KR102155602B1 - Electric motor, permanent magnet for electric motor, compressor with electric motor and air conditioner having the same - Google Patents

Abstract

The present invention relates to a motor, a permanent magnet for the motor, a compressor having the motor and an air conditioner having the same. The permanent magnet for the motor of the present invention has a working surface on which a magnetic flux of a magnetic body works. The working surface includes: first and second side surface portions spaced apart in parallel from each other; a first sectional portion extending in the shape of a first arc from one end of one of the first side surface portion and the second side surface portion; and a second sectional portion which has one side connected to the first sectional portion, and the other side connected to one end of the other one of the first side surface portion and the second side surface portion, and is formed to have a linear shape, an elliptical arc shape, or a shape of a second arc having a radius of curvature different from the radius of curvature of the first sectional portion. The working surface on which the magnetic flux of the magnetic body works is provided with a maximum length and a maximum width, and the first sectional portion has a shape formed to be outwardly convex. Therefore, the amount of material of the magnetic body can be reduced, and vibration and noise can be suppressed.

Description

Motor, permanent magnet for motor, compressor equipped with motor, and air conditioner equipped with it {ELECTRIC MOTOR, PERMANENT MAGNET FOR ELECTRIC MOTOR, COMPRESSOR WITH ELECTRIC MOTOR AND AIR CONDITIONER HAVING THE SAME}

The present invention relates to a motor, a permanent magnet for a motor, a compressor having a motor, and an air conditioner having the same.

As is well known, a motor is a type of device that converts electrical energy into mechanical energy.

Such a motor usually includes a stator and a rotor that is rotatably provided with respect to the stator.

The stator includes a stator core having a plurality of slots and teeth, and a stator coil wound around the slot.

The rotor is configured with a rotation shaft and a rotor core that is rotated about the rotation shaft.

The rotor may be rotatably provided with a predetermined air gap outside the stator, or may be rotatably provided with a predetermined air gap inside the stator.

The motor is classified into an induction motor and a synchronous motor according to the rotation method. As is well known, the induction motor is configured to rotate the rotor by an electromagnetic induction phenomenon acting between the stator and the rotor.

As is well known, the synchronous motor is configured such that when one of the different magnetic poles of the stator and the rotor are rotated with a gap and spaced apart from each other, the other magnetic pole is rotated in the same direction and speed.

The rotor of the synchronous motor is generally configured with a rotation shaft, a rotor core rotated about the rotation shaft, and a plurality of permanent magnets provided in the rotor core.

The permanent magnet is inserted and coupled to a permanent magnet insertion portion penetrating the rotor core in the axial direction.

However, in such a conventional motor having a permanent magnet, the material of the permanent magnet is in a state of relatively insufficient resources, and the material cost is high, so that the material cost of the permanent magnet occupies a high ratio when manufacturing the motor.

In the conventional motor having a permanent magnet, when the thickness of the permanent magnet is reduced in order to reduce the material cost of the permanent magnet, the coercive force of the permanent magnet decreases, thereby deteriorating the performance.

In consideration of this point, in order to reduce the material amount of the permanent magnet without reducing the thickness of the permanent magnet, some methods have been devised to remove the edge of the permanent magnet.

Meanwhile, in a motor using such a permanent magnet, there is a problem that vibration and noise increase due to cogging torque and counter electromotive force THD (Total Harmonic Distortion) acting between the stator and the rotor.

In such conventional motors using permanent magnets, when the corners of the permanent magnets are removed asymmetrically, the effect of reducing cogging torque occurs as the corners are removed, but overall vibration and noise due to cogging torque and back EMF THD occur. There is a problem.

In addition, there is a problem that demagnetization still occurs at the corners of the permanent magnet that are not removed.

In addition, in a motor using such a conventional permanent magnet, when all four corners of the permanent magnet are removed, the material cost of the permanent magnet is reduced, but it is difficult to sufficiently reduce vibration and noise caused by cogging torque and back EMF THD. There is a problem that there is a limit.

CN105846630A CN205864083U CN205864107U

Accordingly, it is an object of the present invention to provide a motor, a permanent magnet for a motor, a compressor having the motor, and an air conditioner having the same, which can reduce the amount of material input to the magnetic material and suppress the generation of vibration and noise. .

In addition, another object of the present invention is to provide a motor capable of reducing cogging torque and back electromotive force THD, a permanent magnet for a motor, a compressor having a motor, and an air conditioner having the same.

In addition, another object of the present invention is to provide a motor having a skew shape and having a magnetic body that can be coupled and supported along the axial direction, a permanent magnet for the motor, a compressor having the motor, and an air conditioner having the same. To do.

In addition, another aspect of the present invention is to provide a motor having a skew shape and capable of coupling along the axial direction without dividing the magnetic material in the axial direction, a permanent magnet for the motor, a compressor having the motor, and an air conditioner having the same. The purpose.

In addition, another object of the present invention is to provide a motor, a permanent magnet for a motor, a compressor including a motor, and an air conditioner having the same, in which a magnetic material has a skew shape and damage can be suppressed.

In the permanent magnet for a motor according to the present invention for solving the above-described problems, a first section protruding convexly outwardly in an arc shape having a radius of curvature of less than half of the maximum width of the magnetic body at at least one end of the magnetic body It is characterized by being formed.

Specifically, a first section extending in a first arc shape from any one of the first side and the second side at at least one end of the magnetic body having a first side portion and a second side portion spaced apart from each other on both sides And a second section connecting the first section with the other of the first side and the second side, wherein the radius of curvature of the first arc is less than half of the maximum width of the magnetic body, so that the first The magnetic flux density of the end region of the magnetic material along the width direction of the magnetic material is formed to be dispersed with respect to the center of the width direction of the magnetic material by the section portion and the second section. Accordingly, when the permanent magnet for the motor is provided in the rotor and is rotatably disposed with respect to the stator, the cogging torque acting between the rotor and the stator is reduced and the back EMF THD is improved, thereby suppressing vibration and noise generation. Can be.

The permanent magnet for the motor, in the action surface of the magnetic flux of the magnetic body, the action surface, a first side surface portion and a second side surface portion spaced side by side; A first section extending in a first arc shape from one end of one of the first side and the second side; And one side is connected to the first section and the other side is connected to the other end of the first side and the second side, and a radius of curvature different from a radius of curvature of a linear, elliptical arc, or the first section. And a second section having a second circular arc shape, wherein the surface of the magnetic body has a maximum length and a maximum width, and the first section has an outwardly convex shape.

Here, the radius of curvature of the first section is formed to be less than half of the maximum width of the working surface. As a result, the center of the first arc of the first section is moved to one side compared to the center in the width direction of the magnetic body, so that the magnetic flux density of the end of the magnetic body along the width direction of the magnetic body is dispersed with respect to the center of the action surface. As a result, the cogging torque is alleviated and the back electromotive force THD is improved.

The second section is linear and is formed in contact with an arc of the first section.

The second section, the other of the first side and the second side of the inner angle is formed to be 90 degrees or more to 160 degrees or less.

