Motor for compressor and compressor comprising same

Abstract

The invention provides a motor for a compressor and a compressor comprising the same. A rotor core of a motor for a compressor according to one aspect of the present invention comprises a plurality of mounting grooves in which a plurality of magnets are respectively mounted, and a plurality of protrusions protruding radially outward between the plurality of mounting grooves, the protrusions being configured from both side surfaces extending radially outward and an outer peripheral surface connecting the both side surfaces in the circumferential direction. The magnet is formed by four surfaces extending in the axial direction and composed of an inner surface facing the inner side in the radial direction, an outer surface opposite to the inner surface and facing the outer circumferential surface of the rotor, and two side surfaces connecting the inner surface and the outer surface, the magnet slides in the axial direction between adjacent protrusions among the plurality of protrusions, the inner surface of the magnet is arranged in the arrangement groove, and the outer surface of the magnet is arranged in the arrangement groove. At least a portion of a side surface of the magnet is in contact with a side surface of the protrusion, the side surface of the magnet extends further outward in the radial direction than the side surface of the protrusion and protrudes, and a fixing member is formed in at least a portion of an outer peripheral surface of the protrusion in the radial direction.

Description

Technical Field

[0001] The present invention relates to a compressor motor and a compressor including the same, and more particularly to a compressor motor for improving back electromotive force and a compressor including the same. Background Art

[0002] Generally, a compressor is a device that receives power from a power generating device such as a motor or a turbine and compresses a working fluid such as air or a refrigerant. Specifically, compressors have been widely used in the entire industry or home appliances, especially in vapor compression refrigeration cycles (hereinafter referred to as "refrigeration cycles"), etc.

[0003] According to the way of compressing refrigerant, this compressor can be divided into reciprocating compressor (Reciprocating compressor), rotary compressor (Rotary compressor) and scroll compressor (Scroll compressor).

[0004] A reciprocating compressor is a compressor that forms a compression space between a piston and a cylinder, and compresses the fluid by the linear reciprocating motion of the piston; a rotary compressor is a compressor that compresses the fluid by a roller that rotates eccentrically inside a cylinder; and a scroll compressor is a compressor that compresses the fluid by a pair of spiral scrolls that mesh and rotate.

[0005] A reciprocating compressor is a type of compressor in which a motor rotor is coupled to a crankshaft, the crankshaft is coupled to a connecting rod, and a piston coupled to the connecting rod performs linear reciprocating motion inside a cylinder to compress a refrigerant.

[0006] Recently, among reciprocating compressors, the use of linear compressors that do not use a crankshaft but use linear reciprocating motion is gradually increasing. As for linear compressors, since there is less mechanical loss when converting rotational motion into linear reciprocating motion, it has the advantages of improved compressor efficiency and simpler structure.

[0007] Fig.18 is a cross-sectional view of a motor according to the prior art.

[0008] Reference Fig.18 A conventional reciprocating compressor uses an IPM (Interior Permanent Magnet) type motor 300 , 400 in which a magnet 420 is inserted inside a rotor 400 .

[0009] Specifically, it may include: a stator 300 including a stator 310 and a coil 320 wound around the stator 310 ; and a rotor 400 including a rotor core 410 disposed inside the stator 300 and coupled to the shaft, and a magnet 420 inserted into the rotor core 410 .

[0010] However, the IPM type motor has a problem that the motor exciting force increases but the back electromotive force decreases compared to the SPM (Surface Permanent Motor) in which the magnets are arranged on the rotor surface.

[0011] Prior art literature

[0012] Patent Document 1: Korean Publication Patent No. KR10-2015-0067898 Summary of the invention

[0013] An object of the present invention is to provide a compressor motor and a compressor including the same, which can reduce motor exciting force and increase back electromotive force.

[0014] Another problem to be solved by the present invention is to provide a compressor motor capable of reducing the manufacturing cost of a rotor and a compressor including the same.

[0015] Another problem to be solved by the present invention is to provide a compressor motor capable of compensating for product tolerance and a compressor including the same.

[0016] Another problem to be solved by the present invention is to provide a compressor motor capable of improving the space efficiency of a rotor and a compressor including the same.

[0017] Another problem to be solved by the present invention is to provide a compressor motor capable of improving the safety factor of a rotor and a compressor including the same.

[0018] Another problem to be solved by the present specification is to provide a compressor motor and a compressor including the same, which can prevent a decrease in the output of the motor by maintaining a constant gap between a magnet and a stator.

[0019] A compressor motor according to one aspect of the present invention for solving the above-mentioned problems may include: a stator; and a rotor disposed inside the stator and coupled to a shaft.

[0020] In this case, the rotor may include a rotor core formed by stacking a plurality of magnetic steel plates in the axial direction, and a plurality of magnets arranged on a radially outer side of the rotor core and spaced apart in the circumferential direction.

[0021] In addition, the rotor core may include a plurality of seating grooves in which the plurality of magnets are seated, respectively, and a plurality of protrusions protruding radially outward between the plurality of seating grooves.

