CZ2022320A3 - Stator, rotary electric machine and compressor - Google Patents

Abstract

The stator (51) is obtained by winding a coil (55) around a circular stator core (80) with insulating material (57) in between. The core (80) comprises a plurality of split cores (5), i.e. a first split core (71) and a second split core (72) connected adjacent to each other. Each of the divided cores (5) at least partially comprises a set of plate-like first parts (11) and a set of plate-like second parts (12), which are alternately laminated at least in a certain part and include a yoke part (3d). The yoke part (3d) includes a connecting part (3f) at one end and a yoke end part (3e) at the other end. Each of the first split cores (71) and the adjacent one of the second split cores (72) are connected so as to be mutually rotatable around the connecting portion (3f) they have between them.

Description

Stator, rotary electric machine and compressor

Field of technology

The present invention relates to a stator, a rotary electric machine including a stator, and a compressor including a rotary electric machine, and in particular to a laminated core construction.

Current state of the art

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-180383

As a stator used in an existing rotary electric machine, a stator having a structure of closed slots is known (see e.g. patent document 1). The stator includes a plurality of split cores, each of which is formed from a plurality of laminated core materials and each includes a short side yoke portion and a tooth portion projecting toward the interior of the yoke portion. After the coil is wound around the tooth portion of each of the plurality of split cores, said plurality of split cores are arranged in a circle, and the adjacent yoke portions and the adjacent tooth portions abut each other or are joined and fixed by welding, gluing, or the like to form a structure with closed slits.

The stator described in Patent Document 1 comprises a circular stator core and coils. The stator ring core contains a set of split cores distributed radially with the center as the reference point. Each of the coils is wound around each of a plurality of split cores with insulating material between them. A plurality of split cores around which the coils are wound are arranged in a circle, while the abutting yoke portions and abutting tooth tip portions are abutted, connected, and fixed. As a result, the stator has a structure with closed slots. Subsequently, the connecting parts of the yoke parts and the connecting parts of the tooth tip sections are welded by laser welding (for example, YAG laser welding) or bonded with glue.

As described above, the closed-slot stator structure is configured in such a way that the coils are wound around the toothed portions of a plurality of split cores with an insulating material therebetween, and then said plurality of split cores are arranged in a circle, with adjacent yoke portions and adjacent sections the tips of the teeth are connected and fixed. This makes the coils wound around the toothed parts of the split cores quickly and easily with high density. Furthermore, the structure with closed slots is configured by connecting and fixing not only the yoke parts of the split cores, but also the tooth parts located on the inner peripheral side. Therefore, it is possible to prevent deformation of the stator even when the split cores are subjected to an electromagnetic force. Thanks to this, it is possible to realize a rotary electric machine with low noise and low vibrations.

The essence of the invention

According to the structure of the existing stator described in Patent Document 1, the connecting parts of the yoke parts and the connecting parts of the tooth tip sections are welded by laser welding or bonded with glue. Therefore, when the control of the inner/outer diameter of the split cores is insufficient during welding or bonding, the split cores will move apart, thereby deteriorating the circularity of the inner/outer diameter of the stator.

Further, the shape deviations of the split cores cause fluctuations in the gaps of the adjacent yoke parts and the gaps of the adjacent sections of the tooth tips.

The present invention is designed to solve the problems described above, and the object of the present invention is to provide a stator, a rotary electric machine and a compressor, which will be characterized by high precision joining on the inner diameter side and on the outer diameter side of the split cores and will include

- 1 CZ 2022-320 A3 high density coils made quickly and easily.

A stator according to one embodiment of the present invention is a stator obtained by winding a coil around a stator core having a circular shape, with an insulating material in between. The stator core contains a set of split cores. Said set of split cores includes a first split core and a second split core connected adjacent to each other, and is a bonded laminated core in which the split cores are connected and arranged in a ring. Each of the set of split cores at least partially comprises a set of first parts and a set of second parts, alternately laminated at least in a certain part. Said set of first parts and set of second parts each have a plate-like shape. Each of the plurality of first portions and the plurality of second portions includes a yoke portion, a tooth portion, and a tooth tip portion. The yoke portion includes a connecting portion at one end and a yoke end portion at the other end. The tooth part is integrated with the yoke part and protrudes from the center of the yoke part towards the inner peripheral side of the stator core. The tooth tip section is integrally formed at the front end of the inner peripheral side of the tooth part. The connecting part of the yoke part of each of the set of first parts is located at the end on the side opposite to the connecting part of the yoke part of each of the set of second parts. The connecting part of each of the set of first parts of each of the first split cores is sandwiched between the connecting parts of the set of second parts of the adjacent one of the second split cores, and rests on the end part of the yoke corresponding to the first part of the adjacent one of the second split cores. Each of the first split cores and an adjacent one of the second split cores are connected so as to be relatively rotatable about the connecting portion therebetween. The tooth tip section of each of the first split cores is at least in contact with or embedded in the tooth tip sections of the adjacent second split cores at both ends in the circumferential direction.

