CN106981935B

CN106981935B - Stator core, compressor, and refrigeration cycle device

Info

Publication number: CN106981935B
Application number: CN201610893813.7A
Authority: CN
Inventors: 熊谷一弥; 风间修; 奥川贞美; 岩边刚仙; 荒井利夫
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2015-10-15
Filing date: 2016-10-13
Publication date: 2020-04-10
Anticipated expiration: 2036-10-13
Also published as: CZ2018174A3; KR20180037040A; JPWO2017064782A1; WO2017064782A1; CN106981935A; CN109936225A; JP6395948B2; KR102018472B1; CN206302218U

Abstract

In a stator core, a compressor, and a refrigeration cycle device, a connecting core (60A) is a divided core having a structure in which a 1 st electromagnetic steel plate (71) and a 3 rd electromagnetic steel plate (73) are stacked in an axial direction. The connecting core (60B) is a divided core having a structure in which a 2 nd magnetic steel sheet (72) and a 4 th magnetic steel sheet (74) are stacked in the axial direction. The 3 rd magnetic steel sheet (73) has a portion overlapping the 1 st magnetic steel sheet (71) and a portion provided with a projection (81) having elasticity and extending obliquely in a direction close to the 1 st magnetic steel sheet (71) and projecting further outward than the 1 st magnetic steel sheet (71). The 4 th magnetic steel sheet (74) has a portion that overlaps the 2 nd magnetic steel sheet (72) and a portion (4B) that is provided with a hole (82) and protrudes outward beyond the 2 nd magnetic steel sheet (72). When the connecting core (60A) and the connecting core (60B) are connected, the protrusion (81) is fitted into the hole (82).

Description

Stator core, compressor, and refrigeration cycle device

Technical Field

The invention relates to a stator core, a compressor and a refrigeration cycle device.

Background

As a method of manufacturing a stator core of a motor by connecting a plurality of divided cores, a technique described in patent document 1 is known. In this technique, a convex portion is formed at one of the division boundary portions of each of the divided cores, and a concave portion is formed at the other division boundary portion. The convex portion of one of the 2 connected divided cores is formed with: a locking piece protruding along the stacking thickness direction; and a locking groove for receiving the locking piece formed in the recess of the other divided core. The recess of one of the divided cores is formed with: a locking piece protruding along the stacking thickness direction; and a locking groove for receiving the locking piece formed on the convex part of the other divided core. The protruding portions of one of the divided cores are fitted into the recessed portions of the other divided core, and the protruding portions of the other divided core are fitted into the recessed portions of the one divided core, whereby the locking pieces formed on the protruding portions are received in the locking grooves formed in the recessed portions, and the two divided cores are connected together.

Patent document 1: japanese laid-open patent publication No. 2009 and 118676

In the technique described in patent document 1, 2 locking pieces protruding in different directions are received in the locking grooves at each of the connection portions of the divided cores. That is, the divided cores are coupled to each other by only one locking piece in one direction. Therefore, the coupling force between the divided cores is weak.

Disclosure of Invention

The invention aims to improve the binding force between the divided parts of a stator core.

A stator core according to an aspect of the present invention includes:

a 1 st electromagnetic steel sheet;

a 2 nd electromagnetic steel sheet;

a 3 rd electromagnetic steel sheet having: a portion overlapping the 1 st electromagnetic steel sheet; and a portion protruding outward from the 1 st magnetic steel sheet, the portion being provided with a projection that has elasticity and extends obliquely in a direction approaching the 1 st magnetic steel sheet, and a tip of the 3 rd magnetic steel sheet protruding outward from the 1 st magnetic steel sheet being adjacent to the 2 nd magnetic steel sheet; and

a 4 th electromagnetic steel sheet having: a portion overlapping the 2 nd electromagnetic steel sheet; and a portion protruding outward from the 2 nd magnetic steel sheet, in which a hole into which the projection of the 3 rd magnetic steel sheet is fitted is provided, and a tip of the 4 th magnetic steel sheet protruding outward from the 2 nd magnetic steel sheet is adjacent to the 1 st magnetic steel sheet,

the combinations of the 1 st magnetic steel sheet, the 2 nd magnetic steel sheet, the 3 rd magnetic steel sheet, and the 4 th magnetic steel sheet are stacked in the same orientation.

In the present invention, a combination of the 1 st magnetic steel sheet, the 2 nd magnetic steel sheet, the 3 rd magnetic steel sheet having the projection, and the 4 th magnetic steel sheet having the projection to which the 3 rd magnetic steel sheet is fitted are laminated in the same orientation. That is, at least in one direction, the divided portions of the stator core are coupled to each other by 2 or more protrusions. Thus, the coupling force between the divided portions of the stator core is strong.

Drawings

Fig. 1 is a circuit diagram of a refrigeration cycle apparatus according to embodiment 1.

Fig. 2 is a circuit diagram of the refrigeration cycle apparatus according to embodiment 1.

Fig. 3 is a longitudinal sectional view of the compressor according to embodiment 1.

Fig. 4 is a plan view of a stator core according to embodiment 1.

Fig. 5 is a plan view and a partially enlarged view of an electromagnetic steel sheet forming a divided core according to embodiment 1.

Fig. 6 is a plan view and a partially enlarged view of an electromagnetic steel sheet forming a divided core according to embodiment 1.

Fig. 7 is a partial cross-sectional view of a divided core according to embodiment 1.

Fig. 8 is a partial cross-sectional view and a partial vertical cross-sectional view showing a step of connecting the divided cores according to embodiment 1.

Fig. 9 is a partial cross-sectional view and a partial vertical cross-sectional view showing a step of connecting the divided cores according to embodiment 1.

Fig. 10 is a partial cross-sectional view and a partial vertical cross-sectional view showing a step of connecting the divided cores according to embodiment 1.

Fig. 11 is a partial cross-sectional view and a partial vertical cross-sectional view showing a step of connecting the divided cores according to embodiment 1.

Fig. 12 is a partial cross-sectional view and a partial vertical cross-sectional view of a divided core according to a modification of embodiment 1.

Fig. 13 is a partial cross-sectional view of a divided core according to embodiment 2.

Fig. 14 is a plan view of holes and projections of an electromagnetic steel sheet forming a divided core according to embodiment 2.

Fig. 15 is a partial cross-sectional view of a stator core segment according to embodiment 3.

Fig. 16 is a plan view of a stator core according to embodiment 4.

Fig. 17 is a plan view and a partial enlarged view of an electromagnetic steel sheet forming a segment of a stator core according to embodiment 4.

Fig. 18 is a plan view and a partial enlarged view of an electromagnetic steel sheet forming a segment of a stator core according to embodiment 4.

Fig. 19 is a partial cross-sectional view of a stator core segment according to embodiment 4.

Fig. 20 is a partial cross-sectional view and a partial vertical sectional view of a stator core segment according to embodiment 4.

Fig. 21 is a partial cross-sectional view of a stator core segment according to embodiment 5.

Fig. 22 is a partial cross-sectional view and a partial vertical sectional view of a stator core segment according to embodiment 5.

Description of the reference numerals

10: a refrigeration cycle device; 11: a refrigerant circuit; 12: a compressor; 13: a four-way valve; 14: a 1 st heat exchanger; 15: an expansion mechanism; 16: a 2 nd heat exchanger; 17: a control device; 20: a closed container; 21: a suction tube; 22: a discharge pipe; 23: a suction muffler; 24: a terminal; 25: a wire; 30: a compression mechanism; 31: a cylinder; 32: a piston; 33: a main bearing; 34: a secondary bearing; 35: a discharge muffler; 40: a motor; 41: a stator; 42: a rotor; 43: a stator core; 44: a winding; 45: an insulating member; 46: a rotor core; 48: a permanent magnet; 49: a through hole; 50: a crankshaft; 51: an eccentric shaft portion; 52: a main shaft portion; 53: an auxiliary shaft portion; 60: dividing the iron core; 60A: a connecting iron core; 60B: a connecting iron core; 61: teeth; 62: a back yoke; 71: a 1 st electromagnetic steel sheet; 72: a 2 nd electromagnetic steel sheet; 73: a 3 rd electromagnetic steel sheet; 74: a 4 th electromagnetic steel sheet; 75: a 5 th electromagnetic steel sheet; 76: a 6 th electromagnetic steel sheet; 77: a 7 th electromagnetic steel sheet; 78: a 8 th electromagnetic steel sheet; 81: a protrusion; 82: an aperture; 83: a protrusion; 84: and (4) a hole.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals. In the description of the embodiments, the description of the same or corresponding parts will be omitted or simplified as appropriate. The structure of the device, the apparatus, the member, and the like can be appropriately changed in terms of material, shape, size, and the like within the scope of the present invention.

Embodiment 1.

The configuration of the refrigeration cycle apparatus 10 according to the present embodiment will be described with reference to fig. 1 and 2.