[0022] In this case, the protrusion can be composed of two side surfaces extending radially outward and an outer peripheral surface connecting the two side surfaces along the circumferential direction, and the magnet is formed by four surfaces extending axially, consisting of an inner surface facing the radial inner side, an outer surface located opposite to the inner surface and facing the outer peripheral surface of the rotor, and two side surfaces connecting the inner surface and the outer surface.

[0023] The magnet can slide axially between adjacent protrusions among the plurality of protrusions, the inner surface of the magnet is arranged in the arrangement groove, and at least a part of the side surface of the magnet contacts the side surface of the protrusion.

[0024] The side surface of the magnet extends and protrudes further radially outward than the side surface of the protrusion, and a fixing member is formed in at least a portion of the radially outer side of the outer peripheral surface of the protrusion.

[0025] This can reduce the motor exciting force and increase the back electromotive force.

[0026] In addition, the reliability of the motor can be ensured by preventing the magnet from falling off the rotor.

[0027] In addition, the manufacturing cost of the rotor can be reduced.

[0028] In addition, the fixing member may be disposed radially outside the side surface of the protrusion between side surfaces of adjacent magnets among the plurality of magnets.

[0029] In addition, the side surface of the magnet may be in single-point contact with the protrusion.

[0030] Thus, the contact area between the magnet and the protrusion can be minimized, thereby preventing damage to the magnet during assembly of the rotor and improving ease of assembly of the rotor.

[0031] In addition, the spacing between the two side surfaces of the protrusion can gradually narrow as approaching the radial inner side from the single point contact area, the area between the side surface of the protrusion and the seating groove is formed in a concave shape, at least one area of ​​the two side surfaces of the magnet can gradually increase as the spacing between the two side surfaces approaches the radial inner side, the area between the inner surface of the magnet and the side surface of the magnet is formed in a convex shape toward the outside, and the concave shape of the protrusion and the convex shape of the magnet are complementary shapes.

[0032] In addition, the magnet and the protrusion are spaced apart from each other as they approach the radial inner side from the region of the single point contact.

[0033] Thereby, it is possible to improve the ease of assembling the magnet to the rotor and compensate for product tolerances.

[0034] In addition, the axial cross section of the magnet may be a trapezoidal shape, and the axial cross section of the protrusion may be an inverted trapezoidal shape.

[0035] In this case, both ends of the outer peripheral surface of the protrusion in the circumferential direction may be formed to protrude outward in the circumferential direction, and the side surface of the magnet may be in single-point contact at the protruding region of the protrusion.

[0036] Thereby, a single point contact between the magnet and the protrusion can be achieved.

[0037] In addition, as the protrusion approaches the radial inner side from the circumferential ends, the interval between the two side surfaces of the protrusion may gradually narrow.

[0038] Thereby, the space efficiency of the rotor can be improved.

[0039] In addition, the outer peripheral surface of the protrusion may include a groove that is recessed toward the radial inside.

[0040] Therefore, the safety factor of the fixing member can be improved by increasing the radial length of the fixing member.

[0041] Additionally, the groove may have a curvature in an axial cross-section.

[0042] In this case, the axial cross section of the groove may have at least two inflection points.

[0043] In addition, the radial depth of the groove may be 0.1 mm or less.

[0044] Thereby, the safety factor of the protrusion of the rotor can be ensured while ensuring the safety factor of the fixing member.

[0045] In addition, the outer peripheral surface of the protrusion may be formed to protrude in the radially outer direction.

[0046] Thereby, the safety factor of the projection can be improved.

[0047] In addition, an outer diameter of the fixing member may be larger than an outer diameter of the protrusion and smaller than an outer diameter of the magnet.

[0048] This makes it possible to prevent the output of the motor from decreasing by keeping the gap between the magnet and the stator constant.

[0049] In addition, a minimum value of a distance between adjacent magnets among the plurality of magnets divided by a width of the protrusion may be between 1.14 and 1.29.

[0050] This can increase the back electromotive force of the motor and improve the safety factor of the rotor.

[0051] In addition, the outer side surface of the fixing member may be formed to protrude radially outward.

[0052] Thereby, the safety factor of the fixing member can be improved.

[0053] In addition, the fixing member may be injection molded from a resin material.

[0054] A compressor according to one aspect of the present invention for solving the above-mentioned problems may include: a sealed container forming a sealed space; a motor disposed inside the sealed container and generating a rotational force; and a compression unit receiving the rotational force of the motor to compress a refrigerant.

[0055] According to the present specification, a compressor motor and a compressor including the same can be provided, which can reduce motor exciting force and increase back electromotive force.

[0056] Furthermore, according to the present specification, a compressor motor capable of reducing the manufacturing cost of a rotor and a compressor including the same can be provided.

[0057] In addition, according to the present specification, a compressor motor capable of compensating for product tolerance and a compressor including the same can be provided.

[0058] Furthermore, according to the present specification, a compressor motor capable of improving the space efficiency of a rotor and a compressor including the same can be provided.

[0059] Furthermore, according to the present specification, a compressor motor capable of improving the safety factor of a rotor and a compressor including the same can be provided.

[0060] Furthermore, according to the present specification, it is possible to provide a compressor motor and a compressor including the same, which can prevent a decrease in the output of the motor by maintaining a constant gap between a magnet and a stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a cross-sectional view of a compressor according to an embodiment of the present specification.