The second section and the other connecting point of the first side and the second side are formed closer to the center of the magnetic body in the longitudinal direction than the connecting point of the first section and the second section.

The working surface of the magnetic body is configured to further include a third section formed to extend in a first arc shape of the first section at the other end of the first side and the second side.

The first section and the third section are formed to have the same radius of curvature.

The working surface of the magnetic body is connected to the third section, and further includes a fourth section having a linear shape, an elliptical arc, or a second arc shape of the second section.

The second section and the fourth section are linear and configured to have the same interior angles.

The second section and the fourth section are formed to be rotationally symmetric with respect to a center point of the action surface.

The height of the connection point of the second section and the second side portion is equal to the height of the center of the radius of curvature of the first section based on the top tangent line in contact with the top end of the first section, or 42% of the radius of curvature. It is formed to have an increased height.

The first section and the third section are formed to be rotationally symmetric with respect to the center point of the action surface.

The radius of curvature of the first section and the third section is formed to be less than half of the maximum width of the magnetic body, respectively.

The radius of curvature of the first section and the third section is formed to be 27 to 42% of the maximum width of the magnetic body, respectively.

The magnetic body has a width of 10 to 30 mm.

Each center of the radius of curvature of the first section and the third section is configured to move 1.65mm to 4.65mm from the center of the maximum width of the magnetic body.

The second section and the fourth section are linear, and the lengths of the second section and the fourth section are formed equal to or larger than a radius of curvature of the first section, respectively.

The total height from the horizontal center line crossing the center point of the action surface to the top tangent line in contact with the top end of the first section is a first height from the horizontal center line to the first connection point of the second section and the second side surface section. It is formed equal to the sum of the second heights from the first connection point to the top tangent line.

In addition, the second height is formed to be less than or equal to the first height, and the second height is formed to be greater than or equal to a third height from the first connection point to a second connection point to which the first section and the second section are connected. .

The first side portion and the second side portion are formed to be rotationally symmetric with respect to a center point of the action surface.

The first and second side portions are formed to be at least half of the maximum length of the magnetic body.

The area of the working surface of the magnetic body is formed to be 75% or more of an area of a rectangle in which the maximum length of the magnetic body is 2 sides and the maximum width of the magnetic body is 2 sides.

The magnetic material includes a rare earth magnet.

The magnetic material has a residual magnetic flux density of 1.2T or more.

On the other hand, according to another field of the present invention, the stator; And a rotor disposed rotatably with respect to the stator, wherein the rotor includes: a rotor core having a permanent magnet insertion portion formed therethrough in an axial direction; And a permanent magnet for the motor inserted into the permanent magnet insertion portion.

In addition, according to another field of the present invention, the case; A compression unit provided inside the case and compressing a refrigerant; And the motor disposed inside the case and providing a driving force to the compression unit.

Thereby, the cogging torque is reduced and the quiet operation of the compressor is realized by improving the back electromotive force THD.

In addition, according to another field of the present invention, an indoor unit having an indoor heat exchanger for exchanging heat with indoor air; And an outdoor unit having a compressor of claim 24 connected to the indoor heat exchanger to provide a compressed refrigerant.

Accordingly, generation of driving noise during operation of the outdoor unit of the air conditioner can be suppressed.

Further, according to another field of the present invention, an indoor unit having an indoor heat exchanger for exchanging heat with indoor air and an indoor blower fan provided at one side of the indoor heat exchanger; And an outdoor unit having an outdoor heat exchanger connected to the indoor heat exchanger, a compressor providing compressed refrigerant to the outdoor heat exchanger, and an outdoor blowing fan provided at one side of the outdoor heat exchanger, wherein the indoor blowing fan, At least one of the outdoor blowing fan and the compressor is provided with an air conditioner having the motor.

As described above, according to an embodiment of the present invention, a first section formed in a first arc shape at at least one end of a permanent magnet, and connected to the first section, and connected to a linear, elliptical arc shape, or the Since the second section having a second arc shape having a radius of curvature different from that of the first section is provided, the amount of material input to the permanent magnet can be reduced.

In addition, when applied to the rotor of the motor, generation of cogging torque is suppressed by the first section and the second section, and the back electromotive force THD is improved, so that vibration and noise generated by the cogging torque and the back electromotive force THD can be suppressed. have.

In addition, by providing the first section and the second section, and the first side and the second side are spaced side by side with a predetermined width on both sides of the magnetic body, while having a skew shape, the axial direction of the rotor Thus, the permanent magnet can be coupled to the rotor core. Accordingly, the permanent magnet can be combined with the rotor core without dividing it in the axial direction.

In addition, by providing the first section and the second section, and the first side and the second side, it has an arc shape to reduce edge formation, and the first section and the second section, and the first side section And an inner angle of each boundary region of the second side portion is increased, so that damage to the magnetic material may be suppressed.

In addition, since the radius of curvature of the first section and the third section is formed to be less than half of the maximum width of the magnetic body, when the center of the teeth of the stator and the center of the permanent magnet coincide, the radius of curvature of the first section and the third section is The center of the tooth is spaced apart from the center of the tooth, which can relieve the concentration of magnetic flux. Thereby, the cogging torque can be reduced and the back electromotive force THD can be improved.

In addition, since one end of the second section is formed in contact with the arc of the first section, damage to the magnetic material can be suppressed.

In addition, by providing the first section and the third section, the concentration of magnetic flux on the teeth of the stator can be further relaxed, and the generation of cogging torque can be further suppressed.

In addition, the first section and the third section, and the second section and the fourth section are each formed in rotational symmetry around the center point of the action surface, so that both ends (top and bottom) of the magnetic body are It is possible to further suppress the concentration of magnetic flux at the center of the tooth by being spaced apart from the center of the tooth in both directions.

1 is a perspective view of an air conditioner showing a state of use of a motor according to an embodiment of the present invention;
2 is a configuration diagram of a refrigeration cycle of the air conditioner of FIG. 1;
3 is a cross-sectional view of the compressor of FIG. 2;
Figure 4 is an enlarged view of the rotor of Figure 3,
5 is a plan view of the motor of FIG. 3;
FIG. 6 is an enlarged view of a combined state of the permanent magnet insertion part and the permanent magnet of FIG. 3 of FIG. 5;
7 is a cross-sectional view taken along line VII-VII in FIG. 6;
8 is a view showing the permanent magnet of FIG. 7;
9 to 15 are views respectively corresponding to FIG. 8 of a permanent magnet for a motor according to another embodiment of the present invention.

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 should not be construed as limiting the technical idea disclosed in the present specification by the accompanying drawings.

1 is a perspective view of an air conditioner showing a state of use of a motor according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a refrigeration cycle of the air conditioner of FIG. 1. As shown in FIG. 1, the air conditioner of this embodiment includes an indoor unit 100 and an outdoor unit 140.

The indoor unit 100 and the outdoor unit 140 are configured with a refrigeration cycle device 180 capable of changing a phase while circulating a refrigerant.

