Magnet orienting device and magnet

Abstract

The invention provides a magnet orientation device and a magnet. A magnet orientation device according to one aspect of the present invention comprises: an upper plate disposed above a magnet material formed in an arc shape protruding upward; a lower plate disposed below the magnet material; and molds disposed on both sides of the magnet material, the upper plate including a first magnetic body region and a first non-magnetic body region surrounding the first magnetic body region, and the lower plate including a second magnetic body region and a second non-magnetic body region surrounding the second magnetic body region, the bottom surface of the first magnetic body area comprises a plurality of grooves which are formed in an upward concave mode, the top surface of the second magnetic body area comprises a plurality of protrusions which are formed in an upward convex mode, and the length of the first magnetic body area in the horizontal direction is larger than that of the magnet raw material in the horizontal direction. The length of the second magnetic body region in the horizontal direction is equal to or smaller than the length of the magnet material in the horizontal direction.

Description

Technical Field

[0001] The present invention relates to a magnet orientation device and a magnet, and more particularly to a magnet orientation device and a magnet for improving back electromotive force. Background Art

[0002] Generally, a washing machine includes an outer tub for containing washing water and an inner tub rotatably disposed in the outer tub and containing laundry such as clothes. As the inner tub rotates, the laundry is washed and dehydrated.

[0003] Washing machines can be divided into: top loading type, in which the rotation center of the inner tank is formed in a direction perpendicular to the floor, so that laundry can be put in from the top; and front loading type, in which the rotation center of the inner tank is formed in a direction horizontal to the floor or inclined in a direction descending as it approaches the rear end, so that laundry can be put in from the front.

[0004] Top-mounted washing machines can be roughly divided into agitator type and pulsator type. The agitator type washes by rotating a washing rod erected in the center of the inner tank, while the pulsator type washes by rotating a disc-shaped pulsator formed at the bottom of the inner tank.

[0005] A front-loading washing machine is generally referred to as a "drum washing machine". A lifter is provided on the inner circumference of an inner tub. As the drum rotates, the lifter lifts and drops the laundry to perform washing.

[0006] The washing machine is driven in two main operation modes (washing mode, dehydration mode) having operation conditions different from each other.

[0007] In order to satisfy the two main operation modes at the same time, the washing machine has a clutch to operate the output shaft with a gear ratio of n:1 at low speed and high torque (washing mode), or with a gear ratio of 1:1 at high speed and low torque (spinning mode).

[0008] In this case, there is a structure in which the power consumption is reduced and the operation efficiency of the motor is improved by adding a planetary gear.

[0009] Generally, an outer rotor motor is installed in a washing machine. An outer rotor motor has a stator wound with coils disposed inside, and a rotor is arranged radially outside the stator like a magnet surrounding the coils of the stator. The rotor includes a plurality of magnets arranged radially.

[0010] Before becoming a magnet, the electrons in a general magnetic body are randomly arranged. In order to magnetize such a magnetic body, the electron arrangement in the magnetic body is first oriented in a predetermined direction, and then the magnetization process is carried out by applying an external magnetic field to polarize the magnetic body, thereby forming a permanent magnet.

[0011] There are multiple magnetic center lines in a magnet having multiple pole regions. In this case, the multiple magnetic center lines are formed into an asymmetric shape due to the magnetic segmentation region connecting the multiple pole regions and the physical segmentation region as the two ends of the magnet, so there is a problem of reduced motor output and increased noise.

[0012] Prior art literature

[0013] Patent Document 1: Korean Publication Patent No. KR10-2020-0089604 Summary of the invention

[0014] An object of the present invention is to provide a magnet orienting device capable of symmetrically orienting the magnetic center line of a magnet having a plurality of pole regions.

[0015] Another object of the present invention is to provide a magnet orientation device and a magnet capable of increasing the output of a motor and reducing noise.

[0016] A magnet orienting device according to one aspect of the present invention for achieving the above-mentioned purpose may include: an upper plate arranged above a magnet raw material formed in an upwardly protruding arc shape; a lower plate arranged below the magnet raw material; and a mold arranged on both sides of the magnet raw material.

[0017] In this case, the upper plate may include a first magnetic region and a first non-magnetic region surrounding the first magnetic region, and the lower plate may include a second magnetic region and a second non-magnetic region surrounding the second magnetic region.

[0018] In addition, the bottom surface of the first magnetic body region includes a plurality of grooves formed concavely upward, and the top surface of the second magnetic body region includes a plurality of protrusions formed convexly upward. The horizontal length of the first magnetic body region can be greater than the horizontal length of the magnetic raw material, and the horizontal length of the second magnetic body region can be equal to or less than the horizontal length of the magnetic raw material.

[0019] Thus, the magnetic center line of the magnet having a plurality of pole regions is oriented symmetrically, thereby making it possible to increase the output of the motor and reduce noise.

[0020] In addition, the difference between the horizontal length of the magnet material and the horizontal length of the second magnetic region may be greater than 0 and less than 2 mm. Preferably, the horizontal length of the magnet material and the horizontal length of the second magnetic region may be the same.

[0021] Furthermore, a difference between a horizontal length of the first magnetic region and a horizontal length of the magnet material may be 0.2 mm or more and 0.5 mm or less.

[0022] This can improve the efficiency of symmetrically orienting the magnetic center line of a magnet having a plurality of pole regions.

[0023] In addition, the first non-magnetic region may bulge downward as it approaches both sides from the center, and the second non-magnetic region may bulge upward as it approaches the center from both sides.

[0024] In addition, the plurality of grooves and the plurality of protrusions may be formed into curved lines, respectively.

[0025] A magnet orienting device according to one aspect of the present invention for achieving the above-mentioned purpose may include: an upper plate arranged above a magnet raw material formed in an upwardly protruding arc shape; a lower plate arranged below the magnet raw material; and a mold arranged on both sides of the magnet raw material.

[0026] In this case, the upper plate may include a first magnetic region and a first non-magnetic region surrounding the first magnetic region, and the lower plate may include a second magnetic region and a second non-magnetic region surrounding the second magnetic region.

[0027] In addition, the bottom surface of the first magnetic body region includes a plurality of grooves formed in an upward concave manner, and the top surface of the second magnetic body region includes a plurality of protrusions formed in an upward convex manner, and the plurality of grooves and the plurality of protrusions are respectively formed as curves. Among the plurality of grooves, the shapes of the grooves adjacent to the two side surfaces of the first magnetic body region can be different from the shapes of the other grooves, and among the plurality of protrusions, the shapes of the protrusions adjacent to the two side surfaces of the second magnetic body region can be different from the shapes of the other protrusions.

[0028] Furthermore, among the plurality of grooves, grooves adjacent to both side surfaces of the first magnetic region may have a plurality of curvatures, and the other grooves may have a single curvature.

[0029] In this case, among the plurality of grooves, the areas close to the two side surfaces of the first magnetic body region in the grooves adjacent to the two side surfaces of the first magnetic body region may have a first curvature, and the other areas may have a second curvature; and among the plurality of grooves, the grooves other than the grooves adjacent to the two side surfaces of the first magnetic body region may have a second curvature.

[0030] Preferably, the magnitude of the first curvature may be greater than the magnitude of the second curvature.

[0031] More preferably, the value of the first curvature divided by the second curvature may be between 1 and 1.2.

