WO2020121485A1

WO2020121485A1 - Electric motor, compressor, and refrigeration cycle device

Info

Publication number: WO2020121485A1
Application number: PCT/JP2018/045897
Authority: WO
Inventors: 義和藤末; 浩二矢部; 和史森島
Original assignee: 三菱電機株式会社
Priority date: 2018-12-13
Filing date: 2018-12-13
Publication date: 2020-06-18
Also published as: CZ2021265A3; JP7080345B2; JPWO2020121485A1; CN113169601A

Abstract

This electric motor is provided with a stator and a rotor. The rotor has: a shaft that serves as a rotating axis; an iron core that has a first iron core group having magnet insertion holes into which are inserted permanent magnets that produce magnetic flux, and a second iron core group having through-holes that communicate with the magnet insertion holes and are formed in a shape that impedes the passage of the permanent magnets, the iron core being fixed to the shaft; and end plates that respectively cover both end surfaces of the iron core.

Description

Electric motor, compressor and refrigeration cycle device

The present invention relates to an electric motor, a compressor, and a refrigeration cycle device. In particular, it relates to the rotor of a permanent magnet embedded motor.

Conventionally, a permanent magnet embedded type electric motor in which a permanent magnet is arranged in the magnet insertion hole of the rotor has been known. Some rotors of a permanent magnet embedded type electric motor have a permanent magnet embedded so as to penetrate the laminated iron core in the axial direction. Here, when the axial length of the permanent magnet is long, an excessive eddy current is generated on the surface of the permanent magnet, which becomes a factor of reducing the efficiency of the electric motor.

Therefore, in a rotor of a permanent magnet embedded motor in which a magnet is arranged in a magnet insertion hole provided in a rotor, a plurality of axially divided rotor members having the magnet insertion hole and the rotor members There is a rotor of a permanent magnet embedded type electric motor that is provided with a partition plate disposed between them and is integrally formed by stacking the plurality of rotor members and the partition plate in the axial direction (for example, Patent Document 1). reference).

　This rotor is composed of three rotor members that are divided in the axial direction and a separator that serves as a partition plate. The rotor member is formed by stacking annular electromagnetic steel plates. Near the outer peripheral surface of the rotor member, a magnet hole for installing a magnet having an opening on the side surface of the rotor member is formed along the axial direction. On the other hand, the separator is coated with an insulating layer to separate the rotor members from each other. As the separator, an electromagnetic steel plate which has the same annular shape as the rotor member and is formed into a thin plate is used. Then, the rotor member and the separator are laminated in the axial direction with the separator interposed between the rotor members, and the rotor member and the separator are integrally coupled to form a rotor body. Here, the inner peripheral edge and the outer peripheral edge of the separator are uniformly arranged on the inner peripheral surface and the outer peripheral surface of the rotor member, respectively.

Further, for the purpose of suppressing centrifugal expansion or deformation of the iron core at the central portion in the axial direction of the rotor, the iron core is formed with a plurality of magnet insertion holes into which magnets are inserted, and the iron core is provided on both side surfaces of the iron core. There is a rotor provided with an end plate that is fixed to a shaft together with an iron core and blocks magnetic flux. Then, the rotor, in the middle of the length direction of the iron core, a disk-shaped separator having no magnet insertion hole is disposed, and the separator and at least the end surface of each magnet are bonded (for example, See Patent Document 2).

In this rotor, one end plate of a disk shape made of a non-magnetic material is inserted and fixed to the shaft, and a pair of left and right half iron cores made of a thin steel sheet laminate are sandwiched between the shafts so as to sandwich the separator. insert. Further, the other end plate made of a non-magnetic material is inserted into the shaft and fixed. The pair of half plates and the separator are clamped by the pair of end plates. That is, an iron core is formed by a pair of half iron cores. Here, the separator may be of any type of magnetic material and non-magnetic material.

JP 2006-158037 A JP 2002-191143 A

However, in the rotor of the electric motor of Patent Document 1, the separator that separates the rotor members is coated with the insulating layer, but the structure is such that the magnet and the separator can contact each other. Therefore, leakage magnetic flux from the magnet to the separator is generated. In Patent Document 1, although measures are taken to provide an opening in the separator for the purpose of reducing the leakage flux, this is not a sufficient countermeasure against leakage flux.