The rotary electric machine according to another embodiment of the present invention includes the stator described above.

A compressor according to yet another embodiment of the present invention includes the rotary electric machine described above and a compression mechanism driven by the rotary electric machine and configured to compress refrigerant.

According to an embodiment of the present invention, the stator core includes what is called a joint structure, in which the first split cores and the second split cores are rotationally connected in respective connecting portions. Therefore, the stator core has a circular shape after winding the coils around the toothed parts. As a result, coils can be wound quickly and easily with high density. Furthermore, in the stator core, thanks to the articulated structure, the accuracy of the placement of the split cores is improved. In addition, gap variation of adjacent tooth tip sections is reduced as the tooth tip sections come into contact with each other or slide into each other by relative rotation of the first split cores and the second split cores. Accordingly, in the stator core, the accuracy of joining the split cores on the inner diameter side and the outer diameter side is improved.

Clarification of drawings

Giant. 1 is an explanatory diagram of the construction in section of the compressor 1 in section according to embodiment 1.

Giant. 2 is a plan view showing the circular arrangement of the core 80 of the stator 51 in the electric motor unit 50 according to embodiment 1.

Giant. 3 is a plan view of the first part 11 except for the core pieces 3 forming the split cores 5 of the stator core 80.

Giant. 4 is a plan view of the second part 12 except for the core pieces 3 forming the split cores 5 of the stator core 80.

Giant. 5 is an enlarged view of the connecting part 5b shown in Fig. 2.

Giant. 6 is an enlarged cross-sectional view of the connection portion 5b of the stator core 80 according to embodiment 1.

-2CZ 2022-320 A3

Giant. 7 is an enlarged view of the vicinity of the end parts 5e of the sections 5c of the tips of the teeth from Fig. 2.

Giant. 8 is a plan view in a state when the stator core 80 and the stator case 4 51 are fixed.

Giant. 9 is an explanatory diagram of the positional relationship between the connecting portion 5b and the end surfaces 5g of the tooth tip sections 5c of any two adjacent split cores 5 of the stator core 80 according to Embodiment 1.

Giant. 10 is a diagram of the circular arrangement of the stator core 280 according to embodiment 2.

Giant. is an enlarged view of the vicinity of the end surfaces 205g of the tooth tip sections 205c in the stator core 80 of Fig. 10.

Examples of implementation of the invention

Below, the stator, rotary electric machine and compressor according to embodiment 1 will be described with reference to the drawings, etc. In the following drawings, including Fig. 1, the relative dimensional relationships, shapes, etc. of the individual components may differ from reality. Further, in the following drawings, the same or equivalent components are designated by the same reference numerals throughout the description. Furthermore, directional terms (such as "top", "bottom", "right", "left", "front" and "back") are used as needed to facilitate understanding; however, these terms are for description only and do not limit the arrangement and directions of the device or component. In the description, the positional relationships of the components, the spreading directions of the components, and the arrangement directions of the component basically indicate as they are when the device is installed in a usable state.

Execution 1

Giant. 1 is a cross-sectional explanatory diagram of the construction of the compressor 1 according to embodiment 1. The compressor 1 shown in Fig. 1 is used to compress a refrigerant, for example, in a refrigeration cycle device. The compressor 1 includes a compression mechanism unit 30, an electric motor unit 50, and a sealed container 60. The compression mechanism unit 30 compresses a fluid sucked in from the outside through a suction damper 40 and a suction pipe 41. The fluid in embodiment 1 is a gaseous refrigerant. The unit 30 of the compression mechanism is driven by the unit 50 of the electric motor. The sealed container 60 houses the compression mechanism unit 30 and the electric motor unit 50. Sealed vessel 60 is a pressure vessel. The high-pressure gas refrigerant compressed by the compression mechanism unit 30 is discharged from the compression mechanism unit 30 into the inside of the sealed container 60, and the high-temperature, high-pressure gas refrigerant is discharged from the discharge pipe 42 into the refrigerant circuit. Further, in the inner lower part of the sealed container 60, the cooling unit oil (not shown) is stored.