[0062] Figure 2 It is a cross-sectional view of a motor according to an embodiment of the present specification.

[0063] Figure 3 It is a three-dimensional diagram of a rotor and a fixing member according to an embodiment of the present specification.

[0064] Figure 4 It is a front view of a rotor and a fixing member according to an embodiment of the present specification.

[0065] Figure 5 1 is a top view of a rotor and a fixing member according to an embodiment of the present specification.

[0066] Figure 6 1 is a bottom view of a rotor and a fixing member according to an embodiment of the present specification.

[0067] Figure 7 yes Figure 4 A-A' cross-sectional view.

[0068] Figure 8 yes Figure 7 Magnified view of part B.

[0069] Fig. 9 4 is a cross-sectional view of a first protrusion according to an embodiment of the present specification.

[0070] Fig.10 Detailed description of the invention Figure 1 is a cross-sectional view of a first protrusion and a second magnet according to an embodiment of the present invention.

[0071] Fig.11 4 is a cross-sectional view of a first protrusion, a first magnet, a second magnet, and a fixing member according to an embodiment of the present specification.

[0072] Fig.12 1 is a graph showing the safety factor of the protrusion and the back electromotive force of the motor, which is a value obtained by dividing the distance between adjacent magnets by the minimum value of the width of the protrusion according to an embodiment of the present specification.

[0073] Figures 13 to 15 4 is a cross-sectional view of a first protrusion, a first magnet, and a second magnet according to an embodiment of the present specification.

[0074] Fig.16 FIG. 4 is a graph showing the safety factor of the protrusion according to the radial depth of the groove of the protrusion of the rotor core according to an embodiment of the present specification.

[0075] Fig.17 4 is a cross-sectional view of a first protrusion, a first magnet, and a second magnet according to an embodiment of the present specification.

[0076] Fig.18 is a cross-sectional view of a motor according to the prior art.

[0077] Description of Reference Numerals

[0078] 1: Sealed container 100: Motor

[0079] 200: compression unit 300: stator

[0080] 400: Rotor DETAILED DESCRIPTION

[0081] Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the drawings, and the same or similar components are given the same reference numerals regardless of the reference numerals, and repeated description thereof will be omitted.

[0082] In the process of describing the embodiments disclosed in this specification, if a certain constituent element is mentioned to be "connected" or "coupled" to another constituent element, it should be understood that it may be directly connected to or coupled to the other constituent element, but there may also be other constituent elements between them.

[0083] In addition, in the process of describing the embodiments disclosed in this specification, if it is determined that the specific description of the relevant known technology makes the gist of the embodiments disclosed in this specification unclear, the detailed description thereof will be omitted. In addition, it should be understood that the drawings are only provided to facilitate the understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the drawings. The present invention includes all changes, equivalents and substitutes made within the idea and technical scope of the present invention.

[0084] On the other hand, the term disclosure can be replaced by terms such as document, specification, description, etc.

[0085] Figure 1 It is a cross-sectional view of a compressor according to an embodiment of the present specification.

[0086] Reference Figure 1 The compressor of one embodiment of the present specification may include a sealed container 1, a motor 100 and a compression unit 200, but some of the components may be omitted, and additional components are not excluded.

[0087] The sealed container 1 may have the appearance of a compressor. A motor 10 and a compression unit 200 are disposed inside the sealed container 1.

[0088] The motor 100 is disposed inside the sealed container 1 and performs a rotational motion. The motor 100 may be a fixed speed motor that rotates only forward, a fixed speed motor that can rotate forward and reverse, or a variable frequency motor.

[0089] The motor 100 may include a stator 300 disposed in the cylinder 210 inside the closed container 1 , and a rotor 400 rotatably disposed inside the stator 300 .

[0090] The compression part 200 may be disposed at an upper side of the motor 100. The compression part 200 may receive the rotation force of the motor 100 and compress the refrigerant.

[0091] The compression unit 200 may include a cylinder block 210 , a crankshaft 220 , a connecting rod 230 , a piston 240 , a valve assembly 250 , a suction muffler 260 , a discharge cover 270 , and a discharge muffler 280 .

[0092] The cylinder body 210 may include a cylinder barrel 211 forming a compression space. The cylinder body 210 may be elastically supported by the closed container 1.

[0093] The crankshaft 220 may be inserted into the cylinder block 210 and supported in radial and axial directions. The crankshaft 220 may be coupled to the rotor 400 of the motor 100 and transmit a rotational force.

[0094] The connecting rod 230 may be rotatably coupled to the crankshaft 220. The connecting rod 230 may convert the rotational motion of the crankshaft 220 into a linear motion.

[0095] The piston 240 may be rotatably coupled to the connecting rod 230. The piston 240 may linearly reciprocate in the cylinder 211. The piston 240 may compress the refrigerant.

[0096] The valve assembly 250 may be coupled to the front end of the cylinder 210. The valve assembly 250 may include a suction valve and a discharge valve. The valve assembly 250 may include: a suction muffler 260 coupled to the suction side of the valve assembly 250; a discharge cover 270 coupled to the discharge side of the valve assembly 250; and a discharge muffler 280 connected to the discharge cover 270 and reducing the discharge noise of the discharged refrigerant.