Further, in the structure of the rotor in the electric motor of Patent Document 2, the separator for separating the rotor members is made of a magnetic material and a non-magnetic material, and the separator and the end surface of the magnet are bonded to each other. Therefore, leakage magnetic flux from the magnet to the separator is generated. Therefore, measures against the surface eddy current loss of the magnet are not sufficient.

In order to solve the above problems, an object of the present invention is to provide an electric motor, a compressor, and a refrigeration cycle device that reduce surface eddy current loss generated on the surface of a permanent magnet.

An electric motor according to the present invention is an electric motor including a stator and a rotor, and the rotor has a shaft serving as a rotating shaft and a first iron core group having a magnet insertion hole into which a permanent magnet that generates magnetic flux is inserted. And a second core group that is in communication with the magnet insertion hole and has a through hole formed in a shape that prevents passage of the permanent magnet, and an end plate that covers the iron core fixed to the shaft and both end surfaces of the iron core. And have.

Further, the compressor of the present invention is a hermetically-sealed container that serves as an outer shell, a compression mechanism unit that is installed in the hermetically-sealed container and compresses a refrigerant, and discharges the refrigerant to the outside. And with.

In the refrigeration cycle apparatus of the present invention, the above-mentioned compressor, condenser, decompression device and evaporator are connected by piping to circulate the refrigerant.

According to the present invention, in the rotor of the electric motor, the permanent magnets inserted into the magnet insertion holes of each first iron core group are separated by the second iron core group having a through hole formed in a shape that prevents passage of the permanent magnets. Is provided. Therefore, the magnetic resistance of the permanent magnet increases, and the eddy current generated on the surface of the permanent magnet can be suppressed. Therefore, the device efficiency can be improved.

It is a figure explaining the structure inside the electric motor 1 which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the rotor 10 of the electric motor 1 which concerns on Embodiment 1 of this invention. It is a figure explaining the structure of the 2nd iron core group 11b in the iron core 11 which concerns on Embodiment 1 of this invention. It is a figure explaining the relationship between the permanent magnet 13 and the convex part 15 which concern on Embodiment 1 of this invention. It is a figure explaining the effect acquired by the structure of the rotor 10 of the electric motor 1 which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the rotor 10 of the electric motor 1 which concerns on Embodiment 2 of this invention. It is a figure explaining the structure of the compressor 110 which mounts the electric motor 1 which concerns on Embodiment 2 of this invention. It is a figure showing the example of composition of the refrigerating cycle device concerning Embodiment 3 of this invention.

Hereinafter, embodiments of the invention will be described with reference to the drawings. In the drawings, the components denoted by the same reference numerals are the same or equivalent, and are common to all the texts of the embodiments described below. Further, the forms of the constituent elements shown in the entire specification are merely examples, and the forms are not limited to the forms described in the specification. In particular, the combination of components is not limited to the combination in each embodiment, and the components described in other embodiments can be applied to another embodiment. Further, the upper side in the drawing will be referred to as "upper side" and the lower side will be referred to as "lower side". Further, in the drawings, the relationship of the size of each component may be different from the actual one.

Embodiment 1.
FIG. 1 is a diagram illustrating an internal configuration of an electric motor 1 according to Embodiment 1 of the present invention. In FIG. 1, the electric motor 1 is viewed from the front side. In the first embodiment, a permanent magnet embedded type electric motor 1 will be described. The electric motor 1 has a stator 20 and a rotor 10. The stator 20 has a plurality of teeth 21 and windings 22. In the stator 20, a plurality of teeth 21 are arranged in the circumferential direction and have an annular shape. A winding wire 22 is wound around each tooth 21. An annular rotor 10 is arranged radially inward of the stator 20 at a position facing the teeth 21 so as to be rotatable in the circumferential direction.

FIG. 2 is a diagram showing a configuration of the rotor 10 of the electric motor 1 according to the first embodiment of the present invention. As shown in FIG. 2, the rotor 10 of the first embodiment has an iron core 11, a shaft 12, a plurality of permanent magnets 13 and an end plate 16. The shaft 12 serves as a rotation axis when rotating. The iron core 11 is fixed to the shaft 12. The iron core 11 according to the first embodiment has a first iron core group 11a and a second iron core group 11b that are divided into a plurality in the rotation axis direction. The iron core 11 of the first embodiment has three first iron core groups 11a and two second iron core groups 11b, and the second iron core group 11b is sandwiched between the two first iron core groups 11a. ..

