WO2017064782A1

WO2017064782A1 - Stator core, compressor, and refrigeration cycle device

Info

Publication number: WO2017064782A1
Application number: PCT/JP2015/079113
Authority: WO
Inventors: 一弥熊谷; 風間　修; 貞美奥川; 剛仙岩邊; 利夫荒井
Original assignee: 三菱電機株式会社
Priority date: 2015-10-15
Filing date: 2015-10-15
Publication date: 2017-04-20
Also published as: CN106981935A; CN109936225A; CZ2018174A3; CN106981935B; KR102018472B1; KR20180037040A; JPWO2017064782A1; JP6395948B2; CN206302218U

Abstract

A connecting iron core (60A) is a divided iron core having a structure wherein a first electromagnetic steel sheet (71) and a third electromagnetic steel sheet (73) are laminated in the axis direction. A connecting ion core (60B) is a divided iron core having a structure wherein a second electromagnetic steel sheet (72) and a fourth electromagnetic steel sheet (74) are laminated in the axis direction. The third electromagnetic steel sheet (73) has: a portion overlapping the first electromagnetic steel sheet (71); and a portion, which is provided with an elastic protrusion (81) diagonally extending in the direction to be close to the first electromagnetic steel sheet (71), and which is protruding further toward the outside than the first electromagnetic steel sheet (71). The fourth electromagnetic steel sheet (74) has: a portion overlapping the second electromagnetic steel sheet (72); and a portion 4B, which is provided with a hole (82), and which is protruding further toward the outside than the second electromagnetic steel sheet (72). When the connecting iron core (60A) and the connecting iron core (60B) are connected to each other, the protrusion (81) is fitted in the hole (82).

Description

Stator core, compressor and refrigeration cycle device

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

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 part is formed in one division | segmentation boundary part of each division | segmentation iron core, and a recessed part is formed in the other division | segmentation boundary part. Of the two split cores to be connected, the convex part of one split core stores the locking piece protruding in the stacking direction and the locking piece formed in the concave part of the other split core. A locking groove is formed. A locking piece protruding in the stacking direction and a locking groove for receiving the locking piece formed on the convex part of the other divided core are formed in the concave portion of one divided core. By fitting the convex part of one split iron core into the concave part of the other split iron core and fitting the convex part of the other split iron core into the concave part of one split iron core, the locking piece formed on each convex part is in each concave part It is accommodated in the formed locking groove, and both split iron cores are connected.

JP 2009-118676 A

In the technique described in Patent Document 1, two locking pieces protruding in different directions are accommodated in the locking groove for each connection portion of the split iron core. That is, in each one direction, the divided iron cores are coupled together by only one locking piece. Therefore, the bonding force between the split iron cores is weak.

The present invention aims to increase the bonding force between the divided parts of the stator core.

The stator core according to one aspect of the present invention is:
A first electromagnetic steel sheet;
A second electromagnetic steel sheet;
A portion overlapping with the first electromagnetic steel sheet, and a protrusion having an elasticity and extending obliquely in a direction approaching the first electromagnetic steel sheet, and a portion protruding outward from the first electromagnetic steel sheet; A third electromagnetic steel sheet having a tip end protruding outward from the first electromagnetic steel sheet and adjacent to the second electromagnetic steel sheet;
A portion overlapping with the second electromagnetic steel plate, and a portion provided with a hole into which a protrusion of the third electromagnetic steel plate is fitted, and a portion protruding outward from the second electromagnetic steel plate; A fourth electromagnetic steel sheet having a tip end protruding outward from the steel sheet and adjacent to the first electromagnetic steel sheet;
A combination of the first electromagnetic steel plate, the second electromagnetic steel plate, the third electromagnetic steel plate, and the fourth electromagnetic steel plate is laminated in the same direction.

In the present invention, the combination of the first electromagnetic steel plate, the second electromagnetic steel plate, the third electromagnetic steel plate with the projection, and the fourth electromagnetic steel plate with the hole into which the projection of the third electromagnetic steel plate is fitted is laminated in the same direction. Has been. That is, in at least one direction, the divided portions of the stator core are joined by two or more protrusions. Therefore, the binding force between the divided parts of the stator core is strong.

1 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1. FIG. 1 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1. FIG. 1 is a longitudinal sectional view of a compressor according to Embodiment 1. FIG. FIG. 3 is a plan view of the stator core according to the first embodiment. The top view and partial enlarged view of an electromagnetic steel sheet which form the split iron core which concerns on Embodiment 1. FIG. The top view and partial enlarged view of an electromagnetic steel sheet which form the split iron core which concerns on Embodiment 1. FIG. FIG. 3 is a partial cross-sectional view of the split iron core according to the first embodiment. The partial cross-sectional view and the partial longitudinal cross-sectional view which show the procedure which connects the split iron core which concerns on Embodiment 1. FIG. The partial cross-sectional view and the partial longitudinal cross-sectional view which show the procedure which connects the split iron core which concerns on Embodiment 1. FIG. The partial cross-sectional view and the partial longitudinal cross-sectional view which show the procedure which connects the split iron core which concerns on Embodiment 1. FIG. The partial cross-sectional view and the partial longitudinal cross-sectional view which show the procedure which connects the split iron core which concerns on Embodiment 1. FIG. FIG. 6 is a partial cross-sectional view and a partial vertical cross-sectional view of a split iron core according to a modification of the first embodiment. FIG. 6 is a partial cross-sectional view of a split iron core according to a second embodiment. The top view of the hole and protrusion of an electromagnetic steel plate which form the split iron core which concerns on Embodiment 2. FIG. FIG. 6 is a partial cross-sectional view of a split piece of a stator core according to a third embodiment. FIG. 6 is a plan view of a stator core according to a fourth embodiment. The top view and partial enlarged view of the electromagnetic steel plate which form the division | segmentation piece of the stator core which concerns on Embodiment 4. FIG. The top view and partial enlarged view of the electromagnetic steel plate which form the division | segmentation piece of the stator core which concerns on Embodiment 4. FIG. FIG. 10 is a partial cross-sectional view of a split piece of a stator core according to a fourth embodiment. FIG. 6 is a partial cross-sectional view and a partial vertical cross-sectional view of a split piece of a stator core according to a fourth embodiment. FIG. 10 is a partial cross-sectional view of a split piece of a stator core according to a fifth embodiment. FIG. 10 is a partial cross-sectional view and a partial vertical cross-sectional view of a split piece of a stator core according to a fifth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part which is the same or it corresponds in each figure. In the description of the embodiments, the description of the same or corresponding parts will be omitted or simplified as appropriate. About the structure of an apparatus, an instrument, components, etc., the material, shape, size, etc. can be suitably changed within the scope of the present invention.

Embodiment 1 FIG.
With reference to FIG.1 and FIG.2, the structure of the refrigerating-cycle apparatus 10 which concerns on this Embodiment is demonstrated.

FIG. 1 shows the refrigerant circuit 11 during the 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 in which a refrigerant circulates. The refrigeration cycle apparatus 10 further includes a compressor 12, a four-way valve 13, a first heat exchanger 14 that is an outdoor heat exchanger, an expansion mechanism 15 that is an expansion valve, and a second heat that is an indoor heat exchanger. And an exchanger 16. The compressor 12, the four-way valve 13, the first heat exchanger 14, the expansion mechanism 15, and the second heat exchanger 16 are connected to the refrigerant circuit 11.

Compressor 12 compresses the refrigerant. The four-way valve 13 switches the direction in which the refrigerant flows between the cooling operation and the heating operation. The first heat exchanger 14 operates as a condenser during the cooling operation, and dissipates the refrigerant compressed by the compressor 12. That is, the first heat exchanger 14 performs heat exchange using the refrigerant compressed by the compressor 12. The first 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 radiated by the condenser. The second 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 second heat exchanger 16 performs heat exchange using the refrigerant compressed by the compressor 12. The second 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.

