KR20220158484A - Hermetic compressor - Google Patents

Abstract

A hermetic compressor is disclosed. In the hermetic compressor according to the present embodiment, a yoke of a stator core is provided with a slit formed within a circumferential range of the slot, and the slit has a circumferential length longer than a radial width. Accordingly, most of stress acting on the stator core is relieved by deformation of the slit in a process of press-fitting the stator core to the inner circumferential surface of a casing. While minimizing the deformation generated in the stator core, high-frequency noise caused by the deformation of the stator is reduced. The performance of the hermetic compressor can be further improved by reducing the loss of a transmission part.

Description

Hermetic Compressor {HERMETIC COMPRESSOR}

The present invention relates to a hermetic compressor having a stator press-fitted into a casing of the hermetic compressor.

In general, in an inner space of a casing provided in a hermetic compressor, a transmission unit generating a driving force and a compression unit coupled to the transmission unit and operating while compressing the sucked refrigerant are disposed together. The hermetic compressor may be classified into a reciprocating type, a scroll type, a rotary type, a vibration type, and the like according to a method of compressing the refrigerant. The reciprocating type, the scroll type, and the rotary type are methods using the rotational force of the transmission unit, and the vibration type is a method using the reciprocating motion of the transmission unit.

Meanwhile, in the case of a compressor applied to an indoor home appliance such as a clothes dryer, a method for improving high-frequency noise generated during operation is required. High-frequency noise has noise characteristics that are offensive to human ears.

Among the causes of the increase in high-frequency noise of the compressor, there is a deformation caused by a process in which a stator of a transmission part is press-fitted into a casing of a hermetic compressor. At this time, the deformation generated in the stator increases not only high-frequency noise but also loss of the transmission part and reduces the performance of the compressor.

Meanwhile, Patent Document 1 (Japanese Patent Publication No. 3392781) discloses a structure of a stator applied to a hermetic compressor.

In the case of the stator of Patent Document 1, a structure in which a slot is provided to form an empty space on the outer periphery of the stator is disclosed. However, in the case of the slot disclosed in Patent Document 1, it is intended to increase the efficiency of the hermetic compressor, and there is no disclosure of a structure and feature for reducing deformation generated in the process of press-fitting the stator into the hermetic container.

Japanese Patent Publication No. 3392781 (2003.01.24.)

One object of the present invention is to provide a hermetic compressor capable of reducing noise by reducing deformation of the stator generated during a process in which a stator of a transmission unit is press-fitted into an inner circumferential surface of a casing.

In order to achieve one object of the present invention, a hermetic compressor includes a casing, a compression unit and a transmission unit. The compression unit is disposed in an inner space of the casing. The compression unit includes a compression space in which the sucked refrigerant is compressed. The transmission unit is coupled to the compression unit by a rotating shaft. The transmission unit provides power to the compression unit to compress the refrigerant. The transmission unit includes a stator and a rotor. The stator includes a stator core and a coil. The stator core is inserted into and fixed to the inner circumferential surface of the casing. The coil is wound on the stator core. The rotor is rotatably disposed inside the stator.

The stator core includes a yoke and a plurality of teeth. The yoke forms an outer circumference of the stator core. The yoke is press-fitted to the inner circumferential surface of the casing. The coil is wound around the plurality of teeth. The plurality of teeth are formed to protrude toward the center of the stator core from the inner circumferential surface of the yoke. The plurality of teeth are spaced apart from each other along the circumferential direction.

A plurality of slots are provided in the yoke. The plurality of slots form empty spaces between the plurality of teeth.

A slit is provided inside the yoke. The slit is formed within the circumferential extent of the slot. The circumferential length of the slit is longer than the radial width of the slit.

The slit is formed in a portion of the yoke that is relatively vulnerable to deformation by the slot when the stator core is press-fitted.

Through this, in the process of press-fitting the stator core to the inner circumferential surface of the casing, most of the stress acting on the stator core is relieved by deformation generated in the region where the slit is formed.