The first iron core group 11a is composed of a laminated body in which thin circular disk-shaped electromagnetic steel sheets are laminated. Therefore, the first iron core group 11a has a columnar shape. Each electromagnetic steel plate in the first iron core group 11a has a plurality of penetrating slits corresponding to the rotation direction in a portion near the outer peripheral surface of the cylinder. In the laminated body in which the electromagnetic steel sheets are laminated, the slit forms the magnet insertion hole 14a. The permanent magnet 13 is inserted into each magnet insertion hole 14a. The permanent magnet 13 is made of rare earth or ferrite. The permanent magnet 13 generates a magnetic field by a magnetic force such that the magnetic flux is directed to the outer peripheral side of the rotor 10.

FIG. 3 is a diagram illustrating a configuration of the second iron core group 11b in the iron core 11 according to the first embodiment of the present invention. The second iron core group 11b has a through hole 14b at a position communicating with the magnet insertion hole 14a of the first iron core group 11a. The second iron core group 11b has at least one convex portion 15 in the through hole 14b portion. In the second iron core group 11b, the protrusion 15 is provided so as to project toward the space side of the through hole 14b, so that the space distance of the portion of the through hole 14b where the protrusion 15 is provided is narrowed, and the through hole 14b is It is formed in a shape that prevents the permanent magnet 13 from passing through. Therefore, the convex portion 15 functions as a stopper that prevents the permanent magnet 13 inserted into the magnet insertion hole 14a from passing through the through hole 14b. Therefore, the permanent magnets 13 in the iron core 11 are arranged separately in the magnet insertion holes 14a of each first iron core group 11a. Here, from the viewpoint of preventing the formation of a magnetic path, it is preferable that the projection 15 that is a part of the electromagnetic steel sheet be as small as possible.

Here, as shown in FIG. 4, which will be described later, in the through hole 14b, the distance d between the through holes 14b in the radial direction of the shaft 12, which serves as the rotation axis of the portion where the convex portion 15 is provided, is the stator 20 and the rotor. A distance equal to or larger than the air gap G is secured with respect to 10. For example, the distance d is set to 2 times or more and 3 times or less of the air gap G. For this reason, in the rotor 10 of the first embodiment, the magnetic flux interlinking with the winding wire 22 is not prevented by the convex portion 15.

As shown in FIG. 3, the second core group 11b according to the first embodiment has three convex portions 15. The three convex portions 15 are provided at positions that do not face each other in the horizontal direction that is the radial direction of the shaft 12 that is the rotation axis. Here, in the iron core 11 of the rotor 10 of the first embodiment, it is assumed that the number of electromagnetic steel plates forming the second iron core group 11b is one. However, it may be formed of a laminated body in which a plurality of electromagnetic steel sheets are laminated.

The end plates 16 are installed at both ends of the iron core 11. The end plate 16 blocks the magnetic flux generated by the permanent magnet 13.

FIG. 4 is a diagram illustrating a relationship between the permanent magnet 13 and the convex portion 15 according to the first embodiment of the present invention. FIG. 4 shows the positional relationship between the permanent magnet 13 inserted into the magnet insertion hole 14a and the plurality of convex portions 15. The permanent magnet 13 inserted into the magnet insertion hole 14a is locked by the convex portion 15 and is prevented from passing through the through hole 14b. Here, there is a gap between the magnet insertion hole 14a and the permanent magnet 13, and the permanent magnet 13 in the magnet insertion hole 14a is tilted in the magnet insertion hole 14a because the entire lower surface is not supported. It becomes a state. Due to the inclination of the permanent magnet 13, part of the permanent magnet 13 protrudes into the space formed in the through hole 14b.

As shown in FIG. 4, the length of the magnet insertion hole 14a in the rotation axis direction is L, and the length of the permanent magnet 13 in the rotation axis direction is l. Further, the thickness of the permanent magnet 13 is T. The length of the convex portion 15 in the direction of the rotation axis is y, and the maximum tilt angle at which the permanent magnet 13 is inclined by the convex portion 15 is θ. At this time, the plurality of convex portions 15 included in the second iron core group 11b of the first embodiment are formed so that the relationship of 1×cos θ+T×sin θ<L+y is established. Therefore, even if some of the permanent magnets 13 in the magnet insertion holes 14a of the first iron core group 11a on both sides of the second iron core group 11b protrude to the space side of the through hole 14b, the permanent magnets 13 are physically separated from each other. Do not contact each other.

