Rotor of an electric motor, electric motor, compressor, and refrigeration cycle device

Abstract

An electric motor rotor according to the present invention comprises: a plurality of annular first rotor iron core electromagnetic steel plates laminated and arranged in the axial direction, each of the steel plates having a first inner diameter section fastened to a rotating shaft, first rivet insertion holes provided so as to extend in the axial direction of the rotating shaft and arranged so as to be spaced apart at intervals in the circumferential direction, and a magnet insertion hole provided so as to extend in the axial direction; a plurality of annular second rotor iron core electromagnetic steel plates laminated and arranged in the axial direction, each of the steel plates having a magnet inserted into a magnet insertion hole, a second inner diameter section fastened to the rotating shaft, and second rivet insertion holes provided so as to extend in the axial direction and arranged so as to be spaced apart at intervals in the circumferential direction; an annular third rotor iron core electromagnetic steel plate arranged between the first rotor iron core electromagnetic steel plates and the second rotor iron core electromagnetic steel plates in the axial direction, and having a third inner diameter section fastened to the rotating shaft, and a third outer diameter section positioned more radially inward than the first rivet insertion holes; a first end plate portion arranged at the outer circumference of the third outer diameter section, made of a non-magnetic material, arranged at one axial end of the magnet insertion hole, having an annular shape, and having first end plate rivet insertion holes provided so as to extend in the axial direction and arranged so as to be spaced apart at intervals in the circumferential direction of a semi-annular portion of the annular shape, and second end plate rivet insertion holes arranged so as to correspond to the first end plate rivet insertion holes and to be spaced apart at intervals in the circumferential direction of the remaining semi-annular portion of the annular shape, and provided so as to extend in the axial direction; a second end plate portion made of a non-magnetic material, arranged at the other axial end of the magnet insertion hole, having an annular shape, and having end plate rivet insertion holes provided so as to extend in the axial direction and arranged so as to be spaced apart at intervals in the circumferential direction; and a plurality of rivets inserted in communication with the first rivet insertion holes, the second rivet insertion holes, the first end plate rivet insertion holes or the second end plate rivet insertion holes, and the end plate rivet insertion holes. A first outer diameter section forming the outer circumference of the first rotor iron core electromagnetic steel plates is positioned more radially outward than a second outer diameter section forming the outer circumference of the second rotor iron core electromagnetic steel plates, and the second outer diameter section is positioned more radially inward than the magnet insertion holes and more radially outward than the first rivet insertion holes.

Description

Technical Field

[0001] The present disclosure relates to a rotor of an electric motor, an electric motor, a compressor, and a refrigeration cycle device.

Background Art

[0002] As a general rotor for a compressor, there is one including a laminated core body formed by laminating a plurality of disk-shaped axially perforated plates, a permanent magnet attached to the laminated core body, and end plates formed of disk-shaped iron plates covering both axial ends of the permanent magnet (see, for example, Patent Document 1).

[0003] Further, the rotor described in Patent Document 1 further includes a rivet for caulking and fixing the laminated core body and the end plate, and a balancer provided on the side opposite to the laminated core body side of one end plate and fixed together with the rivet.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the rotor described in Patent Document 1 above, by shrink-fitting the laminated core body onto the rotating shaft of the compressor, reliability against load torque during compressor operation and reliability against the total weight of the compressor are ensured.

[0006] On the other hand, in recent years, the performance of electric motors has been improving. Therefore, when redirecting the surplus generated by the performance improvement of the electric motor to "cost reduction", for example, reducing the stacking thickness of the laminated core body or reducing the outer diameter of the rotating shaft for mechanical loss reduction of the compressor can be mentioned.

[0007] However, in the rotor described in Patent Document 1 above, when the stack thickness of the core laminate is reduced or the outer diameter of the rotating shaft is decreased, inevitably, the reliability due to shrink fitting between the core laminate and the rotating shaft may decrease.

[0008] On the other hand, without changing the size of the magnet, it is conceivable to increase the shrink-fitted portion between the core laminate and the rotating shaft by increasing only the stack thickness of the core laminate. However, when there is a difference between the axial length of the magnet and the axial length of the core laminate, there is a problem that leakage magnetic flux is generated and the magnetic force decreases.

[0009] The present disclosure has been made to solve such problems, and an object thereof is to provide a rotor of an electric motor, an electric motor, a compressor, and a refrigeration cycle device capable of ensuring the reliability due to shrink fitting between the rotor and the rotating shaft without decreasing the magnetic force.

Means for Solving the Problems

[0010] The rotor of the motor according to the present disclosure has a first inner diameter portion fastened to the rotating shaft, a first rivet insertion hole extending in the axial direction of the rotating shaft and arranged at intervals in the circumferential direction, and a magnet insertion hole extending in the axial direction. It has an annular electromagnetic steel sheet for the first rotor core, which is arranged in a plurality of layers in the axial direction, a magnet inserted into the magnet insertion hole, a second inner diameter portion fastened to the rotating shaft, and a second inner diameter portion extending in the axial direction. It has a second rivet insertion hole arranged at intervals in the circumferential direction, and an annular electromagnetic steel sheet for the second rotor core, which is arranged in a plurality of layers in the axial direction. It is arranged between the electromagnetic steel sheet for the first rotor core and the electromagnetic steel sheet for the second rotor core in the axial direction, and has a third inner diameter portion fastened to the rotating shaft and a third outer diameter portion located radially inward of the first rivet insertion hole. An annular electromagnetic steel sheet for the third rotor core, which is arranged on the outer periphery of the third outer diameter portion, is made of a non-magnetic material, is arranged at one end in the axial direction of the magnet insertion hole, has an annular shape, and extends in the axial direction. A first end plate rivet insertion hole arranged at intervals in the circumferential direction of the annular semi-annular portion, and a second end plate rivet insertion hole arranged at intervals in the circumferential direction of the remaining semi-annular portion of the annular shape corresponding to the first end plate rivet insertion hole and extending in the axial direction. A first end plate portion having a first end plate rivet insertion hole, a second end plate portion made of a non-magnetic material, arranged at the other end in the axial direction of the magnet insertion hole, having an annular shape, and extending in the axial direction and having end plate rivet insertion holes arranged at intervals in the circumferential direction. A plurality of rivets inserted in communication with the first rivet insertion hole, the second rivet insertion hole, the first end plate rivet insertion hole or the second end plate rivet insertion hole, and the end plate rivet insertion hole. The first outer diameter portion forming the outer periphery of the electromagnetic steel sheet for the first rotor core is located radially outward of the second outer diameter portion forming the outer periphery of the electromagnetic steel sheet for the second rotor core, and the second outer diameter portion is located radially inward of the magnet insertion hole and radially outward of the first rivet insertion hole.

[0011] The motor according to the present disclosure includes the above-described rotor of the motor and a stator provided on the outer periphery of the rotor and rotating the rotor by a magnetic action.

[0012] The compressor according to the present disclosure includes the above-described electric motor, a compression mechanism unit that is driven by the electric motor and compresses a fluid sucked from the outside, and a hermetic container that houses the electric motor and the compression mechanism unit. It is provided with the following.

[0013] The refrigeration cycle device according to the present disclosure includes the above-described compressor, an outdoor heat exchanger, an expander, and an indoor heat exchanger.

Advantages of the Invention

[0014] For the rotor of the electric motor, the electric motor, the compressor, and the refrigeration cycle device according to the present disclosure, by fastening the first to third electromagnetic steel sheets for the rotor core to the rotating shaft, the reliability due to shrink fitting between the rotor and the rotating shaft is ensured, and both axial ends of the magnet inserted into the magnet insertion hole of the first electromagnetic steel sheet for the rotor core are covered with the first and second end plate portions made of a non-magnetic material, thereby suppressing the generation of leakage magnetic flux and suppressing the decrease in magnetic force.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of a rotor of an electric motor, the electric motor, a compressor, and a refrigeration cycle apparatus according to the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments, and various modifications can be made without departing from the gist of the present disclosure. Further, the present disclosure includes all possible combinations of the configurations shown in the following embodiments and their modifications. In addition, in each figure, those denoted by the same reference numerals are the same or corresponding to each other, which is common throughout the entire specification. Note that in each drawing, the relative dimensional relationships or shapes of the respective constituent members may be different from the actual ones.

[0017] Embodiment 1. <Hermetic compressor 130> First, with reference to FIG. 1, the overall configuration of the hermetic compressor 130 according to Embodiment 1 will be described. FIG. 1 is a cross-sectional view showing the configuration of the hermetic compressor 130 according to Embodiment 1. In Embodiment 1, a single-cylinder rotary compressor will be described as an example of the hermetic compressor 130.

[0018] The hermetic compressor 130 is a fluid machine that sucks a low-temperature and low-pressure refrigerant into the interior, compresses the sucked refrigerant, and discharges the high-temperature and high-pressure refrigerant to the outside. As shown in FIG. 1, the hermetic compressor 130 includes a hermetic container 101 that forms an outer shell, an electric motor 103 having a stator 1 and a rotor 5A, a rotating shaft 104 that transmits the driving force of the electric motor 103, and a compression mechanism portion 102 that compresses the refrigerant by the driving force transmitted from the rotating shaft 104. The rotating shaft 104 may be called a crankshaft.

[0019] The sealed container 101 is composed of an upper container 101a and a lower container 101b. The upper container 101a has a bottomed cylindrical shape with an open bottom surface or a deformed dome shape. The lower container 101b has a bottomed cylindrical shape with an open top surface. The upper container 101a is disposed on the open top surface of the lower container 101b and seals the top surface. Note that the sealed container 101 is not limited to being formed from two constituent members, the upper container 101a and the lower container 101b, and may be formed from three or more constituent members.