As shown in FIG. 2, the refrigeration cycle device 180 includes a compressor 230 for compressing a refrigerant, a condenser 210 for dissipating the refrigerant compressed by the compressor 230, and an expansion for depressurizing and expanding the refrigerant. It comprises an apparatus 219 and an evaporator 220 in which the refrigerant absorbs and evaporates latent heat around it. The condenser 210 may be referred to as an outdoor heat exchanger in that it is arranged to be heat-exchangable with outdoor air, and the evaporator 220 may be referred to as an indoor heat exchanger in that it is arranged to be exchangeable with indoor air.

The compressor 230, the condenser 210, the expansion device 219, and the evaporator 220 are connected in communication with each other by a refrigerant pipe 212 forming a refrigerant passage so that the refrigerant can circulate.

The compressor 230 and the condenser 210 are configured with the outdoor unit 140.

The outdoor unit 140 includes an outdoor unit case 150 forming an accommodation space therein, the compressor 230 and a condenser 210 respectively disposed inside the outdoor unit case 150, the condenser 210 and air. It is configured to include an outdoor blowing fan 215 to promote heat exchange of. The outdoor unit case 150 is provided with a suction port 152 to allow external air to be sucked. The condenser 210 and the outdoor blowing fan 215 are respectively provided at one side of the suction port 152 inside the outdoor unit case 150. The outdoor blowing fan 215 includes a fan 216 and a motor 217 for rotating and driving the fan 216 when power is applied.

The evaporator 220 is composed of the indoor unit 100. The indoor unit 100 is provided at one side of the indoor unit case 110, the evaporator 220 disposed inside the indoor unit case 110, and the evaporator 220 to exchange heat between the evaporator 220 and air. It is configured with an indoor blowing fan 225 to promote. The indoor blowing fan 225 includes a fan 226 and a motor 227 that rotates and drives the fan 226 when power is applied. The indoor unit case 110 includes a suction port 112 and a discharge port 114 so that air can be sucked and discharged. An air passage 116 is formed inside the indoor unit case 110 so that the air sucked through the inlet 112 can be moved to the outlet 114. The evaporator 220 and the evaporator 220 are respectively disposed in the internal air flow path 116 of the indoor unit case 110.

3 is a cross-sectional view of the compressor 230 of FIG. 2. As shown in FIG. 3, the compressor 230 of the present embodiment includes a case 231, a compression unit 240, and a motor 250.

The case 231 is configured to form a sealed accommodation space therein.

A compression unit 240 is provided on an inner side (lower side in the drawing) of the case 231. The compression unit 240 includes a cylinder 241 and a roller 243 that is pivotably disposed inside the cylinder 241. Although not specifically illustrated in the drawings, a vane may be provided inside the cylinder 241 to partition the inner space of the cylinder 241 while contacting the roller 243 or the cylinder 241.

An upper bearing 245 and a lower bearing 247 rotatably supporting the rotation shaft 281 of the motor 250 are provided at upper and lower sides of the cylinder 241, respectively. The cylinder 241 has a compression space of the refrigerant penetrating in the vertical direction. The roller 243 is accommodated in the compression space. The upper and lower ends of the compression space may be blocked by the upper bearing 245 and the lower bearing 247, respectively.

A suction pipe 235 through which refrigerant is sucked is connected to one side (right side of the drawing) of the cylinder 241. An accumulator 237 is connected to the suction pipe 235 in communication. The accumulator 237 is configured to provide a gaseous refrigerant into the cylinder 241. A discharge pipe 239 is provided at an upper end of the case 231 so that the refrigerant may be discharged. The accumulator 237 and the discharge pipe 239 are respectively connected to the refrigerant pipe 212 of the refrigeration cycle device 180. Thereby, the refrigerant circulated (moved) along the refrigerant pipe 212 may be sucked in, compressed, and then discharged.

A motor 250 that provides a driving force to the compression unit 240 is provided on the other side (upper side in the drawing) of the case 231.

The motor 250 is disposed above the compression unit 240. The motor 250 includes a stator 260 and a rotor 280 disposed rotatably with respect to the stator 260.

The stator 260 includes, for example, a stator core 261 and a stator coil 270 wound around the stator core 261. The stator core 261 is formed by insulatingly stacking a plurality of electrical steel sheets 263, for example. The electrical steel sheet 263 of the stator core 261 is configured in, for example, a circular annular shape. A rotor receiving hole 269 through which the rotor 280 is rotatably accommodated is formed in the center of the stator core 261.

The rotor 280 includes a rotation shaft 281, a rotor core 291 coupled to the rotation shaft 281, and a plurality of permanent magnets 350 for motors coupled to the rotor core 291.

4 is an enlarged view of the rotor 280 of FIG. 3. As shown in FIG. 4, the rotor core 291 is formed by insulatingly laminating a plurality of electrical steel sheets 293. The rotor core 291 is disposed rotatably with a predetermined air gap (G, air gap, air gap) inside the rotor receiving hole 269. A rotation shaft hole 295 is formed through the center of the rotor core 291 so that the rotation shaft 281 can be inserted. The rotor core 291 is provided with a permanent magnet insertion portion 297 penetrating in the axial direction so that the permanent magnet 350 can be inserted. End plates 310 are coupled to both ends of the rotor core 291, respectively. The end plates 310 are respectively coupled so that the permanent magnet insertion portion 297 is blocked. A balance weight 315 is provided on the end plate 310.

5 is a plan view of the motor 250 of FIG. 3, and FIG. 6 is an enlarged view of the permanent magnet insertion part 297 of FIG. 5. As shown in FIG. 5, the stator core 261 includes a plurality of slots 265 and teeth 267 formed alternately with each other along the circumferential direction. The stator coil 270 is wound around the plurality of slots 265. Each of the plurality of slots 265 and teeth 267 is composed of nine.

A plurality of permanent magnet insertion portions 297 are formed through the rotor core 291 in the axial direction so that the permanent magnet 350 can be inserted in the axial direction. The plurality of permanent magnet insertion portions 297 are formed to be spaced apart from each other at equal angles along the circumferential direction. The permanent magnet 350 and the permanent magnet insertion part 297 are each composed of six.

The permanent magnet 350 has a rectangular cross-sectional shape having a relatively thin thickness. The permanent magnet insertion part 297 is formed through the axial direction so that the permanent magnet 350 can be inserted in the axial direction. In the present embodiment, the plurality of teeth 267 and the slot 265 are each formed of 9, the permanent magnet insertion portion 297 and the permanent magnet 350 is formed of 6 examples, but this is an example But is not limited thereto.

As shown in FIG. 6, the permanent magnet insertion portion 297 is formed to have a relatively thin thickness corresponding to the cross-sectional shape of the permanent magnet 350. Flux barriers 299 are formed on both sides of the permanent magnet insertion part 297, respectively. The permanent magnet insertion portion 297 and the flux barrier 299 are configured to communicate with each other.

