Permanent magnet, rotor structure, permanent magnet motor and compressor

Abstract

The present application provides a permanent magnet, a rotor structure, a permanent magnet motor, and a compressor. The permanent magnet has two long sides, and an adjustment zone is provided on at least one side of the central axis of the permanent magnet. The intrinsic coercive force of the adjustment zone is greater than the intrinsic coercive force of other areas on the permanent magnet. The adjustment zone extends from the long side corresponding to the adjustment zone toward the middle of the width of the permanent magnet, and the adjustment zone is protruded toward the interior of the permanent magnet along the width direction of the permanent magnet in the middle of the length of the permanent magnet. The permanent magnet of the present application, by providing an adjustment zone on at least one side of the permanent magnet, setting the intrinsic coercive force of the adjustment zone to be larger, and protruding the middle of the adjustment zone toward the interior of the permanent magnet, can improve the anti-demagnetization ability of the adjustment zone on the permanent magnet, thereby improving the anti-demagnetization ability of the permanent magnet, and can make the remanence of the permanent magnet as a whole higher, so as to achieve a balance between remanence and intrinsic coercive force.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and more specifically, relates to a permanent magnet, a rotor structure, a permanent magnet motor and a compressor. Background Art

[0002] Permanent magnets are a key material in motor development, and their remanence (Br) and intrinsic coercivity (Hcj) are key parameters. To improve motor efficiency, using high-grade magnets with higher remanence (Br) is a more effective solution. However, high remanence often comes with a decrease in intrinsic coercivity (Hcj), which reduces the motor's resistance to demagnetization and puts it at risk of irreversible demagnetization.

[0003] In the existing technology, because the remanence and intrinsic coercive force in permanent magnets are uniformly distributed, it is required to comprehensively consider the impact of both on motor efficiency and anti-demagnetization ability. Only one parameter, the remanence or the intrinsic coercive force, can be prioritized, and the other parameter needs to be appropriately sacrificed. As a result, the remanence and intrinsic coercive force of current permanent magnets cannot be taken into account at the same time. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a permanent magnet, a rotor structure, a permanent magnet motor and a compressor to solve the problem in the prior art that the remanence and intrinsic coercive force of the permanent magnet in the motor cannot be taken into account at the same time.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present application is: providing a permanent magnet, wherein the permanent magnet has two long sides located on opposite sides of its central axis, and an adjustment area is provided on at least one side of the central axis on the permanent magnet, the intrinsic coercive force of the adjustment area is greater than the intrinsic coercive force of other areas on the permanent magnet, and the adjustment area extends from the long side corresponding to the adjustment area toward the middle of the width of the permanent magnet, and the adjustment area protrudes toward the inside of the permanent magnet along the width direction of the permanent magnet at the middle of the length of the permanent magnet.

[0006] In an optional embodiment, the adjustment zone includes multiple sub-partitions, and the multiple sub-partitions are arranged in sequence from the corresponding long side toward the middle of the width of the permanent magnet, and the intrinsic coercive force of the multiple sub-partitions decreases in sequence from the corresponding long side toward the middle of the width of the permanent magnet.

[0007] In an optional embodiment, the plurality of subpartitions include a first subpartition, a second subpartition and a third subpartition, and the first subpartition, the second subpartition and the third subpartition are arranged in sequence from the corresponding long sides of the permanent magnet toward the middle of the width of the permanent magnet.

[0008] In an optional embodiment, the intrinsic coercive force of the first sub-region is in the range of 1890KA / m-2000KA / m; the intrinsic coercive force of the second sub-region is in the range of 1830KA / m-1890KA / m; and the intrinsic coercive force of the third sub-region is in the range of 1780KA / m-1830KA / m.