[0032] Thus, the magnetic center line of the magnet having a plurality of pole regions is oriented symmetrically, thereby making it possible to increase the output of the motor and reduce noise.

[0033] Furthermore, among the plurality of protrusions, protrusions adjacent to both side surfaces of the second magnetic region may have a plurality of curvatures, and the other protrusions may have a single curvature.

[0034] In this case, among the multiple protrusions, the areas close to the two side surfaces of the protrusions adjacent to the two side surfaces of the second magnetic body region have a third curvature, and other areas may have a fourth curvature. Among the multiple protrusions, the protrusions other than the protrusions adjacent to the two side surfaces of the second magnetic body region may have a fourth curvature.

[0035] Preferably, the third curvature may be greater than the fourth curvature.

[0036] More preferably, a value of the third curvature divided by the fourth curvature may be between 1 and 1.25.

[0037] Thus, the magnetic center line of the magnet having a plurality of pole regions is oriented symmetrically, thereby making it possible to increase the output of the motor and reduce noise.

[0038] In addition, the first non-magnetic region may bulge downward as it approaches both sides from the center, and the second non-magnetic region may bulge upward as it approaches the center from both sides.

[0039] In addition, the horizontal length of the first magnetic region may be greater than the horizontal length of the magnet material.

[0040] In addition, the horizontal length of the second magnetic region may be equal to or smaller than the horizontal length of the magnet raw material.

[0041] The magnet of one aspect of the present invention for achieving the above-mentioned object can be made by the magnet orienting device of one aspect of the present invention.

[0042] According to the present invention, a magnet orienting device capable of symmetrically orienting the magnetic center line of a magnet having a plurality of pole regions can be provided.

[0043] In addition, according to the present invention, a magnet orientation device and a magnet capable of improving the output of a motor and reducing noise can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 and Figure 2 It is a three-dimensional diagram of a washing machine according to an embodiment of the present invention.

[0045] Figure 3 1 is a perspective view of a driving system for a washing machine according to an embodiment of the present invention.

[0046] Figure 4 1 is an exploded perspective view of a washing machine driving system according to an embodiment of the present invention.

[0047] Figure 5 It is an exploded perspective view of a washing machine driving system according to another embodiment of the present invention.

[0048] Figure 6 FIG. 1 is a top view of a rotor according to an embodiment of the present invention.

[0049] Figures 7 to 10 FIG. 1 is a top view of a magnet according to an embodiment of the present invention.

[0050] Fig.11 FIG. 1 is a top view of a rotor according to an embodiment of the present invention.

[0051] Fig.12 Is magnification Fig.11 Figure 1.

[0052] Fig.13 FIG. 1 is a top view of a polar region according to an embodiment of the present invention.

[0053] Fig.14 This is a graph showing the rate of increase of the back electromotive force of a motor corresponding to the polar anisotropy coefficient of a magnet according to one embodiment of the present invention.

[0054] Fig.15 This is a graph showing the material cost change rate of the stator corresponding to the polar anisotropy coefficient of the magnet according to one embodiment of the present invention.

[0055] Fig.16 This is a graph showing the ratio of rotor manufacturing cost corresponding to the number of pole regions in one magnet according to one embodiment of the present invention.

[0056] Fig.17 This is a graph showing the rate of change in material cost of a motor with respect to the polar anisotropy coefficient of a magnet according to an embodiment of the present invention.

[0057] Fig.18 This is a graph showing the rate of increase of the back electromotive force of a motor corresponding to the polar anisotropy coefficient of a magnet according to one embodiment of the present invention.

[0058] Fig.19 and Fig. 20 This is a diagram showing a plurality of magnetic center lines of a magnet according to an embodiment of the present invention.

[0059] Fig.21 This is a graph showing the cogging torque of a motor based on the relationship between a plurality of magnetic center lines of a magnet according to an embodiment of the present invention.

[0060] Fig. 22 4 is a cross-sectional view of a magnet orientation device and a magnet raw material according to an embodiment of the present invention.

[0061] Fig.23 The diagram shows the magnetic field analysis of the magnetic area and the magnetic material of the magnet orientation device according to one embodiment of the present invention.

[0062] Fig.24 This is a graph showing the cogging torque of a motor and the relationship between the horizontal lengths of the upper plate, the lower plate, and the magnet raw material of the magnet orientation device according to one embodiment of the present invention.

[0063] Fig.25 It is a cross-sectional view of the magnetic body area and the magnet raw material of the magnet orientation device according to one embodiment of the present invention.

[0064] Fig.26 This is a graph showing the cogging torque of a motor according to an embodiment of the present invention and the relationship between the curvature radii of a plurality of slots on an upper plate of a magnet orientation device.

[0065] Fig. 27 This is a graph showing the cogging torque of a motor according to an embodiment of the present invention, showing the relationship between the radii of curvature of a plurality of protrusions on the lower plate of the magnet orientation device.

[0066] Description of Reference Numerals

[0067] 10: Washing machine 20: External tank

[0068] 100: Washing machine drive system 110: Output shaft

[0069] 120: Housing 130: First bearing

[0070] 140: Second bearing 150: Stator

[0071] 160: rotor 162: magnet

[0072] 164: Rotor core 170: Planetary gear set

[0073] 180: Clutch 200: Magnet orientation device

[0074] 210: Upper plate 220: Lower plate

[0075] 230: Magnet raw materials 240: Mold DETAILED DESCRIPTION

[0076] Hereinafter, embodiments disclosed in the present invention will be described in detail with reference to the accompanying drawings, and the same or similar components are given the same reference numerals regardless of the figure numbers, and repeated description thereof will be omitted.

[0077] In the process of describing the embodiments disclosed in the present invention, if it is mentioned that a certain component is "connected" or "linked" to another component, it should be understood that it may be directly connected or linked to the other component, but other components may also be present between them.

[0078] In addition, in the process of describing the embodiments disclosed in the present invention, if it is determined that the specific description of the relevant known technology makes the gist of the embodiments disclosed in the present invention unclear, the detailed description thereof will be omitted. In addition, the drawings are only for helping to understand the embodiments disclosed in the present invention, and the technical ideas disclosed in the present invention are not limited by the drawings, and should be understood to include all changes, equivalents and substitutes within the ideas and technical scope of the present invention.

[0079] In addition, the term disclosure may be replaced by the terms document, specification, description, etc.

[0080] Figure 1 and Figure 2 It is a three-dimensional diagram of a washing machine according to an embodiment of the present invention.

[0081] Reference Figure 1 and Figure 2 The washing machine 10 of one embodiment of the present invention may include an outer tub 20 and a washing machine driving system 100, and may be implemented by removing a portion of the components, and additional components other than the outer tub 20 are not excluded.

[0082] The washing machine 10 of one embodiment of the present invention is described as an example of a front-loading type washing machine in which the rotation center of the inner tank is designed to be formed in a direction horizontal to the floor or inclined in a direction descending as it approaches the rear end, and the laundry can be loaded from the front, but the detailed structure of the washing machine drive system 100 can also be applied to top-loading washing machines.

