Stator, electric motor, and rotary compressor

Abstract

To arrange a distributed winding coil on the outer side of a split core type stator core, thereby improving efficiency by reducing the coil circumference, reducing noise, reducing costs, and improving assembly ease.SOLUTION: A coil 12 includes an upper coil end portion 28 continuous with the upper end of an in-slot coil portion 29 and a lower coil end portion 30 at the lower end of the in-slot coil portion 29, and is pre-formed into a shape that matches the coil arrangement position, and is attached from the outer side of a stator core 11.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] Rotary compressors are provided as compressors for air conditioners and the like. A rotary compressor has an electric motor and a rotary compression mechanism disposed inside a sealed container.

[0002] The electric motor has a stator disposed in a case and a rotor positioned inside the stator. When a rotating magnetic field is generated in the stator, the rotor rotates. An eccentric element (such as an eccentric portion or a roller that engages with a crankshaft) of the rotary compression mechanism is provided to rotate as the rotor rotates. Thereby, the refrigerant introduced into the cylinder of the rotary compression mechanism is compressed.

[0003] By the way, although not limited to rotary compressors, some stators used in electric motors have a stator core, a coil composed of windings attached to the stator core, and insulators disposed on the upper and lower surfaces of the stator core.

[0004] As shown in Patent Document 1, for the stator, there are those in which the stator core is an annular core type integrally formed in an annular shape, and those in which the stator core is a divided core type divided into small sections.

[0005] Regarding the method of attaching the coil to the stator core, for an annular core type stator core, as shown in Patent Document 2 for example, it is inserted into and configured in a slot formed between the teeth of the stator core from the inside of the stator core.

[0006] (Distributed winding) The method of attaching the coil shown in Patent Document 2 is what is called so-called distributed winding. The distributed coil straddles (is distributed over) a plurality of slots of the stator core and is arranged in the circumferential direction.

[0007] The coil includes an upper coil end portion located on the upper surface side of the stator core, a slot inner coil portion located in the slot, and a lower coil end portion located on the lower surface side of the stator core.

[0008] And, the upper coil end portion is continuous with one end side of the slot inner coil portion, and the lower coil end portion is continuous with the other end side of the slot inner coil portion, and the adjacent slot inner coil portions are arranged in a shape where they are continuously connected along the length direction of the winding wire alternately with the upper coil end portion and the lower coil end portion.

[0009] (Concentrated winding) Also, the method of attaching the coil shown in Patent Document 1 is what is called so-called concentrated winding, and it is an arrangement in which the coil is concentratedly wound around each one tooth.

Prior art documents

Patent documents

[0010]

Patent Document 1

Patent Document 2

Summary of the invention

Problems to be solved by the invention

[0011] In the arrangement of the coil in which the winding wire is distributed and wound inside the stator core formed in an annular shape as described above, due to the convenience of manufacturing the stator, the coil circumference is long, and the coil ends located on the upper surface side and the lower surface side of the stator core become large, so there is a problem that the copper loss is large (the efficiency is low).

[0012] Also, in the arrangement of the coil attached by concentrated winding, there is a problem that the torque pulsation during operation increases and vibration and noise are likely to occur.

[0013] Therefore, in view of the conventional situation, an object of the present invention is to provide a stator, a motor, and a rotary compressor in which a distributed winding coil is arranged on the outer side of a stator core having a split core type, with low copper loss and reduced noise.

Means for Solving the Problems

[0014] The present invention has been made in consideration of the above problems, and in a stator comprising a cylindrical stator core, an annular plate-shaped insulator arranged on the end face of the stator core, and a coil arranged circumferentially across a plurality of slots of the stator core, the stator core is characterized in that it is composed of a plurality of radially arranged tooth pieces and a plurality of yoke pieces that annularly connect the tip portions of these plurality of tooth pieces and form the slots inside, thereby solving the above problems.

[0015] Further, the present invention is characterized in that recesses are formed in the plurality of tooth pieces, protrusions are formed in the insulator, and these recesses and protrusions are engaged with each other.

[0016] Further, the present invention is characterized in that a tapered portion with a tapered cross-sectional shape toward the outside of the stator is provided on the side surface of the tooth piece.

[0017] Further, the present invention is a motor characterized by having the stator.

[0018] Further, the present invention is 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 mounted inside a sealed container.

