth piece 14 are shown. In addition, Figure 4 One tooth piece 14 is shown in a three-dimensional state.

[0101] As Figure 3 and Figure 4 shown, each tooth piece 14 has a main body portion 16 with a substantially rectangular cross-section and an opposing portion 17 formed by connecting to one end portion of the main body portion 16 and being a part of the rotor-facing portion of the stator core 11. The cross-section of the opposing portion 17 is formed in a substantially arc shape. The opposing portion 17 is integrally formed on the inner diameter side of the stator 8 of the main body portion 16 when forming the stator core 11.

[0102] A recess 18 is provided in the main body portion 16 for receiving a later-described engaging unit formed on the insulator 13 side. As described above, insulators 13 are provided on the upper surface side and the lower surface side of the stator core 11, and the tooth plates 14 are engaged with both the insulator 13 disposed on the upper surface side and the insulator 13 disposed on the lower surface side. In order to hold the tooth plates 14 in an annular configuration, recesses 18 are provided on both the upper surface side and the lower surface side of the main body portion 16.

[0103] In addition, the cross-sectional shape of the portion of the main body portion 16 of the tooth plate 14 that is on the outer side of the stator 8 is formed to be tapered, and tapered portions 19 are disposed on both surfaces. Moreover, a stepped portion 20 for receiving the side surfaces (circumferential direction of the stator) of the yoke plates 15, specifically, the later-described portions on the rotor 10 side, is provided at the intermediate position of the main body portion 16.

[0104] Figure 5 The yoke plate 15 is shown in a three-dimensional state. As described above, the tooth plates 14 are respectively held by the insulators 13 and are arranged in an annular shape with a minute gap therebetween. Moreover, a groove 21 that opens toward the outer side of the stator core 11 is formed between adjacent tooth plates 14.

[0105] Moreover, the yoke plate 15 is arranged so as to straddle between the tooth plates 14, the side surfaces of the yoke plate 15 are brought into contact with the tapered portions 19 of the tooth plates 14, and the end portions 22 of the respective side surfaces of the yoke plate 15 that are on the rotor 10 side are locked and arranged at the stepped portions 20 of the tooth plates 14.

[0106] In addition, at the final stage of manufacturing the stator 8, the tooth plates 14 and the yoke plates 15 are connected by welding. In Figure 11 the position of the welding portion is indicated by the symbol w.

[0107] (Insulator)

[0108] Figure 6 The insulator 13 is shown. As shown in the figure, the insulator 13 has an annular circular ring portion 24 and a tooth plate holding portion 23 that is formed to extend radially outward from the circular ring portion 24 and holds the opposing portion 17.

[0109] Figure 7 A part of the circular ring portion 24 and the tooth plate holding portion 23 are shown. As Figure 7 shown, engaging protrusions 25 are formed on the surface portion 26 of the tooth plate holding portion 23 that faces the tooth plate 14. The engaging protrusions 25 are fitted into the recesses 18 of the tooth plate 14, and the upper and lower portions of the tooth plate 14 are integrated with the tooth plate holding portions 23 of the upper and lower insulators 13 that overlap the tooth plate 14, and the tooth plate 14 is held by the upper and lower insulators 13 respectively.

[0110] In addition, a convex portion 27 is provided on the annular portion 24 of the insulator 13. The convex portion 27 is formed to protrude from the surface portion 26 facing the tooth piece 14, and the end portions of the facing portion 17 of the adjacent tooth piece 14 abut thereon.

[0111] The convex portions 27 are formed at intervals in the circumferential direction of the annular portion 24, and abut on the end portions of the facing portion 17 of the tooth piece 14 in a sandwiching manner. The upper and lower portions of the tooth piece 14 are held by the engaging protrusion 25 and the convex portions 27 paired in the circumferential direction.

[0112] Furthermore, the end portions of the facing portion 17 sandwich the convex portion 27, so that the tooth piece 14 is held by the insulator 13, ensuring reliable bonding strength between the tooth piece 14 and the insulator 13. Even when external forces are applied in the up-down, left-right directions, dimensional accuracy can be reliably ensured.

[0113] A tapered portion 19 is provided on the main body portion 16 of the tooth piece 14, and the tooth piece holding portion 23 of the insulator 13 is also formed in a tapered shape that coincides with the position of the tapered portion 19 of the tooth piece 14.