[0083] The outer tank 20 may be in the shape of a cylinder with an upper portion or a front portion open. An inner tank (not shown) may be disposed inside the outer tank 20. The outer tank 20 may be formed of a plastic material. The inner tank may be connected to the output shaft 110 of the washing machine drive system 100. The washing machine drive system 100 is coupled to the inner tank of the washing machine 10 to rotate the inner tank.

[0084] Figure 3 1 is a perspective view of a driving system for a washing machine according to an embodiment of the present invention. Figure 4 1 is an exploded perspective view of a washing machine driving system according to an embodiment of the present invention. Figure 5 It is an exploded perspective view of a washing machine driving system according to another embodiment of the present invention. Figure 6 FIG. 1 is a top view of a rotor according to an embodiment of the present invention.

[0085] Reference Figure 3 , Figure 4 as well as Figure 6 A washing machine driving system 100 according to an embodiment of the present invention may include an output shaft 110, a housing 120, a first bearing 130, a second bearing 140, a stator 150, a rotor 160, a planetary gear set 170, and a clutch 180. It may also be implemented by removing some of the components, and additional components other than these are not excluded.

[0086] like Figure 5 As shown, the washing machine driving system 100 may also be implemented without the planetary gear set 170 and the clutch 180 .

[0087] The output shaft 110 may extend in the axial direction. The output shaft 110 may be coupled to the inner groove. The output shaft 110 may be rotatably coupled to the housing 120. The output shaft 110 may be coupled to the housing 120 via a bearing. The output shaft 110 may be coupled to the planetary gear set 170.

[0088] An inner groove may be combined in the upper region of the output shaft 110. The central region of the output shaft 110 may be combined with the housing 120 via a bearing. A first bearing 130 and a second bearing 140 may be disposed between the central region of the output shaft 110 and the housing 120.

[0089] The lower region of the output shaft 110 may be disposed inside the rotor 160. The lower region of the output shaft 110 may be coupled to the planetary gear set 170. The diameter of the lower region of the output shaft 110 may be formed to be smaller than the diameter of the central region. The axial length of the lower region of the output shaft 110 may be formed to be shorter than the axial length of the central region of the output shaft 110.

[0090] The output shaft 110 may be rotatably coupled to the housing 120. An inner groove and an outer groove 20 may be disposed at an upper portion of the housing 120. The housing 120 may be coupled to the outer groove 20. A stator 150, a rotor 160, a planetary gear set 170, and a clutch 180 may be disposed at a lower portion of the housing 120. The housing 120 may be coupled to the stator 150. The housing 120 may be formed of a plastic material.

[0091] The first bearing 130 may be disposed between the output shaft 110 and the housing 120. The first bearing 130 may couple the output shaft 110 to the housing 120 through a bearing. The first bearing 130 may rotatably couple the output shaft 110 to the housing 120. The first bearing 130 may extend in a circumferential direction. The first bearing 130 may be disposed above the second bearing 140.

[0092] The second bearing 140 may be disposed between the output shaft 110 and the housing 120. The second bearing 140 may couple the output shaft 110 to the housing 120 through a bearing. The second bearing 140 may rotatably couple the output shaft 110 to the housing 120. The second bearing 140 may extend in the circumferential direction. The second bearing 140 may be disposed below the first bearing 130. The second bearing 140 may be disposed above the planetary gear set 170. The second bearing 140 may be disposed radially inward of the stator 150.

[0093] The stator 150 may be coupled to the housing 120. The stator 150 may be disposed inside the rotor 160. The stator 150 may face the rotor 160. The stator 150 may be disposed above the clutch 180. The stator 150 may include: a coupling portion coupled to the housing 120; a stator disposed radially outside the coupling portion; and a coil wound around the stator. The stator 150 may rotate the rotor 160 through electromagnetic interaction.

[0094] The rotor 160 may face the stator 150. The rotor 160 may be combined with the planetary gear set 170. Thus, the rotor 160 may supply a rotational force to the output shaft 110.

[0095] The rotor 160 may include a rotor core 164 disposed radially outside the stator 150, and a magnet 162 disposed on an inner side of the rotor core 164. The magnet 162 may face the stator 150. The magnet 162 may face the stator of the stator 150. When current is supplied to the coil of the stator 150, the magnet 162 may rotate in one direction or the other through electromagnetic interaction.

[0096] The magnet 162 may include a plurality of magnets spaced apart in the circumferential direction, and the plurality of magnets may be radially arranged with the central region of the rotor core 164 as a reference, and the plurality of magnets may respectively face a plurality of stators spaced apart in the circumferential direction.

[0097] The stator 150 and the rotor 160 may be referred to as a “motor”.

[0098] The planetary gear set 170 may be spline-coupled to the outer circumferential surface of the output shaft 110. The planetary gear set 170 may be coupled to the rotor 160. The planetary gear set 170 may rotate integrally with the rotor 160. The planetary gear set 170 may transmit the rotational force of the rotor 160 to the output shaft 110.

[0099] For example, the planetary gear set 170 can transmit the rotational force of the rotor 160 to the output shaft 110 at a gear ratio of 1:1 or n:1, or can transmit the rotational force of the rotor 160 to the output shaft 110 at a gear ratio of 1:1. Thus, the washing mode and the dehydration mode can be realized without a stop action between the completion of washing and the start of dehydration.

[0100] The clutch 180 may be disposed between the motors 150 and 160 and the planetary gear set 170. A portion of the clutch 180 may be splined with the planetary gear set 170, and another portion may be coupled to the stator 150. The clutch 180 may fix or release a portion of the planetary gear set 170. Thus, the clutch 180 may enable the planetary gear set 170 to transmit the rotational force of the rotor 160 to the output shaft 110 at a 1:1 ratio or transmit it to the output shaft 110 at a reduced gear ratio of n:1.

[0101] Figures 7 to 10 FIG. 1 is a top view of a magnet according to an embodiment of the present invention. Fig.11 FIG. 1 is a top view of a rotor according to an embodiment of the present invention. Fig.12 Is magnification Fig.11 Figure 1.

[0102] like Figure 5 As shown, the magnet 162 according to an embodiment of the present invention may also be applicable to a washing machine 10 driven without the planetary gear set 170 and the clutch 180 .

[0103] Reference Figure 7, the magnet 162 may include single pole regions 1622, 1623. The single pole regions 1622, 1623 may be spaced apart in the circumferential direction. The single pole regions 1622, 1623 may be arranged side by side in the circumferential direction. The single pole regions 1622, 1623 arranged adjacent to each other may have different polarities from each other. For example, the inner side surface of the first pole region 1622 may have an N pole, and the inner side surface of the second pole region 1623 spaced apart from the first pole region 1622 in the circumferential direction may have an S pole.

[0104] The individual polar regions 1622 and 1623 may be formed in an arc shape as a whole. The adjacent individual polar regions 1622 and 1623 may have an inner diameter r of the individual polar regions 1622 and 1623. i The center O of each magnetic focus center b1 and b2 are different. For example, the first magnetic focus center b1 may be the first magnetic orientation m of the first pole region 1622. a The second magnetic focus center b2 may be the second magnetic orientation m of the second pole region 1623. b The distance r between the magnetic focus centers b1 and b2 of the adjacent single pole regions 1622 and 1623 and the single pole regions 1622 and 1623 b Can be identical to each other.

[0105] In one embodiment of the present invention, the case where the magnet 162 is formed of a single pole region 1622, 1623 may be defined as a "single-pole magnet".