[0019] Further, the present invention is a method for manufacturing the stator, An insulator is disposed at a position that is the lower end face of the stator, and each of the plurality of tooth pieces is disposed on each of the convex portions of the insulator and integrated by concave-convex fitting. Another insulator is disposed from a position that is the upper end face of the stator, and each of the convex portions and each of the concave portions of the plurality of tooth pieces are integrated by concave-convex fitting. This is an insulator mounting step. A coil forming step of winding a wire in a shape corresponding to the slot to form the coil. A coil mounting step of mounting the formed coil on the stator integrated in the insulator mounting step. [[ID=]6]A welding step of disposing each of the plurality of yoke pieces so as to cover the slit in a state where the coil is disposed in the slot, and welding the plurality of tooth pieces and the plurality of yoke pieces. A method for manufacturing a stator, characterized by including this.

Effect of the Invention

[0020] According to the present invention, the cylindrical stator core is composed of a plurality of tooth pieces arranged radially and a plurality of yoke pieces that connect the tip portions of these plurality of tooth pieces in an annular shape and form the slot inside.

[0021] And, an annular plate-shaped insulator is disposed on the end face of this stator core, and a coil is mounted in the slot of the stator core.

[0022] 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 a slot for mounting the coil is formed between the stator pieces, the coil can be easily mounted from the outside of the stator core.

[0023] Further, since the coil may have a shape that matches the slot formed between the stator pieces, it can be a pre-formed molded coil.

[0024] As a result, compared with the conventional method of inserting a coil wound around a winding frame inside the stator core and arranging it in a distributed winding manner, the portion of the coil end can be made smaller, so the coil circumference can be shortened.

[0025] Furthermore, the in-slot coil portion of the coil formed in the slot portion can be packed and attached. Therefore, the occupancy rate of the winding wire can be increased, reducing copper loss and improving efficiency.

[0026] And since the coil is in the form of a distributed winding, compared with the case of using a concentrated winding in which winding wires are concentratedly wound on each of the teeth portions of the conventional stator core described above, torque pulsation during operation can be significantly reduced, and the generation of vibration and noise can be suppressed.

[0027] Also, according to the present invention, since the plurality of tooth pieces are formed with recesses and the insulator is formed with protrusions, and a configuration in which these recesses and protrusions are engaged is used, reliable engagement with the tooth pieces is achieved with a simple structure, and lateral displacement of the tooth pieces does not occur during the mounting operation. And the bonding strength with the tooth pieces is ensured, and dimensional accuracy can be reliably ensured even when external forces in the vertical, horizontal, and lateral directions are applied.

[0028] Also, according to the present invention, since a tapered portion whose cross-sectional shape tapers 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 can be easily inserted, suppressing damage on the coil side and improving the quality.

[0029] Also, according to the present invention, since the electric motor has the stator, the generation of noise can be suppressed and the manufacturing cost of the electric motor can be reduced.

[0030] Further, according to the present invention, since the rotary compressor has the electric motor having the stator and the rotary compression mechanism driven by the electric motor to generate high-pressure gas mounted inside the sealed container, generation of noise can be suppressed, the manufacturing cost of the electric motor can be reduced, and thus the manufacturing cost of the rotary compressor itself can also be lowered.

[0031] Also, according to the present invention, with a simple structure, a coil preformed by distributed winding can be accurately inserted into the stator core, and a plurality of tooth pieces and a plurality of yoke pieces can be reliably and accurately engaged.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Mode for Carrying Out the Invention

[0033] Next, the present invention will be described in detail based on the embodiments. In the figure, 1 is a rotary compressor, and the rotary compressor 1 includes an electric motor 2 and a rotary compressor mechanism 3 driven by the electric motor 2. The electric motor 2 and the rotary compressor mechanism 3 are housed in a sealed container 7 including a cylindrical container body 4, an end cap 5 attached to one opening of the container body 4, and a bottom 6 attached to the other opening of the container body 4.

[0034] As shown in a longitudinally cut cross-section of the sealed container 7 in Fig. 1, the electric motor 2 includes a stator 8 that forms a rotating magnetic field and a rotor 10 that has a rotating shaft 9 continuous with the crank portion of the rotary compressor mechanism 3 and rotates inside the stator 8.

[0035] (Stator) Fig. 2 shows the cylindrical stator 8. The stator 8 includes a cylindrical stator core 11, a coil 12 attached to the stator core 11, and annular plate-shaped insulators 13 attached above and below the stator core 11.