Fig. 1 shows the refrigerant circuit 11 during cooling operation. Fig. 2 shows the refrigerant circuit 11 during heating operation.

The refrigeration cycle apparatus 10 is an air conditioner in the present embodiment, but may be an apparatus other than an air conditioner such as a refrigerator or a heat pump cycle apparatus.

The refrigeration cycle apparatus 10 includes a refrigerant circuit 11 through which a refrigerant circulates. The refrigeration cycle apparatus 10 further includes a compressor 12, a four-way valve 13, a 1 st heat exchanger 14 serving as an outdoor heat exchanger, an expansion mechanism 15 serving as an expansion valve, and a 2 nd heat exchanger 16 serving as an indoor heat exchanger. The compressor 12, the four-way valve 13, the 1 st heat exchanger 14, the expansion mechanism 15, and the 2 nd heat exchanger 16 are connected to the refrigerant circuit 11.

The compressor 12 compresses a refrigerant. The four-way valve 13 switches the flow direction of the refrigerant between the cooling operation and the heating operation. The 1 st heat exchanger 14 operates as a condenser during the cooling operation, and radiates heat from the refrigerant compressed by the compressor 12. That is, the 1 st heat exchanger 14 performs heat exchange using the refrigerant compressed by the compressor 12. The 1 st heat exchanger 14 operates as an evaporator during the heating operation, and heats the refrigerant by exchanging heat between the outdoor air and the refrigerant expanded by the expansion mechanism 15. The expansion mechanism 15 expands the refrigerant that has radiated heat in the condenser. The 2 nd heat exchanger 16 operates as a condenser during the heating operation, and dissipates heat from the refrigerant compressed by the compressor 12. That is, the 2 nd heat exchanger 16 performs heat exchange using the refrigerant compressed by the compressor 12. The 2 nd heat exchanger 16 operates as an evaporator during the cooling operation, and heats the refrigerant by exchanging heat between the indoor air and the refrigerant expanded by the expansion mechanism 15.

The refrigeration cycle apparatus 10 further includes a control device 17.

Specifically, the control device 17 is a microcomputer. In fig. 1 and 2, only the connection between the control device 17 and the compressor 12 is shown, but the control device 17 is connected not only to the compressor 12 but also to each unit connected to the refrigerant circuit 11. The control device 17 monitors or controls the state of each unit.

As the refrigerant circulating through the refrigerant circuit 11, R32 refrigerant, R290 (propane) refrigerant, R407C refrigerant, R410A refrigerant, R744 (CO) refrigerant can be used₂) Refrigerant, R1234yf refrigerant, and the like.

The structure of the compressor 12 according to the present embodiment will be described with reference to fig. 3.

Fig. 3 shows a longitudinal section of the compressor 12.

The compressor 12 is a hermetic compressor in the present embodiment. The compressor 12 is specifically a single-cylinder rotary compressor, but may be a two-or more-cylinder rotary compressor, a scroll compressor, or a reciprocating compressor.

The compressor 12 includes a closed casing 20, a compression mechanism 30, a motor 40, and a crankshaft 50.

The closed casing 20 is provided with: a suction pipe 21 for sucking a refrigerant; and a discharge pipe 22 for discharging the refrigerant.

The compression mechanism 30 is housed in the closed casing 20. Specifically, the compression mechanism 30 is provided at the inner lower portion of the closed casing 20. The compression mechanism 30 is driven by a motor 40. The compression mechanism 30 compresses the refrigerant sucked into the suction pipe 21.

The motor 40 is also housed in the closed casing 20. Specifically, the motor 40 is provided at an inner upper portion of the closed casing 20. The motor 40 is a motor with concentrated windings in the present embodiment, but may be a motor with distributed windings.

The refrigerator oil for lubricating the sliding portions of the compression mechanism 30 is stored in the bottom portion of the closed casing 20. The refrigerating machine oil is pumped up by an oil pump provided at a lower portion of the crankshaft 50 in accordance with the rotation of the crankshaft 50, and is supplied to each sliding portion of the compression mechanism 30. As the refrigerating machine oil, POE (polyol ester), PVE (polyvinyl ether), AB (alkylbenzene), and the like are used as synthetic oils.

The details of the motor 40 will be described below.

The motor 40 is a brushless dc (Direct Current) motor in the present embodiment, but may be a motor other than a brushless dc motor such as an induction motor.

The motor 40 includes a stator 41 and a rotor 42.

The stator 41 is cylindrical and fixed in contact with the inner circumferential surface of the closed casing 20. The rotor 42 is cylindrical and is disposed inside the stator 41 with a gap of 0.3 mm to 1.0 mm.

The stator 41 includes a stator core 43 and a winding 44. The stator core 43 is manufactured by punching a plurality of electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm, which contain iron as a main component, into a predetermined shape, laminating the sheets in the axial direction, and fixing the sheets by caulking, welding, or the like. The stator core 43 has an outer diameter larger than an inner diameter of the middle portion of the sealed container 20, and is fixed to the inside of the sealed container 20 by heat-sealing. The winding 44 is wound around the stator core 43. Specifically, the winding 44 is wound around the stator core 43 through the insulating member 45 in a concentrated winding manner. The winding 44 is composed of a core wire and at least one coating film covering the core wire. In the present embodiment, the material of the core wire is copper. The material of the coating film is AI (amide imide)/EI (ester imide). The insulating member 45 is made of PET (polyethylene terephthalate). The core wire may be made of aluminum. The insulating member 45 may be made of PBT (polybutylene terephthalate), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), PTFE (polytetrafluoroethylene), LCP (liquid crystal polymer), PPS (polyphenylene sulfide), or phenol resin. One end of the lead wire 25 is connected to the winding 44.

The rotor 42 includes a rotor core 46 and a permanent magnet 48. The rotor core 46 is formed by punching a plurality of electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm, which are mainly composed of iron, into a predetermined shape, laminating the electromagnetic steel sheets in the axial direction, and fixing the laminated electromagnetic steel sheets by caulking, welding, or the like, as in the stator core 43. The permanent magnets 48 are inserted into a plurality of insertion holes formed in the rotor core 46. The permanent magnet 48 forms a magnetic pole. As the permanent magnet 48, a ferrite magnet or a rare-earth magnet is used.

A shaft hole into which the main shaft portion 52 of the crankshaft 50 is thermally fitted or press-fitted is formed at the center of the rotor core 46 in a plan view. A plurality of through holes 49 penetrating in the axial direction are formed around the shaft hole of the rotor core 46. Each through hole 49 is one of the paths of the gas refrigerant discharged from the discharge muffler 35 described later to the space in the closed casing 20.

When the motor 40 is an induction motor, conductors made of aluminum, copper, or the like are filled or inserted into a plurality of slots formed in the rotor core 46, although not shown. Further, a cage winding is formed with end rings to short-circuit both ends of the conductor.

A terminal 24 connected to an external power source such as an inverter device is attached to the top of the sealed container 20. The terminal 24 is specifically a glass terminal. In the present embodiment, the terminal 24 is fixed to the sealed container 20 by welding. The other end of the lead wire 25 is connected to the terminal 24. Thereby, the terminal 24 is electrically connected to the winding 44 of the motor 40.

A discharge pipe 22 having both ends open in the axial direction is further attached to the top of the closed casing 20. The gas refrigerant discharged from the compression mechanism 30 is discharged from the space in the closed casing 20 to the external refrigerant circuit 11 through the discharge pipe 22.

The compression mechanism 30 will be described in detail below.

The compression mechanism 30 includes a cylinder 31, a piston 32, a main bearing 33, a sub bearing 34, and a discharge muffler 35.

The inner periphery of the cylinder 31 is circular in plan view. A cylinder chamber, which is a circular space in a plan view, is formed inside the cylinder 31. A suction port for sucking the gas refrigerant from the refrigerant circuit 11 is provided on the outer peripheral surface of the cylinder 31. The refrigerant sucked from the suction port is compressed in the cylinder chamber. The cylinder 31 is open at both axial ends.

The piston 32 is annular. Thereby, the inner and outer peripheries of the piston 32 are circular in plan view. The piston 32 eccentrically rotates within the cylinder chamber. The piston 32 is slidably fitted to an eccentric shaft 51 of a crankshaft 50 constituting a rotation shaft of the piston 32.

Although not shown, the cylinder 31 is provided with vane grooves that are continuous with the cylinder chamber and extend in the radial direction. A back pressure chamber, which is a circular space in plan view connected to the vane groove, is formed outside the vane groove. In the vane groove, a vane for dividing the cylinder chamber into a suction chamber of low pressure and a compression chamber of high pressure is provided. The vanes are in a plate shape with the front end being rounded. The vane is always pressed against the piston 32 by a vane spring provided in the back pressure chamber. Since the pressure in the sealed container 20 is high, when the compressor 12 starts operating, a force generated by a difference between the pressure in the sealed container 20 and the pressure in the cylinder chamber acts on the back surface of the vane, which is the surface of the vane on the back pressure chamber side. Therefore, the leaf spring is mainly used for the following purposes: when the compressor 12 is started up without a difference between the pressures in the closed casing 20 and the cylinder chamber, the vane is pressed against the piston 32.