The permanent magnet 350 is inserted into the permanent magnet insertion part 297 in the state of the magnetic body 351 before magnetization. The magnetic body 351 of the permanent magnet 350 inserted into the permanent magnet insertion part 297 is magnetized along the thickness direction. Accordingly, different magnetic poles (N pole and S pole) are respectively formed on both plate surfaces of the magnetic body 351. Both plate surfaces of the magnetic body 351 have action surfaces 353 on which magnetic flux acts, respectively.

The flux barrier 299 is provided with a permanent magnet support part 301 in contact with the permanent magnet 350 inside the permanent magnet insertion part 297. Accordingly, the occurrence of a gap in the permanent magnet 350 can be suppressed. The permanent magnet support part 301 may be configured to include a support protrusion 303 for supporting the permanent magnet 350 by contacting a side portion of the magnetic body of the permanent magnet 350. As a result, when the magnetic body 351 of the permanent magnet 350 is inserted, the magnetic body 351 is supported by the support protrusion 303, so that a gap of the magnetic body 351 occurs when the magnetic body 351 is magnetized. This is suppressed so that the magnetization of the magnetic body 351 of the permanent magnet 350 can be accurately and stably performed. In this embodiment, a case in which the support protrusions 303 are formed in two is exemplified, but is not limited thereto.

7 is a cross-sectional view taken along the line VII-VII in FIG. 6. As shown in FIG. 7, the permanent magnet 350 (actually a magnetic body 351) is inserted into the interior of the permanent magnet insertion part 297. The permanent magnet 350 (magnetic body 351) is composed of a rare earth magnet having a relatively high residual magnetic flux density (Br) after magnetization. The residual magnetic flux density of the permanent magnet 350 is implemented to be 1.2 T (Tesla, Tesla) or more (Br≥1.2T).

The magnetic body 351 of the permanent magnet 350 has a maximum length (L) and a maximum width (W).

The magnetic body 351 includes a first side surface portion 361 and a second side surface portion 362 disposed parallel to each other.

The magnetic body 351 includes a first section 363 and a first section 363 extending in a first arc shape from one end of any one of the first side portion 361 and the second side portion 362 A second section portion 364 connecting the other of the first side portion 361 and the second side portion 362 is provided.

The working surface of the magnetic body 351 is rotationally symmetrical with the first section 363 and the second section 364 with respect to the center point O of the magnetic body 351. ) And a fourth section 366.

The maximum length (L) and maximum width (W) by the first section 363 and the second section 364 on one side (upper side) of the magnetic body 351 inside the permanent magnet insertion section 297 The upper edge regions of the rectangular magnetic body 355 with) as sides are removed to form empty spaces in which magnetic force is not generated. Accordingly, generation of cogging torque between the rotor 280 and the stator 260 is suppressed, and the back electromotive force THD is improved, so that generation of vibration and noise may be suppressed.

The magnetic body 355 of the rectangular shape described above by the third section 365 and the fourth section 366 on the other side (lower side) of the magnetic body 351 inside the permanent magnet insertion section 297 The lower edge regions of are removed to form empty spaces in which magnetic force is not generated. Accordingly, generation of cogging torque between the rotor 280 and the stator 260 is suppressed, and the back electromotive force THD is improved, thereby further suppressing the generation of vibration and noise.

8 is a view showing the permanent magnet 350 of FIG. 7. As shown in Fig. 8, the permanent magnet 350 for a motor of this embodiment has a rectangular shape, not an action surface of a rectangular magnetic body 355 having the maximum length (L) and maximum width (W) as sides. The magnetic body 351 is provided with a working surface from which the edge regions of the magnetic body 355 are removed.

The working surface 353 on one side of the magnetic body 351 may include a first side surface portion 361 and a second side surface portion 362 spaced side by side; A first section part 363 extending in a first arc shape from one end of one of the first side part 361 and the second side part 362; And one side is connected to the first section 363 and the other side is connected to the other one end of the first side section 361 and the second side section 362, and a linear, elliptical arc, or the first And a second section portion 364 having a second arc shape having a radius of curvature different from that of the section portion 363.

The working surface of the magnetic body 351 of the permanent magnet of this embodiment has a maximum length (L) and a maximum width (W). The maximum width W corresponds to the distance between the first side surface portion 361 and the second side surface portion 362.

The area (S) of the working surface of the permanent magnet of this embodiment is to have an area (S≥0.75*L*W) of 75% or more of the cross-sectional area of the rectangle having the maximum length (L) and the maximum width (W) as sides, respectively. Is composed.

The first side portion 361 and the second side portion 362 are formed to be spaced parallel to each other to correspond to the maximum width W. The first side portion 361 and the second side portion 362 are disposed along the axial direction, respectively. The first side portion 361 and the second side portion 362 are formed to be rotationally symmetric with respect to the center point O. The first side portion 361 and the second side portion 362 are respectively formed to have a length of at least half of the maximum length L of the magnetic body 351.

A first section portion 363 extending in a first arc shape having a preset radius of curvature R is formed at one end (top portion in the drawing) of the first side portion 361. The radius of curvature R of the first arc of the first section 363 is formed to be less than half (1/2) of the maximum width (R≤W/2). The first section 363 is formed such that the first side surface 361 and the first arc of the first section 363 contact each other at a contact point.

A second section 364 is formed between the first section 363 and the second side surface 362. The second section 364 is formed in a linear shape, an elliptical arc, or a second arc shape having a radius of curvature different from that of the first arc.

In this embodiment, the second section 364 is implemented in a linear fashion. The second section part 364 is formed in contact with a first arc of the first section part 363. The second section 364 is formed to have the second side surface 362 and an inner angle θ of 90 degrees or more and 160 degrees or less.

The first connection point P1 where the second section 364 and the second side surface 362 are connected is at a contact point C1 where the first section 363 and the first side surface 361 are in contact. In comparison, the magnetic body 351 is formed close to the center of the magnetic body 351 in the longitudinal direction (horizontal center line LC _H ).

In this embodiment, the height of the connection point P1 between the second section 364 and the second side section 362 based on the top tangent line in contact with the top end of the first section 363 is the first section It is configured to have a height equal to the height of the center of the radius of curvature R of the portion 363 or a height increased by 42% compared to the radius of curvature R. Here, the uppermost tangent line corresponds to the upper side (line segment ab) of a rectangle formed with the maximum length L and the maximum width W as sides.

The working surface of the magnetic body 351 further includes a third section part 365 extending in a first arc shape of the first section part 363 at the other end (lower part of the drawing) of the second side part 362. It is equipped and configured.

The first section 363 and the third section 365 are configured to have the same radius of curvature R. In the present embodiment, a case in which the first section 363 and the third section 365 are configured to have the same radius of curvature R is illustrated, but this is only an example and is not limited thereto.

The first section 363 and the third section 365 are formed to be rotationally symmetric with respect to the center point O of the action surface. Since the radius of curvature R of the third section 365 is the same as the radius of curvature R of the first section 363, it is formed to be less than half of the maximum width W.

Here, the radius of curvature R of the first section 363 and the third section 365 is formed to be, for example, 27 to 42% of the maximum width W of the magnetic body 351.