The control device 17 is specifically a microcomputer. 1 and 2 show only the connection between the control device 17 and the compressor 12, the control device 17 is connected not only to the compressor 12 but also to each element connected to the refrigerant circuit 11. The control device 17 monitors and controls the state of each element.

As the refrigerant circulating in the refrigerant circuit 11, any refrigerant such as R32 refrigerant, R290 (propane) refrigerant, R407C refrigerant, R410A refrigerant, R744 (CO2) refrigerant, R1234yf refrigerant, or the like can be used.

The configuration of the compressor 12 according to the present embodiment will be described with reference to FIG.

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 one-cylinder rotary compressor, but may be a two-cylinder or more rotary compressor, a scroll compressor, or a reciprocating compressor.

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

The sealed container 20 is provided with a suction pipe 21 for sucking refrigerant and a discharge pipe 22 for discharging refrigerant.

The compression mechanism 30 is accommodated in the sealed container 20. Specifically, the compression mechanism 30 is installed in the lower part inside the sealed container 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 sealed container 20. Specifically, the motor 40 is installed in the upper part inside the sealed container 20. In this embodiment, the motor 40 is a concentrated winding motor, but may be a distributed winding motor.

Refrigerator oil for lubricating the sliding portions of the compression mechanism 30 is stored at the bottom of the sealed container 20. As the crankshaft 50 rotates, the refrigeration oil is pumped up by an oil pump provided at the lower portion of the crankshaft 50 and supplied to each sliding portion of the compression mechanism 30. As the refrigerating machine oil, synthetic oils such as POE (polyol ester), PVE (polyvinyl ether), and AB (alkylbenzene) are used.

Hereinafter, details of the motor 40 will be described.

In the present embodiment, the motor 40 is a brushless DC (Direct Current) motor, 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 has a cylindrical shape and is fixed so as to be in contact with the inner peripheral surface of the sealed container 20. The rotor 42 has a cylindrical shape, and is installed inside the stator 41 via 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 formed by punching a plurality of electromagnetic steel sheets having a thickness of 0.1 mm to 1.5 mm, which are mainly composed of iron, into a certain shape, stacked in an axial direction, and fixed by caulking or welding. Is produced. The stator core 43 has an outer diameter larger than the inner diameter of the intermediate portion of the sealed container 20 and is fixed by being shrink-fitted inside the sealed container 20. The winding 44 is wound around the stator core 43. Specifically, the winding 44 is wound around the stator core 43 by concentrated winding via an insulating member 45. The winding 44 is composed of a core wire and at least one layer of a coating covering the core wire. In the present embodiment, the material of the core wire is copper. The material of the coating is AI (amidoimide) / EI (ester imide). The material of the insulating member 45 is PET (polyethylene terephthalate). The material of the core wire may be aluminum. The material of the insulating member 45 is 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 a lead wire 25 is connected to the winding 44.

The rotor 42 includes a rotor core 46 and a permanent magnet 48. As with the stator core 43, the rotor core 46 is formed by punching a plurality of electromagnetic steel sheets mainly composed of iron and having a thickness of 0.1 millimeters to 1.5 millimeters into a certain shape in the axial direction. Laminated and fixed by caulking or welding. The permanent magnet 48 is 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 in which the main shaft portion 52 of the crankshaft 50 is shrink-fitted or press-fitted is formed in the center of the rotor core 46 in 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 becomes one of the passages of the gas refrigerant that is discharged from the discharge muffler 35 described later to the space in the sealed container 20.

Although not shown, when the motor 40 is configured as an induction motor, a plurality of slots formed in the rotor core 46 are filled or inserted with a conductor formed of aluminum or copper. A squirrel-cage winding in which both ends of the conductor are short-circuited by end rings is formed.

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 and the winding 44 of the motor 40 are electrically connected.

Further, a discharge pipe 22 having both ends opened in the axial direction is attached to the top of the sealed container 20. The gas refrigerant discharged from the compression mechanism 30 is discharged from the space in the sealed container 20 through the discharge pipe 22 to the external refrigerant circuit 11.

Hereinafter, details of the compression mechanism 30 will be described.

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 circumference of the cylinder 31 is circular in plan view. A cylinder chamber that is a circular space in plan view is formed inside the cylinder 31. A suction port for sucking 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 has a ring shape. Therefore, the inner periphery and outer periphery of the piston 32 are circular in plan view. The piston 32 rotates eccentrically in the cylinder chamber. The piston 32 is slidably fitted to an eccentric shaft portion 51 of the crankshaft 50 that serves as a rotation shaft of the piston 32.

Although not shown, the cylinder 31 is provided with a vane groove that is connected to the cylinder chamber and extends in the radial direction. A back pressure chamber that is a circular space in plan view connected to the vane groove is formed outside the vane groove. A vane for partitioning the cylinder chamber into a low-pressure suction chamber and a high-pressure compression chamber is installed in the vane groove. The vane has a plate shape with a rounded tip. The vane is always pressed against the piston 32 by a vane spring provided in the back pressure chamber. Since the inside of the sealed container 20 is at a high pressure, when the operation of the compressor 12 is started, a force due to the 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. To do. For this reason, the vane spring is mainly used for the purpose of pressing the vane against the piston 32 at the start of the compressor 12 in which there is no difference in pressure between the sealed container 20 and the cylinder chamber.

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 that is a portion above the eccentric shaft portion 51 of the crankshaft 50. The main bearing 33 closes the cylinder chamber of the cylinder 31 and the upper side of the vane groove.

The secondary bearing 34 has a T shape when viewed from the side. The sub-bearing 34 is slidably fitted to a sub-shaft portion 53 that is a portion below the eccentric shaft portion 51 of the crankshaft 50. The secondary 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, respectively, and support a crankshaft 50 that is a rotating 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 by the vane into the suction chamber and the compression chamber. The main bearing 33 is provided with a discharge valve that closes and opens the discharge port.

The discharge muffler 35 is attached to the outside of the main bearing 33. The high-temperature and high-pressure gas refrigerant discharged through the discharge valve once enters the discharge muffler 35 and is then discharged from the discharge muffler 35 into the space in the sealed container 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 attached to the outside of a bearing provided with a discharge port and a discharge valve.

A suction muffler 23 is provided beside the sealed container 20. The suction muffler 23 sucks low-pressure gas refrigerant from the refrigerant circuit 11. The suction muffler 23 prevents the liquid refrigerant from directly entering the cylinder chamber of the cylinder 31 when the liquid refrigerant returns. The suction muffler 23 is connected to a suction port provided on the outer peripheral surface of the cylinder 31 via a suction pipe 21. The main body of the suction muffler 23 is fixed to the side surface of the sealed 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 may be gray cast iron or carbon steel. The material of the piston 32 is alloy steel containing chromium or the like. The material of the vane is high speed tool steel.

Although not shown, when the compressor 12 is configured as a swing type rotary compressor, a vane is provided integrally with the piston 32. When the crankshaft 50 is driven, the vane enters and exits along a groove in a support that is rotatably attached to the piston 32. The vane moves back and forth in the radial direction while swinging according to the rotation of the piston 32, thereby dividing the inside of the cylinder chamber into a compression chamber and a suction chamber. The support is composed of two columnar members having a semicircular cross section. The support body is rotatably fitted in a circular holding hole formed in an intermediate portion between the suction port and the discharge port of the cylinder 31.

Hereinafter, the operation of the compressor 12 will be described.