[0097] In the compressor, if power is applied to the stator 300 of the motor 100, the rotor 400 can rotate together with the crankshaft 220 according to the interaction force between the stator 300 and the rotor 400, and the connecting rod 230 coupled to the pin portion 223 of the crankshaft 220 performs a gyratory motion. In this case, the following series of processes are repeated, that is, the piston 240 coupled to the connecting rod 230 compresses the refrigerant while performing a linear reciprocating motion in the cylinder 211 and discharges the refrigerant to the discharge cap 270, and the refrigerant discharged to the discharge cap 270 passes through the discharge muffler 280 and is discharged to the refrigeration cycle.

[0098] At the same time, the crankshaft 220 rotates, and the oil supply device O arranged at the lower end of the crankshaft 220 pumps the oil stored in the oil storage part of the closed container 1. The oil is sucked upward through the oil supply passage of the crankshaft 220 and supplied to each slide surface. On the other hand, a part of the oil is scattered at the upper end of the crankshaft 220 and cools the motor 100.

[0099] Here, the crankshaft 200 for sucking the oil stored in the oil storage portion of the closed container 1 to the upper side is configured as follows.

[0100] The crankshaft 220 may include: a shaft portion 221, which is combined with the rotor 400 and inserted into the supporting hole of the cylinder body 210, and is radially supported by the cylinder body 210; an eccentric mass portion 222, which is eccentrically formed in a fan-shaped or eccentric circular flange shape at the upper end of the shaft portion 221 and constitutes a plate-shaped extension portion; and a pin portion 223, which is eccentrically formed on the top surface of the eccentric mass portion 222 relative to the shaft portion 221 and allows the connecting rod 230 to be rotatably inserted with the pin portion 223.

[0101] The shaft portion 221 may be formed on an outer peripheral surface corresponding to a journal bearing surface of the support hole such that a first radial sliding bearing surface and a second radial sliding bearing surface are spaced apart by a predetermined interval.

[0102] From the lower end to the upper end of the shaft portion 221, the first oil supply passage 225a can be formed axially or slightly inclined from the axial direction, and from the upper end of the pin portion 223 to the upper part of the shaft portion 221, a second oil supply passage 225b with a specified depth can be formed axially.

[0103] The first oil supply passage 225a and the second oil supply passage 225b may not be in communication with each other.

[0104] In the middle of the first oil supply passage 225a, that is, in the portion corresponding to the lower half of the radial sliding bearing surface of the supporting hole, a first oil outflow hole 226a for guiding oil to the second radial sliding bearing surface of the crankshaft 220 can be formed, and from the first oil outflow hole 226a at a specified height, that is, almost to the end of the supporting hole, a first oil groove 226b with a specified inclination angle can be formed in a spiral shape.

[0105] An oil inlet hole connected to the second oil supply passage 225b may be formed at the end of the first oil groove 226b, and a second oil outflow hole for guiding the oil sucked upward through the second oil supply passage 225b to the outer peripheral surface may be formed in the middle of the second oil supply passage 225b, that is, the portion combined with the connecting rod 230.

[0106] The oil pumped by the oil supply device O may be sucked upward through the first oil supply passage 225a, and a portion thereof may be guided to the first oil groove 226b through the first oil outflow hole 226a.

[0107] Figure 2 It is a cross-sectional view of a motor according to an embodiment of the present specification.

[0108] Reference Figure 2 The motor 100 of an embodiment of the present specification may include a stator 300, a rotor 400, and a fixing member 430, but additional configurations are not excluded.

[0109] The stator 300 may be disposed inside the sealed container 1 . The stator 300 may include a stator 310 and a coil 320 wound around the stator 310 .

[0110] The rotor 400 may be disposed inside the stator 300. The rotor 400 may be coupled to the crankshaft 220. The rotor 400 may be disposed inside the stator 310 and include a rotor core 410 coupled to the crankshaft 220, a magnet 420 disposed on a radially outer side of the rotor core 410, and a fixing member 430 fixing the magnet 420 to the rotor core 410.

[0111] In one embodiment of the present specification, the motor 100 may be a SPM (Surface Permanent Motor) type motor in which the magnet 420 is disposed on the surface of the rotor 400. In one embodiment of the present specification, although the motor 100 is described as a six-pole nine-slot motor, it is not limited thereto.

[0112] Figure 3 It is a three-dimensional diagram of a rotor and a fixing member according to an embodiment of the present specification. Figure 4 It is a front view of a rotor and a fixing member according to an embodiment of the present specification. Figure 5 1 is a top view of a rotor and a fixing member according to an embodiment of the present specification. Figure 6 1 is a bottom view of a rotor and a fixing member according to an embodiment of the present specification. Figure 7 yes Figure 4 A-A' cross-sectional view.

[0113] Reference Figures 3 to 7 The rotor 400 of an embodiment of the present specification may include a rotor core 410 and a magnet 420 , but additional configurations are not excluded.