[0036] (Stator Core) In this embodiment, the stator core 11 is a split core. The stator core 11 is composed of a plurality (12 pieces) of tooth pieces 14 and a plurality (12 pieces) of yoke pieces 15. The tooth pieces 14 are arranged in a cylindrical shape, and the yoke pieces 15 are arranged so as to be attached between adjacent tooth pieces 14, and the tooth pieces 14 and the yoke pieces 15 are connected by welding.

[0037] (Tooth piece) FIG. 3 shows 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 this tooth piece 14. FIG. 4 shows one tooth piece 14 in a perspective state.

[0038] As shown in FIGS. 3 and 4, each of the tooth pieces 14 has a main body portion 16 having a substantially rectangular cross section, and a facing portion 17 that is formed continuously with one end portion of the main body portion 16 and forms a part of the rotor-facing portion of the stator core 11. The facing portion 17 is formed with a substantially arc-shaped cross section. The facing portion 17 is integrally formed on the inner diameter side of the stator 8 of the main body portion 16 when the stator core 11 is formed.

[0039] The main body portion 16 is provided with a recess 18 into which an engaging means (described later) formed on the insulator 13 side is fitted. As described above, the insulator 13 is provided on the upper surface side and the lower surface side of the stator core 11. The tooth pieces 14 are engaged with both the insulator 13 arranged on the upper surface side and the insulator 13 arranged on the lower surface side, and the recesses 18 are provided on both the upper surface side and the lower surface side of the main body portion 16 so that each of the tooth pieces 14 is held in an annular arrangement.

[0040] Further, the portion of the main body portion 16 of the tooth piece 14 on the outer side of the stator 8 has a tapered portion 19 formed with a tapered cross section on both sides, and a stepped portion 20 for receiving a portion (described later) on the rotor 10 side at the middle position of the main body portion 16 on the side surface side (in the stator circumferential direction) of the yoke piece 15.

[0041] FIG. 5 shows the yoke piece 15 in a perspective state. As described above, each of the tooth pieces 14 is held by the insulator 14 and arranged in an annular shape with a slight gap. And between adjacent tooth pieces 14, a slot 21 that opens outwardly of the stator core 11 is formed.

[0042] And the yoke piece 15 is arranged so as to span between the tooth pieces 14, and the side surfaces of the yoke piece 15 are brought into contact with the tapered portions 19 of the tooth pieces 14, and the end portions 22 on the rotor 10 side of each of the side surfaces of the yoke piece 15 are hooked on the stepped portions 20 of the tooth pieces 14 and arranged.

[0043] In addition, at the final stage of manufacturing the stator 8, the tooth piece 14 and the yoke piece 15 are connected by welding. In FIG. 11, the position of the welded portion is indicated by the symbol w.

[0044] (Insulator) FIG. 6 shows the insulator 13. As shown in the figure, the insulator 13 has an annular ring portion 24 and a tooth piece holding portion 23 that extends radially outward from the ring portion 24 and holds the opposing portion 17.

[0045] FIG. 7 shows a part of the ring portion 24 and the tooth piece holding portion 23. As shown in FIG. 7, an engaging protrusion 25 is formed on the surface portion 26 of the tooth piece holding portion 23 that faces the tooth piece 14, and the engaging protrusion 25 fits into the concave portion 18 of the tooth piece 14, and the upper and lower portions of the tooth piece 14 are integrated with the tooth piece holding portions 23 of the upper and lower insulators 13 that overlap the tooth piece 14, and each of the tooth pieces 14 is held by the upper and lower insulators 13.

[0046] Also, on the ring portion 24 of the insulator 13, a convex portion 27 is provided that protrudes from the surface portion 26 facing the tooth piece 14 and with which the end portions of the opposing portions 17 of adjacent tooth pieces 14 abut.

[0047] The convex portions 27 are formed at intervals in the circumferential direction in the annular portion 24, and are in contact with each other so as to be sandwiched at the ends of the opposing portions 17 of the tooth pieces 14, and are held by the engaging protrusions 25 and the convex portions 27 paired in the circumferential direction at the upper and lower portions of the tooth pieces 14 respectively.

[0048] Furthermore, by sandwiching the convex portions 27 at each end of the opposing portion 17, the tooth piece 14 is held by the insulator 13, ensuring the bonding strength between the tooth piece 14 and the insulator 13, and ensuring dimensional accuracy even when external forces are applied from above, below, left, and right.

[0049] The 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 aligns with the position of the tapered portion 19 of the tooth piece 14.