That is, most of the main structures of the stator core except for deformation in the peripheral area where the slit is formed may be maintained without causing deformation.

As a result, it is possible to minimize deformation generated in the process of press-fitting the stator core into the inner circumferential surface of the casing, thereby reducing high-frequency noise due to deformation of the stator, and improving performance of the hermetic compressor by reducing loss of the rolling part.

In addition, the yoke has a plurality of contact portions and a plurality of recesses. The plurality of contact portions come into contact with the inner circumferential surface of the casing and are press-fitted. The plurality of recesses are disposed between the plurality of contact portions adjacent to each other. The recess is radially spaced from an inner circumferential surface of the casing. The contact portion is formed within the circumferential extent of the slot. The contact portion may be disposed to overlap the slot in a radial direction.

Through this, most of the stress generated during the press-fitting of the stator core may be concentrated on the contact portion, and most of the deformation generated in the stator core may be concentrated on the slit.

As a result, deformation can be minimized in most other regions of the stator core other than the slit.

In addition, the slit may be formed to be eccentric toward the outer circumferential surface of the yoke portion.

In addition, a radial width of the slit may be smaller than or equal to a radial width between the contact portion and the slot.

In addition, a radial distance from the contact portion to the slit may be smaller than or equal to a radial depth of the recess from the inner circumferential surface of the casing.

According to this configuration, it is possible to minimize the reduction of the area of the magnetic yoke.

In addition, the plurality of slits may be provided, and the plurality of slits may be spaced apart from each other along a circumferential direction or a radial direction of the stator core.

Through this, the area of the slit is increased to further reduce deformation of the stator core.

According to another example related to the present invention, the yoke includes a plurality of contact portions that are press-fitted in contact with the inner circumferential surface of the casing; and a recess disposed between the plurality of contact portions adjacent to each other and spaced apart from an inner circumferential surface of the casing, the contact portion is formed within a circumferential range of the slot, a plurality of slits are provided, and the plurality of slits are provided. The slits may be cut from both ends of the contact part in a circumferential direction toward a radial center line of the contact part.

According to another example related to the present invention, the plurality of slits may be formed symmetrically with respect to a radial center line of the contact portion.

According to another example related to the present invention, each of the plurality of slits may be formed in a straight line or bent at both ends in the circumferential direction of the contact portion.

According to another example related to the present invention, the length of each of the plurality of slits may be smaller than or equal to the distance between the plurality of slits adjacent to each other in a circumferential direction.

According to another example related to the present invention, both ends of each of the plurality of slits may be formed in a curved surface.

According to another example related to the present invention, a pole shoe may extend in a circumferential direction from an inner end of each of the plurality of teeth, and a plurality of pole shoes adjacent to each other in the circumferential direction may be connected to each other.

According to this configuration, the plurality of pole shoes are connected to each other to effectively support deformation occurring at the contact portion.

The effects of the present invention obtained through the above solutions are as follows.

The hermetic compressor of the present invention includes a compression unit disposed in an inner space of a casing and a transmission unit providing power to compress refrigerant to the compression unit, and the transmission unit includes a stator and a rotor including a stator core and a coil. do. The stator core includes an outer circumferential portion press-fitted to an inner circumferential surface of the casing, and a plurality of protrusions spaced apart from each other along the outer circumferential portion of the stator core on which coils are wound. Here, the outer circumferential portion of the stator core is provided with a slit partially cut and formed on a position corresponding to a slot forming an empty space between the plurality of protrusions. That is, when the stator core is press-fitted, a slit is formed on a portion relatively vulnerable to deformation by a slot structure forming an empty space.

Accordingly, in the process of press-fitting the stator core of the stator to the inner circumferential surface of the casing, the effects of the present invention obtained through the above-described solution are as follows.