[0009] In an optional embodiment, the projection of each sub-region on one side of the permanent magnet along the thickness direction of the permanent magnet is a rectangle, the length of the permanent magnet is L, and the width of the permanent magnet is H; the length of the first sub-region is L1, and the width of the first sub-region is H1, then L1=L, 0.1H

[0010] In an optional embodiment, a plurality of dividing lines are formed on the adjustment area, the middle portion of each dividing line protrudes toward the interior of the permanent magnet along the width direction of the permanent magnet, and the two ends of each dividing line along the length direction of the permanent magnet are respectively connected to the two ends of the adjacent long side; the plurality of dividing lines include a first dividing line, a second dividing line and a third dividing line, the area enclosed by the first dividing line and the adjacent long side forms the first sub-partition, the area enclosed by the second dividing line and the first dividing line forms the second sub-partition, and the area enclosed by the third dividing line and the second dividing line forms the third sub-partition.

[0011] In an optional embodiment, each of the separation lines is in an arc shape, and the center of each of the separation lines is located on the center line of the permanent magnet in the width direction.

[0012] In an optional embodiment, the length of the permanent magnet is L, the radius of the first separation line is R1, the radius of the second separation line is R2, and the radius of the third separation line is R3, then R1>R2>R3≥L.

[0013] In an alternative embodiment, R1 = 4L, R2 = 2L, and R3 = 1.25L.

[0014] In an optional embodiment, each of the dividing lines and the adjacent long side forms an isosceles triangle with the long side as the base.

[0015] ​In an optional embodiment, the width of the permanent magnet is H, the height of the first sub-partition along the length direction of the permanent magnet is H1, the maximum width of the second sub-partition along the length direction of the permanent magnet is H2, and the maximum width of the third sub-partition along the length direction of the permanent magnet is H3, then H1<H2<H3≤0.5H.

[0016] In an optional embodiment, each of the separation lines is in the shape of an elliptical arc with the major axis being adjacent to the long side, and the minor axis of each of the separation lines is located on the center line of the permanent magnet in the width direction.

[0017] In an optional embodiment, each of the dividing lines and the adjacent long side forms an isosceles trapezoid with the long side as the base.

[0018] In an optional embodiment, the magnetization direction of the permanent magnet is parallel to the thickness direction of the permanent magnet, and the intrinsic coercive force of the adjustment region is uniformly distributed along the magnetization direction.

[0019] In an optional embodiment, the adjustment areas are symmetrically distributed on two sides of the permanent magnet.

[0020] In an optional embodiment, the adjustment areas are symmetrically distributed on two opposite sides in the length direction of the permanent magnet.

[0021] Another object of the embodiments of the present application is to provide a rotor structure comprising the permanent magnet as described in any of the above embodiments.

[0022] Another object of the embodiments of the present application is to provide a permanent magnet motor, comprising the permanent magnet as described in any of the above embodiments.

[0023] Another object of the embodiments of the present application is to provide a compressor comprising the permanent magnet as described in any of the above embodiments.

[0024] The beneficial effect of the permanent magnet provided by the embodiment of the present application is that: compared with the prior art, the permanent magnet of the present application, by setting an adjustment zone on at least one side of the permanent magnet, setting the intrinsic coercive force of the adjustment zone to be larger, and setting the middle part of the adjustment zone to protrude toward the interior of the permanent magnet, can improve the anti-demagnetization ability of the adjustment zone on the permanent magnet, thereby improving the anti-demagnetization ability of the permanent magnet, and the overall remanence of the permanent magnet can be made higher, so as to achieve a balance between remanence and intrinsic coercive force.

[0025] The beneficial effect of the rotor structure provided by the embodiments of the present application is that, compared with the prior art, the rotor structure of the present application uses the permanent magnets described in any of the above embodiments, and not only has the technical effects of the permanent magnets described in the above embodiments, but also the rotor structure has high efficiency and long service life when used.