[0114] Figure 8 This is a diagram showing that the coil circumference becomes shorter in this embodiment. Moreover, in Figure 8 , the shortest coil circumference in the stator circumferential direction without the tapered portion 19 is indicated by a dashed line, and the shortest coil circumference in the stator circumferential direction with the tapered portion 19 is indicated by a solid line.

[0115] When the coil 12 is installed from the outside of the stator, since the tapered portion 19 is provided and the tooth piece holding portion 23 of the insulator 13 is also formed in a tapered shape, the coil circumference of the coil 12 can be shortened.

[0116] (Coil)

[0117] In this embodiment, the coil 12 is installed from the outside of the stator core 11, which is a segmented iron core. Moreover, the installed coil 12 is preformed. Figure 9 This shows the preformed coil 12.

[0118] As shown in the figure, the coil 12 is a formed coil that is preformed by winding the winding into a shape that coincides with the coil arrangement position formed on the stator core 11 when installed from the outside of the stator.

[0119] Moreover, in the stator 8 of this embodiment, in order to install the coils at three coil arrangement positions offset in the stator circumferential direction of the stator core 11, the winding is wound into a shape that coincides with the arrangement position to preform the coil 12. Figure 9 One coil 12 is shown in

[0120] As Figure 9As shown, the coil 12 has an upper coil end 28 (28a, 28b) which is located on the upper surface side of the stator core 11, an in-slot coil portion 29 (29a, 29b, 29c, 29d) located in the slot 21 of the stator core 11, and a lower coil end 30 (30a, 30b) located on the lower surface side of the stator core 11.

[0121] The shape of the coil 12 is as shown in the figure, with a first slot coil portion 29a and a first upper coil end portion 28a extending in one direction of the stator circumferential direction in a direction in which the windings are connected, and the first upper coil end portion 28a is continuous with the upper end of the first slot coil portion 29a. The first upper coil end portion 28a is continuous with the upper end of the second slot coil portion 29b.

[0122] The first lower coil end portion 30a is continuous with the lower end of the second in-slot coil portion 29b, and the first lower coil end portion 30a extends in the one direction in the stator circumferential direction and is continuous with the lower end of the third in-slot coil portion 29c.

[0123] Furthermore, the second upper coil end portion 28b is continuous with the upper end of the third in-slot coil portion 29c, and the second upper coil end portion 28b extends in the one direction of the stator circumferential direction and is continuous with the upper end of the fourth in-slot coil portion 29d.

[0124] Furthermore, the second lower coil end portion 30b is continuous with the lower end of the fourth in-slot coil portion 29c, and the second lower coil end portion 30b extends in the one direction of the stator circumferential direction and is continuous with the lower end of the first in-slot coil portion 29a.

[0125] In the coil 12 of the above structure, the first upper coil end 28a is continuous with the upper ends of the first and second slot coil parts 29a and 29b, and the second upper coil end 28b is continuous with the upper ends of the third and fourth slot coil parts 29c and 29d. Furthermore, the first lower coil end 30a is continuous with the lower ends of the second and third slot coil parts 29b and 29c, and the second lower coil end 30b is continuous with the lower ends of the first and fourth slot coil parts 29a and 29d, and the winding is wavy in the height direction of the stator core 11 and is formed into a shape that covers the circumference of the stator.

[0126] Figure 10 The stator 8 of the present embodiment is shown in an exploded state, where the three coils 12 preliminarily formed in the above-mentioned shape are arranged at shifted positions in the stator circumferential direction, so that the assembled components can be easily seen.

[0127] Figure 10 The symbol 31 in FIG. 1 represents a circular insulating paper provided at the end of the coil. Figure 10Among them, the insulating papers 31 shown on the upper side and the lower side in the vertical direction of the stator 8 are the insulating papers for the portions that become the upper coil ends 28 and the portions that become the lower coil ends 30 and are inserted into the stator 8.

[0128] The insulating paper 31 is used to form an insulating structure between the out-of-phase coils and, as described later, is sandwiched between the upper coil end portions 28.

[0129] In addition, in the slot coil portion 29 of the coil 12, an insulating paper 32 is installed before being mounted on the stator core 11. The insulating paper 32 is used to form an insulating structure between the stator core 11 (the tooth pieces 14 and the yoke piece 15) and the coil 12.

[0130] (Assembly of the stator)

[0131] Figure 11 The manufacturing process of assembling the stator 8 of the present embodiment is shown in a flow chart.