The main bearing 33 has an inverted T shape when viewed from the side. The main bearing 33 is slidably fitted to a main shaft portion 52 which is a portion of the crankshaft 50 above the eccentric shaft portion 51. The main bearing 33 closes the cylinder chamber of the cylinder 31 and the upper side of the vane groove.

The sub-bearing 34 is T-shaped when viewed from the side. The sub bearing 34 is slidably fitted to a sub shaft portion 53 which is a portion of the crankshaft 50 below the eccentric shaft portion 51. The sub-bearing 34 closes the cylinder chamber of the cylinder 31 and the lower side of the vane groove.

The main bearing 33 and the sub bearing 34 are fixed to the cylinder 31 by fasteners such as bolts, and support a crankshaft 50 as a rotation shaft of the piston 32.

Although not shown, the main bearing 33 is provided with a discharge port for discharging the refrigerant compressed in the cylinder chamber to the refrigerant circuit 11. The discharge port is located at a position connected to the compression chamber when the cylinder chamber is partitioned into the suction chamber and the compression chamber by the vane. A discharge valve that openably closes a discharge port is attached to the main bearing 33.

The discharge muffler 35 is mounted on the outer side of the main bearing 33. The high-temperature and high-pressure gas refrigerant discharged through the discharge valve enters the discharge muffler 35 once, and is discharged from the discharge muffler 35 into the space in the closed casing 20. The discharge port and the discharge valve may be provided in the sub-bearing 34 or both the main bearing 33 and the sub-bearing 34. The discharge muffler 35 is mounted on the outside of the bearing provided with the discharge port and the discharge valve.

A suction muffler 23 is provided beside the hermetic container 20. The suction muffler 23 sucks low-pressure gas refrigerant from the refrigerant circuit 11. The suction muffler 23 suppresses direct entry of the liquid refrigerant into the cylinder chamber of the cylinder 31 in the case where the liquid refrigerant is returned. Suction muffler 23 is connected to a suction port provided on the outer peripheral surface of cylinder 31 via suction pipe 21. The main body of the suction muffler 23 is fixed to the side surface of the hermetic container 20 by welding or the like.

In the present embodiment, the material of the cylinder 31, the main bearing 33, and the sub-bearing 34 is sintered steel, but gray cast iron or carbon steel may be used. The piston 32 is made of alloy steel containing chromium or the like. The blade is made of high-speed tool steel.

Although not shown, in the case where the compressor 12 is a rotary compressor of a swing type, the vane is provided integrally with the piston 32. When the crankshaft 50 is driven, the vane advances and retreats along the groove of the support body rotatably attached to the piston 32. The vane oscillates and advances and retreats in the radial direction in accordance with the rotation of the piston 32, thereby dividing the interior of the cylinder chamber into a compression chamber and a suction chamber. The support body is composed of two columnar components with semicircular cross sections. The support body is rotatably fitted into a circular holding hole formed in an intermediate portion between the suction port and the discharge port of the cylinder 31.

The operation of the compressor 12 will be described below.

Electric power is supplied from the terminal 24 to the stator 41 of the motor 40 via the lead wire 25. As a result, current flows through the winding 44 of the stator 41, and magnetic flux is generated from the winding 44. The rotor 42 of the motor 40 rotates by the action of the magnetic flux generated from the winding 44 and the magnetic flux generated from the permanent magnet of the rotor 42. The crankshaft 50 fixed to the rotor 42 rotates by the rotation of the rotor 42. As the crankshaft 50 rotates, the piston 32 of the compression mechanism 30 eccentrically rotates in the cylinder chamber of the cylinder 31 of the compression mechanism 30. A space between the cylinder 31 and the piston 32, i.e., a cylinder chamber, is divided into a suction chamber and a compression chamber by a vane. As the crankshaft 50 rotates, the volume of the suction chamber and the volume of the compression chamber change. In the suction chamber, the volume gradually increases, and thereby low-pressure gas refrigerant is sucked from suction muffler 23. In the compression chamber, the volume is gradually reduced, whereby the gas refrigerant therein is compressed. The compressed high-pressure high-temperature gas refrigerant is discharged from the discharge muffler 35 into the space in the closed casing 20. The discharged gas refrigerant is also discharged to the outside of the sealed container 20 from the discharge pipe 22 located at the top of the sealed container 20 by the motor 40. The refrigerant discharged to the outside of the closed casing 20 passes through the refrigerant circuit 11 and returns to the suction muffler 23 again.

Hereinafter, the structure of the stator core 43 provided in the stator 41 of the motor 40, the steps for realizing the structure, and the effects obtained by the structure will be described in order.

Description of the construction

The structure of the stator core 43 will be described with reference to fig. 4.

The stator core 43 has a structure in which a plurality of divided cores 60 are connected in the circumferential direction. The "circumferential direction" is the same direction as the rotation direction of the rotor 42 provided inside the stator core 43 when the motor 40 is configured to include the stator core 43. The number of the divided cores 60 may be any number, but in the present embodiment, is 9.

The 9 divided cores 60 include 1 coupling core 60A and 1 coupling core 60B. The number of the coupled cores 60A may be any number, and 2 or more divided cores 60 may correspond to the coupled cores 60A. The number of the coupled cores 60B is the same as the number of the coupled cores 60A, and 2 or more of the divided cores 60 may correspond to the coupled cores 60B. When 2 or more of the divided cores 60 correspond to the connecting core 60A, or when 2 or more of the divided cores 60 correspond to the connecting core 60B, there may be a divided core 60 that serves as both the connecting core 60A and the connecting core 60B.

Each of the divided cores 60 has a structure in which the teeth 61 and the back yoke 62 are formed integrally. The adjacent divided cores 60 are coupled to each other by coupling the back yokes 62 to each other. As a method of connecting the connection core 60A and the connection core 60B, a method described later is used, but as a method of connecting the divided cores 60, at least one of which does not correspond to the connection core 60A or the connection core 60B, any method can be used.

In each of the divided cores 60, the teeth 61 extend from the radially inner side of the back yoke 62. The teeth 61 are formed in a shape extending radially inward from the root with a constant width and widening at the tip. The winding 44 is wound around a portion of the tooth 61 extending with a constant width. When a current flows through the winding 44, the teeth 61 around which the winding 44 is wound become magnetic poles. The direction of the magnetic poles is determined by the direction of the current flowing in the winding 44.

The structure of the magnetic steel sheets forming the coupled

cores

60A and 60B will be described with reference to fig. 5, 6, and 7.

The coupled core 60A is a divided core 60 having a structure in which a 1 st magnetic steel sheet 71 and a 3 rd magnetic steel sheet 73 are stacked in the axial direction. Specifically, the coupling core 60A has a structure in which the 1 st magnetic steel sheet 71 and the 3 rd magnetic steel sheet 73 are alternately arranged in the axial direction one by one. The "axial direction" is the same direction as the rotation axis direction of the rotor 42 provided inside the stator core 43 when the motor 40 is configured to include the stator core 43. Fig. 5 shows the shape of the 1 st magnetic steel sheet 71, and shows the connection portion of the 1 st magnetic steel sheet 71 in an enlarged manner. Fig. 6 shows the shape of the 3 rd magnetic steel plate 73, and shows the connection portion of the 3 rd magnetic steel plate 73 in an enlarged manner. Fig. 7 shows the connection portion between the 1 st magnetic steel sheet 71 and the 3 rd magnetic steel sheet 73 in any 4 consecutive layers L1 to L4. The number of stacked layers of the 1 st magnetic steel sheet 71 and the 3 rd magnetic steel sheet 73 is preferably more than 4, but only 4 layers L1 to L4 are shown here for convenience of description.

The coupled core 60B is a divided core 60 having a structure in which a 2 nd magnetic steel sheet 72 and a 4 th magnetic steel sheet 74 are stacked in the axial direction. Specifically, the coupling core 60B has a structure in which the 2 nd magnetic steel sheet 72 and the 4 th magnetic steel sheet 74 are alternately arranged in the axial direction one by one. Fig. 5 shows the shape of the 4 th electromagnetic steel plate 74, and shows the connection portion of the 4 th electromagnetic steel plate 74 in an enlarged manner. Fig. 6 shows the shape of the 2 nd magnetic steel sheet 72, and shows the connection portion of the 2 nd magnetic steel sheet 72 in an enlarged manner. Fig. 7 shows the connection portions of the 2 nd and 4 th

electromagnetic steel plates

72 and 74 among the layers L1 to L4. The number of stacked layers of the 2 nd magnetic steel sheet 72 and the 4 th magnetic steel sheet 74 is the same as the number of stacked layers of the 1 st magnetic steel sheet 71 and the 3 rd magnetic steel sheet 73.