[0020] Inside the sealed container 101, a motor 103, a rotating shaft 104, and a compression mechanism portion 102 are accommodated. The motor 103 is accommodated above the interior of the sealed container 101. The compression mechanism portion 102 is accommodated below the interior of the sealed container 101. The compression mechanism portion 102 and the motor 103 are connected via the rotating shaft 104.

[0021] The rotating shaft 104 has a main shaft portion 104a fixed to the rotor 5A of the motor 103, a sub-shaft portion 104b provided on the opposite side of the main shaft portion 104a across the compression mechanism portion 102, and an eccentric shaft portion 104c provided between the main shaft portion 104a and the sub-shaft portion 104b. The rotating shaft 104 is formed in the order of the main shaft portion 104a, the eccentric shaft portion 104c, and the sub-shaft portion 104b from above to below in the axial direction of the sealed container 101. The main shaft portion 104a is fitted into the central portion of the rotor 5A of the motor 103 and fixed by shrink fitting. The central axis of the eccentric shaft portion 104c is eccentric with respect to the central axes of the main shaft portion 104a and the sub-shaft portion 104b.

[0022] The compression mechanism portion 102 compresses the low-pressure gas refrigerant inhaled from the suction connection pipe 128 into the low-pressure space of the sealed container 101 into a high-pressure gas refrigerant by the rotational driving force supplied from the motor 103. The high-pressure gas refrigerant compressed by the compression mechanism portion 102 is discharged into the interior of the sealed container 101 from above the compression mechanism portion 102. As shown in FIG. 1, the compression mechanism portion 102 includes a cylinder 105, a main bearing 106, a sub-bearing 107, and a rolling piston 109.

[0023] The cylinder 105 is fixed to the sealed container 101 at its outer periphery by bolts or the like. The cylinder 105 has a hollow cylindrical shape, and the hollow interior forms a cylinder chamber 105a. As shown in FIG. 1, both axial ends of the rotation axis 104 are open in the cylinder chamber 105a, and are closed by a main bearing 106 provided on the upper surface of the cylinder 105 and a sub-bearing 107 provided on the lower surface of the cylinder 105. That is, the cylinder chamber 105a is a space surrounded by the inner peripheral surface of the cylinder 105, the inner wall surface of the main bearing 106, and the inner wall surface of the sub-bearing 107.

[0024] Further, the cylinder 105 is formed with a vane groove (not shown) that communicates with the cylinder chamber 105a and extends in the radial direction centered on the rotation axis 104. A vane (not shown) that partitions the cylinder chamber 105a into a suction chamber and a compression chamber is slidably fitted into the vane groove. The suction chamber is a low-pressure space and communicates with the suction connection pipe 128. The compression chamber is a high-pressure space and communicates with a discharge port (not shown) that discharges the refrigerant to the outside of the cylinder chamber 105a. Thus, in the compression mechanism portion 102, one end of the vane that reciprocates in the radial direction inside the vane groove provided in the cylinder 105 forms the compression chamber of the cylinder chamber 105a while contacting the outer periphery of the rolling piston 109.

[0025] The rolling piston 109 is formed in a hollow cylindrical shape, and an eccentric shaft portion 104c of the rotation axis 104 is slidably fitted into the hollow interior. The rolling piston 109 is housed in the cylinder chamber 105a together with the eccentric shaft portion 104c. When the rotation axis 104 rotates by the drive of the electric motor 103, the rolling piston 109 rotates along the inner peripheral surface of the cylinder chamber 105a to compress the refrigerant.

[0026] As shown in FIG. 1, the auxiliary bearing 107 is formed in a substantially T-shape in side view. The auxiliary bearing 107 is provided on the other end face of the cylinder 105 on the side opposite to the side where the electric motor 103 is disposed, and closes the axially lower opening of the cylinder chamber 105a. Further, the auxiliary bearing 107 is fitted to the auxiliary shaft portion 104b of the rotating shaft 104 and rotatably supports the auxiliary shaft portion 104b.

[0027] Next, the electric motor 103 will be described. The electric motor 103 includes a stator 1 and a rotor 5A. As the electric motor 103, for example, a brushless DC motor is used. The electric motor 103 uses electric power supplied from an external power source to generate a rotational driving force on the rotating shaft 104, and transmits the rotational driving force to the compression mechanism portion 102 via the rotating shaft 104.

[0028] The stator 1 has a cylindrical shape. The stator 1 has a donut shape in plan view. The stator 1 is fixed to the inner wall surface of the lower container 101b of the sealed container 101. The outer diameter of the stator 1 is larger than the inner diameter of the lower container 101b. The stator 1 is shrink-fitted and fixed in the lower container 101b. The stator 1 is configured by laminating a plurality of electromagnetic steel sheets for stator cores formed by punching a thin plate electromagnetic steel sheet. The electromagnetic steel sheet for stator core may be called a stator core sheet.

[0029] As shown in FIG. 1, a coil 4 composed of windings is wound around the teeth of the stator 1. Further, the coil 4 is provided with an insulating member 3 for insulating the coil 4 from the outside. Further, the stator 1 is provided with a lead wire 9 for supplying electric power from the outside of the sealed container 101. The lead wire 9 of the stator 1 is connected to a glass terminal 119 provided on the upper container 101a. The glass terminal 119 is disposed on the upper part of the upper container 101a of the sealed container 101. The outer diameter of the stator 1 is larger than the inner diameter of the lower container 101b. The stator 1 is shrink-fitted and fixed in the lower container 101b.

[0030] The rotor 5A is disposed inside the stator 1. The rotor 5A is provided rotatably facing the inner surface of the stator 1 and rotates by magnetic action. The rotor 5A has a cylindrical shape. A rotating shaft 104 is fitted into the central portion of the rotor 5A. Similar to the stator 1, the rotor 5A is composed of a plurality of laminated electromagnetic steel sheets for rotor cores formed by punching thin plate electromagnetic steel sheets. The electromagnetic steel sheets for rotor cores are sometimes called rotor core sheets. The rotor 5A includes a rotor core 21, a balance weight 25, and a rivet 26.

[0031] The rotor core 21 is attached to the rotating shaft 104. When the electric motor 103 rotationally drives the rotating shaft 104, the rotor core 21 of the rotor 5A rotates. The inner diameter of the rotor core 21 is smaller than the outer diameter of the rotating shaft 104, and the rotor core 21 is fixed to the main shaft portion 104a of the rotating shaft 104 by shrink fitting. The rotor core 21 has a magnet insertion hole 22 into which a permanent magnet is inserted and a rivet hole 23 into which a rivet 26 is inserted.

[0032] The balance weight 25 has an upper balance weight 25a and a lower balance weight 25b. The upper balance weight 25a and the lower balance weight 25b are respectively disposed at both axial ends of the rotor core 21. The upper balance weight 25a and the lower balance weight 25b function as balancers for reducing the vibration of the hermetic compressor 130. Also, the upper balance weight 25a and the lower balance weight 25b also serve to prevent the scattering of the magnet 24. The upper balance weight 25a is disposed at the upper end portion of the rotor core 21 in the hermetic compressor 130. The lower balance weight 25b is disposed at the lower end portion of the rotor core 21 in the hermetic compressor 130. The magnet 24 is, for example, a permanent magnet.

[0033] The rivet 26 fixes the upper balance weight 25a, the lower balance weight 25b, and the rotor core 21. The rivet 26 is inserted into the rivet hole 23 provided in the rotor core 21. The rivet 26 is a rod-shaped member and has, for example, a cylindrical shape.

[0034] Although not shown in FIG. 1, end plates for preventing the magnets 24 from scattering are provided at both axial ends of the rotor core 21. In FIG. 3 described later, the first non-magnetic end plate 305 and the second non-magnetic end plate 306 constitute the "end plates". Note that the balance weight 25 and the "end plates" may be configured as the same component, or may be configured as separate components. In FIG. 3 described later, the fourth group 311 constitutes the balance weight 25. Therefore, in FIG. 3 described later, a case where the balance weight 25 and the "end plates" are configured as separate components is shown.

[0035] An accumulator (not shown) for storing the liquid refrigerant and a suction muffler 127 having a role of muffling the refrigerant sound are provided adjacent to the sealed container 101. As shown in FIG. 1, the sealed container 101 is connected to the suction muffler 127 via a suction connection pipe 128, and the gas refrigerant is taken into the sealed container 101 from the suction muffler 127. The suction muffler 127 is fixed to the outer surface of the sealed container 101 by welding or the like. The suction muffler 127 is connected to the cylinder 105 of the compression mechanism portion 102 via the suction connection pipe 128. The suction muffler 127 separates the low-temperature and low-pressure refrigerant sent from the refrigeration circuit into a liquid refrigerant and a gas refrigerant, prevents the liquid refrigerant from being sucked into the compression mechanism portion 102 as much as possible, and is provided for storing the separated liquid refrigerant. This is because if the liquid refrigerant flows into the compression mechanism portion 102 of the hermetic compressor 130 and is compressed, it will cause a failure of the compression mechanism portion 102. Further, the suction muffler 127 also has a function as a silencer for reducing or removing the noise generated by the flowing refrigerant.

[0036] At the upper part of the upper container 101a of the sealed container 101, as shown in FIG. 1, a discharge pipe 129 is connected. The discharge pipe 129 is a refrigerant pipe that discharges high-pressure gas refrigerant to the outside of the sealed container 101. The discharge pipe 129 penetrates the upper container 101a and is joined to the upper container 101a by, for example, brazing or resistance welding. The refrigerant gas compressed by the cylinder 105 is discharged into the sealed container 101, passes through the electric motor 103, and is sent from the discharge pipe 129 to a four-way switching valve 133 of a refrigeration cycle device 200 described later.