[0114] The rotor core 410 may be coupled to the crankshaft 220. The rotor core 410 may be disposed inside the stator 310. The rotor core 410 may be formed in a cylindrical shape. The rotor core 410 may include a seating groove 418 and a protrusion 411. The rotor core 410 may be formed by stacking a plurality of magnetic steel plates in the axial direction.

[0115] The seating groove 418 may be recessed radially inward on the outer surface of the rotor core 410 . The magnet 420 may be disposed in the seating groove 418 .

[0116] The seating groove 418 may include a plurality of seating grooves 4182, 4183, 4184, 4185, 4186, 4187 spaced apart in the circumferential direction. Each of the plurality of seating grooves 4182, 4183, 4184, 4185, 4186, 4187 may be configured with each of the plurality of magnets 422, 423, 424, 425, 426, 427.

[0117] The plurality of placement grooves 4182, 4183, 4184, 4185, 4186, 4187 may include a first placement groove 4182, a second placement groove 4183, a third placement groove 4184, a fourth placement groove 4185, a fifth placement groove 4186, and a sixth placement groove 4187. The first placement groove 4182, the second placement groove 4183, the third placement groove 4184, the fourth placement groove 4185, the fifth placement groove 4186, and the sixth placement groove 4187 may be understood to have the same shape as each other. In one embodiment of the present specification, although the number of the plurality of placement grooves 4182, 4183, 4184, 4185, 4186, and 4187 is six, it is not limited thereto, and various changes can be made according to the number of the plurality of magnets 422, 423, 424, 425, 426, and 427.

[0118] The protrusion 411 may protrude radially outward on the outer side of the rotor core 410. The protrusion 411 may include a plurality of protrusions 412, 413, 414, 415, 416, 417 disposed between a plurality of seating grooves 4182, 4183, 4184, 4185, 4186, 4187. The plurality of protrusions 412, 413, 414, 415, 416, 417 may be spaced apart in the circumferential direction. A magnet 420 may be disposed between adjacent protrusions among the plurality of protrusions 412, 413, 414, 415, 416, 417.

[0119] The plurality of protrusions 412, 413, 414, 415, 416, 417 may include a first protrusion 412, a second protrusion 413, a third protrusion 414, a fourth protrusion 415, a fifth protrusion 416, and a sixth protrusion 417. The first protrusion 412, the second protrusion 413, the third protrusion 414, the fourth protrusion 415, the fifth protrusion 416, and the sixth protrusion 417 may be understood to have the same shape as each other. In one embodiment of the present specification, although the number of the plurality of protrusions 412, 413, 414, 415, 416, and 417 is six, it is not limited thereto and may be variously changed according to the number of the plurality of magnets 422, 423, 424, 425, 426, and 427.

[0120] The magnet 420 may be disposed on the radially outer side of the rotor core 410. The magnet 420 may be disposed in the placement groove 418. The magnet 420 may slide axially between adjacent protrusions of the plurality of protrusions 412, 413, 414, 415, 416, 417 and be placed in the placement groove 418. The meaning of the axial direction in this specification may be interpreted as Figure 4 The vertical direction of the reference.

[0121] The magnet 420 may include a plurality of magnets 422, 423, 424, 425, 426, 427 spaced apart in the circumferential direction. Each of the plurality of magnets 422, 423, 424, 425, 426, 427 may be disposed in each of the plurality of seating grooves 4182, 4183, 4184, 4185, 4186, 4187.

[0122] The plurality of magnets 422, 423, 424, 425, 426, 427 may include a first magnet 422, a second magnet 423, a third magnet 424, a fourth magnet 425, a fifth magnet 426, and a sixth magnet 427. The first magnet 422, the second magnet 423, the third magnet 424, the fourth magnet 425, the fifth magnet 426, and the sixth magnet 427 may be understood to have the same shape as each other. In one embodiment of the present specification, although the number of the plurality of magnets 422, 423, 424, 425, 426, and 427 is six, the number of the plurality of magnets 422, 423, 424, 425, 426, and 427 may be changed in various ways according to the specifications of the stator 300.

[0123] No additional adhesive component such as an adhesive may be inserted between the magnet 420 and the seating groove 418. That is, the magnet 420 can be slid and seated in the seating groove 418, and since it is fixed by the fixing member 430, the magnet 420 is prevented from falling off from the rotor core 410, thereby improving the ease of assembly of the rotor 400 and improving the safety factor of the rotor 400.

[0124] The fixing member 430 can fix the magnet 420 to the rotor core 410. The fixing member 430 can surround the top surface of the rotor core 410, the bottom surface of the rotor core 410, and the surfaces of the plurality of magnets 422, 423, 424, 425, 426, 427 that are in contact with the plurality of protrusions 412, 413, 414, 415, 416, 417. The fixing member 430 can surround the radially outer side surfaces of the plurality of protrusions 412, 413, 414, 415, 416, 417, and the top and bottom surfaces of the plurality of protrusions 412, 413, 414, 415, 416, 417. That is, the fixing member 430 can surround the entire area of ​​the rotor core 410 and the magnet 420 except for the central area of ​​the top and bottom surfaces of the rotor core 410 and the surface of the magnet 420 arranged on the radial outer side.