[0050] FIG. 8 is a diagram showing the point that the coil circumference is shortened in the present embodiment. In FIG. 8, the shortest coil circumference in the stator circumferential direction when there is no tapered portion 19 is shown by a dashed line, and the shortest coil circumference in the stator circumferential direction when there is a tapered portion 19 is shown by a solid line.

[0051] When attaching the coil 12 from the outside of the stator, the presence of the tapered portion 19 and the similarly tapered shape of the tooth piece holding portion 23 of the insulator 13 make it possible to shorten the coil circumference of the coil 12.

[0052] (Coil) In the present embodiment, the coil 12 is attached from the outside of the stator core 11 in the form of a split core. The coil 12 to be attached is pre-formed. FIG. 9 shows the pre-formed coil 12.

[0053] As shown in the figure, the coil 12 is a pre-formed coil in which the winding is wound in a shape that matches the coil arrangement position formed on the stator core 11 when the coil 12 is attached to the stator core 11 from the outside of the stator.

[0054] And in the stator 8 of the present embodiment, in order to attach the three coil arrangement positions while shifting them in the circumferential direction of the stator core 11 of the stator, the coil 12 is pre-formed by winding the wire in a shape that matches its arrangement position. One coil 12 is shown in FIG. 9. Of course, the three coils 12 are formed in the same shape.

[0055] As shown in FIG. 9, the coil 12 includes an upper coil end portion 28 (28a, 28b) that is a portion located on the upper surface side of the stator core 11, a slot inner coil portion 29 (29a, 29b, 29c, 29d) that is located in the slot 21 of the stator core 11, and a lower coil end portion 30 (30a, 30b) that is located on the lower surface side of the stator core 11.

[0056] And the shape of the coil 12 is such that, as shown in the drawing, there is a first slot inner coil portion 29a in the direction in which the wire is continuous, and a first upper coil end portion 28a that extends along one side in the circumferential direction of the stator and is continuous with the upper end of the first slot inner coil portion 29a. The first upper coil end portion 28a is continuous with the upper end of the second slot inner coil portion 29b.

[0057] A first lower coil end portion 30a is continuous with the lower end of the second slot inner coil portion 29b, and the first lower coil end portion 30a extends in the one side in the circumferential direction of the stator and is continuous with the lower end of the third slot inner coil portion 29c.

[0058] Furthermore, a second upper coil end portion 28b is continuous with the upper end of the third slot inner coil portion 29c, and the second upper coil end portion 28b extends in the one side in the circumferential direction of the stator and is continuous with the upper end of the fourth slot inner coil portion 29d.

[0059] Furthermore, a second lower coil end portion 30b is continuous with the lower end of the fourth slot inner coil portion 29c, and the second lower coil end portion 30b extends in the one direction in the circumferential direction of the stator and is continuous with the lower end of the first slot inner coil portion 29a.

[0060] In the coil 12 with the above structure, the first upper coil end portion 28a is continuous with the upper ends of the first and second in-slot coil portions 29a and 29b, and the second upper coil end portion 28b is continuous with the upper ends of the third and fourth in-slot coil portions 29c and 29d. Then, the first lower coil end portion 30a is continuous with the lower ends of the second and third in-slot coil portions 29b and 29c, and the second lower coil end portion 30b is continuous with the lower ends of the first and fourth in-slot coil portions 29a and 29d. The winding is formed in a shape that extends in the stator circumferential direction while being wavy in the height direction of the stator core 11.

[0061] FIG. 10 shows the stator 8 of the present embodiment in a disassembled state, and shows the stator 8 in which three coils 12 preformed in the above-described shape are arranged with their positions shifted in the stator circumferential direction, and the combined parts are represented in an easy-to-see manner.

[0062] Reference numeral 31 in FIG. 10 indicates an annular insulating paper provided at the coil end. The insulating papers 31 shown on the upper side and the lower side in the vertical direction of the stator 8 in FIG. 10 are insulating papers incorporated in the portions that become the upper coil end 28 and the lower coil end 30 in the stator 8.

[0063] The insulating paper 31 is for forming an insulation structure between different-phase coils, and is sandwiched between the upper coil end portions 28 as will be described later.

[0064] Also, an insulating paper 32 is attached to the in-slot coil portion 29 of the coil 12 before being attached to the stator core 11. The insulating paper 32 is for forming an insulation structure between the stator core 11 (tooth pieces 14 and yoke pieces 15) and the coil 12.

[0065] (Assembly of the stator) FIG. 11 shows the manufacturing process of assembling the stator 8 according to the present embodiment in a flow chart.