Electric power is supplied from the terminal 24 to the stator 41 of the motor 40 via the lead wire 25. As a result, a current flows through the winding 44 of the stator 41 and a 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. As the rotor 42 rotates, the crankshaft 50 fixed to the rotor 42 rotates. As the crankshaft 50 rotates, the piston 32 of the compression mechanism 30 rotates eccentrically in the cylinder chamber of the cylinder 31 of the compression mechanism 30. A cylinder chamber that is a space between the cylinder 31 and the piston 32 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, whereby low-pressure gas refrigerant is sucked from the suction muffler 23. In the compression chamber, the gas refrigerant therein is compressed by gradually reducing the volume. The compressed, high-pressure and high-temperature gas refrigerant is discharged from the discharge muffler 35 into the space in the sealed container 20. The discharged gas refrigerant further passes through the motor 40 and is discharged out of the sealed container 20 from the discharge pipe 22 at the top of the sealed container 20. The refrigerant discharged to the outside of the sealed container 20 returns to the suction muffler 23 again through the refrigerant circuit 11.

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

*** Explanation of configuration ***
The configuration of the stator core 43 will be described with reference to FIG.

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 installed inside the stator core 43 when the motor 40 is configured to include the stator core 43. The number of divided cores 60 may be an arbitrary number, but in the present embodiment, it is nine.

The nine divided cores 60 include one connecting core 60A and one connecting core 60B. The number of the connecting cores 60A may be any number, and two or more divided cores 60 may correspond to the connecting core 60A. The number of connecting cores 60B is the same as the number of connecting cores 60A, and two or more split cores 60 may correspond to the connecting core 60B. When two or more split cores 60 correspond to the connecting core 60A, or when two or more split cores 60 correspond to the connecting core 60B, there is a split core 60 that serves as both the connecting core 60A and the connecting core 60B. Also good.

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

In each divided iron core 60, the teeth 61 extend from the inner side in the radial direction of the back yoke 62. The teeth 61 have a shape that extends inward in the radial direction with a constant width from the root, and has a shape in which the width is widened at the tip. A winding 44 is wound around a portion of the tooth 61 extending at a certain width. When a current is passed through the winding 44, the tooth 61 around which the winding 44 is wound becomes a magnetic pole. The direction of the magnetic pole is determined by the direction of the current flowing through the winding 44.

Referring to FIG. 5, FIG. 6 and FIG. 7, the structure of the electromagnetic steel sheet forming the connecting iron core 60A and the connecting iron core 60B will be described.

The connecting core 60A is a split core 60 having a structure in which a first electromagnetic steel plate 71 and a third electromagnetic steel plate 73 are laminated in the axial direction. Specifically, the connecting iron core 60A has a structure in which the first electromagnetic steel plates 71 and the third electromagnetic steel plates 73 are alternately arranged in the axial direction one by one. The “axial direction” is the same direction as the rotational axis direction of the rotor 42 that is installed inside the stator core 43 when the motor 40 is configured to include the stator core 43. FIG. 5 shows the shape of the first electromagnetic steel plate 71 and shows an enlarged connection portion of the first electromagnetic steel plate 71. FIG. 6 shows the shape of the third electromagnetic steel plate 73 and also shows an enlarged connection portion of the third electromagnetic steel plate 73. FIG. 7 shows a connecting portion of the first electromagnetic steel plate 71 and the third electromagnetic steel plate 73 in any four consecutive layers L1 to L4. Although it is desirable that the number of the first electromagnetic steel sheets 71 and the third electromagnetic steel sheets 73 be greater than four, only four layers L1 to L4 are shown here for convenience of explanation.

The connecting iron core 60B is a divided iron core 60 having a structure in which a second electromagnetic steel plate 72 and a fourth electromagnetic steel plate 74 are laminated in the axial direction. Specifically, the connecting iron core 60B has a structure in which the second electromagnetic steel plates 72 and the fourth electromagnetic steel plates 74 are alternately arranged in the axial direction one by one. FIG. 5 shows the shape of the fourth electromagnetic steel plate 74 and shows an enlarged connection portion of the fourth electromagnetic steel plate 74. FIG. 6 shows the shape of the second electromagnetic steel plate 72 and shows an enlarged connection portion of the second electromagnetic steel plate 72. FIG. 7 shows a connecting portion of the second electromagnetic steel plate 72 and the fourth electromagnetic steel plate 74 in the layers L1 to L4. The number of laminations of the second electromagnetic steel plate 72 and the fourth electromagnetic steel plate 74 is the same as the number of laminations of the first electromagnetic steel plate 71 and the third electromagnetic steel plate 73.

The third electromagnetic steel plate 73 has a portion 3A that overlaps with the first electromagnetic steel plate 71 and a portion 3B that is provided with a protrusion 81 and protrudes outward from the first electromagnetic steel plate 71. When the connecting iron core 60 A and the connecting iron core 60 B are connected, the end 3 C of the third electromagnetic steel plate 73 protruding outward from the first electromagnetic steel plate 71 is adjacent to the second electromagnetic steel plate 72.

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

The fourth electromagnetic steel plate 74 has a portion 4A that overlaps with the second electromagnetic steel plate 72, and a portion 4B that is provided with a hole 82 and protrudes outward from the second electromagnetic steel plate 72. When the connecting iron core 60 A and the connecting iron core 60 B are connected, the end 4 C of the fourth electromagnetic steel plate 74 protruding outward from the second electromagnetic steel plate 72 is adjacent to the first electromagnetic steel plate 71.

The hole 82 of the fourth electromagnetic steel plate 74 may have an arbitrary shape, but in the present embodiment, it has a rectangular shape in plan view. When the connecting iron core 60 A and the connecting iron core 60 B are connected, the projections 81 of the third electromagnetic steel plate 73 are fitted in the holes 82. Thereby, at least in the direction in which the protrusion 81 protrudes, the connecting iron core 60A and the connecting iron core 60B are coupled by the same number of protrusions 81 as the number of the third electromagnetic steel plates 73. Therefore, the greater the number of protrusions 81, the stronger the coupling force between the connecting iron core 60A and the connecting iron core 60B.

*** Explanation of procedure ***
A procedure for realizing the configuration of the stator core 43 will be described with reference to FIGS. Specifically, a procedure for connecting the connecting iron core 60A and the connecting iron core 60B will be described. This procedure corresponds to a part of the steps of the method for manufacturing the stator core 43 according to the present embodiment.

First, as shown in FIG. 8, the fourth electromagnetic steel plate 74 and the first electromagnetic steel plate 71 are in the same layer in the connecting iron core 60 A having the protrusion 81 toward the connecting iron core 60 B having the hole 82. The steel plate 72 and the third electromagnetic steel plate 73 are moved in the circumferential direction so that they are in the same layer.

As shown in FIG. 9, the third electromagnetic steel plate 73 of the layer L2 is inserted into a gap generated under the fourth electromagnetic steel plate 74 of the upper layer L1. In the process of inserting the third electromagnetic steel plate 73 of the layer L2, the projection 81 of the third electromagnetic steel plate 73 of the layer L2 protrudes from the circumferential end of the fourth electromagnetic steel plate 74 of the layer L1. It receives force on the opposite side and elastically deforms. Specifically, as the third electromagnetic steel plate 73 of the layer L2 is inserted, the protrusion 81 is gradually crushed by the circumferential end of the fourth electromagnetic steel plate 74 of the layer L1 that contacts the inclined surface of the protrusion 81. Go. The circumferential end portion of the fourth electromagnetic steel plate 74 corresponds to the end 4C of the fourth electromagnetic steel plate 74 of the layer L1 shown in FIG.