[0106] Reference Figure 8 , the magnet 162 may include two polar regions 1624, 1625. The two polar regions 1624, 1625 may be arranged side by side in the circumferential direction. The two polar regions 1624, 1625 may have different polarities from each other. For example, the inner side surface of the third polar region 1624 may have an N pole, and the inner side surface of the fourth polar region 1625 may have an S pole.

[0107] The two polar regions 1624 and 1625 may be formed in an arc shape as a whole. The two adjacent polar regions 1624 and 1625 may have an inner diameter r of the two polar regions 1624 and 1625. i The third magnetic focus center b3 and b4 are different from the center O of the third pole region 1624. For example, the third magnetic focus center b3 may be the third magnetic orientation m c The fourth magnetic focus center b4 may be the fourth magnetic orientation m of the fourth pole region 1625. d The distance r between the magnetic focal centers b3 and b4 of the two polar regions 1624 and 1625 and the two polar regions 1624 and 1625 bThe circumferential distances between the plurality of magnetic focus centers adjacent to the magnetic focus centers b3 and b4 of the two pole regions 1624 and 1625 may be the same as each other.

[0108] In one embodiment of the present invention, the case where the magnet 162 is formed by two polar regions 1624 and 1625 can be defined as a “two-pole magnet”.

[0109] Reference Fig. 9 , the magnet 162 may include three pole regions 1626, 1627, 1628. The three pole regions 1626, 1627, 1628 may be arranged side by side in the circumferential direction. The three pole regions 1626, 1627, 1628 may have different polarities from each other. For example, the inner side surface of the fifth pole region 1626 may have an N pole, the inner side surface of the sixth pole region 1627 may have an S pole, and the inner side surface of the seventh pole region 1628 may have an N pole.

[0110] The three polar regions 1626, 1627, 1628 may be formed in an arc shape as a whole. The three adjacent polar regions 1626, 1627, 1628 may have an inner diameter r of the three polar regions 1626, 1627, 1628. i The center O of each magnetic focus center b5, b6, and b7 are different. For example, the fifth magnetic focus center b5 may be the fifth magnetic orientation m of the fifth pole region 1626. e The sixth magnetic focus center b6 may be the sixth magnetic orientation m of the sixth pole region 1627. f The seventh magnetic focus center b7 may be the seventh magnetic orientation m of the seventh pole region 1628. g The distance r between the magnetic focus centers b5, b6, and b7 of the three polar regions 1626, 1627, and 1628 and the three polar regions 1626, 1627, and 1628 b The circumferential distances between the plurality of magnetic focus centers adjacent to the magnetic focus centers b5, b6, and b7 of the three pole regions 1626, 1627, and 1628 may be the same as each other.

[0111] In one embodiment of the present invention, the situation where the magnet 162 is formed by three polar regions 1626 , 1627 , 1628 may be defined as a “three-pole magnet”.

[0112] Reference Figures 10 to 12, the magnet 162 may include four pole regions 1629, 1630, 1631, 1632. The four pole regions 1629, 1630, 1631, 1632 may be arranged side by side in the circumferential direction. The four pole regions 1629, 1630, 1631, 1632 may have different polarities from each other. For example, the inner side surface of the eighth pole region 1629 may have an N pole, the inner side surface of the ninth pole region 1630 may have an S pole, the inner side surface of the tenth pole region 1631 may have an N pole, and the inner side surface of the eleventh pole region 1632 may have an S pole. The four pole regions 1629, 1630, 1631, 1632 may be formed in an arc shape as a whole.

[0113] The four adjacent polar regions 1629, 1630, 1631, 1632 may have an inner diameter r of the four polar regions 1629, 1630, 1631, 1632. i The center O of each magnetic focus center b8, b9, b10, b11 is different from the center O of each magnetic focus center. For example, the eighth magnetic focus center b8 may be the eighth magnetic orientation m of the eighth pole region 1629. h The ninth magnetic focal center b9 may be the ninth magnetic orientation m of the ninth pole region 1630. i The tenth magnetic focal center b10 may be the tenth magnetic orientation m of the tenth pole region 1631. j The eleventh magnetic focal center b11 may be the eleventh magnetic orientation m of the eleventh pole region 1632. k center of focus.

[0114] In this case, the distances r between the magnetic focus centers b8, b9, b10, b11 of the four polar regions 1629, 1630, 1631, 1632 and the four polar regions 1629, 1630, 1631, 1632 are b The circumferential distances between the plurality of magnetic focus centers adjacent to the magnetic focus centers b8, b9, b10, and b11 of the four pole regions 1629, 1630, 1631, and 1632 may be the same as each other.

[0115] In one embodiment of the present invention, the situation where the magnet 162 is formed by four polar regions 1629 , 1630 , 1631 , 1632 may be defined as a “quadrupole magnet”.

[0116] In one embodiment of the present invention, when there is one at least one polar region 1622, 1623, the number of the plurality of magnets spaced apart in the circumferential direction may be 48, when there are two at least one polar region 1624, 1625, the number of the plurality of magnets spaced apart in the circumferential direction may be 24, when there are three at least one polar region 1626, 1627, 1628, the number of the plurality of magnets spaced apart in the circumferential direction may be 16, and when there are four at least one polar region 1629, 1630, 1631, 1632, the number of the plurality of magnets spaced apart in the circumferential direction may be 12. Thus, the space efficiency of the motors 150, 160 applicable to the washing machine 10 can be improved.

[0117] In one embodiment of the present invention, the case where the number of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 is one to four is described as an example, but the case where there are more than five polar regions is not excluded.

[0118] Fig.13 FIG. 1 is a top view of a polar region according to an embodiment of the present invention.

[0119] Reference Fig.13 , the anisotropic coefficient X is explained.

[0120] d m It refers to the distance between the straight line L2 connecting the two ends of the magnetic center line m2 of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 and the central area of ​​the magnetic center line m2 of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632.

[0121] d b It means that at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 has an inner diameter r of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632. iWhen the center O is the same as the magnetic focus center, the distance between the straight line L1 connecting the two ends of the magnetic center line m1 of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 and the central area of ​​the magnetic center line m1 of at least one of the polar regions 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632.

[0122] exist Fig.13 Medium, d m and d b The illustration is based on the vertical lines separating the left and right sides, but this is only to help understand. In fact, d m and d b It can be interpreted as the meaning of the length based on the overlapping vertical lines.

[0123] Here, d b Mathematical formula 1 can be satisfied.

[0124] [Mathematical formula 1]

[0125]

[0126] Here, r i It may refer to the inner radius of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632, r o 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 and p may refer to the number of poles of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632.

[0127] The polar anisotropy coefficient X is a coefficient that determines the proximity of the magnetic focus center of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 to at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632, and can satisfy the following mathematical formula 2.

[0128] [Mathematical formula 2]

[0129]

[0130] Fig.14 This is a graph showing the rate of increase of the back electromotive force of a motor corresponding to the polar anisotropy coefficient of a magnet according to one embodiment of the present invention.