As described above, according to the rotor 10 of the electric motor 1 in the first embodiment, the permanent magnets 13 inserted into the magnet insertion holes 14a of the first iron core groups 11a into which the magnets can be inserted are included in the second iron core group 11b. It is separated by the convex portion 15. Therefore, the magnetic resistance of the permanent magnet 13 increases, and the eddy current generated on the surface of the permanent magnet 13 can be suppressed. Therefore, the highly efficient electric motor 1 can be obtained.

Further, when the second iron core group 11b has a plurality of convex portions 15, the plurality of convex portions 15 are arranged at positions that do not face each other in the radial direction of the shaft 12 that serves as the rotation axis. For this reason, the convex portions 15 face each other without narrowing the space of the through hole 14b, and it is difficult for a magnetic path to be formed between the convex portions 15 and the generation of leakage magnetic flux can be suppressed. Therefore, the efficiency of the electric motor 1 can be further increased.

Further, in the through hole 14b, the distance d in the radial direction of the shaft 12 at the portion where the convex portion 15 is provided is ensured by ensuring a distance equal to or greater than the air gap G between the stator 20 and the rotor 10, and The magnetic flux interlinking with the line 22 is not disturbed. Therefore, the efficiency of the electric motor 1 can be further increased.

Further, in the second iron core group 11b of the first embodiment, the length L of the magnet insertion hole 14a in the rotation axis direction, the length l and thickness T of the permanent magnet 13 in the rotation axis direction, and the length of the permanent magnet 13 in the magnet insertion hole 14a. The maximum inclination angle θ and the length y of the convex portion 15 in the rotation axis direction have the convex portion 15 that satisfies the relationship of 1×cos θ+T×sin θ<L+y. Therefore, physical contact between the permanent magnets 13 included in the adjacent first iron core groups 11a can be avoided. As described above, it is preferable that the convex portion 15 is small, but by suppressing the generation of the eddy current generated on the surface of the permanent magnet 13 by forming the convex portion 15 small after satisfying the above relationship, It is possible to prevent damage such as cracking of the permanent magnet 13.

FIG. 5 is a diagram illustrating an effect obtained by the configuration of the rotor 10 of the electric motor 1 according to the first embodiment of the present invention. In FIG. 5, (a) represents the torque of the conventional rotor configured without dividing the iron core and the magnet and the surface eddy current loss of the permanent magnet. Further, (b) shows the torque and the surface eddy current loss of the permanent magnet of the conventional rotor that is configured by dividing it into two without having the through hole 14b like the rotor 10 of the first embodiment. .. Then, (c) represents the torque of the rotor 10 and the surface eddy current loss of the permanent magnet according to the first embodiment. As shown in FIG. 5, the rotor of the first embodiment can suppress the surface eddy current loss of the permanent magnet while maintaining the same torque as the conventional rotor.

Embodiment 2.
FIG. 6 is a diagram showing the configuration of the rotor 10 of the electric motor 1 according to the second embodiment of the present invention. 6, members and the like denoted by the same reference numerals as those in FIG. 1 and the like are the same as those described in the first embodiment. In the rotor 10 of the second embodiment, the first iron core group 11a provided with the magnet insertion hole 14a in which the permanent magnet 13 is inserted is arranged on one end surface side. Then, on the other end face side, the second iron core group 11b provided with the through hole 14b for blocking the passage of the permanent magnet 13 by the convex portion 15 described in the first embodiment is arranged. The end plates 16 are arranged and integrated on both end surfaces. Here, the electric motor 1 according to the second embodiment is installed in a compressor that compresses and discharges a refrigerant in a refrigeration cycle device.

FIG. 7 is a diagram illustrating a configuration of a compressor 110 equipped with the electric motor 1 according to the second embodiment of the present invention. In the compressor 110, the shell 111 serving as an outer shell is a closed container that houses the electric motor 1, the compression mechanism unit 113, and the like inside. The suction pipe 112 is installed in the shell 111. The suction pipe 112 is a pipe for guiding the refrigerant to be compressed, which is sucked from the suction muffler 116, into the shell 111. The compression mechanism section 113 has a compression chamber formed by combining a fixed scroll and an orbiting scroll. The orbiting scroll is connected to a main shaft 114 that is rotated by the electric motor 1 mounted in the compressor 110, and rotates with the rotation of the main shaft 114 to receive the power supply and remove the refrigerant that has flowed into the compression chamber. Compress and send to the outside. The discharge pipe 115 is a pipe through which the compressed refrigerant is discharged. Then, the drive driver 117 is electrically connected to the electric motor 1 in the compressor 110, supplies electric power to the electric motor 1, and controls the driving of the compressor 110.

