KR102251091B1 - Electric motor and compressor having the same - Google Patents

Abstract

The present invention relates to an electric motor and a compressor having the same. The electric motor of the present invention comprises: a stator; And a rotor, wherein the stator includes a stator core and a stator coil wound around the stator core, and the stator core includes an inner core having a cylindrical inner diameter portion in which the rotor is accommodated; An outer core concentrically coupled to the outside of the inner core; A plurality of teeth protruding from one of the inner core and the outer core in a radial direction, spaced apart from each other in a circumferential direction, and coupled to the other one of the inner core and the outer core; And a tooth coupling portion formed in the mutual contact area of the tooth and the other one of the inner core and the outer core, and coupled to suppress the plurality of teeth from being spaced apart in the circumferential direction and the radial direction, respectively. It is composed. Thereby, the radial clearance and the circumferential clearance of the teeth of a stator can be suppressed.

Description

Electric motor and compressor equipped with it {ELECTRIC MOTOR AND COMPRESSOR HAVING THE SAME}

The present invention relates to an electric motor and a compressor having the same.

As is well known, an electric motor is a device that converts electrical energy into mechanical energy.

The electric motor includes a stator and a rotor rotatably provided with respect to the stator.

The stator includes a stator core in which a plurality of teeth and slots are alternately formed along a circumferential direction, and a stator coil wound around the slot.

However, in such a conventional electric motor, since the teeth of the stator are configured to have a cantilever shape supported by one side, they vibrate during operation, causing an increase in noise.

In addition, since the teeth of the stator are formed separately from each other along the circumferential direction, there is a problem in that cogging torque is generated, thereby increasing torque ripple during starting and driving.

In addition, since the teeth of the stator are formed separately from each other along the circumferential direction, there is a problem that noise due to air flow is increased when the rotor is rotated.

In consideration of the above-described problem, an electric motor has been disclosed that is manufactured by separating into an inner core and an outer core that are concentrically coupled along the radial direction of the stator core, and combines them integrally with each other.

However, in the stator of a conventional electric motor having the inner core and the outer core, after the teeth formed in either the inner core or the outer core are coupled, a clearance of the teeth occurs along the radial direction of the stator core. There is a problem that vibration and noise increase due to this.

In addition, in such a conventional electric motor, when the size of the outer diameter (outer width) of the stator core is changed, the size of the mold changes appropriately to the size of the outer diameter of the skater core, so the number of molds for manufacturing the stator core There is a problem that is increased by that much.

CN 208939677 U CN 208955755 U KR 1020030088001 A

Accordingly, an object of the present invention is to provide an electric motor capable of suppressing radial and circumferential clearance of teeth of a stator, and a compressor having the same.

In addition, another object of the present invention is to provide an electric motor capable of suppressing the occurrence of stress at a joint portion when the teeth of a stator are coupled, and a compressor having the same.

In addition, another object of the present invention is to provide a motor that can share a mold for manufacturing a stator and a compressor having the same.

The electric motor according to the present invention for solving the above-described problems is configured by dividing the stator core into an inner core and an outer core that are concentrically coupled along a radial direction, but formed on any one of the inner core and the outer core. The plurality of teeth is characterized in that the circumferential clearance and the radial clearance of the inner core are coupled so as to be suppressed, respectively.

Specifically, a plurality of teeth are formed in any one of the inner core and the outer core concentrically coupled to each other, and the plurality of teeth are formed in a mutual contact area between the other and the plurality of teeth in the radial direction and circumference of the inner core. By providing a tooth coupling portion for suppressing gaps in each direction, the occurrence of radial gaps in the plurality of teeth during operation may be suppressed.

The electric motor includes a stator; And a rotor disposed rotatably with respect to the stator, wherein the stator includes a stator core and a stator coil wound around the stator core, and the stator core has a cylindrical inner shape in which the rotor is accommodated. An inner core having a neck; An outer core concentrically coupled to the outside of the inner core; A plurality of teeth protruding from one of the inner core and the outer core in a radial direction, spaced apart from each other in a circumferential direction, and coupled to the other one of the inner core and the outer core; And a tooth coupling portion formed in the mutual contact region of the tooth and the other one of the inner core and the outer core, and coupled to prevent the plurality of teeth from being spaced apart in the circumferential direction and the radial direction. do.

The tooth coupling unit may include a circumferential clearance suppression unit for suppressing a gap between the plurality of teeth along a circumferential direction of the inner core; And a radial clearance suppression unit for suppressing a gap between the plurality of teeth in a radial direction of the inner core.

The plurality of teeth are formed on the inner diameter portion of the inner core.

At the ends of the teeth, extensions respectively extending toward both sides along the circumferential direction of the inner core are formed.

The circumferential clearance suppressing portion is configured to contact both sides of the extension portion along the circumferential direction of the inner core to suppress the circumferential clearance of the tooth.

The radial clearance suppression unit is configured to be inserted into both sides of the tooth along the radial direction of the inner core to suppress the radial clearance of the tooth.

The radial clearance inhibiting portion is configured to protrude toward the tooth from each end of the circumferential clearance inhibiting portion.

Insertion portions are respectively formed on both sides of the extension portion so that the radial clearance suppression portions can be respectively inserted.

The plurality of teeth are configured to protrude from the inner diameter surface of the outer core.