Each center of the radius of curvature (R) of the first section (363) and the third section (365) is the center of the maximum width (W) of the magnetic body 351 (from 1.65mm to 4.65 from the vertical center line (LC _H )) Each is configured to be moved in the mm range.

The working surface of the magnetic body 351 is connected to the third section part 365 and has a linear, elliptical arc, or a fourth section part 366 having a second arc shape of the second section part 364. It is further provided and configured.

The fourth section 366 is formed in a linear shape.

Here, the second section 364 and the fourth section 366 are formed to be rotationally symmetric with respect to the center point O of the action surface.

The lengths of the second section 364 and the fourth section 366 are, for example, equal to or more than the radius of curvature R of the first section 363 and the third section 365 It can be largely formed.

Non-magnetic flux sections in which magnetic flux is not generated are formed on both sides (upper and lower sides of the drawing) of the permanent magnet (magnetic body 351). Here, the non-magnetic flux section is formed in each of the four corner regions of a rectangle having a maximum length L and a maximum width W of the magnetic body 351 as sides. In the permanent magnet 350 for a motor of the present embodiment, the amount of material input of the magnetic body 351 may be reduced as much as corresponding to the non-magnetic section. Accordingly, the manufacturing cost of the permanent magnet 350 may be reduced by that much.

According to this configuration, when the vertical center line LC _V of the magnetic body 351 is arranged to coincide with the center of the tooth 267, the first section 363 and the third section of the magnetic body 351 Each center of the radius of curvature R of 365 is spaced apart from the center of the tooth 267. As a result, the magnetic force generated in the permanent magnet 350 is not concentrated in the center of the tooth 267 and is dispersed, thereby suppressing the generation of cogging torque and improving the back electromotive force THD to improve the vibration caused by the cogging torque and the back electromotive force THD And noise generation can be suppressed.

The present inventors believe that the cogging torque of the motor 250 of this embodiment is 0.017 Nm, and a permanent magnetic body 355 in a rectangular shape having the maximum length (L) and maximum width (W) of the magnetic body 351 as each side. It was confirmed that the cogging torque of the motor 250 including the magnet was significantly reduced to about 80% compared to 0.084 Nm. This difference in cogging torque is reflected in the back electromotive force THD, and the back electromotive force THD of the motor 250 of this embodiment is 1.9% compared to 3.4% of the back electromotive force THD of the motor having a permanent magnet having the rectangular magnetic body 355, which is about 44. % Significantly decreased. In particular, it was confirmed that the fifth and seventh harmonics of the permanent magnet 350 of the present embodiment are significantly reduced compared to the permanent magnet having the rectangular magnetic body 355.

On the other hand, the total height (H) of the horizontal center line (LC _H) transverse to the center point (O) of the working face to contact with the top tangent to the top of the first section part 363 is in the horizontal center line (LC _H) A first height h1 between the second section 364 and the second side portion 362 from the first connection point P1 and the second height from the first connection point P1 to the top tangent line It is configured to be equal to the sum of (h2) (H=h1+h2).

The second height h2 is formed to be less than or equal to the first height h1, and the second height h2 is the first section 363 and the second section from the first connection point P1 It is formed to be greater than or equal to the third height h3 up to the second connection point P2 to which the 364 is connected.

The maximum width W of the magnetic body 351 may be 10 to 30 mm.

More specifically, for example, the maximum length (L) of the magnetic body 351 is 50.5 mm, the maximum width (W) is 20.5 mm, and the first section 363 and the third section 365 The radius of curvature R may be formed to be 8.6mm. The lengths of the first side portion 361 and the second side portion 362 may be 29.7 mm, respectively. The inner angle θ of the second section 364 and the fourth section 366 may be 151 degrees. At this time, the area (S) of the working surface of the magnetic body 351 is formed to be 88% of the area of the rectangle having the maximum length (L) and maximum width (W) of the magnetic body 351 as sides, respectively. do.

Here, the radius of curvature R of the first section 363 and the third section 365 is 8.6 mm, the maximum width W is 20.5 mm, and the maximum length L of the magnetic body 351 is When reducing to 39.4 mm, the lengths of the first side portion 361 and the second side portion 362 are respectively reduced to 18.6 mm to form an action surface, the area of the action surface of the magnetic body 351 is the magnetic body ( It may be formed as 85% of the area of the magnetic body 355 of a rectangular shape formed by the maximum length (L) and the maximum width (W) of 351.

With this configuration, when a driving signal is input through the indoor unit 100, power is applied to the motor 250 of the compressor 230. When power is applied to the stator 260 of the motor 250, the magnetic field formed by the stator coil 270 and the magnetic field formed by the permanent magnet 350 interact with each other, so that the rotor 280 becomes the rotating shaft ( 281). At this time, each permanent magnet 350 of the rotor 280 is a vertical center line (LC _V ) of the permanent magnet 350 by the first section 363 to the fourth section 366 is the tooth ( 267), the centers of the radius of curvature R of the first section 363 and the third section 365 are respectively spaced from the center of the tooth 267, so magnetic force As this is dispersed, generation of cogging torque is suppressed, and the back electromotive force THD can be improved. Accordingly, generation of vibration and noise during operation of the compressor 230 may be remarkably suppressed, and the operation noise of the outdoor unit 140 may be significantly reduced.

In this embodiment, a case where the permanent magnet 350 for a motor of the present invention is applied to the motor 250 of the compressor 230 is described as an example, but the permanent magnet 350 for a motor of the present invention is It may be applied to the motor 227 of the blowing fan 225 and the motor 217 of the outdoor blowing fan 215, respectively. Accordingly, when the indoor ventilation fan 225 is driven, the generation of cogging torque is suppressed, the back electromotive force THD is improved, and generation of vibration and noise may be suppressed. In addition, when the outdoor unit 140 is driven, vibration and noise of the compressor 230 are suppressed, and when the outdoor blowing fan 215 is driven, the generation of cogging torque is suppressed, and the back electromotive force THD is improved. When the outdoor blowing fan 215 is driven, generation of vibration and noise may be suppressed.

Hereinafter, a permanent magnet for a motor according to another embodiment of the present invention will be described with reference to FIGS. 9 to 15.

9 to 15 are views respectively corresponding to FIG. 8 of a permanent magnet for a motor according to another embodiment of the present invention. As shown in Fig. 9, the permanent magnet 350a for a motor according to the present embodiment includes magnetic bodies 351a having working surfaces formed on both sides thereof.

The magnetic body 351a may have a first side surface portion 361a and a second side surface portion 362a disposed side by side and spaced apart from each other; A first section part 363a extending in a first arc shape from one end of one of the first side part 361a and the second side part 362a; And one side is connected to the first section 363a, and the other side is connected to the other end of the first side portion 361a and the second side portion 362a, and a linear, elliptical arc, or the first And a second section 364 having a second arc shape having a radius of curvature R different from that of the section 363a.

The working surface of the magnetic body 351a has a maximum length (L) and a maximum width (W).

The first section 363a is formed at one end (upper part of the drawing) of the first side part 361a.

The first section 363a is formed to be convex outwardly in a first arc shape having a preset radius of curvature R.