The 3 rd electromagnetic steel sheet 73 has: a portion 3A overlapping the 1 st electromagnetic steel sheet 71; and a portion 3B provided with a projection 81 and projecting more outward than the 1 st electromagnetic steel sheet 71. When the coupled core 60A and the coupled core 60B are coupled, the distal end 3C of the 3 rd magnetic steel sheet 73 that protrudes outward from the 1 st magnetic steel sheet 71 is adjacent to the 2 nd magnetic steel sheet 72.

The projection 81 of the 3 rd electromagnetic steel plate 73 has elasticity. The projection 81 extends obliquely in a direction approaching the 1 st electromagnetic steel sheet 71. The projection 81 may be formed by any method, but in the present embodiment, it is formed by cutting and raising a part of the 3 rd electromagnetic steel sheet 73. The projection 81 may have any shape, but in the present embodiment, it has a rectangular shape in a plan view.

The 4 th electromagnetic steel sheet 74 includes: a portion 4A overlapping the 2 nd electromagnetic steel sheet 72; and a portion 4B provided with the hole 82 and protruding further to the outside than the 2 nd electromagnetic steel sheet 72. When the coupled core 60A and the coupled core 60B are coupled, the tip 4C of the 4 th magnetic steel sheet 74 that protrudes outward from the 2 nd magnetic steel sheet 72 is adjacent to the 1 st magnetic steel sheet 71.

The hole 82 of the 4 th electromagnetic steel sheet 74 may have any shape, but in the present embodiment, it has a rectangular shape in a plan view. When the connection core 60A and the connection core 60B are connected, the projection 81 of the 3 rd electromagnetic steel plate 73 is fitted into the hole 82. Thereby, the coupled core 60A and the coupled core 60B are coupled via the same number of projections 81 as the number of the 3 rd magnetic steel sheets 73 at least in the direction in which the projections 81 project. Therefore, the larger the number of the protrusions 81 is, the stronger the coupling force between the coupling core 60A and the coupling core 60B becomes.

Description of the procedure

Steps for realizing the structure of the stator core 43 will be described with reference to fig. 8, 9, 10, and 11. Specifically, a procedure of coupling the coupling core 60A and the coupling core 60B will be described. This step corresponds to a part of the process of the method for manufacturing the stator core 43 according to the present embodiment.

First, as shown in fig. 8, the connection core 60A having the protrusion 81 is moved in the circumferential direction toward the connection core 60B having the hole 82 so that the 4 th magnetic steel sheet 74 and the 1 st magnetic steel sheet 71 are in the same layer, and the 2 nd magnetic steel sheet 72 and the 3 rd magnetic steel sheet 73 are in the same layer.

As shown in fig. 9, the 3 rd electromagnetic steel sheet 73 of the layer L2 is inserted into the gap created below the 4 th electromagnetic steel sheet 74 of the layer L1 located one layer above. During the insertion of the 3 rd magnetic steel sheet 73 of the layer L2, the projection 81 of the 3 rd magnetic steel sheet 73 of the layer L2 is elastically deformed by a force applied to the opposite side of the side where the projection 81 in the axial direction projects due to the circumferential end of the 4 th magnetic steel sheet 74 of the layer L1. Specifically, as the 3 rd magnetic steel sheet 73 of the layer L2 is inserted, the projection 81 is gradually crushed by the circumferential end of the 4 th magnetic steel sheet 74 of the layer L1 contacting the inclined surface of the projection 81. The circumferential end of the 4 th electromagnetic steel sheet 74 corresponds to the end 4C of the 4 th electromagnetic steel sheet 74 of the layer L1 shown in fig. 7.

The 3 rd magnetic steel sheet 73 of the layer L4 is also inserted into the gap created below the 4 th magnetic steel sheet 74 of the layer L3 located one above, similarly to the 3 rd magnetic steel sheet 73 of the layer L2.

As described above, in the present embodiment, the projections 81 of the 3 rd electrical steel sheet 73 are elastically deformed, and therefore, the 3 rd electrical steel sheet 73 can be easily inserted as compared with other methods such as press fitting.

As shown in fig. 10, when the protrusion 81 of the 3 rd magnetic steel sheet 73 of the layer L2 reaches the hole 82 of the 4 th magnetic steel sheet 74 of the layer L1, it returns to its original shape by the elastic force and fits into the hole 82. Thereby, the 3 rd electromagnetic steel sheet 73 of the layer L2 is joined to the 4 th electromagnetic steel sheet 74 of the layer L1. The 3 rd magnetic steel sheet 73 of the layer L4 and the 4 th magnetic steel sheet 74 of the layer L3 are also joined to the 3 rd magnetic steel sheet 73 of the layer L2 and the 4 th magnetic steel sheet 74 of the layer L1 in the same manner.

As shown in fig. 11, even if the connection core 60A is pulled in the circumferential direction toward the opposite side of the connection core 60B, since the protrusion 81 of the connection core 60A is fitted into the hole 82 of the connection core 60B, the contact force between the protrusion 81 and the inner wall of the hole 82 acts, and the connection core 60A is not pulled away from the connection core 60B.

As described above, the coupling core 60A does not move even when pulled to the opposite side of the coupling core 60B, but can move when the coupling core 60A is pressed against the coupling core 60B. Although a force that contracts the stator core 43 in the circumferential direction acts when the stator core 43 is thermally mounted in the sealed container 20 of the compressor 12, in the present embodiment, the force can be absorbed by the coupling core 60A moving toward the coupling core 60B. Therefore, the inner diameter roundness of the stator core 43 can be easily improved. Further, since stress is not concentrated on the connection portion when the stator core 43 is hot-fitted, it is possible to avoid generation of iron loss at the connection portion.

Description of effects of embodiments

In the present embodiment, a combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73 having the projection 81, and the 4 th magnetic steel sheet 74 having the hole 82 into which the projection 81 of the 3 rd magnetic steel sheet 73 is fitted is laminated in the same orientation. Since the protrusions 81 of any combination protrude in the same direction, the coupling core 60A and the coupling core 60B are coupled to each other via 2 or more protrusions 81 at least in this direction. Therefore, the coupling force between the coupling core 60A and the coupling core 60B is strong. Here, the coupling core 60A and the coupling core 60B correspond to divided portions of the stator core 43.

In the present embodiment, the hole 82 of the 4 th electromagnetic steel sheet 74 is provided in a layer different from the layer provided with the projection 81 of the 3 rd electromagnetic steel sheet 73. Therefore, the connection core 60A and the connection core 60B can be connected easily at low cost without welding.

In the technique described in patent document 1, gaps are generated which greatly extend in the stacking direction in the upper and lower portions of the convex portions formed in the divided boundary portions and in the concave portions themselves formed in the divided boundary portions. Such a gap is an important factor to reduce the magnetic path of the stator and to reduce the motor efficiency. In contrast, in the present embodiment, the 1 st magnetic steel sheet 71 and the 3 rd magnetic steel sheet 73 protruding outward from the 1 st magnetic steel sheet 71 are alternately stacked one by one, and therefore, a gap generated in the stacking direction is small. The same applies to the 2 nd electromagnetic steel sheet 72 and the 4 th electromagnetic steel sheet 74. Therefore, the magnetic path of the stator 41 is not reduced, and as a result, the motor efficiency can be maintained.

Other constructions

Instead of being integrally formed, each tooth 61 may have a structure in which a portion extending with a constant width is connected to the tip in the radial direction. As a connection method, a method of connecting the connection core 60A and the connection core 60B may be used. That is, a method of fitting the projection 81 of one electromagnetic steel plate into the hole 82 of the other electromagnetic steel plate can be used.

In the present embodiment, the combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74 is stacked continuously in the same orientation, but another combination of magnetic steel sheets may be disposed between the combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74. Hereinafter, a difference from the present embodiment will be mainly described with respect to one of such examples.

The structure of the stator core 43 according to the modification of the present embodiment will be described with reference to fig. 12.

In this modification, a combination of the 5 th magnetic steel sheet 75 and the 6 th magnetic steel sheet 76 is disposed between combinations of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74.

The coupled core 60A is a divided core 60 having a structure in which a 1 st magnetic steel sheet 71, a 3 rd magnetic steel sheet 73, and a 5 th magnetic steel sheet 75 are stacked in the axial direction. Specifically, the coupling core 60A has a structure in which 1 st 1 electrical steel sheet 71, 1 st 3 electrical steel sheet 73, and 2 nd 5 electrical steel sheets 75 are sequentially and repeatedly arranged in the axial direction. Fig. 12 shows a connection portion between the 1 st magnetic steel sheet 71, the 3 rd magnetic steel sheet 73, and the 5 th magnetic steel sheet 75 in any 6 continuous layers L1 to L6. The number of stacked layers of the 1 st magnetic steel sheet 71, the 3 rd magnetic steel sheet 73, and the 5 th magnetic steel sheet 75 is preferably more than 6, but here, for convenience of explanation, only 6 layers L1 to L6 are shown.