At ends of the plurality of teeth, extensions extending to both sides along the circumferential direction of the inner core are formed.

The tooth coupling portion is disposed on both sides of the extension portion along the circumferential direction of the outer core to suppress the circumferential clearance of the tooth, and on both sides of the extension portion along the radial direction of the outer core. It is arranged and configured to include a radial clearance suppression portion for suppressing the radial clearance of the tooth.

The tooth coupling portion is formed through the axial direction so that the plurality of teeth and the extension portion can be inserted in the axial direction.

The inner diameter portion is configured with shoes formed on both sides of the plurality of teeth so as to gradually decrease in width along the circumferential direction.

The shoe may be formed to have a minimum thickness (width) at which self-saturation can occur.

The electric motor is configured to further include a frame coupled to the outer surface of the outer core.

The frame is formed by rolling a magnetic bar having a bar shape in a circular shape.

The inner surface of the frame is formed to be in surface contact with the outer surface of the outer core.

A through part penetrating in the axial direction is formed between the frame and the outer core.

An uneven portion protruding and retracting along a radial direction is provided on the outer surface of the frame.

On the other hand, according to another field of the present invention, the case; A compression unit provided inside the case to compress a refrigerant; And a compressor provided inside the case and including the electric motor for providing a driving force to the compression unit.

Here, the compression unit, a cylinder having an accommodation space formed therein; A piston reciprocating within the cylinder; And a connecting rod having one end connected to the piston and the other end connected to the rotating shaft of the electric motor.

As described above, according to an embodiment of the present invention, the stator core includes an inner core and an outer core concentrically coupled to each other, a plurality of teeth formed on any one of the inner core and the outer core, and the plurality of teeth. By providing a tooth coupling portion that is coupled so that the tooth can suppress the radial play and the circumferential play, it is possible to suppress the generation of vibration and noise by suppressing the radial play of the tooth during operation.

In addition, the inner core has a ring-shaped inner diameter portion in which the rotor is rotatably accommodated, and is firmly fixed by the tooth coupling portion, so that the air gap with the rotor can be uniformly maintained.

In addition, the tooth coupling portion, a circumferential clearance suppression portion for suppressing the gap between the plurality of teeth along the circumferential direction of the inner core and a radius for suppressing the gap between the plurality of teeth along the radial direction of the inner core By providing the direction gap suppression unit, it is possible to suppress the occurrence of stress when the plurality of teeth are coupled.

In addition, the stator core further includes an inner core that is concentrically coupled and a frame coupled to the outer side of the outer core, so that a mold for forming the inner core and the outer core can be shared. Accordingly, the number of molds for manufacturing the stator core can be reduced.

1 is a cross-sectional view of a compressor equipped with an electric motor according to an embodiment of the present invention,
Figure 2 is an enlarged view of the electric motor of Figure 1,
3 is a plan view of the stator core of FIG. 2;
4 is an exploded perspective view of the stator core of FIG. 3;
5 is a plan view of the inner core of FIG. 4;
6 is a plan view of the outer core of FIG. 4;
7 is a modified example of the circumferential clearance suppression unit of FIG. 6,
Figure 8 is an enlarged view of the tooth coupling portion of Figure 6,
9 is a cross-sectional view of a compressor equipped with an electric motor according to another embodiment of the present invention;
10 is a plan view of the stator core of the electric motor of FIG. 9;
11 is an exploded perspective view of the stator core of FIG. 10;
12 is a plan view of the outer core of FIG. 11;
13 is a plan view of the inner core of FIG. 11;
14 is a cross-sectional view of a compressor equipped with an electric motor according to another embodiment of the present invention;
15 is an enlarged view of the electric motor of FIG. 14;
16 is a plan view of the stator core of FIG. 15;
17 is an exploded perspective view of the stator core of FIG. 16;
18 is a plan view of the frame of FIG. 16;
19 is a view showing a bar-shaped electrical steel plate assembly before forming the frame of FIG. 18;
20 is a plan view of the bar-shaped electrical steel plate assembly of FIG. 19;
21 is a modification example of the frame of FIG. 16;
22 is a view showing a bar-shaped electrical steel plate assembly before the frame of FIG. 21 is formed.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings. In the present specification, the same/similar reference numerals are assigned to the same/similar configurations even in different embodiments, and the description is replaced with the first description. Singular expressions used in the present specification include plural expressions unless the context clearly indicates otherwise. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the present specification is not to be construed as being limited by the accompanying drawings.

1 is a cross-sectional view of a compressor equipped with an electric motor according to an embodiment of the present invention. As shown in Fig. 1, the compressor of this embodiment is configured with a compression unit 200 and an electric motor 300.

The compressor of this embodiment has a case 110 forming an accommodation space therein. The case 110 includes, for example, a plurality of shells 111 and 112 that are vertically coupled to form a sealed accommodation space therein. A suction pipe 115 through which refrigerant is sucked is provided at one side of the case 110. A compression unit 200 for compressing a refrigerant is provided at an inner side of the case 110.

The compression unit 200 is provided, for example, in an inner upper region of the case 110. The compression unit 200 includes, for example, a cylinder 210 having an accommodation space formed therein, and a piston 240 that is accommodated in the cylinder 210 and reciprocates. One end of the connecting rod 245 is coupled to the piston 240 to enable relative movement. In this embodiment, the compression unit 200 is exemplified by a reciprocating compressor having the cylinder 210 and the piston 240, but the compression unit 200 allows relative motion to each other. It may be implemented as a scroll compressor having a fixed scroll and a revolving scroll to be combined.