[0066] (Insulator mounting process, coil forming process, slot insulating paper mounting process) As shown in Fig. 11, first, an insulator mounting process A, a coil forming process B, and a slot insulating paper mounting process C are performed.

[0067] In the insulator mounting process A, on the other hand, for example, at corresponding positions of the insulator 13 arranged on the lower side in the vertical direction of the stator 8, the tooth pieces 14 are arranged and integrated by 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 integrated in the same way.

[0068] The coil forming process B is a process performed separately from the insulator mounting process A. The winding is wound into a shape corresponding to the coil arrangement position on the stator core 11 to form a coil 12 having a shape corresponding to the coil arrangement position. Then, in the slot insulating paper mounting process C, the insulating paper 32 is attached and fixed to the in-slot coil portion 29 of the formed coil 12.

[0069] (Coil assembly process) An integrated object in which the upper and lower insulators 13 are integrally combined with a plurality (12) of tooth pieces 14 in the insulator mounting process A, and the formed coil 12 created through the coil forming process B and the slot insulating paper mounting process C are prepared and the process proceeds to the coil assembly process D.

[0070] In the coil assembly process D, three coils 12 are attached to the outer periphery of the stator core 11 with the yoke pieces 15 not mounted, that is, a cylindrical tooth piece array body 33 composed of a plurality of tooth pieces 14 held by the upper and lower insulators 13, from the outer side of the stator.

[0071] (Yoke piece assembly process) After attaching the three coils 12 so that the in-slot coil portion 29 with the insulating paper 32 mounted thereon corresponds to the slot 21 that was open toward the outside of the stator in the tooth piece ring body 33, the process proceeds to the yoke piece assembly process E.

[0072] In the yoke piece assembling step E, the yoke piece 15 is arranged from the outside of the stator so as to cover the slit 21 in which the in-slot coil portion 29 is arranged and to pass between the tooth pieces 14.

[0073] (Coil end insulation paper mounting step) Next, proceed to the coil end insulation paper mounting step F. In the coil end insulation paper mounting step F, in order to prevent the different-phase coils from directly contacting each other on the coil ends above and below the stator core 11, an annular insulation paper 31 is attached so as to be sandwiched.

[0074] (Welding step) Next, proceed to the welding step G of welding the tooth piece 14 and the yoke piece 15 from the outside of the stator. By welding the tooth piece 14 and the yoke piece 15 in the welding step G, the manufacturing of the stator 8 is completed.

[0075] The stator 8 of the present embodiment has a structure of 4 poles and 12 slots. In order to obtain good efficiency, a coil pitch 3 with a high winding coefficient is selected, and the number of layers is 1 layer with a small number of coils (number of parts).

[0076] However, the present invention is not limited to the above-described embodiment. For example, it also includes a coil pitch 3 / number of layers 2, a coil pitch 2 / number of layers 2, etc.

[0077] In addition to the above-described embodiment, the pole-slot configuration can 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.

[0078] FIG. 12 schematically shows the pole-slot configurations with a coil pitch of 3 and the number of layers of 1 and 2, and a coil pitch of 2 and the number of layers of 2 in the cases of 4 poles and 12 slots and 6 poles and 18 slots, including the above-described embodiment (4 poles and 12 slots, coil pitch 3 / number of layers 1).

[0079] Further, FIG. 14 shows the manufacturing process of the stator 8 with a pole slot configuration of 4 poles and 12 slots and a coil pitch of 3 / layer number of 2.

[0080] (Insulator mounting process) Similar to the embodiment shown above, in the insulator mounting process A, a tooth piece ring body 33 is formed as a stator core 11 without the yoke piece 15 mounted.

[0081] (Coil forming process) In the coil forming process B, a formed coil 12 is obtained separately from the formation of the tooth piece ring body 33. The wire 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.

[0082] (Slot insulating paper mounting process) In the slot insulating paper mounting process C, the insulating paper 32 is attached and fixed to the in-slot coil portion 29 of the formed coil 12.

[0083] (Coil end insulating paper mounting process) The coil end insulating paper process F is performed. In this embodiment, a horizontally cylindrical insulating paper 31 is attached to the upper coil end portion 29 and the lower coil end portion 30 of the formed coil 12.

[0084] (Coil assembly process) In the insulator mounting process A, an integrated object in which the upper and lower insulators 13 are integrally combined with a plurality (12) of tooth pieces 14, and the formed coil 12 created through the coil forming process B, the slot insulating paper mounting process C, and the coil end insulating paper mounting process F are prepared, and the process proceeds to the coil assembly process D.