[0037] Here, as an example of the hermetic compressor 130, a single rotary compressor is shown, but it is not limited thereto. The hermetic compressor 130 may be, for example, a rotary compressor having a plurality of cylinders 105 such as a twin rotary compressor having two cylinders 105, or other structures. That is, the hermetic compressor 130 may be any compressor as long as it is a hermetic compressor in which the electric motor 103 is disposed in the sealed container 101, such as a scroll compressor or a reciprocating compressor, and its compression structure is not limited.

[0038] <Refrigeration cycle device 200> FIG. 2 is a schematic configuration diagram showing the configuration of a refrigeration cycle device 200 in which a hermetic compressor 130 according to Embodiment 1 is mounted. The refrigeration cycle device 200 is, for example, an air conditioner or the like. As shown in FIG. 2, the refrigeration cycle device 200 includes a hermetic compressor 130, a four-way switching valve 133, an outdoor heat exchanger 134, an expander 135, and an indoor heat exchanger 136, and is configured by sequentially connecting them via pipes to form a refrigerant circuit. The suction muffler 127 is connected to the suction side of the hermetic compressor 130. Further, the four-way switching valve 133 is connected to the discharge side of the hermetic compressor 130 and switches the flow of the refrigerant discharged from the hermetic compressor 130. Generally, in an air conditioner, the indoor heat exchanger 136 is mounted on an indoor device, and the hermetic compressor 130, the four-way switching valve 133, the outdoor heat exchanger 134, and the expander 135 are mounted on an outdoor device. Note that the outdoor heat exchanger 134 and the indoor heat exchanger 136 are, for example, fin-and-tube type heat exchangers including fins and heat transfer tubes. Further, the expander 135 is an expansion valve such as an electronic expansion valve or a capillary tube.

[0039] Hereinafter, the operation of the refrigeration cycle device 200 will be described by taking the case where the refrigeration cycle device 200 is an air conditioner as an example.

[0040] When the air conditioner is in heating operation, the four-way switching valve 133 is connected to the solid line side in FIG. 3. The high-temperature and high-pressure refrigerant compressed by the hermetic compressor 130 flows into the indoor heat exchanger 136. In the indoor heat exchanger 136, the refrigerant is condensed and liquefied. Then, the liquefied refrigerant flows into the decompressor 135. The flowing-in refrigerant is throttled by the decompressor 135 to become a low-temperature and low-pressure gas-liquid two-phase state and flows into the outdoor heat exchanger 134. In the outdoor heat exchanger 134, the refrigerant evaporates and gasifies. The gasified refrigerant returns to the hermetic compressor 130 again through the four-way switching valve 133 and the suction muffler 127. That is, as shown by the solid line arrow in FIG. 3, the refrigerant circulates. By this circulation, in the outdoor heat exchanger 134 which is an evaporator, heat exchange is performed with the outside air, the refrigerant sent to the outdoor heat exchanger 134 absorbs heat, and the heat-absorbed refrigerant is sent to the indoor heat exchanger 136 which is a condenser, performs heat exchange with the indoor air, and warms the indoor air.

[0041] When the air conditioner is in cooling operation, the four-way switching valve 133 is connected to the broken line side in FIG. 3. The high-temperature and high-pressure refrigerant compressed by the hermetic compressor 130 flows into the outdoor heat exchanger 134. In the outdoor heat exchanger 134, the refrigerant is condensed and liquefied. Then, the liquefied refrigerant flows into the decompressor 135. The flowing-in refrigerant is throttled by the decompressor 135 to become a low-temperature and low-pressure gas-liquid two-phase state and flows into the indoor heat exchanger 136. In the indoor heat exchanger 136, the refrigerant evaporates and gasifies. The gasified refrigerant returns to the hermetic compressor 130 again through the four-way switching valve 133 and the suction muffler 127. That is, when changing from heating operation to cooling operation, the indoor heat exchanger 136 changes from a condenser to an evaporator, and the outdoor heat exchanger 134 changes from an evaporator to a condenser. Therefore, as shown by the broken line arrow in FIG. 3, the refrigerant circulates. By this circulation, in the indoor heat exchanger 136 which is an evaporator, heat exchange is performed with the indoor air, absorbs heat from the indoor air, that is, cools the indoor air, and the heat-absorbed refrigerant is sent to the outdoor heat exchanger 134 which is a condenser, performs heat exchange with the outside air, and dissipates heat to the outside air.

[0042] At this time, generally, R407C refrigerant, R410A refrigerant, or R32 refrigerant, etc. are used as the refrigerant.

[0043] <Rotor 5A of the electric motor 103> Next, with reference to FIG. 3, the details of the configuration of the rotor 5A of the electric motor 103 according to Embodiment 1 shown in FIG. 1 will be described. FIG. 3 is a (a) plan view seen from above, (b) longitudinal sectional view, and (c) plan view seen from below showing the configuration of the rotor 5A of the electric motor 103 according to Embodiment 1. In FIG. 3(b), the A-A sectional view of FIG. 3(a) is shown. In FIG. 1, for simplicity of the figure, the rotor 5A is schematically drawn, but actually, the rotor 5A has the configuration shown in FIG. 3.

[0044] In a general motor rotor for a compressor, the gripping force by shrink fitting acting between the main shaft portion of the rotating shaft ensures the reliability against the rotational movement and self-weight during compressor operation. However, the gripping force by shrink fitting has a proportional relationship with the contact area of the shrink-fitted portion. When reducing the stack thickness of the rotor core or reducing the outer diameter of the rotating shaft, the reliability of the shrink fitting between the rotor and the rotating shaft may decrease. In contrast, it is conceivable to increase only the stack thickness of the core laminate and increase the shrink-fitted portion without changing the shape and size of the magnet. However, when there is a difference between the axial length of the magnet and the stack thickness direction length of the magnet insertion hole of the core laminate, as described above, there is a problem that leakage magnetic flux is generated and the magnetic force decreases.

[0045] Therefore, in Embodiment 1, the rotor 5A that can improve the shrink fitting stress between the rotor 5A and the rotating shaft 104 without suppressing the generation of leakage magnetic flux and reducing the magnetic force will be described.

[0046] As shown in FIG. 3, the rotor 5A includes a fourth group 311, a third group 310, a second group 309, a first group 308, a second group 309, a third group 310, a fourth group 311, and a rivet 26 (see FIG. 1). In the rotor 5A, in the axial direction of the rotating shaft 104, the fourth group 311, the third group 310, the second group 309, the first group 308, the second group 309, the third group 310, and the fourth group 311 are arranged in this order from above.

[0047] <First group 308> The first group 308 shown in FIG. 3 is formed by laminating a plurality of electromagnetic steel sheets 301 for the first rotor core shown in FIG. 4 in the axial direction. FIG. 4 is a plan view showing the configuration of the electromagnetic steel sheet 301 for the first rotor core provided in the rotor 5A of the motor 103 according to the first embodiment. In FIG. 4, the state of the electromagnetic steel sheet 301 for the first rotor core as viewed from above is shown.

[0048] As shown in FIG. 4, the electromagnetic steel sheet 301 for the first rotor core is a plate-shaped member having an annular shape in plan view. The electromagnetic steel sheet 301 for the first rotor core has a first inner diameter portion 3011 that can be fastened to the rotating shaft 104 by shrink fitting, a first caulking portion 3012 for lamination, a first rivet insertion hole 3013, a magnet insertion hole 3014, and a first outer diameter portion 3015.

[0049] The first inner diameter portion 3011 is a through hole into which the rotating shaft 104 is fitted. The first inner diameter portion 3011 has a circular shape in plan view. The first inner diameter portion 3011 is disposed at the center of the electromagnetic steel sheet 301 for the first rotor core. The center of the first inner diameter portion 3011 coincides with the axis of the rotating shaft 104. The rotating shaft 104 is inserted into and fastened to the first inner diameter portion 3011.

[0050] A plurality of first caulking portions 3012 for lamination are arranged at intervals in the circumferential direction along the outer periphery of the first inner diameter portion 3011. The first caulking portions 3012 for lamination are located on the radially outer side of the first inner diameter portion 3011. The first caulking portions 3012 for lamination have, for example, a rectangular shape in plan view. The plurality of electromagnetic steel sheets 301 for the first rotor core are fastened and positioned by the first caulking portions 3012 for lamination.

[0051] The first rivet insertion hole 3013 is a through hole into which the rivet 26 is inserted. The first rivet insertion hole 3013 has a circular shape in a plan view. A plurality of first rivet insertion holes 3013 are arranged at intervals in the circumferential direction along the outer periphery of the first inner diameter portion 3011. The first rivet insertion hole 3013 is located on the radially outer side of the first caulking portion 3012 for lamination. Also, the first rivet insertion hole 3013 is arranged between two adjacent first caulking portions 3012 for lamination in the circumferential direction.

[0052] The magnet insertion hole 3014 is a through hole into which the magnet 24 is inserted. The magnet insertion hole 3014 has, for example, a rectangular shape in a plan view. A plurality of magnet insertion holes 3014 are arranged at intervals in the circumferential direction along the outer periphery of the first outer diameter portion 3015. The magnet insertion hole 3014 is located on the radially outer side of the first rivet insertion hole 3013 and on the radially inner side of the first outer diameter portion 3015. The longitudinal side of the magnet insertion hole 3014 extends in a direction intersecting the radial direction of the first rotor core electromagnetic steel sheet 301.

[0053] The first rotor core electromagnetic steel sheet 301 is configured such that the distance from the axis of the rotation shaft 104 toward the radially outer side has the relationship of "first inner diameter portion 3011 < first caulking portion 3012 for lamination < first rivet insertion hole 3013 < magnet insertion hole 3014 < first outer diameter portion 3015".