The sealed container 60 according to embodiment 1 includes a body section 61 having a cylindrical shape and a bottom section and an upper lid section 62 closing the opening port in the upper part of the body section 61. Section 61 of the body and section 62 of the upper cover are hermetically connected by a circumferential weld. The construction of the sealed container 60 shown in Fig. 1 is illustrative and not limited to this illustration.

The electric motor unit 50 is located slightly above the center of the sealed container 60 and includes a stator 51 and a rotor 52 arranged on the inner peripheral side of the stator 51. The outer peripheral surface of the stator 51 and the inner peripheral surface of the body section 61 are fixed, for example, by welding. The stator 51 is formed in a circular shape. The rotor 52 is arranged to rotate with a small gap from the inner peripheral surface of the stator 51.

A main shaft 53 is fitted into the rotor 52 and the rotor 52 rotates integrally with the main shaft. The main shaft 53 includes an eccentric part 54 at one end, so it serves as a crankshaft. The eccentric portion 54 is eccentric from the center axis L of the main shaft 53 and has a center axis C offset from the center axis L. The eccentric portion 54 rotates eccentrically about the center axis L when the rotor 52 rotates.

-3 CZ 2022-320 A3

The compression mechanism unit 30 includes a cylinder 20, a main bearing 31 and a sub bearing 32, and a rolling piston 22. The main bearing 31 and sub bearing 32 are arranged to face the upper and lower end surfaces of the cylinder 20, respectively, and also serve as end plates of the cylinder 20. The rolling piston 22 is housed inside the cylinder 20. The eccentric part 54 is inserted into the rolling piston 22. Furthermore, a lamella (not shown) dividing the inner space of the cylinder 20 into a suction chamber and a compression chamber is inserted into the lamella groove (not shown) of the cylinder 20. The cylinder 20, the main bearing 31 and the secondary bearing 32 are integrally connected, and the rolling piston 22, the cylinder 20, the eccentric part 54 and the plate are movably mounted in its inner space. The inner part including the rolling piston 22, the cylinder 20, the eccentric part 54 and the vane compresses the gaseous refrigerant sucked from the suction pipe 41 and discharges the compressed gaseous refrigerant into the inside of the sealed container 60 whenever the main shaft 53 rotates.

The compressor 1 further includes a suction damper 40 located on the outside of the sealed container 60. The suction damper 40 stores the low-pressure refrigerant flowing through the refrigerant circuit and divides the refrigerant into gas and liquid. Furthermore, the suction muffler 40 has a cross-sectional area larger than the cross-sectional area of the refrigerant pipe, thereby reducing noise.

The compressor 1 includes a suction pipe 41 sucking the gaseous refrigerant in the suction damper 40 into a sealed container 60 and a suction opening (not shown) leading the gaseous refrigerant sucked by the suction pipe 41 into the suction chamber inside the cylinder 20 of the unit 30 of the compression mechanism. The compressor 1 includes a discharge port (not shown) discharging the high-pressure gaseous refrigerant compressed in the compression chamber of the compression mechanism unit 30 into the space inside the sealed container 60. The compressor 1 includes a discharge pipe 42 discharging the high-pressure gaseous refrigerant inside the sealed container 60 out at the upper end of the sealed container 60 and sends high-pressure gaseous refrigerant to the refrigerant circuit.

Now, the compression of refrigerant by compressor E will be described. In compressor 1, the main shaft 53 integrated with the rotor 52 rotates by rotating the rotor 52, and the eccentric portion 54 rotates together with the rotation of the main shaft 53. When the eccentric portion 54 rotates, the rolling piston 22 also rotates and moves. inside the cylinder 20. In other words, the rolling piston 22 eccentrically rotates on the inner peripheral surface of the cylinder 20. As a result, the gaseous refrigerant is sucked from the suction tube 41 into the suction chamber in the cylinder 20, and the gaseous refrigerant is compressed in the compression chamber in the cylinder 20. the refrigerant compressed in the compression chamber is discharged into the space inside the sealed container 60 and is discharged out of the sealed container 60 through the discharge pipe 42.