Similarly to the third electromagnetic steel plate 73 of the layer L2, the third electromagnetic steel plate 73 of the layer L4 is also inserted into the gap generated below the fourth electromagnetic steel plate 74 of the upper layer L3.

As described above, in the present embodiment, since the projection 81 of the third electromagnetic steel plate 73 is elastically deformed, the third electromagnetic steel plate 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 third electromagnetic steel plate 73 of the layer L2 reaches the hole 82 of the fourth electromagnetic steel plate 74 of the layer L1, it returns to its original shape by the elastic force and fits into the hole 82. Thereby, the 3rd electromagnetic steel plate 73 of the layer L2 and the 4th electromagnetic steel plate 74 of the layer L1 are couple | bonded. The third electromagnetic steel plate 73 of the layer L4 and the fourth electromagnetic steel plate 74 of the layer L3 are also coupled in the same manner as the third electromagnetic steel plate 73 of the layer L2 and the fourth electromagnetic steel plate 74 of the layer L1.

As shown in FIG. 11, even if the connecting iron core 60A is pulled in the circumferential direction toward the opposite side to the connecting iron core 60B, the protrusion 81 of the connecting iron core 60A is fitted in the hole 82 of the connecting iron core 60B. Therefore, the contact force between the protrusion 81 and the inner wall of the hole 82 works and the connecting iron core 60A is not separated from the connecting iron core 60B.

As described above, the connecting iron core 60A does not move even when pulled toward the opposite side of the connecting iron core 60B, but can move if pushed toward the connecting iron core 60B. When the stator core 43 is shrink-fitted into the sealed container 20 of the compressor 12, a force that contracts the stator core 43 in the circumferential direction works. In this embodiment, the connecting core 60A is connected to the connecting core 60B. The force can be absorbed by moving toward. For this reason, the roundness of the inner diameter of the stator core 43 is easily obtained. Moreover, since stress is not concentrated on the connecting portion when the stator core 43 is shrink-fitted, it is possible to avoid occurrence of iron loss in the connecting portion.

*** Explanation of the effect of the embodiment ***
In the present embodiment, the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73 with the projection 81, and the fourth electromagnetic with the hole 82 into which the projection 81 of the third electromagnetic steel plate 73 is fitted. The combination with the steel plate 74 is laminated in the same direction. Since the protrusions 81 of any combination protrude in the same direction, at least in that direction, the connecting iron core 60A and the connecting iron core 60B are coupled by the two or more protrusions 81. Therefore, the coupling force between the connecting iron core 60A and the connecting iron core 60B is strong. Here, the connecting iron core 60 A and the connecting iron core 60 B correspond to divided portions of the stator core 43.

In the present embodiment, the hole 82 of the fourth electromagnetic steel plate 74 is provided in a layer different from the layer provided with the protrusion 81 of the third electromagnetic steel plate 73. Therefore, there is no need for welding, and the connecting core 60A and the connecting core 60B can be connected inexpensively and easily.

In the technique described in Patent Document 1, gaps that extend greatly in the stacking direction are generated at the top and bottom of the projections formed at the division boundary and the depressions formed at the division boundary. Such a gap reduces the magnetic path of the stator and causes a reduction in motor efficiency. On the other hand, in the present embodiment, the first electromagnetic steel plates 71 and the third electromagnetic steel plates 73 protruding outward from the first electromagnetic steel plates 71 are alternately stacked one by one, and therefore in the stacking direction. The resulting gap is small. The same applies to the second electromagnetic steel plate 72 and the fourth electromagnetic steel plate 74. Therefore, it is not necessary to reduce the magnetic path of the stator 41, and as a result, the motor efficiency is maintained.

*** Other configurations ***
Each of the teeth 61 may have a structure in which a portion extending at a certain width and a tip are connected in the radial direction instead of being integrally formed. As the connecting method, a method of connecting the connecting iron core 60A and the connecting iron core 60B can be used. That is, a method of fitting the projection 81 of the electromagnetic steel sheet into the hole 82 of another electromagnetic steel sheet can be used.

In the present embodiment, a combination of the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74 is continuously laminated in the same direction. Between the combination of the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74, another combination of electromagnetic steel plates may be disposed. In the following, a difference from this embodiment will be mainly described for one of such examples.

With reference to FIG. 12, the structure of the stator core 43 which concerns on the modification of this Embodiment is demonstrated.

In this modification, a combination of the fifth electromagnetic steel plate 75 and the sixth electromagnetic steel plate 76 is disposed between the combination of the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74. Has been.

The connecting iron core 60A is a divided iron core 60 having a structure in which a first electromagnetic steel plate 71, a third electromagnetic steel plate 73, and a fifth electromagnetic steel plate 75 are laminated in the axial direction. Specifically, the connecting iron core 60A has a structure in which one first electromagnetic steel plate 71, one third electromagnetic steel plate 73, and two fifth electromagnetic steel plates 75 are sequentially arranged in the axial direction. Yes. FIG. 12 shows a connecting portion of the first electromagnetic steel plate 71, the third electromagnetic steel plate 73, and the fifth electromagnetic steel plate 75 in any six consecutive layers L1 to L6. The number of laminations of the first electromagnetic steel plate 71, the third electromagnetic steel plate 73, and the fifth electromagnetic steel plate 75 is preferably greater than six, but here, for convenience of explanation, only six layers L1 to L6 are shown. .

The connecting iron core 60B is a divided iron core 60 having a structure in which a second electromagnetic steel plate 72, a fourth electromagnetic steel plate 74, and a sixth electromagnetic steel plate 76 are laminated in the axial direction. Specifically, the connecting iron core 60B has a structure in which one fourth electromagnetic steel plate 74, one second electromagnetic steel plate 72, and two sixth electromagnetic steel plates 76 are sequentially arranged in the axial direction. Yes. FIG. 12 shows a connecting portion of the second electromagnetic steel plate 72, the fourth electromagnetic steel plate 74, and the sixth electromagnetic steel plate 76 in the layers L1 to L6. The number of laminations of the second electromagnetic steel plate 72, the fourth electromagnetic steel plate 74, and the sixth electromagnetic steel plate 76 is the same as the number of laminations of the first electromagnetic steel plate 71, the third electromagnetic steel plate 73, and the fifth electromagnetic steel plate 75.

When the connecting iron core 60 A and the connecting iron core 60 B are connected, the sixth electromagnetic steel plate 76 is adjacent to the fifth electromagnetic steel plate 75.

In this modification, the number of gaps generated in the stacking direction at the connecting portion can be reduced. There is also a layer without protrusions 81 and holes 82. Therefore, the magnetic path of the stator 41 can be increased, and as a result, the motor efficiency is improved.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

The configuration of the stator core 43 according to the present embodiment will be described with reference to FIGS.

In Embodiment 1, the projection 81 of the third electromagnetic steel plate 73 and the hole 82 of the fourth electromagnetic steel plate 74 are both rectangular in plan view. On the other hand, in the present embodiment, the projection 81 of the third electromagnetic steel plate 73 has a square shape in plan view, and the hole 82 of the fourth electromagnetic steel plate 74 has a circular shape in plan view. It is desirable that the length of one side of the protrusion 81 is not more than √2 times the radius R of the hole 82. In this embodiment, the length of one side is √2 times the radius R of the hole 82, that is, √2R.

When the connecting iron core 60A and the connecting iron core 60B are connected, the third electromagnetic steel plate 73 of the layer L2 is placed under the fourth electromagnetic steel plate 74 of the upper layer L1 as in the first embodiment. Inserted into the resulting gap. In the process of inserting the third electromagnetic steel plate 73 of the layer L2, the projection 81 of the third electromagnetic steel plate 73 of the layer L2 protrudes from the circumferential end of the fourth electromagnetic steel plate 74 of the layer L1. It receives force on the opposite side and elastically deforms. Similarly to the third electromagnetic steel plate 73 of the layer L2, the third electromagnetic steel plate 73 of the layer L4 is also inserted into the gap generated below the fourth electromagnetic steel plate 74 of the upper layer L3.