The hermetic compressor of the present invention includes a compression unit disposed in an inner space of a casing and a transmission unit providing power to compress refrigerant to the compression unit, and the transmission unit includes a stator and a rotor including a stator core and a coil. do. The stator core includes a yoke press-fitted to the inner circumferential surface of the casing, and a plurality of teeth on which coils are wound and spaced apart from each other along the yoke of the stator core. Here, the yoke of the stator core is provided with a slit partially cut and formed on a position corresponding to a slot forming an empty space between a plurality of teeth. That is, when the stator core is press-fitted, a slit is formed on a portion relatively vulnerable to deformation by a slot structure forming an empty space.

Accordingly, in the process in which the stator core of the stator is press-fitted to the inner circumferential surface of the casing, most of the stress acting on the stator core is relieved by deformation generated in the region where the slit is formed. That is, most of the main structures of the stator core except for the deformation in the peripheral area where the slits are formed can be maintained as they are without causing deformation. As a result, it is possible to reduce high-frequency noise and vibration due to stator deformation by minimizing the deformation occurring in the process of press-fitting the stator core to the inner circumferential surface of the casing, and to improve the performance of the hermetic compressor by reducing the loss of the transmission part. have.

1 is a cross-sectional view of an airtight compressor according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a stator core and a rotor shown in FIG. 1 disposed inside a casing;
FIG. 3 is a plan view illustrating a state in which a stator core and a rotor are disposed inside the casing shown in FIG. 2 .
4 is a plan view showing another example of a stator core disposed inside the casing shown in FIG. 2;
5 is a plan view showing another example of a stator core disposed inside a casing.
FIG. 6 is a plan view showing another example of a stator core disposed inside the casing shown in FIG. 2;
7 is a perspective view of the stator core shown in FIG. 6;
FIG. 8 is a plan view showing another example of a stator core disposed inside the casing shown in FIG. 2;
9 is a perspective view of the stator core shown in FIG. 8;

Hereinafter, the hermetic compressor 10 related to the present invention will be described in more detail with reference to the drawings.

In this specification, the same or similar reference numerals are assigned to the same or similar components even in different embodiments, and overlapping descriptions thereof will be omitted.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

1 is a cross-sectional view of a hermetic compressor 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing that the stator core 211 and the rotor 220 shown in FIG. 1 are disposed inside the casing 100. Referring to FIG. FIG. 3 is a plan view showing the arrangement of the stator core 211 and the rotor 220 inside the casing 100 shown in FIG. 2 .

Referring to FIGS. 1 to 3 , the hermetic compressor 10 includes a casing 100 , a compression unit 330 and a transmission unit 200 .

The casing 100 forms the exterior of the hermetic compressor 10 . The inner space of the casing 100 may be formed to be airtight.

The compression unit 330 is disposed in the inner space of the casing 100 and includes a compression space 332 in which the sucked refrigerant is compressed.

The transmission unit 200 is coupled to the compression unit 330 by the rotational shaft 250 and is configured to provide power for compressing the refrigerant to the compression unit 330 .

The electric motor 200 includes a stator 210 and a rotor 220 .

The stator 210 may include a stator core 211 inserted and fixed into the casing 100 and a coil 212 wound around the stator core 211 . For example, the stator core 211 may be press-fitted to the inner circumferential surface of the casing 100 by shrinking or the like.

The rotor 220 is spaced apart from the stator 210 and is disposed inside the stator 210 . A rotating shaft 250 is coupled to the center of the rotor 220, and a roller 340 constituting the compression unit 300 is integrally formed or assembled at an end of the rotating shaft 250.

Accordingly, when power is applied to the stator 210, the rotor 220 is rotated by a force generated by a magnetic field formed between the stator 210 and the rotor 220. As the rotor 220 rotates, power is transmitted to the compression unit 300 by the rotation shaft 250 passing through the center of the rotor 220 .