[0131] Reference Fig.14 , it can be seen that the back electromotive force increase rate corresponding to the polar anisotropy coefficient X of the magnet 162. The back electromotive force increase rate of the motors 150 and 160 increases as the polar anisotropy coefficient X of the magnet 162 increases. Here, the back electromotive force increase rate refers to the ratio of the back electromotive force when the polar anisotropy coefficient changes to the back electromotive force when the polar anisotropy coefficient X is 1. The closer the magnetic focus center b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11 of at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 is to at least one polar region 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632, the higher the polar anisotropy coefficient X can be.

[0132] As the polar anisotropy coefficient X increases, the directional guide (the electronic arrangement of the magnetic body) concentrates at the circumferential center of the polar region and the rigidity of the circumferential end portions of the polar region decreases, so that the magnet 162 may crack. In other words, if the polar anisotropy coefficient X continues to increase, the magnet 162 may crack.

[0133] Specifically, if the polar anisotropy coefficient X reaches 7.5 when the magnet 162 is a one-pole magnet, the magnet 162 may crack; if the polar anisotropy coefficient X reaches 6 when the magnet 162 is a two-pole magnet, the magnet 162 may crack; if the polar anisotropy coefficient X reaches 4.5 when the magnet 162 is a three-pole magnet, the magnet 162 may crack; if the polar anisotropy coefficient X reaches 3.5 when the magnet 162 is a four-pole magnet, the magnet 162 may crack.

[0134] Therefore, preferably, when there is one at least one polar region 1622, 1623 of the magnet 162, the polar anisotropy coefficient X is less than 7.5, when there are two at least one polar region 1624, 1625, the polar anisotropy coefficient X is less than 6, when there are three at least one polar region 1626, 1627, 1628, the polar anisotropy coefficient X is less than 4.5, and when there are four at least one polar region 1629, 1630, 1631, 1632, the polar anisotropy coefficient X is less than 3.5.

[0135] Thus, the possibility of cracks in the magnet 162 is reduced while increasing the back electromotive force of the motors 150 and 160, thereby preventing product damage.

[0136] Fig.15 This is a graph showing the material cost change rate of the stator corresponding to the polar anisotropy coefficient of the magnet according to one embodiment of the present invention. Fig.16 This is a graph showing the rate of change in rotor manufacturing cost with respect to the number of pole regions in one magnet according to one embodiment of the present invention. Fig.17 This is a graph showing the rate of change in material cost of a motor with respect to the polar anisotropy coefficient of a magnet according to an embodiment of the present invention. Fig.18 This is a graph showing the rate of increase of the back electromotive force of a motor corresponding to the polar anisotropy coefficient of a magnet according to one embodiment of the present invention.

[0137] exist Fig.14 In FIG. 1 , it is confirmed that the back electromotive force of the motors 150 and 160 increases with the increase of the polar anisotropy coefficient X. Generally, in the core of the same rotor 160 , the smaller the stacking height of the stator core is, the smaller the back electromotive force of the motor is.

[0138] When the polar anisotropy coefficient X is increased to 1 or more, the stacking height of the stator core can be reduced to achieve the same level of back electromotive force as when the polar anisotropy coefficient X is 1. That is, when the polar anisotropy coefficient X is 1 or more, the material cost of the stator can be reduced by reducing the stacking height of the stator core.

[0139] Reference Fig.15 , it can be seen that the material cost change rate of the stator of the motor 150, 160 is based on the polar anisotropy coefficient X of the motor 150, 160. It can be seen that the back electromotive force of the motor 150, 160 increases with the increase of the polar anisotropy coefficient X, and the stacking of the stator of the motor 150, 160 can be reduced, so the material cost of the stator can be reduced. Here, the material cost ratio of the stator refers to the ratio of the stator material cost when the polar anisotropy coefficient X changes to the stator material cost when the polar anisotropy coefficient X is 1.

[0140] Reference Fig.16 , it can be seen that the number of pole regions 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 in one magnet corresponds to the ratio of the manufacturing cost of the rotor 160. Here, the ratio of the manufacturing cost of the rotor 160 refers to the ratio of the manufacturing cost of the rotor when the number of pole regions in one magnet 162 is less than six to the manufacturing cost of the rotor 160 when one magnet 162 is composed of six pole regions.

[0141] Even if the number of pole regions 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 of one magnet 162 in a rotor 160 of the same size changes, the overall mass of the magnets 162 in the rotor 160 will not change significantly.

[0142] However, the greater the number of pole regions 1622 , 1623 , 1624 , 1625 , 1626 , 1627 , 1628 , 1629 , 1630 , 1631 , 1632 in one magnet 162 , the smaller the number of physical magnets 162 within the rotor 160 . For example, when there is one pole region 1622, 1623 in a magnet 162, 48 physical magnets 162 of the rotor 160 are required, when there are two pole regions 1624, 1625 in a magnet 162, 24 physical magnets 162 of the rotor 160 are required, when there are three pole regions 1626, 1627, 1628 in a magnet 162, 16 physical magnets 162 of the rotor 160 are required, when there are four pole regions 1629, 1630, 1631, 1632 in a magnet 162, 12 physical magnets 162 of the rotor 160 are required, and when there are six pole regions in a magnet 162, 8 physical magnets 162 of the rotor 160 are required.

[0143] As the number of physical magnets 162 of the rotor 160 increases, the number of work steps required to attach the magnets 162 to the inner side of the rotor core 164 increases, and thus the work cost also increases. In other words, it can be considered that as the number of pole regions 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632 in one magnet 162 decreases, the manufacturing cost of the rotor 160 increases.

[0144] Reference Fig.17 , it can be seen that the material cost ratio of the motors 150 and 160 corresponding to the polar anisotropy coefficient X of the magnet 162. The material cost of the motors 150 and 160 can be understood as including Fig.15 The material cost of the stator and Fig.16 The manufacturing cost of the rotor 160 described in .

[0145] exist Fig.17It can be seen that, based on 100% of the material cost of motors 150 and 160, in one magnet 162, the polar anisotropy coefficient X is 6 when there are one pole region 1622 and 1623, the polar anisotropy coefficient X is 4.5 when there are two pole regions 1624 and 1625, the polar anisotropy coefficient X is 3.5 when there are three pole regions 1626, 1627, and 1628, and the polar anisotropy coefficient X is 2.5 when there are four pole regions 1629, 1630, 1631, and 1632.

[0146] It can be seen that if the polar anisotropy coefficient X exceeds 6 when at least one polar region 1622, 1623 is one, the polar anisotropy coefficient X exceeds 4.5 when at least one polar region 1624, 1625 is two, the polar anisotropy coefficient X exceeds 3.5 when at least one polar region 1626, 1627, 1628 is three, and the polar anisotropy coefficient X exceeds 2.5 when at least one polar region 1629, 1630, 1631, 1632 is four, the material cost of motors 150, 160 can be reduced to less than 100%. This means that the lowest critical value for setting the polar anisotropy coefficient X is within the limited material cost of motors 150, 160.

[0147] Therefore, refer to Fig.18 Considering that the magnet 162 does not crack and the material cost of the motors 150 and 160 is limited, the polar anisotropy coefficient X is designed to be between 6 and 7.5 when at least one polar region 1622, 1623 is 1, the polar anisotropy coefficient X is between 4.5 and 6 when at least one polar region 1624, 1625 is two, the polar anisotropy coefficient X is between 3.5 and 4.5 when at least one polar region 1626, 1627, 1628 is three, and the polar anisotropy coefficient X is between 2.5 and 3.5 when at least one polar region 1629, 1630, 1631, 1632 is four. It can be said that the orientation of the magnet 162 with the optimal polar anisotropy coefficient X is achieved.