[0026] The beneficial effect of the permanent magnet motor provided by the embodiments of the present application is that: compared with the existing technology, the permanent magnet motor of the present application uses the permanent magnet described in any of the above embodiments, and not only has the technical effects of the permanent magnet described in the above embodiments, but also the permanent magnet motor has high efficiency and long service life when used.

[0027] The beneficial effect of the compressor provided by the embodiment of the present application is that: compared with the existing technology, the compressor of the present application uses the permanent magnet described in any of the above embodiments, and not only has the technical effects of the permanent magnet described in the above embodiments, but also the compressor has high operating efficiency, long service life, and is more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A side view schematic diagram of the structure for simulating demagnetization of permanent magnets in a motor;

[0030] Figure 2 for Figure 1 The schematic diagram of the front view of the permanent magnet simulated demagnetization shown;

[0031] Figure 3 It is a schematic diagram of the front view structure of the two sides of the permanent magnet in the motor after demagnetization;

[0032] Figure 4 This is a schematic front view of the structure of the permanent magnet provided in Example 1 of the present application;

[0033] Figure 5 For the Figure 4 Schematic diagram of the cross-sectional structure along the midline AA;

[0034] Figure 6 For the Figure 4 Schematic diagram of the cross-sectional structure of the midline BB;

[0035] Figure 7 This is a schematic front view of the structure of the permanent magnet provided in Example 2 of the present application;

[0036] Figure 8 For the Figure 7 Schematic diagram of the cross-sectional structure of the midline CC;

[0037] Figure 9 This is a schematic front view of the structure of the permanent magnet provided in Example 3 of the present application;

[0038] Figure 10 For the Figure 9 Schematic diagram of the cross-sectional structure of the midline EE;

[0039] Figure 11 This is a schematic front view of the structure of the permanent magnet provided in Example 4 of the present application;

[0040] Figure 12 This is a schematic front view of the structure of the permanent magnet provided in Example 5 of the present application;

[0041] Figure 13 This is a schematic front view of the structure of the permanent magnet provided in Example 6 of the present application;

[0042] Figure 14 This is a schematic front view of the structure of the permanent magnet provided in Example 7 of the present application;

[0043] Figure 15 This is a schematic front view of the structure of the permanent magnet provided in Example 8 of the present application;

[0044] Figure 16 This is a schematic front view of the structure of the permanent magnet provided in Example 9 of the present application;

[0045] Figure 17 This is a schematic diagram of the front view structure of the permanent magnet provided in Example 10 of the present application.

[0046] Among them, the main marks of the drawings in the figure are:

[0047] 100-Permanent magnet;

[0048] 11-adjustment area; 110-sub-area; 111-first sub-area; 112-second sub-area; 113-third sub-area; 114-fourth sub-area;

[0049] 121-long side; 122-short side;

[0050] 131-center line; 132-central axis;

[0051] 140-dividing line; 141-first dividing line; 142-second dividing line; 143-third dividing line. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0053] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0054] In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined. The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. The terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0056] References to "one embodiment," "some embodiments," or "an embodiment" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present invention. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0057] Using permanent magnets with high remanence Br in motors often results in higher motor efficiency, making the motor more energy-efficient. However, demagnetization often occurs during motor use. In particular, permanent magnets with high remanence Br can reduce their intrinsic coercivity (Hcj). This high remanence reduces the intrinsic coercivity (Hcj), which is key to a permanent magnet's resistance to demagnetization. A high intrinsic coercivity results in a higher resistance to demagnetization, while a low intrinsic coercivity results in a weaker resistance. Therefore, motor development often requires a balance between remanence and intrinsic coercivity. Currently, the preference is often to maintain either remanence or intrinsic coercivity at the expense of the other. To address this issue, existing techniques propose placing high intrinsic coercivity regions on the sides of the permanent magnet. However, when the overall remanence of the permanent magnet is set high, the high intrinsic coercivity regions need to be smaller, resulting in demagnetization in some areas of the permanent magnet during normal use, reducing the motor's service life. In order to ensure the permanent magnet's good anti-demagnetization ability, it is often necessary to set the high intrinsic coercive force area larger, that is, the intrinsic coercive force area occupies a larger area on the permanent magnet to ensure that demagnetization does not occur at various positions of the permanent magnet during normal use, resulting in weaker overall remanence of the permanent magnet.