[0054] Here, the "distance from the axis of the rotation shaft 104 toward the radially outer side" is the distance between the position closest to the axis of the rotation shaft 104 of each part and the axis of the rotation shaft 104. Therefore, in the case of the first rivet insertion hole 3013, it is the distance L1 between the position of the outer diameter portion closest to the axis of the rotation shaft 104 of the first rivet insertion hole 3013 and the axis of the rotation shaft 104. Also, in the case of the magnet insertion hole 3014, it is the distance L2 between the position of one side closest to the axis of the rotation shaft 104 of the magnet insertion hole 3014 and the axis of the rotation shaft 104.

[0055] <Second group 309> Using FIGS. 6, 8, and 9, the configuration of the second group 309 shown in FIG. 3 will be described. FIG. 6 is a plan view showing the configuration of the electromagnetic steel sheet 303 for the third rotor core provided on the rotor 5A of the electric motor 103 according to the first embodiment. In FIG. 6, the state of the electromagnetic steel sheet 303 for the third rotor core as viewed from above is shown. FIG. 8 is a plan view showing the configuration of the first non-magnetic end plate 305 provided on the rotor 5A of the electric motor 103 according to the first embodiment. In FIG. 8, the state of the first non-magnetic end plate 305 as viewed from above is shown. FIG. 9 is a plan view showing the configuration of the second non-magnetic end plate 306 provided on the rotor 5A of the electric motor 103 according to the first embodiment. In FIG. 9, the state of the second non-magnetic end plate 306 as viewed from above is shown.

[0056] The second group 309 shown in FIG. 3 is composed of the first non-magnetic end plate 305 shown in FIG. 8, the second non-magnetic end plate 306 shown in FIG. 9, and the electromagnetic steel sheet 303 for the third rotor core shown in FIG. 6.

[0057] As shown in FIG. 6, the electromagnetic steel sheet 303 for the third rotor core is a plate-like member having an annular shape in plan view. The electromagnetic steel sheet 303 for the third rotor core has a third inner diameter portion 3031 that can be fastened to the rotary shaft 104 by shrink fitting, a third caulking portion 3032 for lamination, and a third outer diameter portion 3035. The third inner diameter portion 3031 has the rotary shaft 104 inserted and fastened therein. The third outer diameter portion 3035 is located on the radially inner side of the position of the first rivet insertion hole 3013 (see FIG. 4) and on the radially outer side of the first caulking portion 3012 for lamination (see FIG. 4). A plurality of the third caulking portions 3032 for lamination are arranged along the outer periphery of the third inner diameter portion 3031 at intervals in the circumferential direction. The third caulking portions 3032 for lamination have, for example, a rectangular shape in plan view. The third caulking portions 3032 for lamination are located on the radially outer side of the third inner diameter portion 3031. The position of the third caulking portions 3032 for lamination coincides with the position of the first caulking portions 3012 for lamination.

[0058] The electromagnetic steel sheet 303 for the third rotor core is configured such that the distance from the axis of the rotating shaft 104 toward the radially outer side is in the relationship of "third inner diameter portion 3031 < third caulking portion 3032 for lamination < third outer diameter portion 3035".

[0059] As shown in FIG. 8, the first non-magnetic end plate 305 is a plate-shaped member having a semi-annular shape in plan view. The first non-magnetic end plate 305 is made of a non-magnetic material. A non-magnetic material is a substance that is not affected by a magnetic field and is not magnetized. The first non-magnetic end plate 305 has an arcuate first end plate inner diameter portion 3051 that abuts against the third outer diameter portion 3035 of the electromagnetic steel sheet 303 for the third rotor core, a first end plate rivet insertion hole 3053, an arcuate first end plate outer diameter portion 3055, and a linear connecting portion 3056. The first end plate rivet insertion hole 3053 is a circular through-hole into which the rivet 26 is inserted. A plurality of the first end plate rivet insertion holes 3053 are arranged at intervals in the circumferential direction along the first end plate inner diameter portion 3051 of the semi-annular first non-magnetic end plate 305. The first end plate rivet insertion hole 3053 is located on the radially outer side of the first end plate inner diameter portion 3051. The position of the first end plate rivet insertion hole 3053 coincides with the position of the first rivet insertion hole 3013. The first end plate outer diameter portion 3055 is located on the radially outer side of the magnet insertion hole 3014 (see FIG. 4). The connecting portion 3056 is disposed adjacent to the first end plate inner diameter portion 3051 and the first end plate outer diameter portion 3055 and connects the first end plate inner diameter portion 3051 and the first end plate outer diameter portion 3055.

[0060] As shown in Fig. 9, the second non-magnetic end plate 306 is a plate-shaped member having a semi-annular shape in plan view. The second non-magnetic end plate 306 is made of a non-magnetic material. The second non-magnetic end plate 306 has an arcuate second end plate inner diameter portion 3061 that abuts against the third outer diameter portion 3035 of the electromagnetic steel sheet 303 for the third rotor core, a second end plate rivet insertion hole 3063, and an arcuate second end plate outer diameter portion 3065. The second end plate rivet insertion hole 3063 is a circular through hole into which the rivet 26 is inserted. A plurality of second end plate rivet insertion holes 3063 are arranged at intervals in the circumferential direction along the second end plate inner diameter portion 3061 of the semi-annular second non-magnetic end plate 306. The second end plate rivet insertion hole 3063 is located on the radially outer side of the second end plate inner diameter portion 3061. The position of the second end plate rivet insertion hole 3063 coincides with the position of the first rivet insertion hole 3013 (see Fig. 4). The second end plate outer diameter portion 3065 is located on the radially outer side of the magnet insertion hole 3014 (see Fig. 4). The connecting portion 3066 is disposed adjacent to the second end plate inner diameter portion 3061 and the second end plate outer diameter portion 3065, and connects the second end plate inner diameter portion 3061 and the second end plate outer diameter portion 3065.

[0061] The first non-magnetic end plate 305 and the second non-magnetic end plate 306 are configured to form an annular shape by being arranged opposite to each other such that the connecting portion 3056 and the connecting portion 3066 abut against each other. When the first non-magnetic end plate 305 and the second non-magnetic end plate 306 are arranged opposite to each other, the first end plate inner diameter portion 3051 and the second end plate inner diameter portion 3061 form a circular inner diameter portion. The electromagnetic steel sheet 303 for the third rotor core is disposed inside the inner diameter portion. At this time, the third outer diameter portion 3035 of the electromagnetic steel sheet 303 for the third rotor core abuts against the first end plate inner diameter portion 3051 and the second end plate inner diameter portion 3061. Further, the second end plate rivet insertion holes 3063 are arranged at intervals in the circumferential direction corresponding to the positions of the first end plate rivet insertion holes 3053. Therefore, when the first non-magnetic end plate 305 and the second non-magnetic end plate 306 are arranged opposite to each other, the second end plate rivet insertion holes 3063 and the first end plate rivet insertion holes 3053 are arranged at positions that are line-symmetric with the connecting portion 3056 and the connecting portion 3066 as the axis of symmetry.

[0062] As shown in FIG. 3, the magnet 24 is inserted into a magnet insertion hole 3014 provided in the electromagnetic steel sheet 301 for the first rotor core of the first group 308. Since the electromagnetic steel sheets 301 for the first rotor core are laminated in the axial direction, when viewed from the entire first group 308, the magnet insertion holes 3014 extend in the axial direction as shown in FIG. 3. The first non-magnetic end plates 305 are disposed at the upper and lower ends of the magnet insertion holes 3014 extending in the axial direction. Similarly, the second non-magnetic end plates 306 are disposed at the upper and lower ends of the magnet insertion holes 3014 extending in the axial direction. Hereinafter, the upper end in the axial direction of the first group 308 will be referred to as the "first end 308a", and the lower end in the axial direction of the first group 308 will be referred to as the "second end 308b". The first non-magnetic end plates 305 and the second non-magnetic end plates 306 are provided on both the first end 308a side and the second end 308b side of the first group 308. Further, as shown in FIG. 3, the outer diameter portions 3055 of the first end plates and the outer diameter portions 3065 of the second end plates are in the same radial position as the first outer diameter portion 3015.

[0063] In addition, the first non-magnetic end plates 305 and the second non-magnetic end plates 306 disposed on the "first end 308a" side of the first group 308 may be referred to as the "first end plate portion 401". That is, the first end plate portion 401 is disposed on the outer periphery of the third outer diameter portion 3035 of the electromagnetic steel sheet 303 for the third rotor core. Also, the first non-magnetic end plates 305 and the second non-magnetic end plates 306 disposed on the "second end 308b" side of the first group 308 may be referred to as the "second end plate portion 402". That is, the second end plate portion 402 is disposed on the outer periphery of the third outer diameter portion 3035 of the electromagnetic steel sheet 303 for the third rotor core. By disposing the "first end plate portion 401" and the "second end plate portion 402" at the upper and lower ends in the axial direction of the magnet 24, respectively, the generation of leakage magnetic flux can be suppressed.

[0064] Note that the first non-magnetic body end plate 305 may be a single sheet or a plurality of sheets may be laminated. Also, the second non-magnetic body end plate 306 may be a single sheet or a plurality of sheets may be laminated. Furthermore, the third electromagnetic steel sheet 303 for the rotor core may be a single sheet or a plurality of sheets may be laminated. However, the stacking thickness of the first non-magnetic body end plate 305, the stacking thickness of the second non-magnetic body end plate 306, and the stacking thickness of the third electromagnetic steel sheet 303 for the rotor core are all the same as shown in FIG. 3.