A discharge valve 212 is provided on one side (right side of the drawing) of the cylinder 210. A discharge cover 214 is provided outside the discharge valve 212. A suction muffler 215 is provided on the side of the refrigerant suction passage connected to the suction pipe 115. A discharge muffler 216 is provided on the side of the refrigerant discharge passage connected to the discharge cover 214. Accordingly, generation of noise may be suppressed when the compression unit 200 is driven (refrigerant compression).

An electric motor 300 that provides a driving force to the compression unit 200 is provided on an inner side (lower side of the drawing) of the case 110. The electric motor 300 includes a stator 360 and a rotor 320 that is rotatably disposed with a predetermined air gap G with respect to the stator 360. The rotor 320 includes a rotation shaft 330 and a rotor core 340 coupled to the rotation shaft 330. The rotor core 340 is formed by insulatingly laminating a plurality of electrical steel sheets 342. The rotor 320 is configured with a plurality of permanent magnets 350 provided in the rotor core 340.

In this embodiment, the rotor 320 is exemplified by having a plurality of permanent magnets 350, but the rotor 320 is provided with a rotor core and a plurality of conductor bars coupled to the rotor core. It may also consist of a rotor. In addition, the rotor 320 may be configured as a so-called flux barrier type rotor having a rotor core and a plurality of flux barriers penetrating through the rotor core.

One region of the rotation shaft 330 is coupled to the rotor 320 and the other region extends to the compression unit 200. An eccentric portion 335 is provided at an upper end of the rotation shaft 330. The other end of the connecting rod 245 is connected to the eccentric part 335 to enable relative movement. Accordingly, when the rotation shaft 330 is rotated, one end of the connecting rod 245 pivots along the eccentric portion 335, and the other end of the connecting rod 245 is together with the piston 240. By reciprocating, the refrigerant is sucked and compressed into the cylinder 210, and the compressed refrigerant can be discharged.

An upper support part 220 is provided on the upper side of the stator 360. The upper support part 220 is provided with a bearing 225 rotatably receiving and supporting the rotation shaft 330. A plurality of lower support portions 230 supporting the stator 360 are provided below the stator 360. The plurality of lower support portions 230 includes, for example, an elastic member 232 that can expand and contract in the vertical direction and a leg portion 234 that is respectively coupled to the elastic member 232.

Oil (O) is stored in an inner lower region of the case 110. An oil guide (oil pump) 337 for guiding (pumping) the oil O upward is provided at the lower end of the rotation shaft 330. An oil supply passage 338 is formed in the rotation shaft 330 so that the oil O can be moved upward. When the rotation shaft 330 rotates, the oil (O) pumped by the oil guide 337 and moved upward along the oil supply passage 338 moves downward and cools the parts in contact with the oil (O). Or accelerate the cooling and lubrication of the exercise area.

2 is an enlarged view of the electric motor 300 of FIG. 1. As shown in FIG. 2, the rotor 320 includes a rotation shaft 330, a rotor core 340 and a permanent magnet 350. A rotation shaft hole 344 is formed through the center of the rotor core 340 so that the rotation shaft 330 can be inserted. A plurality of permanent magnet insertion portions 346 are formed through the rotor core 340 so that the permanent magnet 350 can be inserted along the axial direction. End plates 348 are provided at both ends of the rotor core 340, respectively. Thereby, it is possible to suppress the axial separation of the permanent magnet 350.

Meanwhile, the stator 360 includes a stator core 361 and a stator coil 365 wound around the stator core 361. The stator core 361 includes an inner core 370 and an outer core 410 concentrically coupled to each other.

3 is a plan view of the stator core 361 of FIG. 2, FIG. 4 is an exploded perspective view of the stator core 361 of FIG. 3, FIG. 5 is a plan view of the inner core 370 of FIG. 4, and FIG. 6 is 4 is a plan view of the outer core 410. 3 and 4, the inner core 370 includes an inner diameter portion 375 in which the rotor 320 is rotatably accommodated with a predetermined air gap G. The inner diameter portion 375 is implemented in a substantially circular ring shape. The inner core 370 is formed by insulatingly stacking a plurality of electrical steel sheets 372. The inner surface of the inner diameter portion 375 forms a rotor receiving hole 376. A plurality of teeth 380 protruding along a radial direction are formed on the outer surface of the inner core 370 (inner diameter portion 375). The plurality of teeth 380 are spaced apart at equal intervals along the circumferential direction of the inner core 370. A slot 390 is formed between the teeth 380 adjacent to each other. The teeth 380 and the slots 390 are formed alternately with each other along the circumferential direction of the inner core 370.

The inner core 370 includes shoes 377 extending along the circumferential direction on both sides of the teeth 380, respectively. The shoe 377 is formed to gradually decrease in thickness. Here, since the inner diameter of the inner core 370 (inner diameter portion 375) has the same circumference, the inner diameter portion 375 actually has an outer surface gradually increasing in thickness in a direction away from both sides of the teeth 380 It is formed to be reduced. The shoe 377 is configured to have a minimum thickness (minimum width) t along the radial direction of the inner core 370 so that magnetic flux can be saturated. Accordingly, leakage of magnetic flux through the inner diameter portion 375 may be suppressed.