When the protrusion 81 of the third electromagnetic steel plate 73 of the layer L2 reaches the hole 82 of the fourth electromagnetic steel plate 74 of the layer L1, it returns to its original shape by the elastic force and fits into the hole 82. Thereby, the 3rd electromagnetic steel plate 73 of the layer L2 and the 4th electromagnetic steel plate 74 of the layer L1 are couple | bonded. The third electromagnetic steel plate 73 of the layer L4 and the fourth electromagnetic steel plate 74 of the layer L3 are also coupled in the same manner as the third electromagnetic steel plate 73 of the layer L2 and the fourth electromagnetic steel plate 74 of the layer L1.

As shown in FIG. 14, in the present embodiment, even if the protrusion 81 moves in an oblique direction with respect to the circumferential direction, it easily fits into the hole 82. Therefore, the tolerance with respect to the shift | offset | difference of the insertion direction of the 3rd electromagnetic steel plate 73 increases. That is, the degree of freedom in the insertion direction of the third electromagnetic steel sheet 73 is increased.

In the present embodiment, a combination of the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74 is continuously laminated in the same direction. Between the combination of the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74, another combination of electromagnetic steel plates may be disposed. Specifically, as in the modification of the first embodiment, a combination of the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74 is shown in FIG. Further, a combination of the fifth electromagnetic steel plate 75 and the sixth electromagnetic steel plate 76 may be arranged.

Embodiment 3 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

Referring to FIG. 15, the configuration of the stator core 43 according to the present embodiment will be described.

In the first embodiment, the projection 81 of the third electromagnetic steel plate 73 is provided only at one location of the third electromagnetic steel plate 73, and the hole 82 of the fourth electromagnetic steel plate 74 is provided only at one location of the fourth electromagnetic steel plate 74. It has been. On the other hand, in the present embodiment, the protrusions 81 of the third electromagnetic steel plate 73 are provided at a plurality of locations on the third electromagnetic steel plate 73, and the holes 82 of the fourth electromagnetic steel plate 74 are also provided at the plurality of locations on the fourth electromagnetic steel plate 74. Is provided. Specifically, the protrusions 81 are provided at two locations on the third electromagnetic steel plate 73, and the holes 82 are also provided at two locations on the fourth electromagnetic steel plate 74.

When the connecting iron core 60A and the connecting iron core 60B are connected, the third electromagnetic steel plate 73 of the layer L2 is placed under the fourth electromagnetic steel plate 74 of the upper layer L1 as in the first embodiment. Inserted into the resulting gap. In the process of inserting the third electromagnetic steel plate 73 of the layer L2, the two protrusions 81 of the third electromagnetic steel plate 73 of the layer L2 are axially arranged by the circumferential ends of the fourth electromagnetic steel plate 74 of the layer L1. The projection 81 is elastically deformed by receiving a force on the side opposite to the side from which the projection 81 protrudes. Similarly to the third electromagnetic steel plate 73 of the layer L2, the third electromagnetic steel plate 73 of the layer L4 is also inserted into the gap generated below the fourth electromagnetic steel plate 74 of the upper layer L3.

When the two protrusions 81 of the third electromagnetic steel sheet 73 of the layer L2 reach the corresponding holes 82 of the fourth electromagnetic steel sheet 74 of the layer L1, they return to the original shape by elastic force and fit into the corresponding holes 82. Thereby, the 3rd electromagnetic steel plate 73 of the layer L2 and the 4th electromagnetic steel plate 74 of the layer L1 are couple | bonded. The third electromagnetic steel plate 73 of the layer L4 and the fourth electromagnetic steel plate 74 of the layer L3 are also coupled in the same manner as the third electromagnetic steel plate 73 of the layer L2 and the fourth electromagnetic steel plate 74 of the layer L1.

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

Embodiment 4 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

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

The stator core 43 has a structure in which a plurality of divided cores 60 are connected in the circumferential direction as in the first embodiment. The number of divided cores 60 may be any number, but is nine in this embodiment.

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

In each of the split iron cores 60, the teeth 61 are connected to the inner side in the radial direction of the back yoke 62. As in the first embodiment, the teeth 61 extend from the root to the inside in the radial direction with a constant width, and have a shape in which the width is widened at the tip. A winding 44 is wound around a portion of the tooth 61 extending at a certain width.

As described above, in the present embodiment, the stator core 43 has a structure in which nine teeth 61 and nine back yokes 62 are connected 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 nine separately formed teeth 61 and one integrally formed back yoke 62 are connected. The number of teeth 61 may be appropriately changed in the same manner as the number of divided iron cores 60.

The magnetic flux generated by the current at the time of driving the motor 40 that is a compressor motor causes hysteresis loss and eddy current loss in the stator core 43. Hysteresis loss and eddy current loss are factors that reduce motor efficiency as iron loss. As a method for reducing the iron loss, there is a method of using a magnetic steel sheet having a low iron loss, such as a grain-oriented electrical steel sheet. However, a magnetic steel sheet with a low iron loss is expensive, and thus increases the cost. Therefore, in the present embodiment, each divided iron core 60 is divided into a tooth 61 and a back yoke 62, and a magnetic steel sheet having a low iron loss is selectively used for the teeth 61 in which the magnetic flux density is increased. The teeth 61 and the back yoke 62 made of different electromagnetic steel plates need to be coupled with a strong coupling force so that the sound vibration generated at the coupling point does not become a problem.

Referring to FIG. 17, FIG. 18, FIG. 19 and FIG. 20, the structure of the electromagnetic steel sheet forming the teeth 61 and the back yoke 62 will be described.

Each tooth 61 is a divided piece having a structure in which a first electromagnetic steel plate 71 and a third electromagnetic steel plate 73 are laminated in the axial direction. Each of the teeth 61 may have a structure in which only the first electromagnetic steel plate 71 and the third electromagnetic steel plate 73 are laminated, but in the present embodiment, the first electromagnetic steel plate 71, the third electromagnetic steel plate 73, and the first The sixth electromagnetic steel plate 76 and the eighth electromagnetic steel plate 78 are laminated. Specifically, each tooth 61 is composed of one first electromagnetic steel plate 71, one third electromagnetic steel plate 73, one eighth electromagnetic steel plate 78, and one sixth electromagnetic steel plate 76 in order. The structure is arranged in the axial direction. FIG. 17 shows the shape of the first electromagnetic steel plate 71 and shows an enlarged connection portion of the first electromagnetic steel plate 71. FIG. 18 shows the shape of the third electromagnetic steel sheet 73 and also shows an enlarged connection portion of the third electromagnetic steel sheet 73. FIG. 19 shows a connecting portion of the first electromagnetic steel plate 71, the third electromagnetic steel plate 73, the sixth electromagnetic steel plate 76, and the eighth electromagnetic steel plate 78 in any four consecutive layers L1 to L4. The number of laminations of the first electromagnetic steel plate 71, the third electromagnetic steel plate 73, the sixth electromagnetic steel plate 76, and the eighth electromagnetic steel plate 78 is preferably more than four. Here, for convenience of explanation, the four layers L1 to L1 are used. Only L4 is shown. FIG. 20 shows six layers L1 to L6 including the layers L1 to L4.