[0065] <Third group 310> The third group 310 shown in FIG. 3 is configured by laminating a plurality of second electromagnetic steel sheets 302 for the rotor core shown in FIG. 5. FIG. 5 is a plan view showing the configuration of the second electromagnetic steel sheet 302 for the rotor core provided in the rotor 5A of the motor 103 according to the first embodiment. In FIG. 5, the state of the second electromagnetic steel sheet 302 when viewed from above is shown.

[0066] As shown in FIG. 5, the second electromagnetic steel sheet 302 for the rotor core is a plate-like member having an annular shape in plan view. The second electromagnetic steel sheet 302 for the rotor core has a second inner diameter portion 3021 that can be fastened to the rotary shaft 104 by shrink fitting, a second caulking portion 3022 for lamination, a second rivet insertion hole 3023, and a second outer diameter portion 3025. The second outer diameter portion 3025 is located on the radially inner side of the magnet insertion hole 3014 (see FIG. 4) and on the radially outer side of the first rivet insertion hole 3013 (see FIG. 4). Therefore, as shown in FIG. 3, the second electromagnetic steel sheet 302 for the rotor core is not provided above and below the magnet 24 in the axial direction. Thus, in the first embodiment, no electromagnetic steel sheet other than the first group 308 is provided near the magnet 24. Therefore, further generation of leakage magnets can be suppressed.

[0067] The second inner diameter portion 3021 is a through hole into which the rotary shaft 104 is fitted. The second inner diameter portion 3021 has a circular shape in plan view. The second inner diameter portion 3021 is disposed at the center of the second electromagnetic steel sheet 302 for the rotor core. The center of the second inner diameter portion 3021 coincides with the axis of the rotary shaft 104. The rotary shaft 104 is inserted into and fastened to the second inner diameter portion 3021.

[0068] The caulking parts 3022 for the second lamination are arranged in a plurality along the outer circumference of the second inner diameter part 3021 at intervals in the circumferential direction. The caulking parts 3022 for the second lamination have, for example, a rectangular shape in plan view. The caulking parts 3022 for the second lamination are located on the radially outer side of the second inner diameter part 3021.

[0069] The second rivet insertion holes 3023 are through holes into which the rivets 26 are inserted. The second rivet insertion holes 3023 have a circular shape in plan view. The second rivet insertion holes 3023 are arranged in a plurality along the outer circumference of the second inner diameter part 3021 at intervals in the circumferential direction. However, the second rivet insertion holes 3023 are located on the radially outer side of the caulking parts 3022 for the second lamination. Also, the second rivet insertion holes 3023 are arranged between two caulking parts 3022 for the second lamination that are arranged adjacent to each other in the circumferential direction. The positions of the second rivet insertion holes 3023 coincide with the positions of the first rivet insertion holes 3013 (see FIG. 4). The positions of the caulking parts 3022 for the second lamination coincide with the positions of the caulking parts 3012 for the first lamination (see FIG. 4).

[0070] The electromagnetic steel sheet 302 for the second rotor core is configured such that the distance from the axis of the rotating shaft 104 toward the radially outer side is in the relationship of "second inner diameter part 3021 < caulking parts 3022 for the second lamination < second rivet insertion holes 3023 < second outer diameter part 3025".

[0071] <The fourth group 311> The fourth group 311 shown in FIG. 3 is configured by laminating a plurality of electromagnetic steel sheets 304 for the fourth rotor core shown in FIG. 7. FIG. 7 is a plan view showing the configuration of the electromagnetic steel sheet 304 for the fourth rotor core provided in the rotor 5A of the motor 103 according to Embodiment 1. In FIG. 7, the state of the electromagnetic steel sheet 304 for the fourth rotor core seen from above is shown.

[0072] As shown in Fig. 7, the electromagnetic steel sheet 304 for the fourth rotor core has a semi-annular shape in plan view. The electromagnetic steel sheet 304 for the fourth rotor core has an arcuate fourth inner diameter portion 3041, a fourth caulking portion 3042 for lamination, a third rivet insertion hole 3043, an arcuate fourth outer diameter portion 3045, and a straight portion 3047.

[0073] The fourth inner diameter portion 3041 is in contact with the rotating shaft 104. The fourth inner diameter portion 3041 is fastened to the rotating shaft 104.

[0074] The third rivet insertion hole 3043 is a circular through-hole into which the rivet 26 is inserted. A plurality of third rivet insertion holes 3043 are arranged at intervals in the circumferential direction along the fourth inner diameter portion 3041. The third rivet insertion hole 3043 is located on the radially outer side of the fourth inner diameter portion 3041. The position of the third rivet insertion hole 3043 coincides with the position of the first rivet insertion hole 3013 (see Fig. 4).

[0075] The fourth outer diameter portion 3045 is located on the radially inner side of the magnet insertion hole 3014 (see Fig. 4) and on the radially outer side of the first rivet insertion hole 3013 (see Fig. 4). The radial position of the fourth outer diameter portion 3045 coincides with the second outer diameter portion 3025 as shown in Fig. 3. Also, the straight portion 3047 is arranged adjacent to the fourth inner diameter portion 3041 and the fourth outer diameter portion 3045, and connects the fourth inner diameter portion 3041 and the fourth outer diameter portion 3045.

[0076] A plurality of fourth caulking portions 3042 for lamination are arranged at intervals in the circumferential direction along the outer circumference of the fourth inner diameter portion 3041. The fourth caulking portions 3042 for lamination have, for example, a rectangular shape in plan view. The fourth caulking portions 3042 for lamination are located on the radially outer side of the fourth inner diameter portion 3041. The position of the fourth caulking portions 3042 for lamination coincides with the position of the first caulking portions 3012 for lamination (see Fig. 4).

[0077] The electromagnetic steel sheet 304 for the fourth rotor core is configured such that the distance from the axis of the rotary shaft 104 toward the radially outer side is in the relationship of "fourth inner diameter portion 3041 < fourth caulking portion for lamination 3042 < third rivet insertion hole 3043 < fourth outer diameter portion 3045".

[0078] As shown in FIG. 3, the fourth group 311, the third group 310, the second group 309, the first group 308, the second group 309, the third group 310, and the fourth group 311 are fixed by the rivet 26. That is, the rivet 26 is inserted in sequence and communicated with the third rivet insertion hole 3043, the second rivet insertion hole 3023, the first end plate rivet insertion hole 3053 or the second end plate rivet insertion hole 3063, the first rivet insertion hole 3013, the first end plate rivet insertion hole 3053 or the second end plate rivet insertion hole 3063, the second rivet insertion hole 3023, and the third rivet insertion hole 3043. Thereby, the fourth group 311, the third group 310, the second group 309, the first group 308, the second group 309, the third group 310, and the fourth group 311 are fixed.

[0079] Furthermore, the fourth group 311, the third group 310, the second group 309, the first group 308, the second group 309, the third group 310, and the fourth group 311 are fixed by the caulking portions for lamination. That is, the fourth group 311, the third group 310, the second group 309, the first group 308, the second group 309, the third group 310, and the fourth group 311 are positioned and fastened to each other by the first caulking portion for lamination 3012, the second caulking portion for lamination 3022, the third caulking portion for lamination 3032, and the fourth caulking portion for lamination 3042. The fourth group 311, the third group 310, the second group 309, the first group 308, the second group 309, the third group 310, and the fourth group 311 are pressed, for example, by the same iron core press die and positioned and fastened by the caulking portions for lamination. Therefore, high precision required for the product can be easily ensured for the inner diameter dimensions and the outer diameter dimensions of the fourth group 311, the third group 310, the second group 309, and the first group 308, respectively.

[0080] As shown in FIG. 3, the magnet 24 is inserted into the magnet insertion holes 3014 of the first group 308. The magnet insertion holes 3014 of the first group 308 extend in the axial direction. The magnet 24 has a rectangular shape in a plan view. The magnet 24 has a flat plate shape. At both axial ends of the magnet 24 arranged on the left side of FIG. 3, the first non-magnetic end plates 305 are arranged. Also, at both axial ends of the magnet 24 arranged on the right side of FIG. 3, the second non-magnetic end plates 306 are arranged. Thus, end plates made of a non-magnetic material are arranged at both axial ends of the magnet 24. Therefore, no electromagnetic steel plate, which is a magnetic material, is arranged in the vicinity of the magnet 24 within the first group 308. As a result, the magnetic flux generated by the magnet 24 can flow into the stator 1 without generating leakage magnetic flux due to the second group 309 and the third group 310, and it is possible to suppress a decrease in magnetic force compared to the conventional case.

[0081] Also, as shown in FIG. 3, at both axial ends of the first group 308 composed of the first rotor core electromagnetic steel plates 301, that is, at the upper and lower ends, the third group 310 composed of the second rotor core electromagnetic steel plates 302 is arranged. Further, between the first rotor core electromagnetic steel plates 301 and the second rotor core electromagnetic steel plates 302, the third rotor core electromagnetic steel plates 303 are arranged. The third rotor core electromagnetic steel plates 303 connect the first rotor core electromagnetic steel plates 301 and the second rotor core electromagnetic steel plates 302. In FIG. 3, for the sake of clarity, it is illustrated that there is a gap between the second group 309 and the third group 310, but actually, there is no gap between the second group 309 and the third group 310, and the second group 309 and the third group 310 are in contact with each other.

[0082] In Embodiment 1, in this way, by arranging the electromagnetic steel sheet 301 for the first rotor core, the electromagnetic steel sheet 303 for the third rotor core of the second group 309, and the electromagnetic steel sheet 302 for the second rotor core of the third group 310, the inner diameter portion area of the entire rotor 5A increases. The rotor 5A ensures reliability against rotational movement and its own weight during the operation of the hermetic compressor 130 by the gripping force due to shrink fitting acting between the rotor 5A and the rotating shaft 104. The gripping force due to shrink fitting has a proportional relationship with the inner diameter portion area of the entire rotor 5A. In Embodiment 1, by increasing the inner diameter portion area of the entire rotor 5A, it is possible to improve the gripping force during shrink fitting. Further, the electromagnetic steel sheets 301, 302, and 303 for the first to third rotor cores are pressed by the same core press die and fastened and positioned by the first to third caulking portions 3012, 3022, and 3032 for lamination, so that the necessary accuracy of the inner and outer diameter dimensions can be ensured.