The outer core 410 is concentrically coupled to the outside of the inner core 370. The outer core 410 has a circular ring shape. The outer core 410 includes a yoke 411 having a circular annular shape. The outer core 410 is formed by insulatingly stacking a plurality of electrical steel sheets 412. The inner diameter of the outer core 410 is formed to correspond to the outer diameter of the inner core 370 (actually, the outer diameter of the plurality of teeth 380). The outer core 410 is provided with an uneven portion 420 protruding and retracting along a radial direction on an outer surface of the outer core 410. The concave-convex portion 420 includes a concave portion 421 concavely retracted along a radial direction and a convex portion 422 protruding outward.

Meanwhile, the stator core 361 of the present embodiment is formed in a mutual contact area between the teeth 380 and the outer core 410, and the teeth 380 are spaced apart in the circumferential direction and the radial direction of the eater core, respectively. It is configured with a tooth coupling portion 430 that is coupled to be able to suppress it.

As shown in FIG. 5, extension portions 385 extending to both sides along the circumferential direction of the inner core 370 are formed at ends of the plurality of teeth 380. The extension part 385 is configured to have the same outer diameter, for example. The extension part 385 is configured to have the same inner diameter, for example. In this embodiment, a case in which the extension part 385 is configured to have the same thickness (thickness in the radial direction) is illustrated, but this is only an example, and the thickness may be gradually decreased along the circumferential direction.

The extension part 385 is formed to have a predetermined length from the center of the tooth 380 along the circumferential direction. An opening 395 (an opening of the slot 390) having a predetermined size is formed between the extension portions 385 adjacent to each other along the circumferential direction. Accordingly, the stator coil 365 may be wound respectively through the inside of each slot 390 by a needle (not shown) of the winding device passing through the opening 395.

6, the outer core 410 has a circular ring shape. The outer core 410 is configured to have an inner diameter corresponding to the outer diameter of the inner core 370.

On the other hand, the tooth coupling portion 430, the plurality of teeth 380 is a circumferential gap suppression unit 431 for suppressing the gap along the circumferential direction of the inner core 370; And a radial clearance suppression unit 441 for suppressing clearance of the plurality of teeth 380 along the radial direction of the inner core 370.

More specifically, the circumferential clearance suppression unit 431 is disposed on both sides of the teeth 380 along the circumferential direction of the inner core 370 to suppress the circumferential clearance of the teeth 380 It is structured.

The circumferential clearance suppressing portion 431 may be formed to be inserted into an opening between the extending portions 385 adjacent to each other. The circumferential clearance suppressing portion 431 is configured to be in contact with an end portion of the extension portion 385. Thereby, the clearance in the circumferential direction of the tooth 380 (extension part 385) can be suppressed.

The radial clearance suppression unit 441 is configured to be inserted into both sides of the teeth 380 along the radial direction of the inner core 370 to suppress the radial clearance of the teeth 380.

The radial clearance suppression unit 441 is configured to protrude from both sides of the circumferential clearance suppression unit 431, respectively. The radial clearance suppression unit 441 may be implemented as a rib 442 having a relatively thin thickness. The radial clearance suppression unit 441 is configured to include, for example, a plurality of ribs 442 disposed on both sides of the teeth 380, respectively. The radial clearance suppression part 441 is formed to be spaced apart from the inner diameter of the outer core 410 by a preset distance. Accordingly, a groove portion 445 is formed between the inner diameter surface of the outer core 410 and the radial clearance suppression portion 441, respectively.

Referring again to FIG. 5, the extension part 385 is provided with an insertion part 450 cut out so that the radial clearance suppression part 441 can be inserted. The insertion part 450 has a groove shape each of which is opened outwardly along the circumferential direction. The insertion part 450 includes an outer wall 451 disposed outside and an inner wall 452 disposed inside along the radial direction of the inner core 370. An insertion rib 455 inserted into a groove portion 445 formed between the inner diameter surface of the outer core 410 and the radial gap suppression portion 441 on the outside of the insertion portion 450 of the extension portion 385 ) Are formed respectively. The ends of each of the insertion ribs 455 are respectively in contact with the circumferential clearance suppressing portion 431, so that the circumferential clearance of the teeth 380 is suppressed, respectively.

Referring back to FIG. 4, the circumferential gap suppressing part 431, the radial gap suppressing part 441, and the insertion part 450 are provided with the inner core 370 and the outer core 410 along an axial direction. Are formed over the entire length (stacking height) of each. Accordingly, the inner core 370 and the outer core 410 are coupled to each other along the axial direction.

7 is a modified example of the circumferential clearance suppression unit of FIG. 6. As shown in FIG. 7, the circumferential clearance suppressing portions 431 ′ may be formed to be spaced apart from each other along the circumferential direction. The radial clearance suppression portions 441 may be formed to be bent from the ends of each of the circumferential clearance suppression portions 431 ′ to extend along the circumferential direction.

With this configuration, the stator 360 of the electric motor 300 of the present embodiment is opened 395 of the slot 390 of the inner core 370 before the inner core 370 and the outer core 410 are coupled. Each of the stator coils 365 may be wound inside the slot 390 in an open state. When the winding of the stator coil 365 is completed, the inner core 370 and the outer core 410 may be mutually coupled along an axial direction.