Each back yoke 62 is a divided piece having a structure in which a second electromagnetic steel plate 72 and a fourth electromagnetic steel plate 74 are laminated in the axial direction. Each back yoke 62 may have a structure in which only the second electromagnetic steel plate 72 and the fourth electromagnetic steel plate 74 are laminated, but in the present embodiment, the second electromagnetic steel plate 72, the fourth electromagnetic steel plate 74, The fifth electromagnetic steel plate 75 and the seventh electromagnetic steel plate 77 are laminated. Specifically, each back yoke 62 has one fourth electromagnetic steel plate 74, one second electromagnetic steel plate 72, one fifth electromagnetic steel plate 75, and one seventh electromagnetic steel plate 77 in order. It has a structure that is repeatedly arranged in the axial direction. FIG. 17 shows the shape of the fourth electromagnetic steel plate 74 and shows an enlarged connection portion of the fourth electromagnetic steel plate 74. FIG. 18 shows the shape of the second electromagnetic steel plate 72 and shows an enlarged connection portion of the second electromagnetic steel plate 72. FIG. 19 shows a connecting portion of the second electromagnetic steel plate 72, the fourth electromagnetic steel plate 74, the fifth electromagnetic steel plate 75, and the seventh electromagnetic steel plate 77 in the layers L1 to L4. The number of laminations of the second electromagnetic steel plate 72 and the fourth electromagnetic steel plate 74 is the same as the number of laminations of the second electromagnetic steel plate 72, the fourth electromagnetic steel plate 74, the fifth electromagnetic steel plate 75, and the seventh electromagnetic steel plate 77.

The first electromagnetic steel plate 71 is an electromagnetic steel plate having a lower iron loss than the second electromagnetic steel plate 72, the fourth electromagnetic steel plate 74, the fifth electromagnetic steel plate 75, and the seventh electromagnetic steel plate 77.

The third electromagnetic steel plate 73 is an electromagnetic steel plate having lower iron loss than the second electromagnetic steel plate 72, the fourth electromagnetic steel plate 74, the fifth electromagnetic steel plate 75, and the seventh electromagnetic steel plate 77, similarly to the first electromagnetic steel plate 71. . The third electromagnetic steel plate 73 includes a portion 3 A that overlaps the first electromagnetic steel plate 71, and a portion 3 B that is provided with a protrusion 81 and protrudes outward from the first electromagnetic steel plate 71. When each of the teeth 61 and the corresponding back yoke 62 are connected, the third electromagnetic steel plate 73 is adjacent to the second electromagnetic steel plate 72 at the end 3C that protrudes outward from the first electromagnetic steel plate 71. ing.

The protrusion 81 of the third electromagnetic steel sheet 73 is the same as that of the first embodiment.

The fourth electromagnetic steel plate 74 has a portion 4A that overlaps with the second electromagnetic steel plate 72, and a portion 4B that is provided with a hole 82 and protrudes outward from the second electromagnetic steel plate 72. When each of the teeth 61 and the corresponding back yoke 62 are connected, the fourth electromagnetic steel plate 74 is adjacent to the first electromagnetic steel plate 71 at the end 4C protruding beyond the second electromagnetic steel plate 72. ing.

The hole 82 of the fourth electromagnetic steel sheet 74 is the same as that of the first embodiment. When each of the teeth 61 and the corresponding back yoke 62 are connected, the projections 81 of the third electromagnetic steel plate 73 are fitted in the holes 82. Accordingly, at least in the direction in which the protrusions 81 protrude, the teeth 61 and the corresponding back yokes 62 are coupled by the same number of protrusions 81 as the number of the third electromagnetic steel plates 73. Therefore, the greater the number of protrusions 81, the stronger the bonding force between the teeth 61 and the back yoke 62.

The fifth electromagnetic steel plate 75 is a part of each back yoke 62. Therefore, when each tooth 61 and the corresponding back yoke 62 are connected, the fifth electromagnetic steel plate 75 is the second of the side having the first electromagnetic steel plate 71 and the side having the second electromagnetic steel plate 72. It arrange | positions at the side with the electromagnetic steel plate 72.

The sixth electromagnetic steel plate 76 is an electromagnetic steel plate having a lower iron loss than the second electromagnetic steel plate 72, the fourth electromagnetic steel plate 74, the fifth electromagnetic steel plate 75, and the seventh electromagnetic steel plate 77, similarly to the first electromagnetic steel plate 71. . The sixth electromagnetic steel plate 76 is a part of each tooth 61. Therefore, when each tooth 61 and the corresponding back yoke 62 are connected, the sixth electromagnetic steel plate 76 is the first of the side having the first electromagnetic steel plate 71 and the side having the second electromagnetic steel plate 72. It arrange | positions at the side with the electromagnetic steel plate 71.

The seventh electromagnetic steel plate 77 has a portion 7A that overlaps with the fifth electromagnetic steel plate 75 and a portion 7B that is provided with a protrusion 81 and protrudes outward from the fifth electromagnetic steel plate 75. When each of the teeth 61 and the corresponding back yoke 62 are connected, the seventh electromagnetic steel plate 77 is adjacent to the sixth electromagnetic steel plate 76 at the end 7C protruding outward from the fifth electromagnetic steel plate 75. ing.

The projection 83 of the seventh electromagnetic steel plate 77 has elasticity. The protrusion 83 extends obliquely in a direction approaching the fifth electromagnetic steel plate 75. The protrusion 83 may be formed by any method, but in the present embodiment, the protrusion 83 is formed by cutting and raising a part of the seventh electromagnetic steel plate 77. The protrusion 83 may have an arbitrary shape, but in the present embodiment, the protrusion 83 has a rectangular shape in plan view. When each of the teeth 61 and the corresponding back yoke 62 are connected, the protrusion 83 protrudes on the same side as the protrusion 81 of the third electromagnetic steel sheet 73 protrudes in the stacking direction.

The eighth electromagnetic steel plate 78 has a portion 8A overlapping the sixth electromagnetic steel plate 76 and a portion 8B provided with a hole 84 and protruding outward from the sixth electromagnetic steel plate 76. When each of the teeth 61 and the corresponding back yoke 62 are connected, the end 8C of the eighth electromagnetic steel plate 78 protruding outward from the sixth electromagnetic steel plate 76 is adjacent to the fifth electromagnetic steel plate 75. ing.

The hole 84 of the eighth electromagnetic steel plate 78 may have an arbitrary shape, but in the present embodiment, it has a rectangular shape in plan view. When each of the teeth 61 and the corresponding back yoke 62 are connected, a projection 83 of a seventh electromagnetic steel plate 77 is fitted in the hole 84. Thus, even in the direction in which the protrusion 83 protrudes, each tooth 61 and the corresponding back yoke 62 are coupled by the same number of protrusions 83 as the number of the seventh electromagnetic steel plates 77. Therefore, as the number of the protrusions 83 increases, the coupling force between each tooth 61 and the corresponding back yoke 62 increases.

*** Explanation of procedure ***
A procedure for realizing the configuration of the stator core 43 will be described with reference to FIG. Specifically, a procedure for connecting one tooth 61 and one back yoke 62 will be described. This procedure corresponds to a part of the steps of the method for manufacturing the stator core 43 according to the present embodiment.

First, the teeth 61 having the protrusions 81 and the holes 84 are formed in the same layer as the fourth electromagnetic steel sheet 74 and the first electromagnetic steel sheet 71 toward the back yoke 62 having the holes 82 and the protrusions 83. And the third electromagnetic steel plate 73 are in the same layer, the fifth electromagnetic steel plate 75 and the eighth electromagnetic steel plate 78 are in the same layer, and the seventh electromagnetic steel plate 77 and the sixth electromagnetic steel plate 76 are in the same layer. , Moved in the radial direction.