The coupled core 60B is a divided core 60 having a structure in which a 2 nd magnetic steel sheet 72, a 4 th magnetic steel sheet 74, and a 6 th magnetic steel sheet 76 are stacked in the axial direction. Specifically, the coupled core 60B has a structure in which 1-th 4 th magnetic steel sheet 74, 1-th 2 nd magnetic steel sheet 72, and 2-th 6 th magnetic steel sheet 76 are arranged in the axial direction in this order. Fig. 12 shows the connection portions of the 2 nd, 4 th, and 6 th

electromagnetic steel sheets

72, 74, and 76 among the layers L1 to L6. The number of stacked layers of the 2 nd magnetic steel sheet 72, the 4 th magnetic steel sheet 74, and the 6 th magnetic steel sheet 76 is the same as the number of stacked layers of the 1 st magnetic steel sheet 71, the 3 rd magnetic steel sheet 73, and the 5 th magnetic steel sheet 75.

When the coupled core 60A and the coupled core 60B are coupled, the 6 th electromagnetic steel plate 76 and the 5 th electromagnetic steel plate 75 are adjacent to each other.

In this modification, the number of gaps generated in the stacking direction by the coupling portion can be reduced. In addition, there is a layer having neither protrusions 81 nor holes 82. Therefore, the magnetic path of the stator 41 can be increased, and as a result, the motor efficiency can be improved.

Embodiment 2.

The present embodiment will be described mainly with respect to differences from embodiment 1.

The structure of the stator core 43 according to the present embodiment will be described with reference to fig. 13 and 14.

In embodiment 1, both the projection 81 of the 3 rd magnetic steel sheet 73 and the hole 82 of the 4 th magnetic steel sheet 74 are formed in a rectangular shape in a plan view. In contrast, in the present embodiment, the projection 81 of the 3 rd magnetic steel sheet 73 is formed in a square shape in a plan view, and the hole 82 of the 4 th magnetic steel sheet 74 is formed in a circular shape in a plan view. The projection 81 preferably has a length of one side which is the radius R of the hole 82

Not more than twice, in the present embodiment, the side length is the radius R of the hole 82

Double instant

When the coupled core 60A and the coupled core 60B are coupled, the 3 rd magnetic steel sheet 73 of the layer L2 is inserted into the gap generated below the 4 th magnetic steel sheet 74 of the layer L1 located one above, as in embodiment 1. During the insertion of the 3 rd magnetic steel sheet 73 of the layer L2, the projection 81 of the 3 rd magnetic steel sheet 73 of the layer L2 is elastically deformed by a force applied to the opposite side of the side where the projection 81 in the axial direction projects due to the circumferential end of the 4 th magnetic steel sheet 74 of the layer L1. The 3 rd magnetic steel sheet 73 of the layer L4 is also inserted into the gap created below the 4 th magnetic steel sheet 74 of the layer L3 located one above, similarly to the 3 rd magnetic steel sheet 73 of the layer L2.

When the protrusion 81 of the 3 rd magnetic steel sheet 73 of the layer L2 reaches the hole 82 of the 4 th magnetic steel sheet 74 of the layer L1, it returns to its original shape by the elastic force and fits into the hole 82. Thereby, the 3 rd electromagnetic steel sheet 73 of the layer L2 is joined to the 4 th electromagnetic steel sheet 74 of the layer L1. The 3 rd magnetic steel sheet 73 of the layer L4 and the 4 th magnetic steel sheet 74 of the layer L3 are also joined to the 3 rd magnetic steel sheet 73 of the layer L2 and the 4 th magnetic steel sheet 74 of the layer L1 in the same manner.

As shown in fig. 14, in the present embodiment, even if the projection 81 moves obliquely with respect to the circumferential direction, it is easily fitted into the hole 82. Therefore, the tolerance for the deviation in the insertion direction of the 3 rd electromagnetic steel sheet 73 is improved. That is, the degree of freedom in the insertion direction of the 3 rd electromagnetic steel plate 73 is improved.

In the present embodiment, the combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74 is stacked continuously in the same orientation, but another combination of magnetic steel sheets may be disposed between the combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74. Specifically, as in the modification of embodiment 1, a combination of the 5 th magnetic steel sheet 75 and the 6 th magnetic steel sheet 76 shown in fig. 12 may be arranged among combinations of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74.

Embodiment 3.

The structure of the stator core 43 according to the present embodiment will be described with reference to fig. 15.

In embodiment 1, the projection 81 of the 3 rd magnetic steel sheet 73 is provided only at 1 position of the 3 rd magnetic steel sheet 73, and the hole 82 of the 4 th magnetic steel sheet 74 is also provided only at 1 position of the 4 th magnetic steel sheet 74. In contrast, in the present embodiment, the projections 81 of the 3 rd magnetic steel sheet 73 are provided at a plurality of locations of the 3 rd magnetic steel sheet 73, and the holes 82 of the 4 th magnetic steel sheet 74 are also provided at a plurality of locations of the 4 th magnetic steel sheet 74. Specifically, the projection 81 is provided at 2 positions of the 3 rd electromagnetic steel plate 73, and the hole 82 is also provided at 2 positions of the 4 th electromagnetic steel plate 74.

When the coupled core 60A and the coupled core 60B are coupled, the 3 rd magnetic steel sheet 73 of the layer L2 is inserted into the gap generated below the 4 th magnetic steel sheet 74 of the layer L1 located one above, as in embodiment 1. During the insertion of the 3 rd magnetic steel sheet 73 of the layer L2, the 2 projections 81 of the 3 rd magnetic steel sheet 73 of the layer L2 are forced by the circumferential end of the 4 th magnetic steel sheet 74 of the layer L1 on the opposite side of the side where the respective projections 81 project in the axial direction, and elastically deform. The 3 rd magnetic steel sheet 73 of the layer L4 is also inserted into the gap created below the 4 th magnetic steel sheet 74 of the layer L3 located one above, similarly to the 3 rd magnetic steel sheet 73 of the layer L2.

If the 2 projections 81 of the 3 rd magnetic steel sheet 73 of the layer L2 reach the corresponding holes 82 of the 4 th magnetic steel sheet 74 of the layer L1, the projections are restored to their original shapes by the elastic force and are fitted into the corresponding holes 82. Thereby, the 3 rd electromagnetic steel sheet 73 of the layer L2 is joined to the 4 th electromagnetic steel sheet 74 of the layer L1. The 3 rd magnetic steel sheet 73 of the layer L4 and the 4 th magnetic steel sheet 74 of the layer L3 are also joined to the 3 rd magnetic steel sheet 73 of the layer L2 and the 4 th magnetic steel sheet 74 of the layer L1 in the same manner.

In the present embodiment, since the protrusions 81 of each layer are provided at a plurality of locations, the coupling force between the coupling core 60A and the coupling core 60B is improved.

In the present embodiment, the combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74 is stacked continuously in the same orientation, but another combination of magnetic steel sheets may be disposed between the combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74. Specifically, similarly to the modification of embodiment 1, a combination of the 5 th magnetic steel sheet 75 and the 6 th magnetic steel sheet 76 shown in fig. 12 may be arranged among combinations of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74.

Embodiment 4.

Hereinafter, the structure of the stator core 43 according to the present embodiment, steps for realizing the structure, and effects obtained by the structure will be described in order.

Description of the construction

The structure of the stator core 43 will be described with reference to fig. 16.

The stator core 43 has a structure in which a plurality of divided cores 60 are connected in the circumferential direction, as in embodiment 1. The number of the divided cores 60 may be any number, but in the present embodiment, it is also 9.

Each of the divided cores 60 has a structure in which the teeth 61 and the back yoke 62 are connected in the radial direction, unlike embodiment 1. The adjacent divided cores 60 are coupled to each other by the back yoke 62. As a method of connecting the divided cores 60 to each other, the same method as that of embodiment 1 or any other method can be used.

In each of the divided cores 60, the teeth 61 are coupled to the inside of the back yoke 62 in the radial direction. The teeth 61 are formed in a shape extending radially inward from the root with a constant width and having a wider tip width, as in embodiment 1. The winding 44 is wound around a portion of the tooth 61 extending with a constant width.

As described above, in the present embodiment, the stator core 43 has a structure in which 9 teeth 61 and 9 back yokes 62 are coupled in the radial direction. The stator core 43 may have an integral structure in the circumferential direction. That is, the stator core 43 may have a structure in which 9 teeth 61 formed separately are coupled to one back yoke 62 formed integrally. The number of teeth 61 can be changed as appropriate in the same manner as the number of the divided cores 60.