[0083] In a conventional general rotor, the rotor core is constituted only by a portion corresponding to the first group 308 in Embodiment 1. Therefore, the rotor and the rotating shaft are fastened only by a portion corresponding to the first group 308 in Embodiment 1. Therefore, the inner diameter portion area of a conventional general rotor is smaller than the inner diameter portion area in Embodiment 1. Since the gripping force due to shrink fitting has a proportional relationship with the inner diameter portion area, a conventional general rotor has a smaller gripping force due to shrink fitting than in Embodiment 1. In Embodiment 1, the second group 309, the third group 310, and the fourth group 311 are added to the first group 308. And in Embodiment 1, the first group 308, the second group 309, the third group 310, and the fourth group 311 are fastened to the rotating shaft 104. Therefore, compared with a conventional general rotor, the inner diameter portion area of the rotor has increased significantly. As a result, the gripping force due to shrink fitting can be improved significantly.

[0084] In Embodiment 1, as shown in FIG. 3, the upper and lower ends of the magnet 24 cover the "first end plate portion 401" and the "second end plate portion 402". The "first end plate portion 401" and the "second end plate portion 402" are made of a non-magnetic material. Therefore, the generation of leakage magnetic flux can be suppressed. Further, in Embodiment 1, as shown in FIG. 3, the outer diameters of the third group 310 and the fourth group 311 are made smaller than the outer diameters of the first group 308 and the second group 309. As a result, in the vertical direction of the magnet 24, the third group 310 and the fourth group 311 made of electromagnetic steel sheets are not provided. Therefore, further generation of leakage magnetic flux can be suppressed.

[0085] As described above, according to the rotor 5A of Embodiment 1, by arranging the "first end plate portion 401" and the "second end plate portion 402" made of a non-magnetic material at both axial ends of the magnet 24, no electromagnetic steel sheet is arranged near the magnet 24. Therefore, it is possible to suppress the FLUX decrease (i.e., the flow decrease) due to the leakage magnetic flux. Also, the first electromagnetic steel sheet 301 for the rotor core of the first group 308, the third electromagnetic steel sheet 303 for the rotor core of the second group 309, the second electromagnetic steel sheet 302 for the rotor core of the third group 310, and the fourth electromagnetic steel sheet 304 for the rotor core of the fourth group 311 are fastened to the rotating shaft 104 by shrink fitting. As a result, compared with the case where only the first group 308 is provided, it is possible to increase the inner diameter portion area that is gripped by shrink fitting with the rotating shaft 104 as a whole for the rotor 5A. Therefore, in Embodiment 1, the gripping force by shrink fitting between the rotor 5A and the rotating shaft 104 can be improved, and a decrease in shrink fitting stress can be suppressed.

[0086] From the above, in Embodiment 1, it is possible to suppress a decrease in magnetic force due to the generation of leakage magnetic flux and improve the gripping force between the rotor 5A and the rotating shaft 104. As a result, the reliability with respect to the load torque and the self-weight during the operation of the hermetic compressor 130 can be enhanced.

[0087] In Embodiment 1, a fourth group 311 is arranged on the side opposite to the side where the first group 308 of the third group 310 is arranged. Specifically, with respect to the third group 310 arranged on the "first end 308a" side of the first group 308, the fourth group 311 is arranged above the third group 310, and with respect to the third group 310 arranged on the "second end 308b" side of the first group 308, the fourth group 311 is arranged below the third group 310. Also, the fourth group 311 arranged on the "first end 308a" side is arranged on the right side of the paper surface of FIG. 3, and the fourth group 311 arranged on the "second end 308b" side is arranged on the left side of the paper surface of FIG. 3. In this way, the fourth group 311 is divided and arranged on the left and right sides on the "first end 308a" side and the "second end 308b" side. As a result, since the fourth group 311 functions as a balancer, it is possible to reduce the vibration of the hermetic compressor 130. The fourth group 311 constitutes the balance weight 25 shown in FIG. 1.

[0088] Embodiment 2. <Rotor 5B of the electric motor 103> With reference to FIG. 10, the configuration of the rotor 5B of the electric motor 103 according to Embodiment 2 will be described. FIG. 10 is a (a) plan view seen from above, (b) longitudinal sectional view, and (c) plan view seen from below showing the configuration of the rotor 5B of the electric motor 103 according to Embodiment 2. In FIG. 10(b), the B-B sectional view of FIG. 10(a) is shown.

[0089] As can be seen by comparing FIG. 10 and FIG. 3, in Embodiment 2, the installation of the fourth group 311 is omitted with respect to the configuration of Embodiment 1 shown in FIG. 3. That is, in the rotor 5B according to Embodiment 2, the fourth group 311 is not provided. Therefore, as shown in FIG. 10, the rotor 5B according to Embodiment 2 includes the third group 310, the second group 309, the first group 308, the second group 309, the third group 310, the magnet 24, and the rivet 26. Since the other configurations are the same as those in Embodiment 1, the same reference numerals are used and the description thereof is omitted here.

[0090] Also, in Embodiment 2, as shown in FIG. 10, they are arranged in the order of the third group 310, the second group 309, the first group 308, the second group 309, and the third group 310 from top to bottom.

[0091] The third group 310, the second group 309, the first group 308, the second group 309, and the third group 310 are fixed by the rivets 26 inserted into and communicating with the third rivet insertion hole 3043, the second rivet insertion hole 3023, the first end plate rivet insertion hole 3053 or the second end plate rivet insertion hole 3063, the first rivet insertion hole 3013, the first end plate rivet insertion hole 3053 or the second end plate rivet insertion hole 3063, the second rivet insertion hole 3023, and the third rivet insertion hole 3043.

[0092] As described above, according to the rotor 5B of Embodiment 2, by arranging the "first end plate portion 401" and the "second end plate portion 402" made of a non-magnetic material at both axial ends of the magnet 24, an electromagnetic steel plate is not arranged near the magnet 24. Therefore, it is possible to suppress the FLUX reduction (i.e., flow reduction) due to leakage magnetic flux. Further, the first electromagnetic steel plate 301 for the rotor core of the first group 308, the third electromagnetic steel plate 303 for the rotor core of the second group 309, and the second electromagnetic steel plate 302 for the rotor core of the third group 310 are fastened to the rotating shaft 104 by shrink fitting. As a result, as compared with the case where only the first group 308 is provided, it is possible to increase the inner diameter portion area gripped by shrink fitting between the entire rotor 5B and the rotating shaft 104. Therefore, in Embodiment 2, the gripping force by shrink fitting between the rotor 5B and the rotating shaft 104 can be improved, and the reduction of shrink fitting stress can be suppressed.

[0093] From the above, also in Embodiment 2, similar to Embodiment 1, it is possible to suppress the reduction of magnetic force due to the generation of leakage magnetic flux and improve the gripping force between the rotor 5B and the rotating shaft 104. As a result, the reliability with respect to the load torque and the self-weight during the operation of the hermetic compressor 130 can be enhanced. Further, since the fourth group 311 is not provided, the number of processes in the manufacturing process of the electric motor 103 is reduced, the manufacturing process becomes easy, and the manufacturing cost of the electric motor 103 can be reduced.

[0094] Embodiment 3. <Rotor 5C of electric motor 103> With reference to FIGS. 11 and 12, the configuration of the rotor 5C of the electric motor 103 according to Embodiment 3 will be described. FIG. 11 is a (a) plan view seen from above, (b) longitudinal sectional view, and (c) plan view seen from below showing the configuration of the rotor 5C of the electric motor 103 according to Embodiment 3. In FIG. 11(b), the C-C sectional view of FIG. 11(a) is shown. FIG. 12 is a plan view showing the configuration of the third non-magnetic end plate 307 provided on the rotor 5C of the electric motor 103 according to Embodiment 3. In FIG. 12, the state of the third non-magnetic end plate 307 seen from above is shown.

[0095] In the above Embodiment 1, as shown in FIG. 3, the second group 309 and the third group 310 are arranged on both the “first end 308a” side and the “second end 308b” side of the first group 308. However, the present invention is not limited to this, and the second group 309 and the third group 310 may be provided on at least one of the “first end 308a” side and the “second end 308b” side of the first group 308.

[0096] In Embodiment 3, as shown in FIG. 10, instead of the second group 309 and the third group 310 provided on the “second end 308b” side of the rotor 5A in Embodiment 1, a third non-magnetic end plate 307 is provided. Further, in Embodiment 3, the fourth group 311 provided on the “second end 308b” side of the rotor 5A in Embodiment 1 is not installed.

[0097] That is, as shown in FIG. 11, the rotor 5C of Embodiment 3 includes a fourth group 311, a third group 310, a second group 309, a first group 308, a third non-magnetic end plate 307, a magnet 24, and a rivet 26. The third non-magnetic end plate 307 is made of a non-magnetic material.

[0098] In the above-described Embodiment 1, the first non-magnetic body end plate 305 and the second non-magnetic body end plate 306 of the second group 309 constitute the "second end plate portion 402". In contrast, in Embodiment 3, the third non-magnetic body end plate 307 constitutes the "second end plate portion 402".

[0099] Since other configurations of Embodiment 3 are the same as those of Embodiment 1, the same reference numerals are used for illustration, and the description thereof is omitted here.