The third electromagnetic steel plate 73 of the layer L2 is inserted into a gap generated under the fourth electromagnetic steel plate 74 of the upper layer L1. In the process in which the third electromagnetic steel plate 73 of the layer L2 is inserted, the projection 81 of the third electromagnetic steel plate 73 of the layer L2 protrudes from the radial end of the fourth electromagnetic steel plate 74 of the layer L1. It receives force on the opposite side and elastically deforms. Specifically, as the third electromagnetic steel plate 73 of the layer L2 is inserted, the protrusion 81 is gradually crushed by the radial end of the fourth electromagnetic steel plate 74 of the layer L1 that contacts the inclined surface of the protrusion 81. Go. The radial direction end of the fourth electromagnetic steel plate 74 corresponds to the end 4C of the fourth electromagnetic steel plate 74 of the layer L1 shown in FIG.

Similarly to the third electromagnetic steel plate 73 of the layer L2, the third electromagnetic steel plate 73 of the layer L6 is also inserted into the gap generated under the fourth electromagnetic steel plate 74 of the upper layer L5.

The seventh electromagnetic steel plate 77 of the layer L4 is inserted into a gap generated below the eighth electromagnetic steel plate 78 of the upper layer L3. In the process of inserting the seventh electromagnetic steel plate 77 of the layer L4, the projection 83 of the seventh electromagnetic steel plate 77 of the layer L4 protrudes from the radial projection of the eighth electromagnetic steel plate 78 of the layer L3. It receives force on the opposite side and elastically deforms. Specifically, as the seventh electromagnetic steel plate 77 of the layer L4 is inserted, the protrusion 83 is gradually crushed by the radial end of the eighth electromagnetic steel plate 78 of the layer L3 that contacts the inclined surface of the protrusion 83. Go. The radial direction end of the eighth electromagnetic steel plate 78 corresponds to the end 8C of the eighth electromagnetic steel plate 78 of the layer L3 shown in FIG.

As described above, in the present embodiment, both the projection 81 of the third electromagnetic steel plate 73 and the projection 83 of the seventh electromagnetic steel plate 77 are elastically deformed, so that it is easier than the other methods such as press-fitting. The third electromagnetic steel plate 73 and the seventh electromagnetic steel plate 77 can be inserted.

When the protrusion 81 of the third electromagnetic steel plate 73 of the layer L2 reaches the hole 82 of the fourth electromagnetic steel plate 74 of the layer L1, it returns to its original shape by the elastic force and fits into the hole 82. Thereby, the 3rd electromagnetic steel plate 73 of the layer L2 and the 4th electromagnetic steel plate 74 of the layer L1 are couple | bonded. The third electromagnetic steel plate 73 of the layer L6 and the fourth electromagnetic steel plate 74 of the layer L5 are also coupled in the same manner as the third electromagnetic steel plate 73 of the layer L2 and the fourth electromagnetic steel plate 74 of the layer L1.

When the projection 83 of the seventh electromagnetic steel plate 77 of the layer L4 reaches the hole 84 of the eighth electromagnetic steel plate 78 of the layer L3, it returns to its original shape by the elastic force and fits into the hole 84. Thereby, the seventh electromagnetic steel plate 77 of the layer L4 and the eighth electromagnetic steel plate 78 of the layer L3 are also coupled.

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 in the holes 82 of the back yoke 62. Thus, the tooth 61 is not pulled away from the back yoke 62. Similarly, even if the back yoke 62 is pulled in the radial direction toward the side opposite to the teeth 61, the projection 83 of the back yoke 62 fits into the hole 84 of the tooth 61. The contact force with the inner wall of the hole 84 works and the back yoke 62 is not pulled away from the teeth 61.

*** Explanation of the effect of the embodiment ***
In the present embodiment, the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73 with the projection 81, and the fourth electromagnetic with the hole 82 into which the projection 81 of the third electromagnetic steel plate 73 is fitted. The combination with the steel plate 74 is laminated in the same direction. In the present embodiment, a fifth electromagnetic steel plate 75, a sixth electromagnetic steel plate 76, and a combination of the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74, A combination of the seventh electromagnetic steel plate 77 having the projection 83 and the eighth electromagnetic steel plate 78 having the hole 84 into which the projection 83 of the seventh electromagnetic steel plate 77 is fitted is disposed. Since the projection 83 of the seventh electromagnetic steel plate 77 protrudes in a direction different from the projection 81 of the third electromagnetic steel plate 73, the tooth 61 and the back yoke 62 are connected by the two types of

projections

81 and 83 in two or more directions. Are combined. Therefore, 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 configurations ***
Not only the electromagnetic steel sheet forming the teeth 61 but also the electromagnetic steel sheet forming the back yoke 62 may be an electromagnetic steel sheet with low iron loss. That is, the second electromagnetic steel plate 72 and the fourth electromagnetic steel plate 74 may be electromagnetic steel plates with low iron loss, like the first electromagnetic steel plate 71 and the third electromagnetic steel plate 73.

A combination of the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74, the fifth electromagnetic steel plate 75, the sixth electromagnetic steel plate 76, the seventh electromagnetic steel plate 77, and the eighth electromagnetic steel plate. Between the combination with 78, another combination of electromagnetic steel sheets may be arranged. Specifically, as in the modification of the first embodiment, the combination of the first electromagnetic steel plate 71, the second electromagnetic steel plate 72, the third electromagnetic steel plate 73, and the fourth electromagnetic steel plate 74, and the fifth electromagnetic steel plate 75. The combination of the fifth electromagnetic steel plate 75 and the sixth electromagnetic steel plate 76 shown in FIG. 12 is arranged between the combination of the sixth electromagnetic steel plate 76, the seventh electromagnetic steel plate 77, and the eighth electromagnetic steel plate 78. Also good.

Embodiment 5 FIG.
In the present embodiment, differences from the fourth embodiment will be mainly described.

In Embodiment 4, the projection 83 of the seventh electromagnetic steel plate 77 protrudes on the same side as the side from which the projection 81 of the third electromagnetic steel plate 73 protrudes in the stacking direction. On the other hand, in the present embodiment, the protrusion 83 of the seventh electromagnetic steel plate 77 protrudes on the side opposite to the side where the protrusion 81 of the third electromagnetic steel plate 73 protrudes in the stacking direction. In the stacking direction, the positional relationship between the fifth electromagnetic steel plate 75 and the seventh electromagnetic steel plate 77 and the positional relationship between the sixth electromagnetic steel plate 76 and the eighth electromagnetic steel plate 78 are opposite to those in the fourth embodiment. .

When one tooth 61 and one back yoke 62 are connected, the third electromagnetic steel plate 73 of the layer L2 is connected to the fourth electromagnetic of the layer L1 that is one layer higher, as in the fourth embodiment. It is inserted into a gap generated under the steel plate 74. In the process in which the third electromagnetic steel plate 73 of the layer L2 is inserted, the projection 81 of the third electromagnetic steel plate 73 of the layer L2 protrudes from the radial end of the fourth electromagnetic steel plate 74 of the layer L1. It receives force on the opposite side and elastically deforms. Similarly to the third electromagnetic steel plate 73 of the layer L2, the third electromagnetic steel plate 73 of the layer L6 is also inserted into the gap generated below the fourth electromagnetic steel plate 74 of the upper layer L5.