8 is an enlarged view of the tooth coupling portion 430 of FIG. 6. As shown in FIG. 8, when the inner core 370 is inserted in the outer core 410 along the axial direction, the circumferential clearance is provided in the openings 395 on both sides of the extension part 385. The restraints 431 are respectively inserted. At this time, the insertion ribs 455 formed at the outer corners of each of the extensions 385 are in contact with the radial clearance suppression section 441, so that the circumference of each extension 385 (teeth 380) Directional play can be suppressed. At the same time, the radial clearance suppression portion 441 is inserted into the insertion portion 450 formed in each of the extension portions 385, so that the outer and inner surfaces along the radial direction are the outer wall 451 and the inner surface of the insertion portion 450. By contacting the inner wall 452, respectively, the radial clearance of the teeth 380 is suppressed, respectively.

On the other hand, when the operation is started and power is applied to the stator coil 365, the magnetic field formed by the stator coil 365 and the magnetic field generated by the permanent magnet 350 interact, so that the rotor 320 It is rotated around (330). At this time, in the stator core 361, the inner core 370 and the outer core 410 are both suppressed by the tooth coupling portion 430 in the circumferential direction and the radial clearance of the inner core 370. , When the magnetic field of the stator coil 365 and the magnetic field of the permanent magnet 350 interact, noise generation due to vibration of the tooth 380 may be suppressed. In addition, since the inner diameter portion 375 of the inner core 370 is configured to have a minimum thickness t at which the magnetic flux is saturated, leakage of the magnetic flux can be suppressed. Accordingly, the magnetic flux density of the air gap G is increased, so that the torque of the rotor 320 is increased, and as a result, the output of the electric motor 300 of the present embodiment may be improved.

9 is a cross-sectional view of a compressor equipped with an electric motor according to another embodiment of the present invention. The compressor of this embodiment includes a case 110, a compression unit 200, and an electric motor 300a. The case 110 is configured to form a closed space therein. The compression part 200 is provided inside the case 110. As described above, the compression unit 200 includes a cylinder 210 and a piston 240 reciprocating within the cylinder 210. An electric motor 300a of this embodiment is provided on one side of the compression unit 200.

The electric motor 300a of this embodiment includes a stator 360a and a rotor 320, and the stator 360a includes a stator core 361a and a stator coil 365 wound around the stator core 361a. Equipped. The stator core 361a includes an inner core 370a having a cylindrical inner diameter portion in which the rotor 320 is accommodated; An outer core 410a concentrically coupled to the outside of the inner core 370a; Protruding from one of the inner core (370a) and the outer core (410a) in a radial direction and spaced apart from each other in the circumferential direction, and coupled to the other one of the inner core (370a) and the outer core (410a). A plurality of teeth 380a; And the teeth 380a, the inner core 370a, and the outer core 410a are formed in the other mutual contact area, and the plurality of teeth 380a are prevented from being spaced apart in the circumferential direction and the radial direction, respectively. It is configured to include a; tooth coupling portion (430a) that is coupled to be able to.

10 is a plan view of the stator core 361a of the electric motor 300a of FIG. 9, and FIG. 11 is an exploded perspective view of the stator core 361a of FIG. 10. As shown in FIGS. 10 and 11, the inner core 370a includes an inner diameter portion 375 in which the rotor 320 is rotatably accommodated with a predetermined air gap G. The inner core 370a is implemented in a circular ring shape. The inner core 370a is formed by insulatingly laminating a plurality of electrical steel sheets 372 having a circular ring shape. The inner core 370a includes a plurality of shoes 377 formed to gradually decrease in width along the circumferential direction on both sides of the teeth 380a. The shoe 377 is configured to have a minimum thickness t at which magnetic flux saturation occurs along the radial direction of the inner core 370a.

The outer core 410a is configured to be concentrically coupled to the outside of the inner core 370a. The outer core 410a includes a plurality of teeth 380a protruding from an inner surface toward the inner core 370a in a radial direction. The plurality of teeth 380a are formed to be spaced apart at predetermined intervals along the circumferential direction of the outer core 410a. A slot 390a is formed between the teeth 380a. The outer core 410a is configured to include teeth 380a and slots 390a that are alternately arranged with each other along the circumferential direction. The outer core 410a is formed by insulatingly laminating a plurality of electrical steel sheets 412 having the plurality of teeth 380a and slots 390a.

12 is a plan view of the outer core 410a of FIG. 11, and FIG. 13 is a plan view of the inner core 370a of FIG. 11. As shown in FIG. 12, extension portions 385a extending to both sides along the circumferential direction of the outer core 410a are formed at the ends of the teeth 380a, respectively. The extension part 385a is configured to have the same width (thickness) along the radial direction of the outer core 410a (or inner core 370a), for example. The extension part 385a may be configured to have the same inner diameter, for example. The extension part 385a may be configured to have the same outer diameter, for example. In this embodiment, the case where the extension part 385a is configured to have the same outer diameter and the same inner diameter is illustrated, but this is only an example, and the outer surface and/or the inner surface of the extension part 385a are each configured in a linear manner. May be.