[0100] As shown in FIG. 12, the third non-magnetic body end plate 307 has an annular shape in a plan view. The third non-magnetic body end plate 307 has a third end plate inner diameter portion 3071 through which the rotation shaft 104 is inserted, a third end plate rivet insertion hole 3073, and a third end plate outer diameter portion 3075. The third end plate outer diameter portion 3075 is located on the radially outer side of the magnet insertion hole 3014 (see FIG. 4).

[0101] The third end plate inner diameter portion 3071 is a through hole into which the rotation shaft 104 is fitted. The third end plate inner diameter portion 3071 has a circular shape in a plan view. The third end plate inner diameter portion 3071 is disposed at the center of the third non-magnetic body end plate 307. The center of the third end plate inner diameter portion 3071 coincides with the axis of the rotation shaft 104. The rotation shaft 104 is fastened to the third end plate inner diameter portion 3071.

[0102] The third end plate rivet insertion hole 3073 is a through hole into which the rivet 26 is inserted. The third end plate rivet insertion hole 3073 has a circular shape in a plan view. A plurality of third end plate rivet insertion holes 3073 are arranged at intervals in the circumferential direction along the outer periphery of the third end plate inner diameter portion 3071. The positions of the third end plate rivet insertion holes 3073 coincide with the positions of the first rivet insertion holes 3013 (see FIG. 4).

[0103] The third end plate inner diameter portion 3071 is configured such that the distance from the axis of the rotation shaft 104 toward the radially outer side is in the relationship of "third end plate inner diameter portion 3071 < third end plate rivet insertion hole 3073 < third end plate outer diameter portion 3075".

[0104] As shown in Fig. 11, the rotor 5C is arranged in the order of the fourth group 311, the third group 310, the second group 309, the first group 308, and the third non-magnetic end plate 307 from top to bottom. Note that the third non-magnetic end plate 307 may constitute the "second end plate portion 402" by itself, or the "second end plate portion 402" may be constituted by laminating a plurality of the third non-magnetic end plates 307.

[0105] The fourth group 311, the third group 310, the second group 309, the first group 308, and the third non-magnetic end plate 307 are fixed by the rivets 26 inserted and communicated with the third rivet insertion hole 3043, the second rivet insertion hole 3023, the first end plate rivet insertion hole 3053 or the second end plate rivet insertion hole 3063, the first rivet insertion hole 3013, and the third end plate rivet insertion hole 3073.

[0106] As described above, according to the rotor 5C of the third embodiment, by arranging the "first end plate portion 401" and the "second end plate portion 402" made of a non-magnetic material at both axial ends of the magnet 24, an electromagnetic steel plate is not arranged near the magnet 24. Therefore, it is possible to suppress the FLUX decrease (i.e., the flow decrease) due to the leakage magnetic flux. Further, the first electromagnetic steel plate 301 for the rotor core of the first group 308, the third electromagnetic steel plate 303 for the rotor core of the second group 309, the second electromagnetic steel plate 302 for the rotor core of the third group 310, and the fourth electromagnetic steel plate 304 for the rotor core of the fourth group 311 are fastened to the rotating shaft 104 by shrink fitting. As a result, as compared with the case where only the first group 308 is provided, it is possible to increase the inner diameter portion area gripped by shrink fitting with the rotating shaft 104 as the entire rotor 5C. Therefore, in the third embodiment, the gripping force by shrink fitting between the rotor 5C and the rotating shaft 104 can be improved, and the decrease in shrink fitting stress can be suppressed.

[0107] From the above, also in the third embodiment, similar to the first embodiment, it is possible to suppress the decrease in magnetic force due to the generation of leakage magnetic flux and improve the gripping force between the rotor 5C and the rotating shaft 104. As a result, the reliability against the load torque and the self-weight during the operation of the hermetic compressor 130 can be enhanced.

[0108] Embodiment 4. <Rotor 5D of electric motor 103> With reference to FIG. 13, the configuration of the rotor 5D of the electric motor 103 according to Embodiment 4 will be described. FIG. 13 is a (a) top plan view, (b) longitudinal sectional view, and (c) bottom plan view showing the configuration of the rotor 5D of the electric motor 103 according to Embodiment 4. In FIG. 13(b), the D-D sectional view of FIG. 13(a) is shown.

[0109] In the above Embodiment 2, as shown in FIG. 10, the second group 309 and the third group 310 are arranged on both the “first end 308a” side and the “second end 308b” side of the first group 308. However, the present invention is not limited to this, and the second group 309 and the third group 310 may be provided on at least one of the “first end 308a” side and the “second end 308b” side of the first group 308.

[0110] In Embodiment 4, as shown in FIG. 13, instead of the second group 309 and the third group 310 provided on the “second end 308b” side of the rotor 5B in Embodiment 2, a third non-magnetic end plate 307 is provided.

[0111] Since other configurations of Embodiment 4 are the same as those of Embodiment 2, the same reference numerals are used and the description thereof is omitted here.

[0112] That is, as shown in FIG. 13, the rotor 5D of Embodiment 4 includes a third group 310, a second group 309, a first group 308, a third non-magnetic end plate 307, a magnet 24, and a rivet 26. The third non-magnetic end plate 307 is made of a non-magnetic material as described in Embodiment 3. The third non-magnetic end plate 307 may form the “second end plate portion 402” by itself, or the “second end plate portion 402” may be formed by laminating a plurality of third non-magnetic end plates 307.

[0113] In the above-described Embodiment 2, the first non-magnetic body end plate 305 and the second non-magnetic body end plate 306 of the second group 309 constitute the "second end plate portion 402". In contrast, in Embodiment 4, the third non-magnetic body end plate 307 constitutes the "second end plate portion 402".

[0114] Since the configuration of the third non-magnetic body end plate 307 has been described with reference to FIG. 12 in Embodiment 3, the description thereof is omitted here.

[0115] As shown in FIG. 13, the rotor 5D is arranged in the order of the third group 310, the second group 309, the first group 308, and the third non-magnetic body end plate 307 from top to bottom.

[0116] The third group 310, the second group 309, the first group 308, and the third non-magnetic body end plate 307 are fixed by the rivets 26 inserted into and communicating with the second rivet insertion hole 3023, the first end plate rivet insertion hole 3053 or the second end plate rivet insertion hole 3063, the first rivet insertion hole 3013, and the third end plate rivet insertion hole 3073.

[0117] As described above, according to the rotor 5D of Embodiment 4, by arranging the "first end plate portion 401" and the "second end plate portion 402" made of a non-magnetic material at both axial ends of the magnet 24, an electromagnetic steel sheet is not arranged near the magnet 24. Therefore, it is possible to suppress the FLUX decrease (i.e., the flow decrease) due to the leakage magnetic flux. Further, the first electromagnetic steel sheet 301 for the rotor core of the first group 308, the third electromagnetic steel sheet 303 for the rotor core of the second group 309, and the second electromagnetic steel sheet 302 for the rotor core of the third group 310 are fastened to the rotating shaft 104 by shrink fitting. As a result, compared with the case where only the first group 308 is provided, it is possible to increase the inner diameter portion area gripped by shrink fitting with the rotating shaft 104 as a whole of the rotor 5C. Therefore, in Embodiment 4, the gripping force by shrink fitting between the rotor 5C and the rotating shaft 104 can be improved, and the decrease in shrink fitting stress can be suppressed.

[0118] In the above-described Embodiments 1 to 4, an example in which the first group 308, the second group 309, the third group 310, etc. are fixed by the rivets 26 has been described. However, not limited to the rivets 16, the first group 308, the second group 309, the third group 310, etc. may be fixed by other fasteners such as bolts and nuts, for example.

[0119] Also, in the above-described Embodiments 1 to 4, the case where the number of the first rivet insertion holes 3013 and the number of the second rivet insertion holes 3023 are both six has been described as an example, but it is not limited to that case. The number of the first rivet insertion holes 3013 and the number of the second rivet insertion holes 3023 may be any number of two or more. Similarly, in the above-described Embodiments 1 to 4, the case where the first end plate rivet insertion holes 3053, the second end plate rivet insertion holes 3063, and the third rivet insertion holes 3043 are all three has been described as an example, but it is not limited to that case. The first end plate rivet insertion holes 3053, the second end plate rivet insertion holes 3063, and the third rivet insertion holes 3043 may be any number of one or more. However, it is desirable that the respective rivet insertion holes of two or more are arranged to correspond to each other so as to be in line-symmetrical positions in a plan view. The axis of line symmetry may be any line as long as it is a line corresponding to the diameter of the first outer diameter portion 3015 of the electromagnetic steel sheet 301 for the first rotor core.