[0085] In the coil assembly process D, with the yoke piece 15 not mounted, twelve coils 12 are attached to the outer periphery of the cylindrical tooth piece ring body 33 composed of a plurality of tooth pieces 14 held by the upper and lower insulators 13 from the side facing the outside of the stator.

[0086] (Yoke piece assembly process) After attaching the 12 coils 12 so that the slot inner coil part 29 with the slot insulating paper 32 attached thereto corresponds to the slot 21 which was open toward the outside of the stator in the tooth piece ring body 33, the process proceeds to the yoke piece assembly process E.

[0087] In the yoke piece assembly process E, the yoke piece 15 is arranged from the outside of the stator so as to cover the slot 21 in which the slot inner coil part 29 is arranged and to span between the tooth pieces 14.

[0088] (Welding process) Next, the process proceeds to the welding process G of welding the tooth piece 14 and the yoke piece 15 from the outside of the stator. By welding the tooth piece 14 and the yoke piece 15 in the welding process G, the manufacture of the stator 8 is completed. The position of the welded part is indicated by the symbol w.

[0089] In FIGS. 13 and 14, the coil 12 used for the stator 8 having 4 poles and 12 slots with a coil pitch of 3 and a number of layers of 2 is shown. The coil 12 used for the stator 8 having the pole-slot configuration of the present embodiment includes two slot inner coil parts 29, 29, an upper coil end part 28 continuous between the upper ends of the slot inner coil parts 29, and a lower coil end part 28 continuous between the lower ends of the slot inner coil parts 29, and is formed in a shape corresponding to the coil arrangement position in the tooth piece ring body 33.

[0090] Further, FIG. 15 shows the insulating paper 31. In the case of the stator 8 having 4 poles and 12 slots with a coil pitch of 3 and a number of layers of 2, as described above, it is provided so as to form a cylindrical shape when directly attached to the upper coil end part 28 and the lower coil end part 30.

Explanation of symbols

[0091] 1…Rotary compressor 2…Electric motor 8…Stator 11…Stator core 12…Coil 13… Insulator 14… Tooth piece 15… Yoke piece 16… Main body part of tooth piece 17… Opposite part of tooth piece 18… Concave part 19… Taper part 20… Step part 21… Slot 22… End part 23… Tooth piece holding part 24… Annular part 25… Engaging protrusion 27… Protrusion 28, 28a, 28b… Upper coil end part 29, 29a, 29b, 29c, 29d… Coil part in slot 30, 30, 30b… Lower coil end part 31… Insulating paper 32… Insulating paper 33… Tooth piece ring body A… Insulator mounting process B… Coil forming process C… Slot insulating paper mounting process D… Coil assembling process E… Yoke piece assembling process F… Coil end insulating paper mounting process G… Welding process

Claims

1. In a stator comprising a cylindrical stator core, an annular plate-shaped insulator disposed on an end face of the stator core, and a coil disposed circumferentially across a plurality of slots of the stator core, the stator core is composed of a plurality of radially disposed tooth pieces and a plurality of yoke pieces that annularly connect tip portions of these plurality of tooth pieces and form the slots on the inner side, and is characterized in that.

2. The stator according to claim 1, wherein recesses are formed in the plurality of tooth pieces, projections are formed in the insulator, and the recesses and the projections are configured to engage with each other.

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

4. An electric motor comprising the stator according to claim 1 or 2.

5. A rotary compressor, characterized in that an electric motor comprising the stator according to claim 1 or 2 and a rotary compression mechanism for driving the electric motor to generate high-pressure gas are mounted inside a sealed container.

6. A method for manufacturing the stator according to claim 2, an insulator mounting step of disposing the insulator at a position that becomes a lower end face of the stator, disposing the plurality of tooth pieces on respective projections of the insulator, and integrating them by concave-convex fitting, disposing another insulator from a position that becomes an upper end face of the stator, and integrating each of the projections and each of the recesses of the plurality of tooth pieces by concave-convex fitting; a coil forming step of winding a wire in a shape corresponding to the slot to form the coil; a coil mounting step of mounting the formed coil on the stator integrated in the insulator mounting step; a welding step of disposing the plurality of yoke pieces so as to cover the slit in a state where the coil is disposed in the slot, and welding the plurality of tooth pieces and the plurality of yoke pieces, the method for manufacturing a stator being characterized by including the steps.

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