One end of the rotating shaft 250 is press-fitted to the rotor 220 and the other end of the rotating shaft 250 is rotatably coupled to the main bearing 310 and the sub bearing 320 .

In addition, a roller 340 is integrally formed or coupled to the other end of the rotating shaft 250 and is rotatably coupled to the compression unit 330 . An oil passage 251 may be formed at the center of the rotating shaft 250 along the axial direction.

The compression unit 330 is provided between the main bearing 310 and the sub bearing 320 installed on both sides in the axial direction to form a compression space 332 for the refrigerant. The compression space 332 may be partitioned into a plurality of spaces by a plurality of vanes 350 .

The main bearing 310 includes a first plate portion 311 covering one side of the compression portion 330 and a first bearing portion protruding from the central portion of the first plate portion 311 to support the rotary shaft 250. (312).

The outer circumferential surface of the first plate portion 311 is shrink-fitted or welded to the inner circumferential surface of the casing 100, and a suction port 315 to which a refrigerant intake pipe 115 is inserted and connected is formed inside the first plate portion 311. do.

The inlet 315 includes a first hole 315a formed from an outer circumferential surface of the first plate part 311 toward the first bearing part 312, and a first plate part 311 formed at an inner end of the first hole 315a. ) It consists of a second hole (315b) that penetrates toward the lower surface of the.

The middle plate 360 is formed in an annular shape with a shaft hole 361 so that the rotating shaft 250 can be inserted rotatably, and a suction passage 362 is formed around the shaft hole 361. The suction passage 362 is formed to communicate with the second hole 315b.

Meanwhile, the stator core 211 includes a yoke 211a, teeth 211b, and slots 211c.

The teeth 211b protrude from the yoke 211a toward the center of the stator core 211, and the coil 212 is wound around the teeth 211b. Also, the teeth 211b are spaced apart from each other along the circumferential direction of the stator core 211 .

A pole shoe 211b1 is provided at an inner end of the tooth 211b. The pole shoe 211b1 is formed to protrude from the inner end of the tooth 211b in the circumferential direction toward the inner end of the adjacent tooth 211b along the circumferential direction.

Also, a plurality of slots 211c forming empty spaces are provided between the plurality of teeth 211b adjacent to each other. A plurality of teeth 211b and a plurality of slots 211c are alternately disposed along the circumferential direction of the stator core 211 .

The yoke 211a may be formed in a circular ring shape. The yoke 211a may form an outer circumference of the stator core 211 . A plurality of contact portions 211a1 and a plurality of recesses 211a2 are provided on the outer circumferential side of the yoke 211a.

The contact portion 211a1 contacts the inner circumferential surface of the casing 100 and is press-fitted. The contact portion 211a1 has a predetermined curvature and is formed in a curved shape. The outer circumferential surface of the contact portion 211a1 and the inner circumferential surface of the casing 100 may have curvatures corresponding to each other.

The plurality of contact portions 211a1 are spaced apart from each other along the circumferential direction of the yoke 211a. A plurality of recesses 211a2 are disposed between the plurality of contact portions 211a1. The plurality of contact portions 211a1 and the plurality of recesses 211a2 are alternately disposed along the circumferential direction of the yoke 211a.

The contact portion 211a1 may be formed within the circumferential extent of the slot 211c. A circumferential center of the contact portion 211a1 may be formed to coincide with a circumferential center of the slot 211c.

The circumference of the contact portion 211a1 may be smaller than or equal to the outermost circumference of the slot 211c. In this embodiment, the circumference of the contact portion 211a1 is smaller than the outermost circumference of the slot 211c.

The contact portion 211a1 and the slot 211c may be disposed to overlap each other in a radial direction.

Teeth 211b may be formed within the circumferential extent of recess 211a2. The circumferential width of the recess 211a2 may be greater than or equal to the circumferential width of the tooth 211b. In this embodiment, the circumferential width of the recess 211a2 is larger than that of the tooth 211b.