The stator 51 comprises coils 55, each of which is obtained by winding a conductive wire around each of the teeth 5a of the magnetic field of the stator core 80 with an insulating material 57 placed between them. The stator 51 creates a magnetic field using the current supplied from the wire 56 and spins the rotor 52 by continuously changing the magnetic field. The rotor 52 rotates at a predetermined torque and a predetermined speed and transmits the driving force to the main shaft 53. In other words, the stator 51 and the rotor 52 form an electric motor unit 50, which is a rotary electric machine that converts electrical energy into a rotary driving force. The electric motor unit 50 transmits driving force to the compression mechanism unit 30 via the main shaft 53 to compress the refrigerant.

Giant. 2 is a plan view showing the circular arrangement of the core 80 of the stator 51 in the electric motor unit 50 according to embodiment 1. FIG. 2 is a diagram explaining the arrangement of the split cores 5 of the stator core 80 constituting the stator 51 according to embodiment 1. The stator core 80 includes a plurality of split cores 5. Both ends of the yoke portion 5d of each of the plurality of split cores 5 are connected to the adjacent split cores 5. At the front end of the tooth 5a of the magnetic field, a tooth tip section 5c is located, which protrudes toward the inner peripheral side from the yoke portion 5d of each of the split cores and protrudes to the sides of the extending direction of the magnetic field tooth 5a. Each of the end portions 5h of the tooth tip section 5c is in contact with the opposite end portion 5h of the tooth tip section 5c of the adjacent split core 5 and is positioned with a small gap from it.

The plurality of split cores 5 forming the stator core 80 includes the first split cores 71 and the second split cores 72. The first split cores 71 and the second split cores 72 are connected close to each other. The first split cores 71 and the second split cores 72 are arranged next to each other so as to perform an arc motion around

-4CZ 2022-320 A3 of the respective corresponding engagement parts 3b. As described above, each of the connecting portions 5b of the first split cores 71 and the second split cores 72 has what is called a joint structure. Said plurality of split cores 5 are bonded laminated cores each formed by laminating a plurality of plate-like core pieces 3 each made of magnetic material and bonded together.

Giant. 3 is a plan view of the first part of the 11 pieces 3 cores forming the split cores 5 of the stator core 80. Giant. 4 is a plan view of the second part of the 12 pieces 3 cores forming the split cores 5 cores 80 of the stator. Each of the set of split cores 5 at least partly includes alternately laminated plate-like first parts 11 and plate-like second parts 12. In embodiment 1, the first parts 11 and the second parts 12 have a symmetrical shape around the center cl of the tooth part 3a forming the tooth 5a of the magnetic pole of each split core 5.

Each of the first portion 11 and the second portion 12 has a yoke portion 3d, a tooth portion 3a, and a tooth tip portion 3c. The yoke portion 3d is located on the outer peripheral side of the stator core 80 and forms the yoke portion 5d of each divided core 5. The tooth portion 3a projects from the center of the yoke portion 3d toward the inner peripheral side of the stator core 80. The tooth tip section 3c represents the front end of the tooth part 3a. The tooth tip section 3c includes end portions 3h protruding in a right-left direction with respect to the direction in which the tooth portion 3a extends from the yoke portion 3d in the circumferential direction of the stator core 80 in Fig. 2. Each of the end portions 3h includes an end face 3g on front end.

As shown in Fig. 3 and Fig. 4 , the yoke portion 3d of each of the first portions 11 and the yoke portion 3d of each of the second portions 12 have a symmetrical shape with respect to the center cl. The yoke part 3d includes a connecting part 3f at one of the ends. The connecting part 3f has an edge part 3fb at the corner part 3fa on the outer peripheral side in a plane view, and the edge part 3fb is rounded into an arc shape. The corner part 3fa contains the engaging part 3b. The engaging part 3b is formed such that one of the surfaces of each piece of core 3 as a plate-like magnetic material forming the first part 11 or the second part 12 is recessed and the other surface protrudes. For example, the engaging part 3b is formed by semi-stamping sheet material.