The tooth coupling portion 430a is disposed on both sides of the extension portion 385a along the circumferential direction of the outer core 410a to suppress the circumferential clearance of the tooth 380a. 431a) and a radial clearance suppression portion 441a disposed on both sides of the extension portion 385a along the radial direction of the outer core 410a to suppress the radial clearance of the teeth 380a. do.

The circumferential clearance suppressing portion 431a is formed in the inner diameter portion of the inner core 370a to be in contact with both ends of the extension portion 385a.

The radial clearance suppression portion 441a is formed to contact the inner diameter portion 375 of the inner core 370a to the outer surface and the inner surface of the extension portion 385a, respectively. The radial gap suppression portion 441a includes an outer wall portion 441a1 contacting the outer surface of the extension portion 385a and an inner wall portion 441a2 contacting the inner surface of the extension portion 385a.

In the inner diameter part 375 of the inner core 370a, the circumferential gap suppressing part 431a and the radial gap suppressing part 441a are respectively formed in a groove shape penetrating in the axial direction.

Referring back to FIG. 10, the circumferential gap suppressing part 431a and the radial gap suppressing part 441a are formed to correspond to the entire axial length of the inner core 370a and the outer core 410a do.

With this configuration, the stator 360a of the electric motor 300a of the present embodiment is wound with the stator coil 365 on the outer core 410a before the inner core 370a and the outer core 410a are coupled. . When the winding of the stator coil 365 is completed, the inner core 370a is inserted and coupled to the inside of the outer core 410a in the axial direction. The extension part 385a of each tooth 380a is inserted and coupled into the tooth coupling part 430a of the inner core 370a. Accordingly, the circumferential clearance suppressing portion 431a is in contact with both ends of the extension portion 385a of the tooth 380a to suppress the circumferential clearance of the tooth 380a. The radial clearance suppression portion 441a suppresses radial clearance of the tooth 380a by contacting the outer wall portion 441a1 and the inner wall portion 441a2 with the outer and inner surfaces of the extension portion 385a, respectively. .

On the other hand, when the operation is started and power is applied to the stator coil 365, the magnetic field formed by the stator coil 365 and the magnetic field generated by the permanent magnet 350 interact, so that the rotor 320 It is rotated around (330). At this time, the stator core 361a is such that the inner core 370a and the outer core 410a are both suppressed by the tooth coupling portion 430a in the circumferential direction and the radial clearance of the inner core 370a. By being combined, vibration and noise generation can be suppressed when the magnetic field of the stator coil 365 and the magnetic field of the permanent magnet 350 interact. In addition, since the inner diameter portion of the inner core 370a is configured to have a minimum thickness t at which the magnetic flux is saturated, leakage of the magnetic flux can be suppressed. As a result, the magnetic flux density of the air gap G is increased, so that the torque of the rotor 320 is increased, so that the output may be improved.

14 is a cross-sectional view of a compressor including an electric motor according to another embodiment of the present invention, and FIG. 15 is an enlarged view of the electric motor of FIG. 14. As shown in Fig. 14, the compressor of this embodiment includes a case 110, a compression unit 200, and an electric motor 300b.

The compression unit 200 includes a cylinder 210 and a piston 240.

The electric motor 300b of this embodiment includes a stator 360b; And a rotor 320 disposed rotatably with respect to the stator 360b. The rotor 320 includes a rotation shaft 330 and a rotor core 340 coupled to the rotation shaft 330. The rotor core 340 is provided with a plurality of permanent magnets 350. The rotation shaft 330 extends to the compression unit 200. The rotation shaft 330 has an eccentric portion 335, and the other end of the connecting rod 245, one end coupled to the piston 240, is coupled to the eccentric portion 335 to enable relative motion.

The stator 360b includes a stator core 361b and a stator coil 365 wound around the stator core 361b.

The stator core 361b includes an inner core 370, an outer core 410, a plurality of teeth 380, a tooth coupling portion 430, and a frame 470.

FIG. 16 is a plan view of the stator core 361b of FIG. 15, and FIG. 17 is an exploded perspective view of the stator core 361b of FIG. 16. As shown in FIGS. 16 and 17, the inner core 370 includes an inner diameter portion 375 in which the rotor 320 is rotatably accommodated with a predetermined air gap G. The inner core 370 is formed by insulatingly stacking a plurality of electrical steel sheets 372. A plurality of teeth 380 protruding along a radial direction are formed on the outer surface of the inner core 370 (inner diameter portion). The plurality of teeth 380 are spaced apart at equal intervals along the circumferential direction of the inner core 370. A slot 390 is formed between the teeth 380 adjacent to each other. The teeth 380 and the slots 390 are formed alternately with each other along the circumferential direction of the inner core 370.

The inner core 370 includes shoes 377 extending along the circumferential direction on both sides of the teeth 380, respectively. The shoe 377 is formed to gradually decrease in thickness. The shoe 377 is configured to have a minimum thickness (minimum width) t along a radial direction at which magnetic flux can be saturated.

The outer core 410 has a circular ring shape. The outer core 410 is formed by insulatingly stacking a plurality of electrical steel sheets 412.

The stator core 361b is formed in a mutual contact area between the teeth 380 and the outer core 410, and the teeth 380 are spaced apart in the circumferential direction and the radial direction of the inner core 370, respectively. It is configured with a tooth coupling portion 430 coupled to be suppressed.