The recesses 211a2 and the teeth 211b may be arranged to overlap each other in a radial direction.

The recess 211a2 is formed to be recessed radially inward from the outer circumferential surface of the yoke 211a. The recess 211a2 is made to connect a plurality of contact portions 211a1 adjacent to each other in the circumferential direction. The recess 211a2 may extend along the axial direction of the yoke 211a.

The recess 211a2 may be formed in a curved or/and flat shape. In this embodiment, the flat portion 213 and the curved groove 214 may be formed in a combined form. For example, the first flat part 2131 and the second flat part 2132 may be disposed on both left and right sides of the recess 211a2 with the curved groove 214 therebetween.

The first flat portion 2131 and the second flat portion 2132 may be formed stepwise from each other in the radial direction. The first flat portion 2131 and the second flat portion 2132 may have different widths in the circumferential direction. In this embodiment, the width of the second flat portion 2132 in the circumferential direction is larger than that of the first flat portion 2131 in the circumferential direction.

The first flat part 2131 is connected to one end of the contact part 211a1, and the second flat part 2132 connects the first flat part 2131 and the curved groove 214. The center of the curved groove 214 may be aligned with the radial center line of the tooth 211b.

Half of the first flat portion 2131, the second flat portion 2132, and the curved groove 214 may be formed symmetrically with respect to the radial center line of the tooth 211b.

According to this configuration, the recess 211a2 and the tooth 211b are disposed to overlap in the radial direction, and the contact portion 211a1 and the slot 211c are disposed to overlap in the radial direction, so that the tooth 211b overlaps the recess 211a2. ), the contact portion 211a1 may act to reinforce the stiffness (thickness) of the slot 211c, respectively.

However, when the stator core 211 is press-fitted into the inner circumferential surface of the casing 100, the contact portion 211a1 is pressed in the radial direction, and deformation may occur in the contact portion 211a1. Stress is concentrated on the contact portion 211a1.

Due to this, stress of the contact portion 211a1 may be transferred from the contact portion 211a1 to the entire stator core 211, leading to local deformation of the stator core 211.

To prevent this, a plurality of slits 211d are provided inside the yoke 211a of the stator core 211 .

The slit 211d is disposed between the contact portion 211a1 and the slot 211c. The slit 211d may extend along the circumferential direction. It is formed to penetrate along the axial direction of the yoke 211a. The circumferential length of the slit 211d may be longer than the radial width of the slit 211d.

The slit 211d is disposed eccentrically towards the outer circumferential surface of the yoke 211a. The distance from the contact portion 211a1 to the slit 211d may be smaller than or equal to the depth of the inner end (curved groove 214) of the recess 211a2 from the inner circumferential surface of the casing 100 .

In this embodiment, the distance between the contact portion 211a1 and the slit 211d is smaller than the depth of the inner end of the recess 211a2 from the inner circumferential surface of the casing 100.

It is preferable that the slit 211d be disposed radially outside the inner end of the recess 211a2.

If the slit 211d is disposed radially inner than the inner end of the recess 211a2, the slit 211d blocks the magnetic path (the path through which the magnetic flux passes) inside the yoke 211a so that the area of the magnetic path narrows. , because the performance of the motor is lowered.

The slit 211d is disposed within the circumferential extent of the slot 211c. The slit 211d is formed within the circumferential extent of the contact portion 211a1.

According to this configuration, when the stator core 211 is press-fitted into the casing 100, the contact portion 211a1 is relatively vulnerable to deformation due to the slot 211c forming an empty space.

The slit 211d is disposed between the contact portion 211a1 and the slot 211c, and is disposed adjacent to the contact portion 211a1, so that when the stator core 211 is press-fitted to the inner circumferential surface of the casing 100, the stator core 211 The stress of is transferred to the slit 211d through the contact portion 211a1.

The slit 211d itself is deformed by stress and absorbs the stress, thereby minimizing deformation of the stator core 211 transmitted around the contact portion 211a1.