The radius of curvature R of the first section 363a is formed to be less than half of the maximum width W of the magnetic body 351a.

A third section portion 365a having the same radius of curvature R as the first section portion 363a is formed at the other end (lower end of the drawing) of the second side portion 362a.

The first section 363a and the third section 365a are formed to be rotationally symmetric around a center point O of the action surface of the magnetic body 351a.

On the other hand, the second section 364a is formed in the shape of an elliptical arc, one part of the ellipse. One end of the second section 364a is connected to the first section 363a, and the other end is connected to one end (top in the drawing) of the second side surface 362.

The first section 363a and the second section 364a may be configured to be in contact with each other at a contact point C2 in contact with an uppermost end of the first section 364a.

Here, a connection point P1 between the second section 364 and the second side portion 362 is at a connection point C1 where the first section 363 and the first side section 361 are connected. In comparison, it may be formed closer to the horizontal center line LC _H of the magnetic body 351a. The second section 364a is arranged in an elliptical arc shape inclined from the upper end of the first section 363 toward the second side surface 362. The ellipse of the second section 364a is disposed so that its long axis is inclined downward to the right with respect to the width direction of the magnetic body 351a.

A fourth section 366a having the same elliptical arc shape as the second section 364a is formed at the other end of the first side portion 361a.

A connection point between the first side portion 361a and the fourth section portion 366a is compared to a connection point C3 at which the third section portion 365a and the second side portion 362a are connected. ) May be disposed close to the horizontal center line (LC _H ).

Accordingly, the fourth section part 366 is arranged in an elliptical arc shape inclined upwardly from one end of the third section part 365 toward the first side surface part 361.

Here, the radius of curvature R of the first section 363a and the third section 365a is formed to be less than half of the maximum width W of the magnetic body 351a.

The area of the working surface of the magnetic body 351a is formed to be 75% or more of the area of the rectangular magnetic body 355 having the maximum length (L) and maximum width (W) as sides.

According to this configuration, the upper and lower ends of the permanent magnet 350a are formed by the first section 363a and the second section 364a, and the third section 365a and the fourth section 366a. Concentration of the magnetic force at the center of the tooth 267 is suppressed, whereby the generation of cogging torque is reduced and the back electromotive force THD is improved, thereby suppressing the generation of vibration and noise.

As shown in FIG. 10, the permanent magnet 350b for a motor of this embodiment includes magnetic bodies 351b having working surfaces formed on both sides thereof.

The working surface of the magnetic body 351b may include a first side surface portion 361b and a second side surface portion 362b spaced side by side; A first section portion 363b extending in a first arc shape from one end of one of the first side portion 361b and the second side portion 362b; And one side is connected to the first section 363b, and the other side is connected to the other end of the first side portion 361b and the second side portion 362b, and is a linear, elliptical arc, or the first And a second section portion 364b having a second arc shape having a radius of curvature R different from the radius of curvature R of the section portion 363b.

A first arc-shaped first section 363b having a preset radius of curvature R is formed to extend outwardly and convexly at an upper end of the first side portion 361b.

The radius of curvature R of the first section 363b is formed to be less than half of the maximum width W of the magnetic body 351b.

A third section portion 365b having the same radius of curvature R as the first section portion 363b is formed at a lower end of the second side portion 362b.

The first section 363b and the third section 365b are formed to be rotationally symmetric with respect to the center point O of the action surface of the magnetic body 351b.

The radius of curvature R of the first section 363b and the third section 365b is formed to be less than half of the maximum width W of the magnetic body 351b.

Meanwhile, the second section 364b is formed in a linear shape. The second section 364b and the second side surface 362b have, for example, an inner angle θ of 90 degrees.

A connection point P1 between the second section 364b and the second side surface 362b is formed to be spaced apart from a predetermined distance from an uppermost tangent line in contact with the uppermost end of the first section 363b.

A fourth section 366b connected to the third section 365b is connected to a lower end of the first side portion 361b.

The fourth section 366b is formed in a linear shape.

The fourth section 366b is formed to be rotationally symmetric with the second section 364b based on the center point O of the magnetic body 351b.

According to this configuration, when the permanent magnet 350b for a motor of the present embodiment is disposed so that the center of the vertical center line LC _V and the tooth 267 are aligned, both ends (upper and upper ends of the permanent magnet 350b) Since the magnetic force generated at the bottom) is suppressed from being concentrated in the center of the tooth 267, the occurrence of cogging torque is reduced, and the back electromotive force THD is improved. Thereby, generation of vibration and noise can be suppressed.

As shown in FIG. 11, the permanent magnet 350c for a motor of this embodiment includes magnetic bodies 351c having working surfaces formed on both sides thereof.

The working surface of the magnetic body 351c may include a first side surface portion 361c and a second side surface portion 362c spaced side by side; A first section part 363c extending in a first arc shape from one end of one of the first side part 361c and the second side part 362c; And one side is connected to the first section part 363c, and the other side is connected to the other end of the first side part 361c and the second side part 362c, and a linear, elliptical arc, or the first And a second section portion 364c having a second arc shape having a radius of curvature R different from the radius of curvature R of the section portion 363c.

The first section 363c is formed to be convex outwardly at an upper end of the first side surface 361c.

The radius of curvature R of the first section 363c is formed to be less than half of the maximum width W of the magnetic body 351c.

The second section 364c is formed in a linear shape.

A third section 365c is formed on the second side surface 362c so as to be rotationally symmetrical with respect to the center point O of the first section 363c and the magnetic body 351c.

A fourth section 366c is formed in the third section 365c in rotational symmetry with respect to the center point O of the magnetic body 351c.

On the other hand, the connection point (P1) between the second section (364c) and the first side (361c) of the permanent magnet (350c) for a motor of this embodiment is the top tangent line in contact with the top end of the first section (363). The first section 363 and the first side surface 361 are configured to have the same height as the height of the connection point C1 to which the first section 363 and the first side surface 361 are connected.

On the contrary, the connection point P3 between the fourth section part 366c and the first side part 361c is the third section part 365 based on the lowest tangent line in contact with the lowermost end of the third section part 365. ) And the second side portion 362 is configured to have the same height as the height of the connection point C3.

According to this configuration, when the permanent magnet 350c for the motor of the present embodiment is disposed so that the center of the vertical center line LC _V and the tooth 267 are aligned, both ends (top and top and bottom) of the permanent magnet 350c Since the magnetic force generated at the bottom) is suppressed from being concentrated in the center of the tooth 267, the occurrence of cogging torque is reduced, and the back electromotive force THD is improved. Thereby, generation of vibration and noise can be suppressed.

As shown in FIG. 12, the permanent magnet 350d for a motor of the present embodiment is configured with magnetic bodies 351d having working surfaces formed on both sides thereof.

The magnetic body 351d may have a first side surface portion 361d and a second side surface portion 362d disposed side by side and spaced apart from each other; A first section part 363d extending in a first arc shape from one end of one of the first side part 361d and the second side part 362d; And one side is connected to the first section 363d and the other side is connected to the other end of the first side 361d and the second side 362d, and is connected to a linear, elliptical arc, or the first And a second section portion 364d having a second arc shape having a radius of curvature R different from that of the section portion 363d.