Unlike the fourth embodiment, the seventh electromagnetic steel plate 77 of the layer L3 is inserted into a gap generated on the eighth electromagnetic steel plate 78 of the next lower layer L4. In the process of inserting the seventh electromagnetic steel plate 77 of the layer L3, the projection 83 of the seventh electromagnetic steel plate 77 of the layer L3 protrudes from the radial projection of the eighth electromagnetic steel plate 78 of the layer L4. It receives force on the opposite side and elastically deforms. Specifically, as the seventh electromagnetic steel plate 77 of the layer L3 is inserted, the protrusion 83 is gradually crushed by the radial end of the eighth electromagnetic steel plate 78 of the layer L4 that contacts the inclined surface of the protrusion 83. Go. The radial direction end portion of the eighth electromagnetic steel plate 78 corresponds to the end 8C of the eighth electromagnetic steel plate 78 of the layer L4 shown in FIG.

When the protrusion 83 of the seventh electromagnetic steel plate 77 of the layer L3 reaches the hole 84 of the eighth electromagnetic steel plate 78 of the layer L4, it returns to its original shape by the elastic force and fits into the hole 84. Thereby, the seventh electromagnetic steel plate 77 of the layer L3 and the eighth electromagnetic steel plate 78 of the layer L4 are also coupled.

As shown in FIG. 22, in the present embodiment, the protrusion 81 of the tooth 61 and the protrusion 83 of the back yoke 62 protrude in directions different by 180 degrees. Therefore, when the tooth 61 and the back yoke 62 are connected, the protrusion 81 of the tooth 61 and the protrusion 83 of the back yoke 62 are unlikely to interfere with each other.

As mentioned above, although embodiment of this invention was described, you may implement combining some of these embodiment. Alternatively, any one or some of these embodiments may be partially implemented. Specifically, any one of those described as “parts” in the description of these embodiments may be employed, or some arbitrary combinations may be employed. In addition, this invention is not limited to these embodiment, A various change is possible as needed.

10 refrigeration cycle apparatus, 11 refrigerant circuit, 12 compressor, 13 four-way valve, 14 first heat exchanger, 15 expansion mechanism, 16 second heat exchanger, 17 control device, 20 sealed container, 21 suction pipe, 22 discharge pipe , 23 Suction muffler, 24 terminal, 25 lead wire, 30 compression mechanism, 31 cylinder, 32 piston, 33 main bearing, 34 sub bearing, 35 discharge muffler, 40 motor, 41 stator, 42 rotor, 43 stator core, 44 windings, 45 insulating members, 46 rotor cores, 48 permanent magnets, 49 through holes, 50 crankshafts, 51 eccentric shafts, 52 main shafts, 53 subshafts, 60 split cores, 60A connecting cores, 60B connecting cores , 61 teeth, 62 back yoke, 71 first electromagnetic steel plate, 72 second electromagnetic steel plate, 73 third Steel sheets, 74 fourth electromagnetic steel plates, 75 a fifth electromagnetic steel plates, 76 a sixth electromagnetic steel plates, 77 seventh electromagnetic steel plates, 78 eighth electromagnetic steel plates, 81 projections, 82 holes, 83 projection, 84 holes.

Claims

A first electromagnetic steel sheet;
A second electromagnetic steel sheet;
A portion overlapping with the first electromagnetic steel sheet, and a protrusion having an elasticity and extending obliquely in a direction approaching the first electromagnetic steel sheet, and a portion protruding outward from the first electromagnetic steel sheet; A third electromagnetic steel sheet having a tip end protruding outward from the first electromagnetic steel sheet and adjacent to the second electromagnetic steel sheet;
A portion overlapping with the second electromagnetic steel plate, and a portion provided with a hole into which a protrusion of the third electromagnetic steel plate is fitted, and a portion protruding outward from the second electromagnetic steel plate; A fourth electromagnetic steel sheet having a tip end protruding outward from the steel sheet and adjacent to the first electromagnetic steel sheet;
A stator core in which a combination of the first electromagnetic steel plate, the second electromagnetic steel plate, the third electromagnetic steel plate, and the fourth electromagnetic steel plate is laminated in the same direction.
The stator core according to claim 1, wherein a combination of the first electromagnetic steel plate, the second electromagnetic steel plate, the third electromagnetic steel plate, and the fourth electromagnetic steel plate is continuously laminated in the same direction.
A fifth electrical steel sheet;
A sixth electrical steel sheet adjacent to the fifth electrical steel sheet;
A combination of the fifth electromagnetic steel plate and the sixth electromagnetic steel plate is disposed between the first electromagnetic steel plate, the second electromagnetic steel plate, the third electromagnetic steel plate, and the fourth electromagnetic steel plate. The stator core according to 1.
A fifth electromagnetic steel sheet disposed on the side where the second electromagnetic steel sheet is present among the side where the first electromagnetic steel sheet is present and the side where the second electromagnetic steel sheet is present;
A sixth electromagnetic steel sheet disposed on the side where the first electromagnetic steel sheet is located among the side where the first electromagnetic steel sheet is present and the side where the second electromagnetic steel sheet is present;
A portion that overlaps with the fifth electromagnetic steel plate, and a protrusion that has elasticity and extends obliquely in a direction approaching the fifth electromagnetic steel plate, and has a portion protruding outward from the fifth electromagnetic steel plate, A seventh electromagnetic steel sheet in which the end protruding beyond the fifth electromagnetic steel sheet is adjacent to the sixth electromagnetic steel sheet;
A portion overlapping with the sixth electromagnetic steel plate; and a hole in which a projection of the seventh electromagnetic steel plate is fitted and protruding outward from the sixth electromagnetic steel plate; An 8th electrical steel sheet in which the end protruding beyond the steel sheet is adjacent to the 5th electrical steel sheet;
Between the first electromagnetic steel plate, the second electromagnetic steel plate, the third electromagnetic steel plate, and the fourth electromagnetic steel plate, the fifth electromagnetic steel plate, the sixth electromagnetic steel plate, the seventh electromagnetic steel plate, and the eighth The stator core according to claim 1, wherein a combination with an electromagnetic steel sheet is arranged.
The stator iron core according to claim 4, wherein the protrusion of the seventh electromagnetic steel sheet protrudes in the same direction as the protrusion of the protrusion of the third electromagnetic steel sheet in the stacking direction.
The stator iron core according to claim 4, wherein the protrusions of the seventh electromagnetic steel sheet protrude in a direction opposite to a side where the protrusions of the third electromagnetic steel sheet protrude in the stacking direction.
The hole of the fourth electromagnetic steel sheet has a circular shape in plan view,
7. The projection according to claim 1, wherein the protrusion of the third electromagnetic steel sheet has a square shape in plan view, and the length of one side is not more than √2 times the radius of the hole of the fourth electromagnetic steel sheet. Stator iron core.
The protrusions of the third electromagnetic steel plate are provided at a plurality of locations of the third electromagnetic steel plate,
The stator iron core according to any one of claims 1 to 7, wherein the holes of the fourth electromagnetic steel plate are provided at a plurality of locations of the fourth electromagnetic steel plate.
A divided core having a structure in which the first electromagnetic steel sheet and the third electromagnetic steel sheet are laminated in the axial direction, and a divided iron core having a structure in which the second electromagnetic steel sheet and the fourth electromagnetic steel sheet are laminated in the axial direction. The stator core according to any one of claims 1 to 8, wherein the stator core includes a structure in which a plurality of divided cores are connected in a circumferential direction.
A divided piece having a structure in which the first electromagnetic steel plate and the third electromagnetic steel plate are laminated in the axial direction, and a divided piece having a structure in which the second electromagnetic steel plate and the fourth electromagnetic steel plate are laminated in the axial direction. The stator core according to any one of claims 1 to 8, wherein the stator core has a structure connected in a radial direction.
The stator iron core according to any one of claims 1 to 10,
A compressor provided with an airtight container in which the stator iron core is fixed by shrink fitting.
A refrigeration cycle apparatus comprising the compressor according to claim 11.