[0125] The fixing member 430 can be double-injection molded with the rotor 400. The rotor 400 can be insert-molded inside the fixing member 430. The fixing member 430 can be injection molded. The fixing member 430 can be formed of a plastic material. The fixing member 430 can be formed of a resin material. The fixing member 430 can be formed of a polybutylene terephthalate (PBT: PolybutyleneTerephthalate) material. Thus, the magnet 420 and the rotor core 410 can be prevented from being damaged by preventing the magnet 420 disposed on the outer peripheral surface of the rotor core 410 from moving, and the magnet 420 can be prevented from falling off the rotor core 410. In addition, compared with a method of fixing the magnet 420 to the rotor core 410 by deforming it or fixing the magnet 420 to the rotor core 410 by adding a coupling component, the manufacturing cost of the motor 100 can be reduced, and the performance of the motor 100 can be prevented from being reduced. In addition, the exciting force of the motor 100 can be reduced and the back electromotive force can be increased.

[0126] Figure 8 yes Figure 7 Magnified view of part B. Fig. 9 4 is a cross-sectional view of a first protrusion according to an embodiment of the present specification. Fig.10 Detailed description of the invention Figure 1 is a cross-sectional view of a first protrusion and a second magnet according to an embodiment of the present invention.

[0127] Reference Figures 8 to 10 , the shapes of the protrusion 411, the magnet 420, and the fixing member 430 are described in detail. Although the following description takes the region where the first protrusion 412, the first magnet 422, and the second magnet 423 are arranged as an example, the rotor 400 and the fixing member 430 are applicable to the entire region.

[0128] The axial cross section of the magnet 420 may be formed in a trapezoidal shape. The magnet 420 may include four faces extending in the axial direction. The four faces of the magnet 420 may include: inner surfaces 4221, 4231 facing radially inward; outer surfaces 4223, 4233 located opposite to the inner surfaces 4221, 4231 and facing the outer circumferential surface of the rotor 400; and two side faces 4222, 4232 connecting the inner surfaces 4221, 4231 and the outer surfaces 4223, 4233. The inner surfaces 4221, 4231 of the magnet 420 may be placed in the placement groove 418. At least a portion of the side faces 4222, 4232 of the magnet 420 may contact the first face 4124 and the second face 4125 of the protrusion 411.

[0129] An axial section of the protrusion 411 may be formed in an inverted trapezoidal shape to guide the magnet 420 .

[0130] The first protrusion 412 may be disposed between the first magnet 422 and the second magnet 423. A fixing member 430 may be disposed between the first magnet 422 and the second magnet 423.

[0131] The axial cross section of the first protrusion 412 may include: a bottom surface 4126 in contact with the radially outer side surface of the rotor core 410; a first surface 4124 and a second surface 4125 extending radially outward from the bottom surface 4126; guide portions 4122 and 4123 extending from the first surface 4124 and the second surface 4125 and formed radially outward of the first protrusion 412 and at both ends of the first protrusion 412; and an outer peripheral surface 4121 connecting the guide portions 4122 and 4123 and arranged radially outward of the first protrusion 412. Here, the first surface 4124 and the second surface 4125 may be referred to as the two side surfaces of the first protrusion 412.

[0132] The guide portions 4122 and 4123 may be formed to protrude outward in the circumferential direction. Figures 8 to 10 In the embodiment, the first guide portion 4122 disposed on the left side may be formed to protrude as it approaches the left side along the circumferential outer side, and the second guide portion 4123 disposed on the right side may be formed to protrude as it approaches the right side along the circumferential outer side. The guide portions 4122 and 4123 may have a second curvature radius r2.

[0133] In this case, the first guide portion 4122 may contact the first magnet 422. The first guide portion 4122 may contact the first magnet 422 at a single point. Except for the contact point P where the first guide portion 4122 and the first magnet 422 contact, the first protrusion 412 and the first magnet 422 may not contact.

[0134] In addition, the second guide portion 4123 may contact the second magnet 423. The second guide portion 4123 may contact the second magnet 423 at a single point. Except for the contact point P where the second guide portion 4123 contacts the second magnet 423, the first protrusion 412 and the second magnet 423 may not contact.

[0135] Thus, the contact area between the magnet 420 and the protrusion 411 can be minimized, thereby preventing damage to the magnet 420 when assembling the rotor 400 and improving the ease of assembling the rotor 400 .

[0136] Reference Fig.10 In the first protrusion 412, the area between the contact point P of the second magnet 423 in single-point contact and the area adjacent to the second seating groove 4183 can be formed to be recessed toward the left inner side of the first protrusion 412, and in the second magnet 423, the area between the contact point P of the second magnet 423 in single-point contact with the first protrusion 412 and the area adjacent to the second seating groove 4183 can be formed to be convex toward the left outer side.

[0137] The second magnet 423 and the first protrusion 412 may be separated from each other as they approach the radial inner side from the contact point P of the single point contact. That is, based on the contact point P, the width of the region S between the second magnet 423 and the first protrusion 412 may gradually widen as they approach the radial inner side and downward.