[0148] Fig.19 and Fig. 20 This is a diagram showing a plurality of magnetic center lines of a magnet according to an embodiment of the present invention.

[0149] Reference Fig.19, the plurality of pole regions 1629, 1630, 1631, 162 of the magnet 162 may have a plurality of magnetic center lines m1, m3, m4, m5. The shapes of the plurality of magnetic center lines m1, m3, m4, m5 may be symmetrical to each other. For example, the radius of curvature of the plurality of magnetic center lines m1, m3, m4, m5 may be the same as each other, and the circumferential lengths of the plurality of magnetic center lines m1, m3, m4, m5 may be the same as each other. Thus, the output of the motors 150, 160 can be increased, and vibration and noise can be prevented.

[0150] Reference Fig. 20 In the actual manufactured magnet 162, the shapes of the plurality of magnetic center lines m1, m3, m4, and m5 of the plurality of pole regions 1629, 1630, 1631, and 1632 can be formed asymmetrically. Specifically, due to the magnetic segmentation regions between the plurality of pole regions 1629, 1630, 1631, and 1632 and the physical segmentation regions at both ends of the magnet 162, the shapes of the plurality of magnetic center lines m1, m3, m4, and m5 are formed asymmetrically.

[0151] For example, the radius of curvature of the first magnetic center line m1 of the eighth pole region 1629 may be different from the radius of curvature of the second magnetic center line m3 of the ninth pole region 1630, and may be different from the radius of curvature of the third magnetic center line m4 of the tenth pole region 1631. Specifically, the radius of curvature of one side (left side) and the radius of curvature of the other side (right side) of the first magnetic center line m1 of the eighth pole region 1629 may be different. In addition, the circumferential length of the first magnetic center line m1 of the eighth pole region 1629 may be different from the circumferential length of the second magnetic center line m3 of the ninth pole region 1630, and may be different from the circumferential length of the third magnetic center line m4 of the tenth pole region 1631.

[0152] As another example, the radius of curvature of the fourth magnetic center line m5 of the eleventh pole region 1632 may be different from the radius of curvature of the second magnetic center line m3 of the ninth pole region 1630, and may be different from the radius of curvature of the third magnetic center line m4 of the tenth pole region 1631. Specifically, the radius of curvature of one side (left side) of the eleventh pole region 1632 and the radius of curvature of the other side (right side) may be different. In addition, the circumferential length of the fourth magnetic center line m5 of the eleventh pole region 1632 may be different from the circumferential length of the second magnetic center line m3 of the ninth pole region 1630, and may be different from the circumferential length of the third magnetic center line m4 of the tenth pole region 1631.

[0153] In this case, the output of the motors 150 , 160 is reduced, and vibration and noise may be generated.

[0154] Fig.21This is a graph showing the cogging torque of a motor based on the relationship between a plurality of magnetic center lines of a magnet according to an embodiment of the present invention.

[0155] Reference Fig.21 It can be seen that, compared with the case where the shapes of the plurality of magnetic center lines m1, m3, m4, m5 of the plurality of pole regions 1629, 1630, 1631, 1632 of the magnet 162 are asymmetrical, when the shapes of the plurality of magnetic center lines m1, m3, m4, m5 of the plurality of pole regions 1629, 1630, 1631, 1632 of the magnet 162 are symmetrical, the cogging torque high harmonics of the motors 150 and 160 and the cogging torque pk-pk of the motors 150 and 160 are reduced. That is, when the shapes of the plurality of magnetic center lines m1, m3, m4, m5 of the plurality of pole regions 1629, 1630, 1631, 1632 of the magnet 162 are symmetrical, the cogging torque is reduced, the output of the motors 150 and 160 is increased, and the generation of vibration and noise can be reduced. Here, the cogging torque refers to a force that prevents the rotor 160 from rotating when the rotor 160 attempts to rotate, and may be generated by a force acting between the magnet 162 of the rotor 160 and the stator of the stator 150 .

[0156] Figures 19 to 21 In the description, the case where the number of the plurality of pole regions is four is taken as an example, but the present invention can also be applied to the case where the number of the plurality of pole regions is two or more.

[0157] Fig. 22 4 is a cross-sectional view of a magnet orientation device and a magnet raw material according to an embodiment of the present invention.

[0158] Reference Fig. 22 The magnet orientation device 200 of one embodiment of the present invention may include an upper plate 210, a lower plate 220 and a mold 240, but does not exclude additional structures other than these. The magnet orientation device 200 orients the electron arrangement of the magnet raw material 230 disposed inside in a predetermined direction, and performs a magnetization process of magnetic polarization by applying an external magnetic field, so that the permanent magnet 162 can be manufactured.

[0159] The upper plate 210 may be disposed above the magnet raw material 230. The magnet raw material 230 may be formed in an arc shape convex upward. In this case, the bottom surface of the upper plate 210 may be formed to be concave upward corresponding to the top surface of the magnet raw material 230.

[0160] The upper plate 210 may include a first magnetic region 212 and a first non-magnetic region 214 surrounding the first magnetic region 212 .

[0161] The bottom surface of the first magnetic region 212 may be formed to be concave upward as a whole. The bottom surface of the first magnetic region 212 may be convex downward as it approaches both sides from the center as a whole. The bottom surface of the first magnetic region 212 may include a plurality of grooves 2122, 2124, 2126, 2128 formed to be concave upward. Each of the plurality of grooves 2122, 2124, 2126, 2128 may be formed as a curve.

[0162] The bottom surface of the first non-magnetic region 214 may be formed in a shape corresponding to the top surface of the magnet material 230. The bottom surface of the first non-magnetic region 214 may be formed to be concave upward. The bottom surface of the first non-magnetic region 214 may be convex downward from the center toward both sides.

[0163] The lower plate 220 may be disposed below the magnet raw material 230. The top surface of the lower plate 230 may be formed to protrude upward corresponding to the bottom surface of the magnet raw material 230.

[0164] The lower plate 220 may include a second magnetic region 222 and a second non-magnetic region 224 surrounding the second magnetic region 222 .

[0165] The top surface of the second magnetic region 222 may be formed to bulge upward as a whole. The top surface of the second magnetic region 222 may bulge upward as a whole from both sides approaching the center. The top surface of the second magnetic region 222 may include a plurality of protrusions 2222, 2224, 2226, 2228 formed to bulge upward. Each of the plurality of protrusions 2222, 2224, 2226, 2228 may be formed as a curve.

[0166] The top surface of the second non-magnetic region 224 may be formed in a shape corresponding to the bottom surface of the magnet material 230. The top surface of the second non-magnetic region 224 may be formed to bulge upward. The top surface of the second non-magnetic region 224 may bulge upward as it approaches the center from both sides.

[0167] The mold 240 is arranged on both sides of the magnet raw material 230 to support the magnet raw material 230. The bottom surface of the upper plate 210 can be arranged on the top surface of the mold 240, and the outer surface of the lower plate 220 can be arranged on the inner surface of the mold 240. Alternatively, the top surface of the lower plate 220 can be arranged on the bottom surface of the mold 240, and the outer surface of the upper plate 210 can be arranged on the inner surface of the mold 240.