Magnetic flux generated by current during driving of the motor 40, which is a compressor motor, generates hysteresis loss and eddy current loss in the stator core 43. The hysteresis loss and the eddy current loss are important factors that reduce the motor efficiency as the iron loss. As a method for reducing the iron loss, there is a method of using an electrical steel sheet having low iron loss such as a grain-oriented electrical steel sheet. However, an electrical steel sheet having a low iron loss is expensive, and becomes an important factor for increasing the cost. Therefore, in the present embodiment, each of the divided cores 60 is divided into the teeth 61 and the back yoke 62, and an electromagnetic steel sheet having a low iron loss is selectively used for the teeth 61 having a high magnetic flux density. The teeth 61 and the back yoke 62 formed of different electromagnetic steel plates need to be coupled with a strong coupling force so as not to cause a problem of acoustic vibration generated at the coupling portion.

The structure of the magnetic steel sheet forming the teeth 61 and the back yoke 62 will be described with reference to fig. 17, 18, 19, and 20.

Each tooth 61 is a segment having a structure in which the 1 st magnetic steel sheet 71 and the 3 rd magnetic steel sheet 73 are stacked in the axial direction. Each tooth 61 may have a structure in which only the 1 st magnetic steel sheet 71 and the 3 rd magnetic steel sheet 73 are stacked, but in the present embodiment, the 1 st magnetic steel sheet 71, the 3 rd magnetic steel sheet 73, the 6 th magnetic steel sheet 76, and the 8 th magnetic steel sheet 78 are stacked. Specifically, each tooth 61 is configured such that 1 st magnetic steel sheet 71, 1 rd 3 magnetic steel sheet 73, 1 st 8 magnetic steel sheet 78, and 1 st 6 magnetic steel sheet 76 are arranged in the axial direction in this order. Fig. 17 shows the shape of the 1 st magnetic steel sheet 71, and shows the connection portion of the 1 st magnetic steel sheet 71 in an enlarged manner. Fig. 18 shows the shape of the 3 rd magnetic steel plate 73, and shows the connection portion of the 3 rd magnetic steel plate 73 in an enlarged manner. Fig. 19 shows a connection portion of the 1 st magnetic steel sheet 71, the 3 rd magnetic steel sheet 73, the 6 th magnetic steel sheet 76, and the 8 th magnetic steel sheet 78 among arbitrary 4 continuous layers L1 to L4. The number of stacked layers of the 1 st magnetic steel sheet 71, the 3 rd magnetic steel sheet 73, the 6 th magnetic steel sheet 76, and the 8 th magnetic steel sheet 78 is preferably more than 4, but here, for convenience of explanation, only 4 layers L1 to L4 are shown. Fig. 20 shows 6 layers L1 to L6 including layers L1 to L4.

Each back yoke 62 is a segment having a structure in which a 2 nd electromagnetic steel plate 72 and a 4 th electromagnetic steel plate 74 are stacked in the axial direction. Each back yoke 62 may have a structure in which only the 2 nd magnetic steel sheet 72 and the 4 th magnetic steel sheet 74 are laminated, but in the present embodiment, the 2 nd magnetic steel sheet 72, the 4 th magnetic steel sheet 74, the 5 th magnetic steel sheet 75, and the 7 th magnetic steel sheet 77 are laminated. Specifically, each back yoke 62 is configured such that 1-th 4 magnetic steel sheet 74, 1-th 2 magnetic steel sheet 72, 1-th 5 magnetic steel sheet 75, and 1-th 7 magnetic steel sheet 77 are sequentially and repeatedly arranged in the axial direction. Fig. 17 shows the shape of the 4 th electromagnetic steel plate 74, and shows the connection portion of the 4 th electromagnetic steel plate 74 in an enlarged manner. Fig. 18 shows the shape of the 2 nd magnetic steel sheet 72, and shows the connection portion of the 2 nd magnetic steel sheet 72 in an enlarged manner. Fig. 19 shows the connection portions of the 2 nd, 4 th, 5 th, and 7 th

electromagnetic steel plates

72, 74, 75, and 77 among the layers L1 to L4. The number of stacked layers of the 2 nd magnetic steel sheet 72 and the 4 th magnetic steel sheet 74 is the same as the number of stacked layers of the 2 nd magnetic steel sheet 72, the 4 th magnetic steel sheet 74, the 5 th magnetic steel sheet 75, and the 7 th magnetic steel sheet 77.

The 1 st magnetic steel sheet 71 is a magnetic steel sheet having a lower iron loss than the 2 nd magnetic steel sheet 72, the 4 th magnetic steel sheet 74, the 5 th magnetic steel sheet 75, and the 7 th magnetic steel sheet 77.

The 3 rd magnetic steel sheet 73 and the 1 st magnetic steel sheet 71 are magnetic steel sheets having iron losses lower than those of the 2 nd magnetic steel sheet 72, the 4 th magnetic steel sheet 74, the 5 th magnetic steel sheet 75, and the 7 th magnetic steel sheet 77, respectively. The 3 rd electromagnetic steel sheet 73 has: a portion 3A overlapping the 1 st electromagnetic steel sheet 71; and a portion 3B provided with a projection 81 and projecting more outward than the 1 st electromagnetic steel sheet 71. When each tooth 61 is coupled to the corresponding back yoke 62, the distal end 3C of the 3 rd magnetic steel sheet 73 that protrudes outward from the 1 st magnetic steel sheet 71 is adjacent to the 2 nd magnetic steel sheet 72.

The projection 81 of the 3 rd electromagnetic steel plate 73 is the same as that of embodiment 1.

The 4 th electromagnetic steel sheet 74 includes: a portion 4A overlapping the 2 nd electromagnetic steel sheet 72; and a portion 4B provided with the hole 82 and protruding further to the outside than the 2 nd electromagnetic steel sheet 72. When each tooth 61 is coupled to the corresponding back yoke 62, the leading end 4C of the 4 th electromagnetic steel plate 74 that protrudes outward from the 2 nd electromagnetic steel plate 72 is adjacent to the 1 st electromagnetic steel plate 71.

The hole 82 of the 4 th electromagnetic steel sheet 74 is the same as that in embodiment 1. When each tooth 61 is coupled to the corresponding back yoke 62, the projection 81 of the 3 rd electromagnetic steel plate 73 is fitted into the hole 82. Thus, each tooth 61 is coupled to the corresponding back yoke 62 via the same number of projections 81 as the number of 3 rd electromagnetic steel plates 73 at least in the direction in which the projections 81 project. Therefore, the larger the number of the projections 81, the stronger the coupling force between the teeth 61 and the back yoke 62.

The 5 th electromagnetic steel plate 75 is a part of each back yoke 62. Thus, when each tooth 61 is coupled to the corresponding back yoke 62, the 5 th magnetic steel sheet 75 is disposed on the side where the 1 st magnetic steel sheet 71 is located and the 2 nd magnetic steel sheet 72 is located, among the sides where the 2 nd magnetic steel sheet 72 is located.

The 6 th electromagnetic steel sheet 76 is an electromagnetic steel sheet having a lower iron loss than the 2 nd electromagnetic steel sheet 72, the 4 th electromagnetic steel sheet 74, the 5 th electromagnetic steel sheet 75, and the 7 th electromagnetic steel sheet 77, similarly to the 1 st electromagnetic steel sheet 71. The 6 th electromagnetic steel sheet 76 is a part of each tooth 61. Thus, when each tooth 61 is coupled to the corresponding back yoke 62, the 6 th magnetic steel sheet 76 is disposed on the side where the 1 st magnetic steel sheet 71 is located, of the side where the 2 nd magnetic steel sheet 72 is located, on the side where the 1 st magnetic steel sheet 71 is located.

The 7 th electromagnetic steel sheet 77 includes: a portion 7A overlapping the 5 th electromagnetic steel sheet 75; and a portion 7B provided with a projection 81 and projecting more outward than the 5 th electromagnetic steel sheet 75. When each tooth 61 is coupled to the corresponding back yoke 62, the leading end 7C of the 7 th electromagnetic steel plate 77 that protrudes outward from the 5 th electromagnetic steel plate 75 is adjacent to the 6 th electromagnetic steel plate 76.

The projection 83 of the 7 th electromagnetic steel plate 77 has elasticity. The projection 83 extends obliquely in a direction approaching the 5 th electromagnetic steel sheet 75. The projection 83 may be formed by any method, but in the present embodiment, it is formed by cutting and raising a part of the 7 th electromagnetic steel sheet 77. The projection 83 may have any shape, but in the present embodiment, it is formed in a rectangular shape in a plan view. When each tooth 61 is coupled to the corresponding back yoke 62, the projection 83 projects toward the same side as the side from which the projection 81 of the 3 rd electromagnetic steel sheet 73 projects in the stacking direction.

The 8 th electromagnetic steel sheet 78 includes: a portion 8A overlapping with the 6 th electromagnetic steel sheet 76; and a portion 8B provided with a hole 84 and protruding further to the outside than the 6 th electromagnetic steel sheet 76. When each tooth 61 is coupled to the corresponding back yoke 62, the tip 8C of the 8 th electromagnetic steel plate 78 protruding outward from the 6 th electromagnetic steel plate 76 is adjacent to the 5 th electromagnetic steel plate 75.