At ends of the plurality of teeth 380, extension portions 385 are formed respectively extending to both sides along the circumferential direction of the inner core 370. An opening 395 (an opening of the slot 390) having a predetermined size is formed between the extension portions 385 adjacent to each other along the circumferential direction. Accordingly, the stator coil 365 may be wound through the inside of the slot 390 using the opening 395 of each of the slots 390, respectively.

The tooth coupling portion 430 may include a circumferential clearance suppression portion 431 for suppressing a gap between the plurality of teeth 380 in the circumferential direction of the inner core 370; And a radial clearance suppression unit 441 for suppressing clearance of the plurality of teeth 380 along the radial direction of the inner core 370.

More specifically, the circumferential clearance suppression unit 431 is disposed on both sides of the teeth 380 along the circumferential direction of the inner core 370 to suppress the circumferential clearance of the teeth 380 It is structured.

The circumferential gap suppressing portion 431 may be formed to be inserted into the opening 395 between the extending portions 385 adjacent to each other. The circumferential clearance suppressing portion 431 is configured to be in contact with an end portion of the extension portion 385. Thereby, the clearance in the circumferential direction of the tooth 380 (extension part 385) can be suppressed.

The radial clearance suppression unit 441 is configured to be inserted into both sides of the teeth 380 along the radial direction of the inner core 370 to suppress the radial clearance of the teeth 380.

The extension part 385 is formed with an insertion part 450 which is cut to allow the radial clearance suppression part 441 to be inserted therein, respectively. The insertion part 450 includes an outer wall 451 disposed outside and an inner wall 452 disposed inside along the radial direction of the inner core 370. A groove portion 445 is formed between the inner diameter surface of the outer core 410 and the radial clearance suppression portion 441, respectively. Insertion ribs 455 inserted into the grooves 445 are formed outside the insertion portion 450 of the extension portion 385, respectively.

Meanwhile, a frame 470 is coupled to the outside of the outer core 410.

18 is a plan view of the frame 470 of FIG. 16. 18, the frame 470 has a substantially circular ring shape. The frame 470 is configured with a yoke or body 473 in a circular annular shape. The frame 470 is formed to be in close contact with the outer surface of the outer core 410, for example. An inner uneven portion 474 may be provided on the inner surface of the frame 470 to correspond to the uneven portion 420 of the outer core 410. The inner concave-convex portion 474 may include a concave portion 475a concave outward and a convex portion 475b protruding inward.

The outer core 410 may be inserted into the frame 470 along the axial direction. The inner surface of the frame 470 and the outer surface of the outer core 410 are in close contact with each other. The frame 470 is implemented with, for example, a magnetic material. The frame 470 may be formed by rolling a bar-shaped electrical steel plate assembly 471 in a circular shape, for example.

FIG. 19 is a view showing a bar-shaped electrical steel plate assembly of the frame 470 of FIG. 18 before forming, and FIG. 20 is a plan view of the bar-shaped electrical steel plate assembly of FIG. 19. As shown in FIG. 19, the frame 470 has a bar shape before being molded into a circular shape. The bar-shaped electrical steel sheet assembly 471 before being molded into a circular shape includes a plurality of bar-shaped electrical steel sheets 472 that are insulated and laminated in layers, as shown in FIG. 20. The plurality of bar-shaped electrical steel plates 472 may include internal irregularities 474 protruding and retracting from the inner surface. The plurality of bar-shaped electrical steel sheets may include external concave-convex portions 476 protruding and retracting from the outer surface. The external concave-convex portion includes a concave portion 477a concavely concave on the outer surface and a convex portion 477b protruding convexly outward.

With this configuration, the stator 360b of the electric motor 300b according to the present embodiment is provided with the opening 395 of the slot 390 of the inner core 370 before the inner core 370 and the outer core 410 are coupled. ), the stator coil 365 may be wound through the slot 390. When the winding of the stator coil 365 is completed, the outer core 410 is concentrically coupled to the outer side of the inner core 370 along the axial direction. Outside of the outer core 410, the cylindrical frame 470 is coupled along the axial direction. The outer surface of the outer core 410 and the inner surface of the frame 470 may be in close contact with each other by being in contact with each other. Accordingly, the bonding force of the stator core 361b may be increased. In addition, the size of the outer diameter (outer width) of the stator core 361b may be increased by that amount.

On the other hand, when operation is started and power is applied to the stator coil 365, the rotor 320 is rotated around the rotation shaft 330. At this time, the inner core 370 and the outer core 410 are spaced in the circumferential direction of the inner core 370 and the radial direction by the circumferential gap suppressing part 431 and the radial gap suppressing part 441. By suppressing all of the gaps, noise generation due to vibration of the teeth 380 may be suppressed during operation. In addition, the inner diameter portion of the inner core 370 is configured such that each shoe 377 has a minimum thickness t at which magnetic saturation occurs, and leakage of magnetic flux is suppressed, thereby increasing the magnetic flux density of the void G. The output of the electric motor 300b of this embodiment may be improved. In addition, the electric motor 300b of the present embodiment can share a motor configured with only the inner core 370 and the outer core 410 and a mold for forming the inner core 370 and the outer core 410. Because there is, it is possible to reduce the cost of manufacturing the mold.