[0058] See also Figure 1 and Figure 2 , after research, it was found that when the permanent magnets in the motor are in use, especially the permanent magnets in the compressor motor, the two corners at one end of the permanent magnet 900 in the thickness direction are prone to demagnetization, that is, the two corners close to one side of the permanent magnet 900 are prone to demagnetization. Figure 1 The regions 91 and 92 of the permanent magnet 900 are easily demagnetized regions. Figure 2 The middle region 93 , the region 94 , the region 95 , the region 96 , the region 97 , and the region 98 are regions that are easily demagnetized.

[0059] See also Figure 3 , through the detection of the demagnetized permanent magnet 900 actually used in the motor, it was found that the edge area on one side of the length direction of the permanent magnet 900, such as Figure 3 The middle region 901 and the region 902 are demagnetized.

[0060] Based on the above research and the problem that only one of the remanence and intrinsic coercive force of permanent magnets used in current motors can be selected, but not both, this application proposes the following permanent magnet solution to ensure the overall good anti-demagnetization ability and overall high remanence of the permanent magnet.

[0061] See also Figures 4 to 6 , Figure 4 This is a schematic front view of the permanent magnet structure provided in this embodiment. Figure 5 For the Figure 4 Schematic diagram of the cross-sectional structure along the midline AA. Figure 6 For the Figure 4 Schematic diagram of the cross-sectional structure of the center line BB.

[0062] See also Figures 4 to 6 The permanent magnet 100 provided in the present application is now described. The permanent magnet 100 has a length L, a width H, and a thickness D, so that the permanent magnet 100 as a whole forms a rectangular parallelepiped or a rectangular parallelepiped-like shape, such that one side of the permanent magnet 100 forms a rectangular or rectangular-like shape. For the convenience of description, the center line 131 and the central axis 132 of the permanent magnet 100 are defined, wherein the center line 131 is the center line 131 of the permanent magnet 100 in the width direction, and the central axis 132 is the central axis 132 of the permanent magnet 100 in the length direction; wherein, the center line 131 refers to the center line 131 on the permanent magnet 100 parallel to the width direction of the permanent magnet 100, the center line 131 is perpendicular to the length direction of the permanent magnet 100, and the center line 131 passes through the center of the permanent magnet 100; the central axis 132 refers to the central axis 132 on the permanent magnet 100 parallel to the length direction of the permanent magnet 100, the central axis 132 is perpendicular to the width direction of the permanent magnet 100, and the central axis 132 passes through the center of the permanent magnet 100. The permanent magnet 100 has two long sides 121 and two short sides 122. The two long sides 121 are located on opposite sides of the central axis 132 of the permanent magnet 100, and the two short sides 122 are located on opposite ends of the central axis 132 of the permanent magnet 100. In other words, the two long sides 121 are located on opposite ends of the centerline 131 of the permanent magnet 100, and the two short sides 122 are located on opposite sides of the centerline 131 of the permanent magnet 100. In addition, for the convenience of description, the two sides of the permanent magnet 100 are defined as the two opposite surfaces of the permanent magnet 100, and the thickness of the permanent magnet 100 is between the two opposite surfaces. In other words, the thickness direction of the permanent magnet 100 is perpendicular to the two sides of the permanent magnet 100.

[0063] The adjustment region 11 is provided on at least one side of the central axis 132 of the permanent magnet 100. Specifically, the adjustment region 11 can be provided on one side of the permanent magnet 100 in its longitudinal direction, or on two opposite sides of the permanent magnet 100 in its longitudinal direction. The intrinsic coercive force of the adjustment region 11 is greater than that of other regions of the permanent magnet 100, thereby ensuring that the adjustment region 11 on the permanent magnet 100 has good anti-demagnetization capability.