Giant. 5 is an enlarged view of one connecting part 5b shown in Fig. 2. The connecting part 3f of each of the pieces 3 of the core forming the connecting part 5b is arranged to abut against the end part 3e of the yoke of the adjacent one of the split cores 5. The end part 3e of the yoke includes an arch part 3ea having an arch shape corresponding to the shape of the corner part 3fa of the connecting part 3f. The arcuate part 3ea has a recessed shape, in which the edge part 3fb is offset at the corner part 3fa of the connecting part 3f. The arc portion 3ea and the corresponding edge portion 3fb do not interfere with each other when each of the first portion 11 and the corresponding second portion 12 mutually rotate around the center of the engagement portion 3b. However, the arc portion 3ea and the corresponding edge portion 3fb are not necessarily concentric about the center of the engagement portion 3b if each of the first split core 7a and the corresponding second split core 72 can rotate and move with each other. In Fig. 5, in at least one of the set of connecting parts 5b of the set of split cores 5 in the stator core 80 shown in Fig. 2, the connecting part 3f and the corresponding end part 3e of the yoke abutting each other have a gap 3k between them, as shown in Fig. 5 .

Giant. 6 is an enlarged cross-sectional view of the connecting portion 5b of the stator core 80 according to Embodiment 1. In each of the connecting portions 5b of the first split cores 71 and the second split cores 72 forming the stator core 80, the first portions 11 and the second portions 12 alternately overlap, and the connecting portion 3f of each of the first parts 11 of each of the first split cores 71 is sandwiched between the connecting parts 3f of the second parts 12 of the adjacent one of the second split cores 72. The connecting part 3f of each of the first parts 11 of each of the first split cores 71 abuts on the end part 3e of the adjacent yoke of one of the first parts 11 in a direction parallel to the surface of the plates of the pieces 3 of the core.

As shown in Fig. 6, each of the engagement portions 3b has a recessed portion 3ba, recessed in the perpendicular direction, on one of the plate surfaces of the corresponding core piece 3, and a projecting portion 3bb. protruding in a perpendicular direction. In each of the connecting parts 3f of the first split cores 71 and the second split cores 72, the projecting part 3bb of one of the engaging parts 3b is fitted into the recessed part 3ba of the second engaging part 3b, thereby preventing the separation of each of the first parts 11 and the corresponding second part 12 in the direction

-5CZ 2022-320 A3 parallel to the surfaces of the plates of pieces of 3 cores. Each of the recessed portions 3ba and the corresponding protruding portion 3bb are preferably fitted into each other with a gap allowing each of the first split cores 71 and the corresponding second split core 72 to rotate and move relative to each other. Each of the engagement portions 3b is also referred to as a joint center because it serves as a center of rotation of the joint structure connecting each of the first split cores 71 and the corresponding second split core 72. Furthermore, the structure in which each of the first split cores 71 and the adjacent one of of the second split cores 72 can mutually rotate and move around the corresponding engagement part 3b in some cases referred to as a hinged structure.

Giant. 7 is an enlarged view of the vicinity of the end portions 5e of the tooth sections 5c of Fig. 2. Adjacent two of the end portions 5e of the tooth sections 5c of the stator core 80 are connected by abutting each other or fitting into each other. In other words, the tooth tip section 5c of each of the first split cores is at least partially in contact with the tooth tip sections 5c of the adjacent second split cores at both ends in the circumferential direction, or is thus fitted into them. In the core 80 of the stator 51, the tightest slot structure is formed by connecting or gluing the tooth tip sections 5c.

Giant. 8 is a plan view in a state when the stator core 80 and the stator case 4 51 are fixed. After the plurality of split cores 5 are linearly connected in the stator core 80, the respective teeth 5a of the magnetic poles of the respective split cores 5 are wrapped with wires. Subsequently, the split cores 5 are arranged in a circle, as shown in Fig. 2. Then, at least one of the set of connecting parts 5b of the set of split cores 5 contains a gap, as shown in Fig. 5. On the contrary, between no adjacent two of the end parts 5e of the sections 5c tooth tips number of split cores 5 no gap. Such an arrangement makes it possible to release the tension exerted by the sleeve 4 arranged outside the stator core 80 on the connecting part 5b of the yoke parts 5d of the stator core 80, and to suppress the deformation of the cores. It should be noted that the housing 4 is, for example, the stator housing 51 or the sealed container 60.