Here, the permanent magnet 13 in the rotor 10 of the electric motor 1 according to the second embodiment will be described. In terms of magnets, generally, a magnet having a strong magnetic force is cheaper in price. Therefore, it is considered to use a magnet having a strong magnetic force for the permanent magnet 13 to reduce the cost. Even if a magnet having a strong magnetic force is used as the permanent magnet 13, the volume of the permanent magnet 13 inserted into the magnet insertion hole 14a is reduced in order to maintain the generation of a magnetic field to the same extent as in the conventional case. At this time, in consideration of diversion of the core type of the rotor 10, in general, a method of reducing the volume of the permanent magnet 13 by shortening the dimension of the permanent magnet 13 in the rotation axis direction is adopted.

However, if the dimensions of the stator 20 and the rotor 10 in the rotation axis direction are shortened in accordance with the reduction of the dimension of the permanent magnet 13 in the rotation axis direction, the winding constant of the winding 22, which is a control constant of the electric motor 1, is reduced. Resistance and inductance change. For this reason, it becomes impossible to divert a drive driver that has been designed based on the dimension of the conventional rotor in the direction of the rotation axis.

On the other hand, when the dimension of the rotor 10 in the direction of the rotation axis is not changed and only the dimension of the permanent magnet 13 in the direction of the rotation axis is shortened, the displacement occurs between the magnetic center of the permanent magnet 13 and the center of the stator 20. The maximum magnetic thrust increases and the minimum decreases. Therefore, for example, when used as an electric motor for a compressor, when the magnetic thrust increases, the frictional force of the compression mechanism component increases. Further, when the magnetic thrust decreases, the vibration of the compressor mechanism component in the rotation axis direction increases.

Therefore, in the electric motor 1 according to the second embodiment, the magnetic thrust generated by the deviation between the magnetic center of the permanent magnet 13 and the center of the stator 20 is generated by the first iron core group 11a, the permanent magnets 13, and the second iron core group 11b. Adjust by changing the length. More specifically, according to the dimension of the permanent magnet 13 shortened by increasing the magnetic force in the direction of the rotation axis, the direction of the rotation axis of the first iron core group 11a having the magnet insertion hole 14a into which the permanent magnet 13 is inserted. Stipulate the dimensions of. The through hole 14b into which the permanent magnet 13 is not inserted is provided so that the dimension of the first iron core group 11a and the second iron core group 11b in the rotation axis direction becomes the dimension of the iron core in the conventional rotor in the rotation axis direction. The dimension of the second iron core group 11b in the rotation axis direction is defined. Therefore, the length of the iron core 11 of the rotor 10 in the direction of the rotation axis is the same as that of the conventional rotor as a whole. Therefore, the conventional drive driver can be used in the compressor.

As described above, according to the rotor 10 of the electric motor 1 of the second embodiment, the rotor core 10 of the first iron core group 11a and the second iron core group 11b is adjusted in the rotational axis direction according to the length of the permanent magnet 13 in the rotational axis direction. The length was adjusted and specified. Therefore, the dimension of the iron core 11 in the rotation axis direction can be made the same as that of the conventional rotor. Therefore, the drive driver used in the conventional compressor can be used. Further, since a magnet having a strong magnetic force can be used as the permanent magnet 13, the cost of the rotor 10 and the electric motor 1 can be reduced.

Embodiment 3.
FIG. 8: is a figure showing the structural example of the refrigerating-cycle apparatus which concerns on Embodiment 3 of this invention. Here, FIG. 8 shows an air conditioner as a refrigeration cycle device. In the air conditioner of FIG. 8, the outdoor unit 100 and the indoor unit 200 are connected by a gas refrigerant pipe 300 and a liquid refrigerant pipe 400 to form a refrigerant circuit for circulating a refrigerant. The outdoor unit 100 has a compressor 110, a four-way valve 120, an outdoor heat exchanger 130, an expansion valve 140, and an outdoor blower 150. The indoor unit 200 also has an indoor heat exchanger 210 and an indoor blower 220.