The magnetic body 351d has a maximum length (L) and a maximum width (W).

The first section 363d is formed to be convex outwardly on the upper end of the first side surface 361d.

The radius of curvature R of the first section 363d is formed to be less than half of the maximum width W of the magnetic body 351d.

The second section 364d is formed in a linear shape.

A third section portion 365d having the same radius of curvature R as the first section portion 363d is formed at a lower end of the second side portion 362d.

The linear fourth section 366d is formed in the third section 365d.

The first section 363d and the third section 365d are formed to be rotationally symmetric with respect to the center point O of the action surface of the magnetic body 351d.

The second section 364d and the fourth section 366d are formed to be rotationally symmetric with respect to the center point O.

Meanwhile, the first side portion 361d and the second side portion 362d may be configured to have a significantly reduced length compared to the maximum length L of the magnetic body 351d.

The upper end of the first side surface portion 361d and the lower end of the second side surface portion 362d may be formed to be in contact with the horizontal center line LC _H of the magnetic body 351d.

The second section 364d and the fourth section 366d are configured to have a relatively small interior angle θ, so that the lengths of the first and second side portions 361d and 362d are relatively small. It can be formed small. As a result, a magnetic flux section having a relatively large area is formed above and below the magnetic body 351d of the present embodiment. Here, the non-magnetic flux section refers to four corner regions in which magnetic flux is not generated based on the rectangular magnetic body 355 having the maximum length and the maximum width W of the magnetic body 351d as sides.

In this embodiment, the working surface of the magnetic body 351d may be formed as 75% of the area of the rectangular magnetic body 355 having the maximum length (L) and maximum width (W) of the magnetic body 351d as sides. have.

Thereby, the amount of material input to the magnetic body 351d of the permanent magnet 350d for the motor can be reduced by up to 25%. In addition, the manufacturing cost of the permanent magnet 350d for the motor may be reduced that much.

More specifically, the maximum length (L) of the working surface of the magnetic body (351d) is 24.5 mm, the maximum width (W) is 20.5 mm, and the lengths of the first and second side surfaces 361 and 362 are 3.7 mm. Each can be formed as.

According to this configuration, the motor 250 provided with the permanent magnet 350d for the motor of the present embodiment has magnetic force generated at both ends (upper and lower ends) of the permanent magnet 350d, and the teeth 267 of the stator 260 ) Is reduced in the center of gravity, the generation of cogging torque is reduced, and the back electromotive force THD is improved, so that vibration and noise generation can be suppressed when the motor 250 is driven.

As shown in FIG. 13, the permanent magnet 350e for a motor according to the present embodiment includes magnetic bodies 351e on both sides of which magnetic flux action surfaces are respectively formed.

The working surface of the magnetic body 351e may include a first side surface portion 361e and a second side surface portion 362e that are spaced apart from each other in parallel; A first section part 363e extending in a first arc shape from one end of one of the first side part 361e and the second side part 362e; And one side is connected to the first section 363e, and the other side is connected to the other end of the first side 361e and the second side 362e, and is connected to a linear, elliptical arc, or the first And a second section 364e having a second arc shape having a radius of curvature R different from that of the section 363e.

At an upper end of the first side surface portion 361e, the first section portion 363e extends in an arc shape to be convex outward. The radius of curvature R of the first section 363e is formed to be less than half of the maximum width W of the magnetic body 351e.

A third section portion 365e that is rotationally symmetric with the first section portion 363e is formed to be convex outwardly at a lower end of the second side portion 362e.

A linear second section 364e is formed to be connected to the first section 363e.

A linear fourth section 366e is formed to be connected to the third section 365e.

Meanwhile, in the present embodiment, the second section 364e and the fourth section 366e may have a relatively small inner angle θ.

More specifically, the permanent magnet 350e for a motor of this embodiment has a maximum length (L) of 24.5 mm and a maximum width (W) of 20.5 mm compared to the permanent magnet for a motor of the embodiment of FIG. 12, but the first The side portions 361e and the second side portions 362e have a length of 11.5 mm, which is relatively large.

The cross-sectional area of the permanent magnet 350e for a motor according to the present embodiment is 84% of the area of the rectangular magnetic body 355 having the maximum length L and the maximum width W as sides. Accordingly, the input amount of the material of the magnetic body 351e can be reduced by up to 16%, and the manufacturing cost of the permanent magnet 350e can be reduced that much.

As shown in Fig. 14, the permanent magnet 350f for a motor according to the present embodiment includes magnetic bodies 351f on both sides of which magnetic flux action surfaces are respectively formed.

The working surfaces of the magnetic body 351f may include a first side surface portion 361f and a second side surface portion 362f disposed side by side and spaced apart; A first section part 363f extending in a first arc shape from one end of one of the first side part 361f and the second side part 362f; And one side is connected to the first section 363f, and the other side is connected to the other end of the first side section 361f and the second side section 362f, and a linear, elliptical arc, or the first And a second section portion 364f having a second arc shape having a radius of curvature R different from that of the section portion 363f.

The first section portion 363f is formed to extend in an arc shape to be convex outwardly at one end (top of the drawing) of the first side portion 361f.

The radius of curvature R of the first section 363f is formed to be less than half of the maximum width W of the magnetic body 351f.

The second section 364f has a second arc-shaped second section 364f having a radius of curvature R1 different from that of the first section 363f.

The radius of curvature R2 of the second arc of the second section 364f has a larger radius of curvature R1 of the first arc.

The connection point P2 between the first section 363f and the second section 364f may be formed to be concave toward the horizontal center line LC _H , for example.

A third section portion 365f having a first arc shape having the same radius of curvature R1 as the first arc is formed at a lower end of the second side surface portion 362f.

A fourth section 366f having a second arc shape having the same radius of curvature R2 as the second arc is formed on one side of the third section 365f.

The first section 363f and the third section 365f are formed to be rotationally symmetric with respect to the center point O of the action surface of the magnetic body 351f.

The second section 364f and the fourth section 366f are formed to be rotationally symmetrical with respect to the center point O of the action surface of the magnetic body 351f.

The connection point P4 of the third section part 365f and the fourth section part 366f may be formed to be concave toward the horizontal center line LC _H , for example.

By this configuration, the motor 250 provided with the permanent magnet 350f for the motor according to the present embodiment has magnetic forces generated at both ends (top and bottom) of the permanent magnet 350f, and the teeth 267 of the stator 260 ) Is reduced in the center of gravity, the generation of cogging torque is reduced, and the back electromotive force THD is improved, so that vibration and noise generation can be suppressed when the motor 250 is driven.

As shown in Fig. 15, the permanent magnet 350g for a motor according to the present embodiment is configured with magnetic bodies 351g on both sides of which magnetic flux action surfaces are respectively formed.