The hole 84 of the 8 th electromagnetic steel sheet 78 may have any shape, but in the present embodiment, it is formed in a rectangular shape in plan view. When each tooth 61 is coupled to the corresponding back yoke 62, the projection 83 of the 7 th electromagnetic steel plate 77 is fitted into the hole 84. Thus, each tooth 61 is coupled to the corresponding back yoke 62 via the same number of projections 83 as the number of 7 th electromagnetic steel plates 77 in the direction in which the projections 83 project. Therefore, the larger the number of the projections 83, the stronger the coupling force between each tooth 61 and the corresponding back yoke 62.

Description of the procedure

The steps for realizing the structure of the stator core 43 will be described with reference to fig. 20. Specifically, a procedure of coupling one tooth 61 to one back yoke 62 will be described. This step corresponds to a part of the process of the method for manufacturing the stator core 43 according to the present embodiment.

First, the tooth 61 having the protrusion 81 and the hole 84 is moved in the radial direction toward the back yoke 62 having the hole 82 and the protrusion 83 so that the 4 th magnetic steel sheet 74 and the 1 st magnetic steel sheet 71 are in the same layer, the 2 nd magnetic steel sheet 72 and the 3 rd magnetic steel sheet 73 are in the same layer, the 5 th magnetic steel sheet 75 and the 8 th magnetic steel sheet 78 are in the same layer, and the 7 th magnetic steel sheet 77 and the 6 th magnetic steel sheet 76 are in the same layer.

The 3 rd electromagnetic steel plate 73 of the layer L2 is inserted into the gap created below the 4 th electromagnetic steel plate 74 of the layer L1 located one layer above. During the insertion of the 3 rd magnetic steel sheet 73 of the layer L2, the projection 81 of the 3 rd magnetic steel sheet 73 of the layer L2 is elastically deformed by a force applied to the opposite side of the side where the projection 81 in the axial direction projects due to the radial direction end of the 4 th magnetic steel sheet 74 of the layer L1. Specifically, as the 3 rd magnetic steel sheet 73 of the layer L2 is inserted, the projection 81 is gradually crushed by the radial end of the 4 th magnetic steel sheet 74 of the layer L1 contacting the inclined surface of the projection 81. The radial end of the 4 th electromagnetic steel sheet 74 corresponds to the end 4C of the 4 th electromagnetic steel sheet 74 of the layer L1 shown in fig. 19.

The 3 rd magnetic steel sheet 73 of the layer L6 is also inserted into the gap created below the 4 th magnetic steel sheet 74 of the layer L5 located one above, similarly to the 3 rd magnetic steel sheet 73 of the layer L2.

The 7 th electromagnetic steel plate 77 of the layer L4 is inserted into the gap created below the 8 th electromagnetic steel plate 78 of the layer L3 located one layer above. During the insertion of the 7 th electromagnetic steel sheet 77 of the layer L4, the projection 83 of the 7 th electromagnetic steel sheet 77 of the layer L4 is forced by the radial end of the 8 th electromagnetic steel sheet 78 of the layer L3 on the side opposite to the side on which the projection 83 protrudes in the axial direction, and is elastically deformed. Specifically, as the 7 th electromagnetic steel sheet 77 of the layer L4 is inserted, the protrusion 83 is gradually crushed by the radial end of the 8 th electromagnetic steel sheet 78 of the layer L3 that is in contact with the inclined surface of the protrusion 83. The radial end of the 8 th electromagnetic steel sheet 78 corresponds to the end 8C of the 8 th electromagnetic steel sheet 78 of the layer L3 shown in fig. 19.

As described above, in the present embodiment, since both the projections 81 of the 3 rd magnetic steel sheet 73 and the projections 83 of the 7 th magnetic steel sheet 77 are elastically deformed, the 3 rd magnetic steel sheet 73 and the 7 th magnetic steel sheet 77 can be easily inserted as compared with other methods such as press fitting.

When the protrusion 81 of the 3 rd magnetic steel sheet 73 of the layer L2 reaches the hole 82 of the 4 th magnetic steel sheet 74 of the layer L1, it returns to its original shape by the elastic force and fits into the hole 82. Thereby, the 3 rd electromagnetic steel sheet 73 of the layer L2 is joined to the 4 th electromagnetic steel sheet 74 of the layer L1. The 3 rd magnetic steel sheet 73 of the layer L6 and the 4 th magnetic steel sheet 74 of the layer L5 are also joined to the 3 rd magnetic steel sheet 73 of the layer L2 and the 4 th magnetic steel sheet 74 of the layer L1 in the same manner.

When the protrusion 83 of the 7 th magnetic steel sheet 77 of the layer L4 reaches the hole 84 of the 8 th magnetic steel sheet 78 of the layer L3, the protrusion returns to its original shape by the elastic force and fits into the hole 84. Thereby, the 7 th electromagnetic steel sheet 77 of the layer L4 and the 8 th electromagnetic steel sheet 78 of the layer L3 are also joined.

Even if the teeth 61 are pulled in the radial direction toward the opposite side of the back yoke 62, the protrusions 81 of the teeth 61 are fitted into the holes 82 of the back yoke 62, so that the contact force between the protrusions 81 and the inner wall of the holes 82 acts, and the teeth 61 are not pulled away from the back yoke 62. Similarly, even if the back yoke 62 is pulled in the radial direction toward the opposite side of the teeth 61, the protrusions 83 of the back yoke 62 are fitted into the holes 84 of the teeth 61, so that the contact force between the protrusions 83 and the inner walls of the holes 84 acts, and the back yoke 62 is not pulled away from the teeth 61.

Description of effects of embodiments

In the present embodiment, a combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73 having the projection 81, and the 4 th magnetic steel sheet 74 having the hole 82 into which the projection 81 of the 3 rd magnetic steel sheet 73 is fitted is laminated in the same orientation. In the present embodiment, a combination of the 5 th magnetic steel sheet 75, the 6 th magnetic steel sheet 76, the 7 th magnetic steel sheet 77 having the projections 83, and the 8 th magnetic steel sheet 78 having the holes 84 into which the projections 83 of the 7 th magnetic steel sheet 77 are fitted is also arranged among combinations of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74. The projection 83 of the 7 th electromagnetic steel plate 77 projects in a direction different from the projection 81 of the 3 rd electromagnetic steel plate 73, and therefore, the tooth 61 and the back yoke 62 are coupled in 2 or more directions by the two kinds of

projections

81, 83. Thus, the teeth 61 and the back yoke 62 are firmly fixed. Here, the teeth 61 and the back yoke 62 correspond to divided portions of the stator core 43.

Other constructions

The electromagnetic steel sheet forming the back yoke 62 may be an electromagnetic steel sheet having low iron loss, as well as the electromagnetic steel sheet forming the teeth 61. That is, the 2 nd and 4 th

electromagnetic steel plates

72 and 74 may be electromagnetic steel plates with low iron loss, like the 1 st and 3 rd

electromagnetic steel plates

71 and 73.

Other combinations of magnetic steel sheets may be arranged between the combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74 and the combination of the 5 th magnetic steel sheet 75, the 6 th magnetic steel sheet 76, the 7 th magnetic steel sheet 77, and the 8 th magnetic steel sheet 78. Specifically, similarly to the modification of embodiment 1, a combination of the 5 th magnetic steel sheet 75 and the 6 th magnetic steel sheet 76 shown in fig. 12 may be disposed between a combination of the 1 st magnetic steel sheet 71, the 2 nd magnetic steel sheet 72, the 3 rd magnetic steel sheet 73, and the 4 th magnetic steel sheet 74 and a combination of the 5 th magnetic steel sheet 75, the 6 th magnetic steel sheet 76, the 7 th magnetic steel sheet 77, and the 8 th magnetic steel sheet 78.

Embodiment 5.

The present embodiment will be described mainly with respect to differences from embodiment 4.

The structure of the stator core 43 according to the present embodiment will be described with reference to fig. 21 and 22.

In embodiment 4, the projection 83 of the 7 th electromagnetic steel sheet 77 projects toward the same side as the side from which the projection 81 of the 3 rd electromagnetic steel sheet 73 projects in the stacking direction. In contrast, in the present embodiment, the projection 83 of the 7 th electromagnetic steel sheet 77 projects in the stacking direction toward the side opposite to the side where the projection 81 of the 3 rd electromagnetic steel sheet 73 projects. In the stacking direction, the positional relationship between the 5 th magnetic steel sheet 75 and the 7 th magnetic steel sheet 77 and the positional relationship between the 6 th magnetic steel sheet 76 and the 8 th magnetic steel sheet 78 are reverse to those in embodiment 4.