[0138] Thus, it is possible to improve the ease of assembling the magnet 420 to the rotor 400 and compensate for product tolerance.

[0139] The width of the first protrusion 412 may gradually narrow as it approaches the radial inner side from the guide portions 4122 and 4123 at both ends of the circumferential direction. At least one area of ​​the two side surfaces 4222 and 4232 of the first magnet 422 and the second magnet 423 may gradually increase as the interval between the two side surfaces 4222 and 4232 approaches the radial inner side, and the area between the side surfaces 4222 and 4232 and the inner surfaces 4221 and 4231 of the first magnet 422 and the second magnet 423 may be formed to protrude outward. The concave shape of the first protrusion 412 and the convex shape of the first magnet 422 and the second magnet 423 may be complementary shapes. Thus, the space efficiency of the rotor 400 may be improved.

[0140] That is, the distance between the first surface 4124 and the second surface 4125 may decrease as it approaches the radial inside from the outer peripheral surface 4121. The distance between the first surface 4124 and the second surface 4125 may increase again as it approaches the radial inside compared to the area closest to the first magnet 422 and the second magnet 423.

[0141] The outer side surface of the fixing member 430 may be formed to protrude radially outward, thereby increasing the safety factor of the fixing member 430 .

[0142] by Figures 8 to 10 As a reference, the radially outer side may be interpreted as an upward direction, and the radially inner side may be interpreted as a downward direction.

[0143] Fig.11 4 is a cross-sectional view of a first protrusion, a first magnet, a second magnet, and a fixing member according to an embodiment of the present specification. Fig.12 1 is a graph showing the safety factor of the protrusion and the back electromotive force of the motor, which is a value obtained by dividing the distance between adjacent magnets by the minimum value of the width of the protrusion according to an embodiment of the present specification.

[0144] Reference Fig.11, the outer circumferential surface 4121 of the first protrusion 412 may be formed to be concave radially inward. The outer circumferential surface 4121 of the first protrusion 412 may have a first radius of curvature r1. Specifically, between the first magnet 422 and the second magnet 423, the width H of the central area of ​​the fixing member 430 may be greater than the width N of other areas. Thus, since the radial length of the fixing member 430 can be increased, the safety factor of the rotor 400 can be improved.

[0145] The outer diameter of the fixing member 430 may be larger than the outer diameter of the first protrusion 412 and smaller than the outer diameters of the first magnet 422 and the second magnet 423. Specifically, the side surfaces 4222 and 4232 of the first magnet 422 and the second magnet 423 may extend and protrude further radially outward than the side surfaces 4124 and 4125 of the first protrusion 412, and the fixing member 430 may be disposed in at least a portion of the radially outer side of the outer circumferential surface 4121 of the first protrusion 412, and the side surfaces 4222 and 4232 of the first magnet 422 and the second magnet 423 may protrude further radially outward than the outer circumferential surface of the fixing member 430. Thus, the output of the motor 100 may be prevented from decreasing by keeping the gap between the magnet 420 and the stator 310 constant.

[0146] Reference Fig.12 , when the value (M / L) obtained by dividing the distance M between the first magnet 422 and the second magnet 423 by the minimum value L of the width of the first protrusion 412 is greater than 1.5, the safety factor of the rotor 400 is less than 2.5, and thus the safety factor standard cannot be satisfied. Therefore, the value (M / L) obtained by dividing the distance M between the first magnet 422 and the second magnet 423 by the minimum value L of the width of the first protrusion 412 may be less than 1.5.

[0147] When the value (M / L) of the distance M between the first magnet 422 and the second magnet 423 divided by the minimum value L of the width of the first protrusion 412 is 1.14 or less, the output of the motor 100 can be reduced because the back electromotive force of the motor 100 is sharply reduced. Therefore, the value (M / L) of the distance M between the first magnet 422 and the second magnet 423 divided by the minimum value L of the width of the first protrusion 412 can be greater than 1.14.

[0148] That is, preferably, a value (M / L) of the distance M between the first magnet 422 and the second magnet 423 divided by the minimum value L of the width of the first protrusion 412 may be between 1.14 and 1.29.

[0149] When the value (M / L) of the distance M between the first magnet 422 and the second magnet 423 divided by the minimum value L of the width of the first protrusion 412 is greater than 1.29, although the rising rate does not change significantly due to the saturation of the back electromotive force of the motor 100, the safety factor of the rotor 400 will be greatly reduced.

[0150] Therefore, more preferably, the value (M / L) of the distance M between the first magnet 422 and the second magnet 423 divided by the minimum value L of the width of the first protrusion 412 is between 1.14 and 1.29. Thus, the safety factor of the rotor 400 can be increased while the back electromotive force of the motor 100 is increased.

[0151] Figures 13 to 15 4 is a cross-sectional view of a first protrusion, a first magnet, and a second magnet according to an embodiment of the present specification. Fig.16 FIG. 4 is a graph showing the safety factor of the protrusion according to the radial depth of the groove of the protrusion of the rotor core according to an embodiment of the present specification.