In each of the end portions 3h of the sections 3c of the tooth tips of the core pieces 3 forming the split cores 5, the thickness dimension in the radial direction in the state in which the plurality of split cores 5 are arranged in a circle is set to twice or more the thickness of the plate material, that is, the thickness dimension in direction of the central axis of the 3 core pieces. Therefore, the influence of point deformation due to pressing is suppressed in the core pieces 3, and the end parts 3h of the tooth tip sections 3c are arranged in a corresponding positional relationship.

Giant. 9 is an explanatory diagram of the positional relationship between the connecting portion 5b and the end surfaces 5g of the tooth tip sections 5c of any two adjacent divided cores 5 of the stator core 80 according to Embodiment 1. The end surfaces 5g of the tooth tip sections 5c of the stator core 80 are arranged in a concentric circle around the center of the engagement portion 3b pieces of 3 core forming the connecting part 5b. Therefore, in the stator core 80, after the magnetic pole teeth 5a are wrapped with wires, the end surfaces 5g of the tooth tip sections 5c of the set of split cores 5 can be easily connected with high precision.

Further, with respect to the end surfaces 5g of the tooth tip sections 5c of the stator core 80, the case where no gap is arranged between any two of the adjacent end surfaces 3g of the core pieces 3 laminated in the direction of the center axis of the stator core 80 is considered, and the case where the part without space and the part with space are mixed. In the case where a part without a gap and a part with a gap are mixed, the magnetic flux is interrupted in the sections 3c of the tooth tips in the part without any gap. Further, the stiffness of the stator core 80 increases as the number of non-gap parts increases. This prevents deformation of the stator core 80 caused by the force exerted on the stator 51. This ultimately reduces the vibration of the electric motor unit 50 caused by rotation.

When the stator 51 according to the embodiment 1 is installed on the compressor 1, the resistance of the refrigerant flow path near the end faces 5g of the sections 5c of the tooth tips of the set of split cores 5 in the stator core 80 is reduced. This eliminates the stagnation of the cooling unit oil on the inner peripheral side of the stator 51 and improves the circulation of the cooling unit oil inside the compressor 1. When the stagnation of the cooling unit oil on the inner peripheral side of the stator 51 is eliminated, the rotational load on the rotor 52 is reduced, resulting in improved efficiency 50 electric motor units. Furthermore, the circulation of the cooling unit oil inside the sealed container 60 is improved, which facilitates the supply of the cooling unit oil to the unit 30

-6CZ 2022-320 A3 compression mechanism. Thanks to this, the wear of the compression mechanism unit 30 caused by abrasion, etc., can be reduced.

Next, the stator 51 is formed circularly in a state in which the coils 55 are wound around the teeth 5a of the magnetic poles of the set of split cores 5 with an insulating material 57 between them, and then the adjacent yoke portions 5d and the adjacent portions 5c of the tips of the teeth of the set of split cores 5 are connected and fixed by butt connection, etc. As a result, the set of divided cores 5 forms a stator 51 having a structure of closed slots. This allows the coils 55 to be quickly and easily wound around the teeth 5a of the magnetic poles of the respective high density split cores 5.

Execution 2

In embodiment 2, the construction of the connection sections 5c of the tooth tips of the core 80 of the stator 51 according to embodiment 1 is changed. In Embodiment 2, elements not specifically described are similar to those of Embodiment 1, and the same functions and configurations as in Embodiment 1 are described using the same reference numerals.

Giant. 10 is a diagram of the circular arrangement of the stator core 280 according to embodiment 2. FIG. is an enlarged view of the vicinity of the end surfaces 205g of the sections 205c of the tips of the teeth of the stator core 80 from Fig. 10. The sections 205c of the tips of the teeth of the set of split cores 205 of the stator core 80 according to embodiment 2 are connected by means of a combination of depressions and protrusions formed on the end surfaces 203g of the sections 203c of the tips of the teeth of the respective pieces 203 of the core.

The end surface 203ga of the tooth tip section 203c of each of the core pieces 203 includes a projecting portion 203p. Further, the end surface 203gb of the tooth tip section 203c of each of the core pieces 203 includes a concave portion 203q. into which the opposite projecting part 203p fits. The core pieces 203 forming the split cores 5 of the stator core 280 have each tooth tip section 203c formed in the same shape. In the stator core 280, the projecting portions and the concave portions are combined and connected as in the case of the tooth tip sections 203c. This improves the fixing strength of the adjacent sections 205c of the tooth tips of the split cores 205 and improves the rigidity. Accordingly, the deformation of the stator core 280 caused by the force exerted on the stator 51 is limited. This ultimately reduces the vibration of the electric motor unit 50 caused by rotation.