As a result, according to the configuration of the hermetic compressor 10 according to an embodiment of the present invention, the deformation occurring in the process of press-fitting the stator core 211 to the inner circumferential surface of the casing 100 is minimized so that the stator 210 It is possible to improve the performance of the hermetic compressor 10 by reducing the loss of the transmission unit 200 while reducing high-frequency noise due to deformation.

FIG. 4 is a plan view showing another example of the stator core 211 disposed inside the casing 100 shown in FIG. 2 .

5 is a plan view showing another example of the stator core 211 disposed inside the casing 100.

A plurality of slits 211d may be provided per contact portion 211a1.

As shown in FIG. 4 , the plurality of slits 211d may include first slits 211d1 and second slits 211d2 spaced apart from each other along the radial direction of the stator core 211 .

Alternatively, as shown in FIG. 5, the plurality of slits 211d1 and 211d2 may include a first slit 211d1 and a second slit 211d2 spaced apart from each other along the circumferential direction of the stator core 211. have.

According to the structure of the first and second slits 211d1 and 211d2 as described above, the area where the stress generated at the contact portion 211a1 of the yoke 211a of the stator core 211 can be relieved is further increased, so that the stator core ( 211) can be further reduced. That is, the area by the slit 211d in which deformation may occur when the stator core 211 is press-fitted can be further increased.

Since other configurations are the same as or similar to those of the above-described embodiments of FIGS. 1 to 4 , redundant descriptions will be omitted.

Hereinafter, FIG. 6 is a plan view showing another example of the stator core 211 disposed inside the casing 100 shown in FIG. 2 .

FIG. 7 is a perspective view of the stator core 211 shown in FIG. 6 .

This embodiment is different from the above-described embodiments of FIGS. 1 to 5 in that the pole shoes 211b1 of the teeth 211b adjacent to each other in the circumferential direction are formed to be interconnected as shown in FIGS. 6 and 7 .

According to the structure of the pole shoe 211b1 as described above, it is possible to more effectively support stress that causes deformation of the teeth 211b in the process of press-fitting the stator core 211 into the inner circumferential surface of the casing 100. As a result, deformation of the stator core 211 can be minimized.

Other configurations are the same as or similar to those of the above-described embodiments of FIGS. 1 to 5 , so duplicate descriptions will be omitted.

Hereinafter, FIG. 8 is a plan view showing another example of the stator core 211 disposed inside the casing 100 shown in FIG. 2 .

FIG. 9 is a perspective view of the stator core 211 shown in FIG. 8 .

8 and 9, the slit 211d formed in the yoke 211a of the stator core 211 is the center line of the contact portion 211a1 at both ends in the circumferential direction of the contact portion 211a1 of the yoke 211a. An incision may be made toward (C1).

For example, as shown in FIG. 8 , the slit 211d includes a first cutout 211d3 cut at a first slope S1 at both ends in the circumferential direction of the contact portion 211a1 of the yoke 211a. , The contact portion 211a1 may include a second cutout 211d4 cut with a second slope S2 that is more inclined toward the radial center line C1 of the contact portion 211a1 than the first slope S1. can

An inclination angle (acute angle) between the second cutout 211d4 and the radial center line C1 is greater than an inclination angle (acute angle) formed between the first cutout 211d3 and the radial center line C1.

The length of the slit 211d may be smaller than or equal to the distance between the plurality of slits 211d adjacent in the circumferential direction. In this embodiment, the length of the slit 211d is smaller than the distance between the plurality of slits 211d.

An end of the second cutout 211d4 may be formed in a semicircular curved shape.

According to the structure of the slit 211d, deformation occurring during the process of press-fitting the stator core 211 to the inner circumferential surface of the casing 100 can be made such that most of the deformation occurs in the region where the slit 211d is formed. In other words, in most areas of the stator core 211 except for the area where the slit 211d is formed, deformation occurring when the stator core 211 is press-fitted can be minimized.