When one tooth 61 is coupled to one back yoke 62, the 3 rd electromagnetic steel plate 73 of the layer L2 is inserted into a gap generated below the 4 th electromagnetic steel plate 74 of the layer L1 located one above, as in embodiment 4. During the insertion of the 3 rd magnetic steel sheet 73 of the layer L2, the projection 81 of the 3 rd magnetic steel sheet 73 of the layer L2 is elastically deformed by a force applied to the opposite side of the side where the projection 81 in the axial direction projects due to the radial direction end of the 4 th magnetic steel sheet 74 of the layer L1. The 3 rd magnetic steel sheet 73 of the layer L6 is also inserted into the gap formed below the 4 th magnetic steel sheet 74 of the layer L5 located one above, similarly to the 3 rd magnetic steel sheet 73 of the layer L2.

Unlike embodiment 4, the 7 th electromagnetic steel sheet 77 of the layer L3 is inserted into the gap created above the 8 th electromagnetic steel sheet 78 of the layer L4 that is one layer below. During the insertion of the 7 th electromagnetic steel sheet 77 of the layer L3, the projection 83 of the 7 th electromagnetic steel sheet 77 of the layer L3 is forced by the radial end of the 8 th electromagnetic steel sheet 78 of the layer L4 on the side opposite to the side on which the projection 83 protrudes in the axial direction, and is elastically deformed. Specifically, as the 7 th electromagnetic steel sheet 77 of the layer L3 is inserted, the protrusion 83 is gradually crushed by the radial end of the 8 th electromagnetic steel sheet 78 of the layer L4 that is in contact with the inclined surface of the protrusion 83. The radial end of the 8 th electromagnetic steel sheet 78 corresponds to the end 8C of the 8 th electromagnetic steel sheet 78 of the layer L4 shown in fig. 21.

When the protrusion 83 of the 7 th magnetic steel sheet 77 of the layer L3 reaches the hole 84 of the 8 th magnetic steel sheet 78 of the layer L4, the protrusion returns to its original shape by the elastic force and fits into the hole 84. Thereby, the 7 th electromagnetic steel sheet 77 of the layer L3 and the 8 th electromagnetic steel sheet 78 of the layer L4 are also joined.

As shown in fig. 22, in the present embodiment, the projections 81 of the teeth 61 and the projections 83 of the back yoke 62 project in directions shifted by 180 degrees. Therefore, when the teeth 61 and the back yoke 62 are coupled, the projections 81 of the teeth 61 and the projections 83 of the back yoke 62 are less likely to interfere with each other.

While the embodiments of the present invention have been described above, several of the embodiments may be combined and implemented. Alternatively, any one or several of these embodiments may also be partially implemented. Specifically, only one of the components described as the "section" in the description of the embodiments may be used, or any combination of some of the components may be used. The present invention is not limited to these embodiments, and various modifications can be made as necessary.

Claims

1. A stator core is characterized by comprising:

a 1 st electromagnetic steel sheet;

a 2 nd electromagnetic steel sheet;

a 3 rd electromagnetic steel sheet having: a portion overlapping with the 1 st electromagnetic steel sheet; and a portion protruding outward from the 1 st magnetic steel sheet, wherein a projection is formed by cutting and raising a portion of a magnetic steel sheet, has elasticity, and extends obliquely in a direction approaching the 1 st magnetic steel sheet, and a tip of the 3 rd magnetic steel sheet protruding outward from the 1 st magnetic steel sheet is adjacent to the 2 nd magnetic steel sheet; and

a 4 th electromagnetic steel sheet having: a portion overlapping with the 2 nd electromagnetic steel sheet; and a portion protruding outward from the 2 nd magnetic steel sheet, a hole into which the projection of the 3 rd magnetic steel sheet is fitted being provided in the portion, and a tip of the 4 th magnetic steel sheet protruding outward from the 2 nd magnetic steel sheet is adjacent to the 1 st magnetic steel sheet,

a combination of the 1 st magnetic steel sheet, the 2 nd magnetic steel sheet, the 3 rd magnetic steel sheet, and the 4 th magnetic steel sheet is continuously laminated in the same orientation.

2. A stator core according to claim 1,

has a structure in which a plurality of divided cores are connected in the circumferential direction,

one of 2 of the plurality of split cores adjacent in the circumferential direction includes the 1 st magnetic steel sheet and the 3 rd magnetic steel sheet, and the other includes the 2 nd magnetic steel sheet and the 4 th magnetic steel sheet, and combinations of the 1 st magnetic steel sheet, the 2 nd magnetic steel sheet, the 3 rd magnetic steel sheet, and the 4 th magnetic steel sheet are continuously stacked in the same orientation from one end to the other end in the axial direction of the 2 split cores,

the stator core is used by being fixed to the inside of a hermetic container of a compressor.

3. The stator core according to claim 1, further comprising:

a 5 th electromagnetic steel sheet; and

a 6 th electromagnetic steel plate adjacent to the 5 th electromagnetic steel plate,

one of 2 of the plurality of split cores adjacent in the circumferential direction includes the 1 st magnetic steel sheet, the 3 rd magnetic steel sheet, and the 5 th magnetic steel sheet, and the other includes the 2 nd magnetic steel sheet, the 4 th magnetic steel sheet, and the 6 th magnetic steel sheet, and a combination of the 1 st magnetic steel sheet, the 2 nd magnetic steel sheet, the 3 rd magnetic steel sheet, and the 4 th magnetic steel sheet, and a combination of the 5 th magnetic steel sheet and the 6 th magnetic steel sheet are continuously stacked in the same orientation from one end to the other end in the axial direction of the 2 split cores, respectively,

4. A stator core according to claim 1,

has a structure in which teeth and a back yoke are connected in a radial direction,

the tooth includes the 1 st magnetic steel sheet and the 3 rd magnetic steel sheet, the back yoke includes the 2 nd magnetic steel sheet and the 4 th magnetic steel sheet,

the 1 st magnetic steel sheet and the 3 rd magnetic steel sheet are magnetic steel sheets having a lower iron loss than the 2 nd magnetic steel sheet and the 4 th magnetic steel sheet.

5. The stator core according to claim 4, further comprising:

a 5 th magnetic steel plate disposed on one side of the 1 st magnetic steel plate and one side of the 2 nd magnetic steel plate on which the 2 nd magnetic steel plate is disposed;

a 6 th magnetic steel plate disposed on one side of the 1 st magnetic steel plate and one side of the 2 nd magnetic steel plate on which the 1 st magnetic steel plate is disposed;

a 7 th electromagnetic steel sheet having: a portion overlapping with the 5 th electromagnetic steel sheet; and a portion protruding outward from the 5 th magnetic steel sheet, the portion being provided with a projection formed by cutting out and raising a portion of a magnetic steel sheet, having elasticity, and extending obliquely in a direction approaching the 5 th magnetic steel sheet, and a tip of the 7 th magnetic steel sheet protruding outward from the 5 th magnetic steel sheet being adjacent to the 6 th magnetic steel sheet; and

an 8 th electromagnetic steel sheet having: a portion overlapping with the 6 th electromagnetic steel sheet; and a portion protruding outward from the 6 th magnetic steel sheet, a hole into which the protrusion of the 7 th magnetic steel sheet is fitted being provided in the portion, and a tip of the 8 th magnetic steel sheet protruding outward from the 6 th magnetic steel sheet is adjacent to the 5 th magnetic steel sheet,

a combination of the 5 th magnetic steel sheet, the 6 th magnetic steel sheet, the 7 th magnetic steel sheet, and the 8 th magnetic steel sheet is disposed between combinations of the 1 st magnetic steel sheet, the 2 nd magnetic steel sheet, the 3 rd magnetic steel sheet, and the 4 th magnetic steel sheet.

6. A stator core according to claim 5,

the projection of the 7 th electromagnetic steel plate projects toward the same side as the side from which the projection of the 3 rd electromagnetic steel plate projects in the stacking direction.

7. A stator core according to claim 5,

the projection of the 7 th electromagnetic steel plate projects in the stacking direction toward the side opposite to the side where the projection of the 3 rd electromagnetic steel plate projects.

8. A stator core according to any one of claims 1-7,

the hole of the 4 th electromagnetic steel sheet has a circular shape in a plan view,

the projection of the 3 rd electromagnetic steel plate is square in a plan view, and the side length is equal to the radius of the hole of the 4 th electromagnetic steel plate

The magnification is less.

9. A stator core according to any one of claims 1-7,

the projections of the 3 rd electromagnetic steel sheet are provided at a plurality of positions of the 3 rd electromagnetic steel sheet,

the holes of the 4 th electromagnetic steel plate are provided at a plurality of positions of the 4 th electromagnetic steel plate.

10. A compressor is characterized by comprising:

a stator core according to any one of claims 1 to 7; and

and the stator core is fixed on the inner side of the closed container in a hot-assembly manner.

11. A refrigeration cycle apparatus is characterized in that,

a compressor according to claim 10 is provided.