[0132] (Insulator installation process, coil forming process, slot insulating paper installation process)

[0133] As Figure 11 shown, first, an insulator installation process A, a coil forming process B, and a slot insulating paper installation process C are performed.

[0134] In the insulator installation process A, on one hand, for example, the tooth pieces 14 are respectively arranged at the corresponding positions of the insulator 13 where the arrangement process has been performed on the lower side in the vertical direction of the stator 8, and are integrated through the above-mentioned concave-convex fitting, and another insulator 13 is arranged from the upper side in the vertical direction of the stator 8 and is integrated in the same way.

[0135] The coil forming process B is a process performed separately from the insulator installation process A. The winding is wound into a shape corresponding to the coil arrangement position in the stator core 11 to form a coil 12 with a shape corresponding to the coil arrangement position. Moreover, in the slot insulating paper installation process C, the insulating paper 32 is installed and fixed on the slot coil portion 29 of the formed coil 12.

[0136] (Coil assembly process)

[0137] Prepare an integrated object formed by integrally combining the upper and lower insulators 13 on a plurality of (12) tooth pieces 14 in the insulator installation process A, and the formed coil 12 produced through the coil forming process B and the slot insulating paper installation process C, and enter the coil assembly process D.

[0138] In the coil assembly process D, on the outer periphery of the stator core 11 without the yoke piece 15 installed, that is, the cylindrical tooth piece arrangement body 33 held by the upper and lower insulators 13 and composed of a plurality of tooth pieces 14, three coils 12 are installed from the side becoming the outside of the stator.

[0139] (Yoke Plate Assembly Process)

[0140] On the tooth plate ring body 33, three coils 12 are installed in the slots 21 that are in a state of being opened toward the outside of the stator in a manner corresponding to the slot inner coil portions 29 with insulating paper 32 installed therein. Then, it enters the yoke plate assembly process E.

[0141] In the yoke plate assembly process E, the yoke plates 15 are arranged from the outside of the stator in a manner that spans between the tooth plates 14 so as to cover the slots 21 in which the slot inner coil portions 29 are arranged.

[0142] (Coil End Insulating Paper Installation Process)

[0143] Next, it enters the coil end insulating paper installation process F. In the coil end insulating paper installation process F, in order to prevent the coils of different phases from directly contacting each other at the coil ends on the upper and lower sides of the stator core 11, the annular insulating paper 31 is installed in a sandwiching manner.

[0144] (Welding Process)

[0145] Next, it enters the welding process G of welding the tooth plates 14 and the yoke plates 15 from the outside of the stator. By welding the tooth plates 14 and the yoke plates 15 in the welding process G, the manufacturing of the stator 8 is completed.

[0146] The stator 8 of this embodiment has a structure of 4 poles and 12 slots. In order to obtain good efficiency, the coil pitch 3 with a high winding coefficient is selected, and the number of layers is selected as 1 layer with a small number of coils (number of parts).

[0147] However, the present invention is not limited to the above embodiment. For example, it also includes coil pitch 3 / number of layers 2, coil pitch 2 / number of layers 2, etc.

[0148] In addition, in addition to the above embodiment, the pole-slot structure may also include 4 poles and 24 slots, 6 poles and 18 slots, 6 poles and 36 slots, 8 poles and 24 slots, 8 poles and 48 slots, etc.

[0149] Figure 12 Schematically shows the pole-slot structures with coil pitch 3 and number of layers 1, 2, and coil pitch 2 and number of layers 2 in the cases of 4 poles and 12 slots and 6 poles and 18 slots including the above embodiment (4 poles and 12 slots, coil pitch 3 / number of layers 1).

[0150] In addition, Figure 14 Shows the manufacturing process of the stator 8 with the pole-slot structure being 4 poles and 12 slots and the coil pitch being 3 / number of layers 2.

[0151] (Insulator Installation Process)

[0152] Similar to the previously shown embodiment, in the insulator installation process A, a toothed ring body 33 of the stator core 11 without the yoke piece 15 installed is formed.

[0153] (Coil forming process)

[0154] In the coil forming process B, a coil 12 formed separately from the formation of the toothed ring body 33 is obtained, the winding is wound into a shape corresponding to the coil arrangement position in the stator core 11, and the coil 12 with a shape corresponding to the above coil arrangement position is formed.

[0155] (Slot insulating paper installation process)

[0156] In the slot insulating paper installation process C, the insulating paper 32 is installed and fixed in the slot inner coil part 29 of the formed coil 12.