FIG. 21 is a modified example of the frame of FIG. 16, and FIG. 22 is a view showing an electrical steel plate assembly before the frame of FIG. 21 is formed. As shown in FIG. 21, the frame 470a of the present embodiment may be configured to have a constant inner diameter.

As shown in FIG. 22, the frame 470a has a bar shape before being molded into a circular shape. The bar-shaped electrical steel plate assembly 471a before the circular shape may be formed by insulatingly laminating a plurality of bar-shaped electrical steel sheets 472a having a flat inner surface and an external concave-convex portion 476 formed on the outer surface.

With this configuration, when winding of the stator coil 365 to the inner core 370 is completed, the outer cores 410 are concentrically coupled to each other outside the inner core 370. The frame 470a is coupled to the outside of the outer core 410 along the axial direction. A through portion 480 penetrating in the axial direction is formed between the inner diameter surface of the frame 470a and the uneven portion 420 of the outer core 410. The fluid (refrigerant) on both sides of the electric motor 300b can flow through the through part 480. Accordingly, cooling of the outer core 410 and the frame 470a may be promoted by the fluid moving through the through portion 480.

In the above, it has been shown and described with respect to specific embodiments of the present invention. However, since the present invention may be implemented in various forms within a range not departing from its spirit or essential features, the embodiments described above should not be limited by the content of the detailed description.

In addition, even if the embodiments are not listed in detail in the above-described detailed description, they should be broadly interpreted within the scope of the technical idea defined in the appended claims. In addition, all changes and modifications included within the technical scope of the claims and their equivalents should be covered by the appended claims.

110: case
115: suction pipe
200: compression unit
210: cylinder
220: upper support
225: bearing
240: piston
245: connecting rod
300: electric motor
320: rotor
330: rotating shaft
340: rotor core
350: permanent magnet
360: stator
361: stator core
365: stator coil
370: inner core
375: inner neck
377: Shoe
380: Teeth
385: extension
390: slot
395: opening
410: outer core
420: irregularities
430: tooth coupling portion
431: Circumferential gap control unit
441: radial clearance suppression unit
442: rib
445: groove
450: insertion part
455: insertion rib

Claims (17)

Stator; And a rotor that is rotatably disposed with respect to the stator,
The stator includes a stator core and a stator coil wound around the stator core,
The stator core,
An inner core having a cylindrical inner diameter portion in which the rotor is accommodated;
An outer core concentrically coupled to the outside of the inner core;
A plurality of teeth protruding outward of the inner diameter portion along a radial direction of the inner core, spaced apart from each other along a circumferential direction, and having extension portions respectively extending to both sides along a circumferential direction at an end thereof;
A circumferential clearance suppression unit disposed on both sides of the extension portion along a circumferential direction to suppress circumferential clearance of the plurality of teeth; And
It is provided on both sides of the extension portion, the radial clearance suppression portion for suppressing the radial clearance of the extension portion; and,
The inner diameter of the outer core is formed to correspond to the outer diameter of the plurality of teeth so that the plurality of teeth can be inserted,
Openings are respectively formed between the extensions adjacent to each other along the circumferential direction,
The circumferential clearance restraining portions are protruded from the inner surface of the outer core in a radial direction and are respectively inserted into the openings formed between adjacent extension portions,
The radial clearance suppression portion protrudes from both sides of the circumferential clearance suppression portion along the circumferential direction and is inserted into the extension portion, respectively, and the radial clearance suppression portion is inserted in a groove shape that is respectively open to the side of the extension An electric motor inserted into each part. delete delete The method of claim 1,
An electric motor in which an insertion portion cut out so that the radial clearance suppression portion can be inserted is formed in the extension portion. The method of claim 4,
The radial clearance suppression part is spaced apart from the inner diameter surface of the outer core,
An electric motor having a groove portion formed between the radial clearance suppression portion and the inner diameter surface of the outer core. The method of claim 5,
An electric motor having an insertion rib formed at the extension portion so as to be inserted into the groove portion. The method of claim 1,
The extension part is an electric motor formed to have the same inner diameter. The method of claim 1,
The extension part is an electric motor formed to have the same thickness. The method of claim 1,
The inner diameter portion, the electric motor having a shoe formed to gradually decrease in width along the circumferential direction on both sides of the plurality of teeth. The method of claim 9,
The shoe is an electric motor that is formed to have a minimum thickness at which self saturation can occur. The method of any one of claims 1, 4 to 10,
An electric motor further comprising a frame coupled to an outer surface of the outer core. The method of claim 11,
The frame is an electric motor formed by rolling a magnetic bar having a bar shape in a circular shape. The method of claim 12,
The inner surface of the frame is formed to be in surface contact with the outer surface of the outer core. The method of claim 12,
An electric motor having a through part penetrating in the axial direction between the frame and the outer core. The method of claim 12,
An electric motor having an uneven portion protruding and retracting along a radial direction on the outer surface of the frame. case;
A compression unit provided inside the case to compress a refrigerant; And
A compressor provided with an electric motor of any one of claims 1, 4 to 10, which is provided inside the case and provides a driving force to the compression unit. The method of claim 16,
The compression unit,
cylinder;
A piston reciprocating within the cylinder; And
Compressor having a; one end is connected to the piston and the other end is a connecting rod connected to the rotating shaft of the electric motor.

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