The magnetic body 351g may have a first side surface portion 361g and a second side surface portion 362g spaced side by side; A first section portion 363g extending in a first arc shape from one end of one of the first side portion 361g and the second side portion 362g; And one side is connected to the first section part 363g, and the other side is connected to the other end of the first side part 361g and the second side part 362g, and a linear, elliptical arc, or the first And a second section portion 364g having a second arc shape having a radius of curvature R different from that of the section portion 363g.

The first section portion 363g is formed to be convex outwardly at an upper end of the first side portion 361g.

The radius of curvature R of the first section 363g is formed to be less than half of the maximum width W of the magnetic body 351g.

The second section 364g is formed on one side of the first section 363g. The second section 364g is formed in a linear shape.

The second section portion 364g is configured to form a preset inner angle θ with the second side portion 362g. The interior angle θ is formed in a range of 90 degrees or more and 160 degrees or less.

The second section part 364g is formed in contact with a first arc of the first section part 363g.

The second side portion 362g may be configured to have half the maximum length of the magnetic body 351g, for example.

The working surface of the magnetic body 351g includes a third section (line segment cd) (lower side) horizontally connecting the lower end of the first side surface portion 361g and the lower end of the second side surface portion 362g.

In this embodiment, a case in which the first section 363g and the second section 364g are formed on the upper end of the magnetic body 351g is illustrated, but this is only an example, and the first section 363g And the second section portion 364g may be formed at the lower end of the magnetic body 351g.

Further, in the present embodiment, the second section 364g is formed to be inclined with respect to the second side portion 362g, but this is only an example, and the second section 364g is the second section. It may be connected to the side portion 362g at a right angle. In addition, the second section portion 364g may have an elliptical arc shape or a second arc shape having a radius of curvature R different from the radius of curvature R of the first section portion 363g.

By this configuration, the motor 250 provided with a permanent magnet (350g) for a motor of the present embodiment is a magnetic force generated at the upper end of the permanent magnet (350g) is concentrated in the center of the teeth (267) of the stator (260). This is alleviated, the generation of cogging torque is reduced and the back electromotive force THD is improved, so that generation of vibration and noise can be suppressed when the motor 250 is driven.

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

Claims (27)

In the permanent magnet for a motor having an action surface of the magnetic flux of a magnetic body,
The working surface may include a first side surface portion and a second side surface portion spaced apart from each other;
A first section extending in a first arc shape from one end of one of the first side and the second side; And
One side is connected to the first section and the other side is connected to the other end of the first side and the second side, and has a radius of curvature different from a radius of curvature of a linear, elliptical, or first section. And a second section having a second arc shape,
The magnetic flux action surface of the magnetic body has a maximum length and a maximum width,
The first section has an outwardly convex shape,
A permanent magnet for a motor having a radius of curvature of the first section less than half of the maximum width of the working surface. delete The method of claim 1,
The second section is linear, and the permanent magnet for a motor is formed in contact with the arc of the first section. The method of claim 3,
The second section, the first side and the second side of the inner angle of the other one of the permanent magnet for a motor is formed to be 90 degrees or more to 160 degrees or less. The method of claim 1,
The second section and the other connecting point of the first side and the second side are formed closer to the center of the length direction of the magnetic material compared to the connecting point of the first section and the second section. Permanent magnet for motor The method of claim 1,
A permanent magnet for a motor further comprising a third section formed to extend in a first arc shape of the first section at the other end of the other of the first and second side sections. The method of claim 6,
The permanent magnet for a motor is formed to have the same radius of curvature as the first section and the third section. The method of claim 7,
The permanent magnet for a motor further comprising a fourth section connected to the third section and having a linear, elliptical arc, or a second arc shape of the second section. The method of claim 8,
The second section and the fourth section are linear, and permanent magnets for motors having the same interior angle. The method of claim 9,
The second section and the fourth section are permanent magnets for motors that are rotationally symmetrical with respect to a center point of the action surface. The method of claim 8,
The height of the connection point of the second section and the second side portion is equal to the height of the center of the radius of curvature of the first section based on the top tangent line in contact with the top end of the first section, or 42% of the radius of curvature. A permanent magnet for a motor that is formed to have an increased height. The method of claim 8,
The first section and the third section are permanent magnets for motors that are formed to be rotationally symmetrical with respect to a center point of the action surface. The method of claim 8,
Permanent magnets for motors each having a radius of curvature of the first section and the third section being less than half of the maximum width of the magnetic body. The method of claim 8,
Permanent magnets for motors each having a radius of curvature of the first section and the third section being 27 to 42% of the maximum width of the magnetic body. The method of claim 8,
A permanent magnet for a motor that has a width of 10 to 30 mm. The method of claim 15,
Permanent magnets for motors each of which centers of the radius of curvature of the first and third sections are moved 1.65mm to 4.65mm from the center of the maximum width of the magnetic body. The method of claim 8,
The second section and the fourth section are linear, and the lengths of the second section and the fourth section are equal to or larger than the radius of curvature of the first section, respectively. The method of claim 8,
The total height from the horizontal center line crossing the center point of the action surface to the top tangent line in contact with the uppermost end of the first section is a first height from the horizontal center line to the first connection point of the second section and the second side surface section. Is equal to the sum of the second heights from the first connection point to the top tangent line,
The second height is formed below the first height,
The second height is a permanent magnet for a motor that is formed at a height greater than or equal to a third height from the first connection point to a second connection point to which the first section and the second section are connected. The method of claim 1,
A permanent magnet for a motor which is formed to be rotationally symmetrical with respect to a center point of the action surface. The method of claim 1,
Permanent magnets for motors each having a length of at least half of the maximum length of the magnetic body. The method of claim 1,
The permanent magnet for a motor is formed to be 75% or more of an area of a rectangular area formed with a maximum length and a maximum width of the magnetic body. The method of claim 1,
The magnetic material is a permanent magnet for a motor including a rare earth magnet. The method of claim 1,
A permanent magnet for a motor that has a residual magnetic flux density of 1.2T or more of the magnetic material. Stator; And
Includes; a rotor disposed rotatably with respect to the stator,
The rotor includes a rotor core through which a permanent magnet insertion portion is formed in an axial direction; And
A motor comprising; the permanent magnet for the motor of claim 1 inserted into the permanent magnet insertion part. case;
A compression unit provided inside the case and compressing a refrigerant; And
The compressor including; the motor of claim 24 disposed inside the case and providing a driving force to the compression unit. An indoor unit provided with an indoor heat exchanger for exchanging heat with indoor air; And
An air conditioner comprising: an outdoor unit having a compressor of claim 25 connected to the indoor heat exchanger to provide a compressed refrigerant. An indoor unit having an indoor heat exchanger for exchanging heat with indoor air and an indoor blower fan provided at one side of the indoor heat exchanger; And
An outdoor unit having an outdoor heat exchanger connected to the indoor heat exchanger, a compressor providing compressed refrigerant to the outdoor heat exchanger, and an outdoor fan provided at one side of the outdoor heat exchanger; and
At least one of the indoor blowing fan, the outdoor blowing fan, and the compressor is an air conditioner having the motor of claim 24.

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