Each of the set of split cores 205 may contain only 203 core pieces or may contain mixed 3 core pieces according to embodiment 1 and 203 core pieces. In the case of the split cores 205, each of which contains a mixture of core pieces 3 and core pieces 203, with respect to the tooth tip sections 205c of the split cores 205 of the stator core 280, a part with a partial gap and a part without a gap are mixed in the axial direction of the stator 51. With such an arrangement it is possible in the compressor 1 to set the gap between the sections 205c of the tips of the teeth of any two adjacent split cores 205 in a suitable way. This makes it possible to improve the stiffness of the stator 51 while meeting the target efficiency, noise and vibration of the compressor 1.

Claims (7)

1. A stator (51) obtained by winding a coil (55) around a stator core (80) having a circular shape, with an insulating material (57) between them, characterized in that the stator core (80) comprises a plurality of split cores (5), said the set of split cores (5) includes the first split cores (71) and the second split cores (72) joined adjacent to each other to form a bonded laminated core in which the split cores (5) are joined and arranged in a circle, each of the set of split cores the cores (5) at least partially comprise a set of first parts (11) and a set of second parts (12) which are alternately laminated at least in a certain part, wherein the set of first parts (11) and the set of second parts (12) each have a plate-like shape, each of said set of first parts (11) and set of second parts (12) comprises a yoke part (3d), a tooth part (3a) and a tooth tip section (3c), wherein the yoke part (3d) contains a connecting part (3f) at one end and the end part (3e) of the caliper at the other end, the tooth part (3a) is integrated with the caliper no. portion (3d) and protrudes from the center of the yoke portion (3d) toward the inner peripheral side of the stator core (80), and the tooth tip portion (3c) is integrally located at the front end on the inner peripheral side of the tooth portion (3a), the connecting portion (3f ) of the yoke part (3d) of each of the set of first parts (11) is located at the end on the side opposite to the connecting part (3f) of the yoke (3d) part of each of the set of second parts (12), the connecting part (3f) of each of the set of first part (11) of each of the first split cores (71) is sandwiched between the connecting parts (3f) of the set of second parts (12) adjacent to one of the second split cores (72), and rests on the end part (3e) of the yoke corresponding to the first part ( 11) adjacent one of the second split cores (72), each of the first split cores (71) and the adjacent one of the second split cores (72) are connected so as to be mutually rotatable around the connecting portion (3f) between them, and the section ( 3c) the tip of the tooth of each of the first split cores (71) is at least partially in con tact with the sections (3c) of the tips of the teeth of the adjacent second split cores (72) at both ends in the circumferential direction or is inserted into them in this way. 2. A stator (51) according to claim 1, characterized in that the stator core (80) comprises a gap (3k) between each of the set of first parts (11) of each of the first split cores (71) and the corresponding first part of an adjacent one of the second split cores (72). 3. The stator (51) according to claim 1 or 2, characterized in that in each of the end parts (3h) of the sections (3c) of the tooth tips of the set of first parts (11) and the set of second parts (12) the thickness dimension in the radial of the direction of the stator core (80) twice or more of the thickness dimension in the direction of the center axis (C) of the stator core (80). 4. The stator (51) according to any one of claims 1 to 3, characterized in that each of the connecting parts (3f) of the set of first parts (11) and the set of second parts (12) includes an engaging part (3b) that includes a projecting part (3bb) on one surface and the recessed part (3ba) on the other surface, and each of the connecting parts (3f) of the set of first parts (11) and the set of second parts (12) is connected by fitting the projecting part (3bb) of each of the set of first parts (11) into the recessed part (3ba) of the corresponding second part, and by fitting the protruding part (3bb) of each of the plurality of second parts (12) into the recessed part (3ba) of the corresponding first part (11). 5. The stator (51) according to claim 4, characterized in that the end part (3h) of the tooth tip section (3c) of each of the first split cores (72) and the opposite end part of the tooth tip section (3c) of the adjacent one of the second split cores (72) are located on a concentric circle around the center of the respective engaging part (3b). A rotary electric machine comprising a stator (51) according to any one of claims 1 to 5. 7. Compressor (1), including: a rotary electric machine according to claim 6; and a compression mechanism driven by said rotary electric machine and configured to compress the refrigerant.