The compressor 110 is equipped with the electric motor 1 described in the first and second embodiments. The compressor 110 compresses the drawn refrigerant and discharges it. Here, it is assumed that the drive frequency of the compressor 110 can be arbitrarily changed by, for example, the drive driver 117 described in the second embodiment.

The four-way valve 120 is a valve that switches the flow of the refrigerant depending on the cooling operation and the heating operation. The outdoor heat exchanger 130 exchanges heat between the refrigerant and the outdoor air. For example, during heating operation, it functions as an evaporator to evaporate and vaporize the refrigerant. Further, it functions as a condenser during the cooling operation, condensing and liquefying the refrigerant. Then, the outdoor blower 150 sends outdoor air to the outdoor heat exchanger 130.

An expansion valve 140 such as a throttle device (flow rate control means) serving as a decompression device decompresses and expands the refrigerant. For example, when the electronic expansion valve is used, the opening degree is adjusted based on an instruction from a control means (not shown). The indoor heat exchanger 210 exchanges heat between the air to be air-conditioned and the refrigerant, for example. It functions as a condenser during heating operation and condenses and liquefies the refrigerant. In addition, during cooling operation, it functions as an evaporator to evaporate and vaporize the refrigerant. Then, the indoor blower 220 sends the air to be air-conditioned to the indoor heat exchanger 210.

As described above, according to the refrigeration cycle apparatus of the third embodiment, since the compressor 110 having the electric motor 1 described in the first and second embodiments is included as a device, the efficiency of the entire apparatus is improved. You can drive well. In particular, as described in the second embodiment, by adjusting the length of the first iron core group 11a and the second iron core group 11b in the rotation axis direction, the same length as the rotation axis direction of the conventional rotor iron core is obtained. Can be Therefore, it is possible to divert the drive driver 117 in the compressor 110 and reduce the cost of the compressor 110.

1 electric motor, 10 rotor, 11 iron core, 11a first iron core group, 11b second iron core group, 12 shaft, 13 permanent magnet, 14a magnet insertion hole, 14b through hole, 15 convex portion, 16 convex plate, 16 end plate, 20 stator, 21 teeth, 22 windings, 100 outdoor unit, 110 compressor, 111 shell, 112 suction pipe, 113 compression mechanism part, 114 main shaft, 115 discharge pipe, 116 suction muffler, 117 drive driver, 120 four-way valve, 130 outdoor heat exchange Device, 140 expansion valve, 150 outdoor blower, 200 indoor unit, 210 indoor heat exchanger, 220 indoor blower, 300 gas refrigerant pipe, 400 liquid refrigerant pipe.

Claims

An electric motor including a stator and a rotor,
The rotor is
A shaft that serves as a rotation axis,
A first core group having a magnet insertion hole into which a permanent magnet that generates a magnetic flux is inserted, and a second core group having a through hole that is in communication with the magnet insertion hole and has a shape that prevents passage of the permanent magnet. And an iron core fixed to the shaft,
An electric motor comprising: an end plate that covers both end surfaces of the iron core.
The second core group, in the radial direction of the shaft, has a plurality of protrusions protruding toward the space side of the through hole,
The electric motor according to claim 1, wherein the plurality of convex portions are provided at positions that do not face each other in the radial direction of the shaft of the through hole.
The second core group, in the radial direction of the shaft, has a convex portion protruding toward the space side of the through hole,
The length of the magnet insertion hole in the rotation axis direction is L, the length of the permanent magnet in the rotation axis direction is 1, the thickness of the permanent magnet is T, the length of the protrusion in the rotation axis direction is y, and the magnet is inserted. The electric motor according to claim 1, wherein the convex portion has a relationship of 1×cos θ+T×sin θ<L+y, where θ is a maximum inclination angle of the permanent magnet in the hole.
The electric motor according to claim 2 or 3, wherein a distance in the radial direction of the shaft of the through hole in a portion where the convex portion is provided is longer than a distance between the stator and the rotor.
A closed container that serves as an outer shell,
A compression mechanism unit installed in the closed container for compressing the refrigerant and discharging it to the outside,
A compressor provided with the electric motor according to any one of claims 1 to 4, which supplies power to the compression mechanism portion.
A refrigeration cycle device having a refrigerant circuit in which the compressor, the condenser, the pressure reducing device, and the evaporator according to claim 5 are connected by piping, and the refrigerant is circulated.