[0168] Fig.23 The diagram shows the magnetic field analysis of the magnetic area and the magnetic material of the magnet orientation device according to one embodiment of the present invention.

[0169] Reference Fig.23It can be seen that a magnetic field is formed between the magnetic regions 212 and 222 of the magnet orientation device 200 and the magnet raw material 230. In this case, due to the fringing effect, the magnetic flux is bent in the regions B on both sides of the magnet raw material 230. This fringing effect is affected by the horizontal length W of the first magnetic region 212. u , the horizontal length W of the second magnetic region 222 d and the horizontal length W of the magnet material 230 m By utilizing this edge effect, the magnetic center lines m1, m3, m4, and m5 of the plurality of pole regions 1629, 1630, 1631, and 1632 of the magnet 162 can be symmetrically formed.

[0170] It can be interpreted that the horizontal length W of the first magnetic region 212 is u It means that the length of the first magnetic region 212 in the horizontal direction is the maximum value, and the horizontal length W of the magnet material 230 is m It refers to the maximum value of the length of the magnet material 230 in the horizontal direction, and the horizontal length W of the second magnetic region 222 d It refers to the value at which the length of the second magnetic region 222 in the horizontal direction is the maximum.

[0171] Fig.24 This is a graph showing the cogging torque of a motor and the relationship between the horizontal lengths of the upper plate, the lower plate, and the magnet raw material of the magnet orientation device according to one embodiment of the present invention.

[0172] Reference Fig.24 It can be seen that as the horizontal length W of the magnet raw material 230 m and the horizontal length W of the second magnetic region 222 d The difference is close to 0, and the cogging torque of the motors 150 and 160 is reduced. In addition, although not shown, the horizontal length W of the second magnetic region 222 is d Greater than the horizontal length W of the magnet material 230 m In other words, it can be seen that the cogging torque increases when the horizontal length W of the magnet raw material 230 is m and the horizontal length W of the second magnetic region 222 d When the difference is equal to or greater than 0 and equal to or less than 2 mm, the cogging torque of the motors 150 and 160 is reduced. Preferably, it can be known that when the horizontal length W of the magnet raw material 230 is m and the horizontal length W of the second magnetic region 222 d Under the same conditions, the cogging torque is reduced.

[0173] That is, the horizontal length W of the second magnetic region 222 is d It may be equal to or less than the horizontal length W of the magnet raw material 230. m The horizontal length W of the magnet material 230 m and the horizontal length W of the second magnetic region 222 d The difference between the horizontal length W and the horizontal length W of the second magnetic region 222 may be greater than 0 and less than 2 mm. d The horizontal length W of the magnet raw material 230 may be m same.

[0174] In addition, refer to Fig.24 It can be seen that the horizontal length W of the first magnetic region 212 u Greater than the horizontal length W of the magnet material 230 m In the case of, the cogging torque of the motors 150 and 160 is reduced. Preferably, it can be seen that the horizontal length W of the first magnetic region 212 is u and the horizontal length W of the magnet material 230 m When the difference is 0 to 1 mm, the cogging torque of the motors 150 and 160 is reduced. More preferably, it is known that when the horizontal length W of the first magnetic region 212 is u and the horizontal length W of the magnet material 230 m When the difference is greater than or equal to 0.2 mm and less than or equal to 0.5 mm, the cogging torque of the motors 150 and 160 can be minimized.

[0175] That is, the horizontal length W of the first magnetic region 212 is u It can be greater than the horizontal length W of the magnet raw material 230 m The horizontal length W of the first magnetic region 212 u and the horizontal length W of the magnet material 230 m The difference may be greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

[0176] Thus, by symmetrically forming the magnetic center lines m1, m3, m4, and m5 of the plurality of pole regions 1629, 1630, 1631, and 1632 of the magnet 162, it is possible to increase the output of the motors 150 and 160 and reduce the generation of vibration and noise.

[0177] Fig.25 It is a cross-sectional view of the magnetic body area and the magnet raw material of the magnet orientation device according to one embodiment of the present invention.

[0178] Reference Fig.25The plurality of grooves 2122 , 2124 , 2126 , 2128 of the upper plate 212 may include a first groove 2122 , a second groove 2124 , a third groove 2126 and a fourth groove 2128 .

[0179] The shape of the first groove 2122 may be different from the shapes of the second groove 2124 and the third groove 2126. The shape of the fourth groove 2128 may be different from the shapes of the second groove 2124 and the third groove 2126. That is, the shapes of the grooves adjacent to the two side surfaces of the first magnetic body 212 may be formed to be different from the shapes of the other grooves. Thus, the shapes of the magnetic center lines m1, m3, m4, and m5 of the plurality of pole regions 1629, 1630, 1631, and 1632 of the magnet 160 may be formed symmetrically with each other.

[0180] Specifically, a region on one side (left side) of the first groove 2122 may have a first curvature radius R1, and a region on the other side (right side) of the first groove 2122 may have a second curvature radius R2. The second groove 2124 and the third groove 2126 may have a second curvature radius R2. A region on one side (left side) of the fourth groove 2128 may have a second curvature radius R2, and a region on the other side (right side) of the fourth groove 2128 may have a first curvature radius R1.

[0181] Here, the first groove 2122 and the fourth groove 2128 may refer to grooves adjacent to both side surfaces of the first magnetic body 212 , and the second groove 2124 and the third groove 2126 may refer to grooves other than the grooves adjacent to both side surfaces of the first magnetic body 212 .

[0182] In addition, it can be explained that the area on one side (left side) of the first groove 2122 and the area on the other side (right side) of the fourth groove 2128 refer to the areas in the grooves adjacent to the two side surfaces of the first magnetic body 212 that are close to the two side surfaces of the first magnetic body 212, and the area on the other side (right side) of the first groove 2122 and the area on one side (left side) of the fourth groove 2128 refer to the areas in the grooves adjacent to the two side surfaces of the first magnetic body 212 excluding the areas close to the two side surfaces of the first magnetic body 212.

[0183] In one embodiment of the present invention, in order to form four polar regions, an example is given in which the number of the plurality of slots 2122 , 2124 , 2126 , 2128 is four, but the number of the plurality of slots 2122 , 2124 , 2126 , 2128 may vary according to the number of polar regions of the magnet 160 .

[0184] The plurality of protrusions 2222 , 2224 , 2226 , 2228 of the lower plate 222 may include a first protrusion 2222 , a second protrusion 2224 , a third protrusion 2226 , and a fourth protrusion 2228 .

[0185] In this case, the shape of the first protrusion 2222 may be different from the shapes of the second protrusion 2224 and the third protrusion 2226. The shape of the fourth protrusion 2228 may be different from the shapes of the second protrusion 2224 and the third protrusion 2226. That is, the shapes of the protrusions adjacent to the two side surfaces of the second magnetic body 222 may be formed to be different from the shapes of the other protrusions. Thus, the shapes of the magnetic center lines m1, m3, m4, and m5 of the plurality of pole regions 1629, 1630, 1631, and 1632 of the magnet 160 may be formed symmetrically with each other.