Explanation of Reference Numerals

[0120] 1 Stator, 3 Insulating member, 4 Coil, 5A Rotor, 5B Rotor, 5C Rotor, 5D Rotor, 9 Lead wire, 21 Rotor core, 22 Magnet insertion hole, 23 Rivet hole, 24 Magnet, 25 Balance weight, 25a Upper balance weight, 25b Lower balance weight, 26 Rivet, 101 Sealed container, 101a Upper container, 101b Lower container, 102 Compression mechanism part, 103 Electric motor, 104 Rotating shaft, 104a Main shaft part, 104b Sub-shaft part, 104c Eccentric shaft part, 105 Cylinder, 105a Cylinder chamber, 106 Main bearing, 107 Sub-bearing, 109 Rolling piston, 119 Glass terminal, 127 Suction muffler, 128 Suction connecting pipe, 129 Discharge pipe, 130 Hermetic compressor, 133 Four-way switching valve, 134 Outdoor heat exchanger, 135 Decompressor, 136 Indoor heat exchanger, 200 Refrigeration cycle device, 301 Electromagnetic steel sheet for the first rotor core, 302 Electromagnetic steel sheet for the second rotor core, 303 Electromagnetic steel sheet for the third rotor core, 304 Electromagnetic steel sheet for the fourth rotor core, 305 First non-magnetic end plate, 306 Second non-magnetic end plate, 307 Third non-magnetic end plate, 308 First group, 308a First end, 308b Second end, 309 Second group, 310 Third group, 311 Fourth group, 401 First end plate part, 402 Second end plate part, 3011 First inner diameter part, 3012 First caulking part for lamination, 3013 First rivet insertion hole, 3014 Magnet insertion hole, 3015 First outer diameter part, 3021 Second inner diameter part, 3022 Second caulking part for lamination, 3023 Second rivet insertion hole, 3025 Second outer diameter part, 3031 Third inner diameter part, 3032 Third caulking part for lamination, 3035 Third outer diameter part, 3041 Fourth inner diameter part, 3042 Fourth caulking part for lamination, 3043 Third rivet insertion hole, 3045 Fourth outer diameter part, 3047 Straight part, 3051 First end plate inner diameter part, 3053 First end plate rivet insertion hole, 3055 First end plate outer diameter part, 3056 Connecting part, 3061 Second end plate inner diameter part, 3063 Second end plate rivet insertion hole, 3065 Second end plate outer diameter part, 3066 Connecting part, 3071 Third end plate inner diameter part, 3073 Third end plate rivet insertion hole, 3075 Third end plate outer diameter part, L1 Distance, L2 Distance.

Claims

1. It has a first inner diameter portion fastened to the rotating shaft, a first rivet insertion hole extending in the axial direction of the rotating shaft and arranged at intervals in the circumferential direction, and a magnet insertion hole extending in the axial direction, and is an annular electromagnetic steel sheet for the first rotor core, which is arranged by stacking a plurality of them in the axial direction, a magnet inserted into the magnet insertion hole, It has a second inner diameter portion fastened to the rotating shaft, a second rivet insertion hole extending in the axial direction and arranged at intervals in the circumferential direction, and is an annular electromagnetic steel sheet for the second rotor core, which is arranged by stacking a plurality of them in the axial direction, An annular electromagnetic steel sheet for the third rotor core, which is arranged between the electromagnetic steel sheet for the first rotor core and the electromagnetic steel sheet for the second rotor core in the axial direction, has a third inner diameter portion fastened to the rotating shaft, and a third outer diameter portion located radially inward of the first rivet insertion hole, A first end plate portion, which is arranged on the outer periphery of the third outer diameter portion, is made of a non-magnetic material, is arranged at one end in the axial direction of the magnet insertion hole, has an annular shape, extends in the axial direction, and has a first end plate rivet insertion hole arranged at intervals in the circumferential direction of the annular semi-annular portion, and a second end plate rivet insertion hole arranged at intervals in the circumferential direction of the remaining semi-annular portion of the annular shape corresponding to the first end plate rivet insertion hole and extending in the axial direction, A second end plate portion, which is made of a non-magnetic material, is arranged at the other end in the axial direction of the magnet insertion hole, has an annular shape, extends in the axial direction, and has an end plate rivet insertion hole arranged at intervals in the circumferential direction, a plurality of rivets inserted in communication with the first rivet insertion hole, the second rivet insertion hole, the first end plate rivet insertion hole or the second end plate rivet insertion hole, and the end plate rivet insertion hole, and is provided with The first outer diameter portion forming the outer periphery of the electromagnetic steel sheet for the first rotor core is located radially outward of the second outer diameter portion forming the outer periphery of the electromagnetic steel sheet for the second rotor core, The second outer diameter portion is located on the radially inner side of the magnet insertion hole and on the radially outer side of the first rivet insertion hole. Rotor of an electric motor.

2. The electromagnetic steel sheet for the second rotor core and the electromagnetic steel sheet for the third rotor core are arranged on at least one of the first end and the second end in the axial direction of the electromagnetic steel sheet for the first rotor core. Rotor of the electric motor according to claim 1.

3. The first end plate portion is arranged on the first end side in the axial direction of the electromagnetic steel sheet for the first rotor core. The first end plate portion A semi-circular ring-shaped first non-magnetic end plate having the first end plate rivet insertion hole, a first end plate inner diameter portion that abuts against the third outer diameter portion of the electromagnetic steel sheet for the third rotor core, and an arcuate first end plate outer diameter portion located on the radially outer side of the magnet insertion hole. A semi-circular ring-shaped second non-magnetic end plate having the second end plate rivet insertion hole, a second end plate inner diameter portion that abuts against the third outer diameter portion of the electromagnetic steel sheet for the third rotor core, and an arcuate second end plate outer diameter portion located on the radially outer side of the magnet insertion hole. It is composed of The first non-magnetic end plate and the second non-magnetic end plate are arranged opposite to each other to form the annular shape. Rotor of the electric motor according to claim 2.

4. The second end plate portion is arranged on the second end side in the axial direction of the electromagnetic steel sheet for the first rotor core. When the electromagnetic steel sheet for the second rotor core and the electromagnetic steel sheet for the third rotor core are arranged on the second end side in the axial direction of the electromagnetic steel sheet for the first rotor core, The second end plate portion is arranged on the outer periphery of the third outer diameter portion. The second end plate portion The first non-magnetic end plate having the first end plate rivet insertion hole as the end plate rivet insertion hole, a first end plate inner diameter portion that abuts against the third outer diameter portion of the electromagnetic steel sheet for the third rotor core, and an arcuate first end plate outer diameter portion located on the radially outer side of the magnet insertion hole. The second non-magnetic end plate having the second end plate rivet insertion hole as the end plate rivet insertion hole, a second end plate inner diameter portion that abuts against the third outer diameter portion of the electromagnetic steel sheet for the third rotor core, and an arcuate second end plate outer diameter portion located on the radially outer side of the magnet insertion hole. Composed of The first non-magnetic end plate and the second non-magnetic end plate are arranged opposite to each other to form the annular shape. The rotor of the electric motor according to claim 2.

5. The second end plate portion is arranged on the second end side in the axial direction of the electromagnetic steel sheet for the first rotor core. When the second electromagnetic steel sheet for the rotor core and the third electromagnetic steel sheet for the rotor core are not arranged on the second end side in the axial direction of the first electromagnetic steel sheet for the rotor core. The second end plate portion A third end plate inner diameter portion through which the rotating shaft is inserted, a third end plate rivet insertion hole as the end plate rivet insertion hole, and a third end plate outer diameter portion located on the radially outer side of the magnet insertion hole, an annular third non-magnetic end plate Composed of The rotor of the electric motor according to claim 2.

6. Semicircular annularly arranged at intervals in the circumferential direction, having a third rivet insertion hole extending in the axial direction of the rotating shaft into which the rivet is inserted, and a fourth inner diameter portion fastened to the rotating shaft, and a plurality of semicircular annular electromagnetic steel sheets for the fourth rotor core stacked and arranged in the axial direction. Provided with The electromagnetic steel sheet for the fourth rotor core is arranged at an end of both ends in the axial direction of the electromagnetic steel sheet for the second rotor core on the side opposite to the side where the electromagnetic steel sheet for the first rotor core is arranged. The rotor of the electric motor according to claim 1 or 2.

7. The electromagnetic steel sheet for the first rotor core further has a caulking portion for first lamination, The distance from the axis of the rotating shaft toward the outer side in the radial direction is, Said first inner diameter portion < said first caulking portion for lamination < said first rivet insertion hole < said magnet insertion hole < said first outer diameter portion And has the relationship of, The rotor of the electric motor according to claim 1 or 2.

8. The electromagnetic steel sheet for the second rotor core further has a caulking portion for second lamination, The distance from the axis of the rotating shaft toward the outer side in the radial direction is, Said second inner diameter portion < said second caulking portion for lamination < said second rivet insertion hole < said second outer diameter portion And has the relationship of, The rotor of the electric motor according to claim 1 or 2.

9. The electromagnetic steel sheet for the third rotor core further has a caulking portion for third lamination, The distance from the axis of the rotating shaft toward the outer side in the radial direction is, Said third inner diameter portion < said third caulking portion for lamination < said third outer diameter portion And has the relationship of, The rotor of the electric motor according to claim 1 or 2.

10. The electromagnetic steel sheet for the first rotor core further has a caulking portion for first lamination, The electromagnetic steel sheet for the second rotor core further has a caulking portion for second lamination, The electromagnetic steel sheet for the third rotor core further has a caulking portion for third lamination, The radial positions of the rotating shaft of the first caulking portion for lamination, the second caulking portion for lamination, and the third caulking portion for lamination coincide with each other, The electromagnetic steel sheet for the first rotor core, the electromagnetic steel sheet for the second rotor core, and the electromagnetic steel sheet for the third rotor core are positioned and fastened by the first caulking portion for lamination, the second caulking portion for lamination, and the third caulking portion for lamination. The rotor of the electric motor according to claim 1 or 2.

11. The electromagnetic steel sheet for the third rotor core connects the electromagnetic steel sheet for the first rotor core and the electromagnetic steel sheet for the second rotor core. The rotor of the electric motor according to claim 1 or 2.

12. The rotor of the electric motor according to claim 1 or 2, and A stator provided on the outer periphery of the rotor and rotating the rotor by magnetic action, An electric motor comprising the same.

13. The electric motor according to claim 12, and A compression mechanism unit driven by the electric motor and compressing fluid inhaled from the outside, A sealed container housing the electric motor and the compression mechanism unit, A compressor comprising the same.

14. The compressor according to claim 13, and An outdoor heat exchanger, An expander, An indoor heat exchanger, A refrigeration cycle apparatus comprising the same.

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