[0157] (Coil end insulating paper installation process)

[0158] The coil end insulating paper process F is carried out. In this embodiment, a horizontal cylindrical insulating paper 31 is installed on the upper coil end 29 and the lower coil end 30 of the formed coil 12.

[0159] (Coil assembly process)

[0160] In the insulator installation process A, an integrated object in which the upper and lower insulators 13 are integrally combined on multiple (12) toothed pieces 14, and the formed coil 12 produced through the coil forming process B, the slot insulating paper installation process C, and the coil end insulating paper installation process F are prepared, and enter the coil assembly process D.

[0161] In the coil assembly process D, without installing the yoke piece 15, 12 coils 12 are installed from the side becoming the outside of the stator on the outer periphery of the cylindrical toothed ring body 33 held by the upper and lower insulators 13 and composed of multiple toothed pieces 14.

[0162] (Yoke piece assembly process)

[0163] In the toothed ring body 33, 12 coils 12 are installed in the slots 21 in a state of being open toward the outside of the stator in a manner corresponding to the slot inner coil part 29 where the insulating paper 32 is installed, and then enter the yoke piece assembly process E.

[0164] In the yoke piece assembly process E, the yoke piece 15 is arranged from the outside of the stator across between the toothed pieces 14 in a manner of covering the slot 21 where the slot inner coil part 29 is arranged.

[0165] (Welding process)

[0166] Next, the welding process G for welding the tooth piece 14 and the yoke piece 15 from the outside of the stator is entered. In the welding process G, the tooth piece 14 and the yoke piece 15 are welded to complete the manufacture of the stator 8. The position of the welded portion is indicated by the symbol w.

[0167] In Figure 13 and Figure 14 The coil 12 used in the stator 8 having 4 poles and 12 slots and a coil pitch of 3 / layer 2 is shown. The coil 12 used in the stator 8 of the pole-slot structure of the present embodiment includes two in-slot coil portions 29, 29, an upper-side coil end portion 28 continuous across the upper ends of the in-slot coil portions 29, and an upper-side coil end portion 28 continuous across the lower ends of the in-slot coil portions 29, and is formed into a shape corresponding to the coil arrangement position in the tooth piece ring body 33.

[0168] In addition, Figure 15 The insulating paper 31 is shown. In the case of the stator 8 having 4 poles and 12 slots and a coil pitch of 3 / layer 2, as described above, it is arranged to be in a cylindrical shape when directly mounted on the upper-side coil end portion 28 and the lower-side coil end portion 30.

Claims

1. A stator, which is composed of a cylindrical stator core, an annular disk-shaped insulator disposed on an end face of the stator core, and coils circumferentially disposed across a plurality of slots of the stator core, and is characterized in that: The stator core is composed of a plurality of radially arranged tooth pieces and a plurality of yoke pieces that connect front end portions of these plurality of tooth pieces into a ring shape and form the slots on the inner side.

2. The stator according to claim 1, wherein: A structure is provided in which recesses are formed on the plurality of tooth pieces, protrusions are formed on the insulator, and the recesses and the protrusions are engaged with each other.

3. The stator according to claim 1 or 2, wherein: A tapered portion with a cross-sectional shape tapering toward the outside of the stator is provided on a side surface of the tooth piece.

4. A motor, characterized in that: It has the stator according to claim 1 or 2.

5. A rotary compressor, characterized in that: A motor having the stator according to claim 1 or 2 and a rotary compression mechanism body that drives the motor and generates high-pressure gas are installed inside a sealed container.

6. A manufacturing method of a stator, for manufacturing the stator according to claim 2, characterized in that, Comprising: An insulator installation process, in which the insulator is disposed at a position that becomes a lower end face of the stator, the plurality of tooth pieces are respectively disposed on the protrusions of the insulator, and are integrated by concave-convex fitting, another insulator is disposed from a position that becomes an upper end face of the stator, and each protrusion and each recess of the plurality of tooth pieces are integrated by concave-convex fitting; A coil forming process, in which a winding is wound into a shape corresponding to the slot to form the coil; A coil installation process, in which the formed coil is installed on the stator integrated in the insulator installation process; And A welding process, in which, in a state where the coil is disposed in the slot, the plurality of yoke pieces are respectively disposed so as to cover the slot, and the plurality of tooth pieces and the plurality of yoke pieces are welded.

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