The foregoing is merely illustrative, and various modifications may be made by those skilled in the art to which the present invention belongs without departing from the scope and technical spirit of the described embodiments. The foregoing embodiments may be implemented individually or in any combination.

10: hermetic compressor 100: casing
115: refrigerant suction pipe 200: electric part
210: stator 211: stator core
211a: yoke 211a1: contact
211a2: recess 211b: tooth
211b1: pole shoe 211c: slot
211d: slit 211d1: first slit
211d2: second slit 211d3: first cutout
211d4: second cutout 212: coil
213: flat part 2131: first flat part
2132: second flat portion 214: curved groove
220: rotor 250: rotation shaft
310: first bearing 315: inlet
320: second bearing 330: compression unit
332: compression space 340: roller
350: vane 360: intermediate plate
361: soccer hole 362: suction passage

Claims (12)

casing;
a compression unit disposed in the inner space of the casing and having a compression space in which the sucked refrigerant is compressed; and
A transmission unit coupled to the compression unit by a rotating shaft and providing power to the compression unit to compress the refrigerant,
The electric part,
a stator having a stator core inserted into and fixed to an inner circumferential surface of the casing and a coil wound around the stator core; and
A rotor rotatably disposed inside the stator,
The stator core,
a yoke that forms an outer circumference of the stator core and is press-fitted to an inner circumferential surface of the casing; and
A plurality of teeth protruding from the yoke toward the center of the stator core, around which the coil is wound, and disposed spaced apart from each other in a circumferential direction;
A slot forming an empty space is provided between the teeth adjacent to each other,
The yoke is provided with a slit formed within a circumferential range of the slot,
The hermetic compressor of claim 1 , wherein the slit has a circumferential length longer than a radial width. According to claim 1,
The yoke,
a plurality of contact portions press-fitted in contact with the inner circumferential surface of the casing; and
a recess disposed between the plurality of contact portions adjacent to each other and spaced apart from an inner circumferential surface of the casing;
The contact portion is formed within a circumferential extent of the slot,
The hermetic compressor of claim 1 , wherein the slit is formed within a circumferential range of the contact portion. According to claim 2,
The slit is formed to be eccentric toward the outer circumferential surface of the yoke. According to claim 3,
A radial width of the slit is smaller than or equal to a radial width between the contact portion and the slot. According to claim 4,
The hermetic compressor of claim 1 , wherein a radial distance from the contact portion to the slit is smaller than or equal to a radial depth of the recess from the inner circumferential surface of the casing. According to claim 2,
The hermetic compressor is provided with a plurality of slits and disposed spaced apart from each other in a circumferential direction or a radial direction of the stator core. According to claim 1,
The yoke,
a plurality of contact portions press-fitted into contact with the inner circumferential surface of the casing; and
a recess disposed between the plurality of contact portions adjacent to each other and spaced apart from an inner circumferential surface of the casing;
The contact portion is formed within a circumferential extent of the slot,
The hermetic compressor is provided with a plurality of slits, and each of the plurality of slits is cut from both ends of the contact part in a circumferential direction toward a center line in a radial direction of the contact part. According to claim 7,
The plurality of slits,
A hermetic compressor formed symmetrically with respect to a radial centerline of the contact portion. According to claim 7,
Each of the plurality of slits is formed in a straight line or bent at both ends in a circumferential direction of the contact part. According to claim 7,
The hermetic compressor of claim 1 , wherein a length of each of the plurality of slits is smaller than or equal to a circumferential distance between the plurality of slits adjacent to each other. According to claim 7,
Both ends of each of the plurality of slits are formed into curved surfaces. According to claim 7,
A hermetic compressor wherein a pole shoe extends in a circumferential direction from an inner end of each of the plurality of teeth, and a plurality of pole shoes adjacent to each other in the circumferential direction are connected to each other.

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