[0152] Reference Figures 13 to 15 The outer peripheral surface 4121 of the radially outer side surface of the first protrusion 412 may include a groove 4128 that is recessed radially inward. The axial cross section of the groove 4128 may have a curvature. The axial cross section of the groove 4128 may have at least two inflection points. Thus, the safety factor of the fixing member 430 can be increased by increasing the radial length of the fixing member 430.

[0153] Reference Fig.15 and Fig.16 When the radial depths H1 and H2 of the groove 4128 are greater than 0.1 mm, it can be seen that the safety factor of the first protrusion 412 will drop sharply. When the radial depths H1 and H2 of the groove 4128 are greater than 1 mm, the safety factor of the first protrusion 412 will be less than 2.5, and therefore the safety factor criterion cannot be met. Therefore, preferably, the radial depths H1 and H2 of the groove 4128 are less than 1 mm. More preferably, the radial depths H1 and H2 of the groove 4128 are less than 0.1 mm. In this way, the safety factor of the fixing member 430 can be ensured while ensuring the safety factor of the protrusion 411 of the rotor 400.

[0154] Fig.17 4 is a cross-sectional view of a first protrusion, a first magnet, and a second magnet according to an embodiment of the present specification.

[0155] Reference Fig.17 The outer peripheral surface 4121 of the first protrusion 412 may be formed to protrude radially outward, thereby increasing the safety factor of the first protrusion 412 .

[0156] Any of the embodiments or other embodiments described above in this specification are not mutually exclusive or different. The various constituent elements or functions of any of the embodiments or other embodiments described above in this specification can be used or combined.

[0157] This means that, for example, the A configuration described in a specific embodiment and / or drawing and the B configuration described in another embodiment and / or drawing can be combined. That is, even if the combination between the configurations is not directly described, it means that they can be combined unless it is clearly stated that they cannot be combined.

[0158] The detailed descriptions above should not be interpreted as limiting in all aspects, but should be understood as exemplary. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention fall within the scope of the present invention.

Claims

1. A motor for a compressor, wherein: include: stator; as well as The rotor is arranged inside the stator and coupled to the shaft. The rotor includes a rotor core and a plurality of magnets. The rotor core is formed by stacking a plurality of magnetic steel plates in an axial direction. The plurality of magnets are arranged on a radially outer side of the rotor core and are spaced apart in a circumferential direction. The rotor core includes a plurality of placement grooves and a plurality of protrusions, wherein the plurality of placement grooves are used to place the plurality of magnets respectively, and the plurality of protrusions protrude radially outward between the plurality of placement grooves. The protrusion is composed of two side surfaces extending radially outward and an outer peripheral surface connecting the two side surfaces along the circumferential direction. The magnet is formed of four surfaces extending in the axial direction, including an inner surface facing the inner side of the radial direction, an outer surface located opposite to the inner surface and facing the outer peripheral surface of the rotor, and two side surfaces connecting the inner surface and the outer surface. The magnet slides axially between adjacent protrusions of the plurality of protrusions, and the inner surface of the magnet is seated in the seating groove, and at least a portion of the side surface of the magnet contacts the side surface of the protrusion. The side surface of the magnet extends and protrudes further radially outward than the side surface of the protrusion, and a fixing member is formed in at least a portion of the radially outer side of the outer peripheral surface of the protrusion.

2. The compressor motor according to claim 1, wherein: The fixing member is disposed radially outside the side surface of the protrusion between side surfaces of adjacent magnets among the plurality of magnets.

3. The compressor motor according to claim 1, wherein: The side surface of the magnet is in single-point contact with the protrusion.

4. The compressor motor according to claim 3, wherein: The interval between the two side surfaces of the protrusion gradually narrows as it approaches the radial inner side from the single point contact area, and the area between the side surface of the protrusion and the seating groove is formed concavely. As the interval between the two opposite sides of the two adjacent magnets approaches radially inward, at least one area of ​​the two opposite sides of the two adjacent magnets gradually becomes larger, and the area between the inner surface of the magnet and the side surface of the magnet is formed to protrude outward. The concave shape of the protrusion and the convex shape of the magnet are complementary shapes.

5. The compressor motor according to claim 3, wherein: The magnet and the protrusion are spaced apart from each other as they approach radially inward from the region of the single point contact.

6. The compressor motor according to claim 1, wherein: The axial cross section of the magnet is a trapezoidal shape, The axial cross section of the protrusion is an inverted trapezoidal shape.

7. The compressor motor according to claim 3, wherein: Both ends of the outer peripheral surface of the protrusion in the circumferential direction are formed to protrude outward in the circumferential direction, and the side surface of the magnet is in single-point contact at the protruding area of ​​the protrusion.

8. The compressor motor according to claim 7, wherein: As the protrusion approaches radially inward from the two circumferential ends, the interval between the two side surfaces of the protrusion gradually narrows.

9. The compressor motor according to claim 1, wherein: The outer peripheral surface of the protrusion includes a groove recessed toward the radial inner side.

10. A compressor, wherein: include: A closed container forms a closed space; A motor is disposed inside the sealed container and generates a rotational force; as well as a compression unit, receiving the rotational force of the motor to compress the refrigerant, The motor is a compressor motor as described in any one of claims 1 to 17.

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