[0186] Specifically, a region on one side (left side) of the first protrusion 2222 may have a third curvature radius R3, and a region on the other side (right side) of the first protrusion 2222 may have a fourth curvature radius R4. The second protrusion 2224 and the third protrusion 2226 may have a fourth curvature radius R4. A region on one side (left side) of the fourth protrusion 2228 may have a fourth curvature radius R4, and a region on the other side (right side) of the fourth groove 2128 may have a third curvature radius R3.

[0187] Here, the first protrusion 2222 and the fourth protrusion 2228 may refer to protrusions adjacent to the two side surfaces of the second magnetic body 222 , and the second protrusion 2224 and the third protrusion 2226 may refer to protrusions other than the protrusions adjacent to the two side surfaces of the second magnetic body 222 .

[0188] In addition, it can be explained that the area on one side (left side) of the first protrusion 2222 and the area on the other side (right side) of the fourth protrusion 2228 refer to the areas in the protrusions adjacent to the two side surfaces of the second magnetic body 222 that are close to the two side surfaces of the second magnetic body 222, and the area on the other side (right side) of the first protrusion 2222 and the area on one side (left side) of the fourth protrusion 2228 refer to the areas in the protrusions adjacent to the two side surfaces of the second magnetic body 222 except the areas close to the two side surfaces of the first magnetic body 212.

[0189] In one embodiment of the present invention, in order to form four polar regions, an example is given in which the number of the plurality of protrusions 2222 , 2224 , 2226 , 2228 is four, but the number of the plurality of protrusions 2222 , 2224 , 2226 , 2228 may vary according to the number of polar regions of the magnet 160 .

[0190] Fig.26 This is a graph showing the cogging torque of a motor according to an embodiment of the present invention and the relationship between the curvature radii of a plurality of slots on an upper plate of a magnet orientation device.

[0191] Reference Fig.26It can be seen that, compared with the previous case where the first curvature R1 and the second curvature R2 are the same, when the first curvature R1 is larger than the second curvature R2, the cogging torque of the motors 150 and 160 is reduced. Specifically, it can be seen that when the value of the first curvature R1 divided by the second curvature R2 is between 1 and 1.2, the cogging torque of the motors 150 and 160 can be reduced compared with the previous case.

[0192] That is, the magnitude of the first curvature R1 may be greater than the magnitude of the second curvature R2. Preferably, the value of the first curvature R1 divided by the second curvature R2 may be between 1 and 1.2. Thus, the magnetic center lines m1, m3, m4, and m5 of the magnet 162 having a plurality of pole regions 1629, 1630, 1631, and 1632 are symmetrically oriented, thereby being able to increase the output of the motors 150 and 160 and reduce noise.

[0193] Fig. 27 This is a graph showing the cogging torque of a motor according to an embodiment of the present invention, showing the relationship between the radii of curvature of a plurality of protrusions on the lower plate of the magnet orientation device.

[0194] Reference Fig. 27 It can be seen that, compared with the case where the third curvature R3 and the fourth curvature R4 are the same in the past, when the third curvature R3 is larger than the fourth curvature R4, the cogging torque of the motors 150 and 160 is reduced. Specifically, it can be seen that when the value of the third curvature R3 divided by the fourth curvature R4 is between 1 and 1.25, the cogging torque of the motors 150 and 160 can be reduced compared with the past.

[0195] That is, the magnitude of the third curvature R3 may be greater than the magnitude of the fourth curvature R4. Preferably, the value of the third curvature R3 divided by the fourth curvature R4 may be between 1 and 1.25. Thus, the magnetic center lines m1, m3, m4, and m5 of the magnet 162 having a plurality of pole regions 1629, 1630, 1631, and 1632 are symmetrically oriented, thereby being able to increase the output of the motors 150 and 160 and reduce noise.

[0196] The aforementioned certain embodiments or other embodiments of the present invention are not mutually exclusive or distinct. The various components or functions of the aforementioned certain embodiments or other embodiments of the present invention may be mixed or combined.

[0197] For example, this means that the A configuration described in a specific embodiment and / or drawing can be combined with the B configuration described in another embodiment and / or drawing. In other words, it means that even if the combination between the configurations is not directly described, they can be combined except for the case where it is described that they cannot be combined.

[0198] The above detailed description should not be interpreted as limiting in all aspects, but should be considered as illustrative. 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 are included in the scope of the present invention.

Claims

1. A magnetic orientation device, wherein: include: An upper plate is arranged above the magnet raw material formed in an upwardly convex arc shape; A lower plate, arranged below the magnet raw material; as well as The mold is arranged on both sides of the magnet raw material. The upper plate includes a first magnetic region and a first non-magnetic region surrounding the first magnetic region. The lower plate includes a second magnetic region and a second non-magnetic region surrounding the second magnetic region. The bottom surface of the first magnetic region includes a plurality of grooves formed concavely upward. The top surface of the second magnetic region includes a plurality of protrusions formed to protrude upward. The horizontal length of the first magnetic region is greater than the horizontal length of the magnet raw material. The horizontal length of the second magnetic region is equal to or smaller than the horizontal length of the magnet raw material.

2. The magnet orientation device according to claim 1, wherein: A difference between a horizontal length of the magnet material and a horizontal length of the second magnetic region is greater than or equal to 0 and less than or equal to 2 mm.

3. The magnet orientation device according to claim 2, wherein: The horizontal length of the magnet raw material is the same as the horizontal length of the second magnetic region.

4. The magnet orientation device according to claim 1, wherein: A difference between a horizontal length of the first magnetic region and a horizontal length of the magnet material is 0.2 mm or more and 0.5 mm or less.

5. The magnet orientation device according to claim 1, wherein: The first non-magnetic region protrudes downward from the center toward both sides. The second non-magnetic region protrudes upward as it approaches the center from both sides.

6. The magnet orientation device according to claim 1, wherein: The plurality of grooves and the plurality of protrusions are formed into curved lines, respectively.

7. A magnet orientation device, wherein: include: An upper plate is arranged above the magnet raw material formed in an upwardly convex arc shape; A lower plate, arranged below the magnet raw material; as well as The mold is arranged on both sides of the magnet raw material. The upper plate includes a first magnetic region and a first non-magnetic region surrounding the first magnetic region. The lower plate includes a second magnetic region and a second non-magnetic region surrounding the second magnetic region. The bottom surface of the first magnetic region includes a plurality of grooves formed concavely upward. The top surface of the second magnetic region includes a plurality of protrusions formed to protrude upward. The plurality of grooves and the plurality of protrusions are formed into curves respectively, Among the plurality of grooves, the shapes of the grooves adjacent to both side surfaces of the first magnetic region are different from the shapes of the other grooves. Among the plurality of protrusions, shapes of protrusions adjacent to both side surfaces of the second magnetic region are different from shapes of the other protrusions.

8. The magnet orientation device according to claim 7, wherein: Among the plurality of grooves, grooves adjacent to both side surfaces of the first magnetic region have a plurality of curvatures, and the other grooves have a single curvature.

9. The magnet orientation device according to claim 8, wherein: Among the plurality of grooves, the grooves adjacent to the two side surfaces of the first magnetic region have regions close to the two side surfaces of the first magnetic region having a first curvature, and the other regions have a second curvature. Among the plurality of grooves, grooves other than grooves adjacent to both side surfaces of the first magnetic region have a second curvature.

10. A magnet made by the magnet orienting device according to claim 1 or 7.

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