[0064] The adjustment zone 11 extends from the adjacent long side 121 toward the middle of the width direction of the permanent magnet 100. That is, the adjustment zone 11 extends from the long side 121 on one side of the permanent magnet 100 where the adjustment zone 11 is located, toward the middle of the width of the permanent magnet 100. The middle of the adjustment zone 11 protrudes toward the middle of the width direction of the permanent magnet 100. The middle of the adjustment zone 11 refers to the middle of the adjustment zone 11 along the length direction of the permanent magnet 100. That is, the adjustment zone 11 is located in the middle of the length direction of the permanent magnet 100, along the width direction of the permanent magnet 100, and protrudes toward the interior of the permanent magnet 100. In this way, the adjustment zone 11 can better cover the easily demagnetized area on the corresponding side in the length direction of the permanent magnet 100, and the adjustment zone 11 can reduce as much as possible the area of ​​the permanent magnet 100 that is not easily demagnetized. That is to say, under the premise of ensuring that the adjustment zone 11 covers the easily demagnetized area on the permanent magnet 100, the area occupied by the non-demagnetized area on the permanent magnet 100 can be made larger, so that the overall remanence of the permanent magnet 100 can be set higher, achieving a balance between remanence and intrinsic coercive force, and can also reduce the amount of heavy rare earth used, thereby reducing the cost of the permanent magnet 100.

[0065] The permanent magnet 100 provided in the embodiment of the present application is compared with the prior art. The permanent magnet 100 provided in the embodiment of the present application is improved in anti-demagnetization ability of the adjustment zone 11 on the permanent magnet 100 by setting an adjustment zone 11 on at least one side of the permanent magnet 100, setting the intrinsic coercive force of the adjustment zone 11 to be larger, and setting the middle part of the adjustment zone 11 to protrude toward the interior of the permanent magnet 100. In addition, the anti-demagnetization ability of the permanent magnet 100 is improved, and the overall remanence of the permanent magnet 100 can be made higher to achieve a balance between remanence and intrinsic coercive force.

[0066] In one embodiment, see Figures 4 to 6 The magnetizing direction of the permanent magnet 100 is parallel to the thickness direction of the permanent magnet 100 , which makes it convenient to magnetize the permanent magnet 100 .

[0067] In one embodiment, the intrinsic coercive force of the adjustment area 11 is uniformly distributed along the magnetization direction, that is, in the thickness direction of the permanent magnet 100, the intrinsic coercive force of the adjustment area 11 is uniformly distributed, which can facilitate the arrangement and processing of the adjustment area 11. Figure 1 Because demagnetization is prone to occur at both ends of the permanent magnet 100 near one side, an adjustment zone can be set at one end of the permanent magnet 100 in the thickness direction, that is, at a position close to one side of the permanent magnet 100, that is, the above-mentioned adjustment zone 11 is set in a part of the thickness of the permanent magnet 100.

[0068] In one embodiment, the adjustment areas 11 on both sides of the permanent magnet 100 (i.e., the sides defined by the length and width) are symmetrically distributed. That is, the adjustment areas 11 are symmetrically distributed on both sides of the permanent magnet 100, which facilitates processing and manufacturing, and facilitates the installation and use of the permanent magnet 100.

[0069] In one embodiment, the adjustment area 11 is symmetrically distributed on two opposite sides of the length direction of the permanent magnet 100. That is, the adjustment area 11 is symmetrically distributed on two opposite sides of the length direction of the permanent magnet 100, which can facilitate the installation and use of the permanent magnet 100. Figure 3 Since the permanent magnet 100 often experiences more obvious demagnetization on one side, an adjustment area 11 may be provided on one side of the permanent magnet 100 .

[0070] In one embodiment, the adjustment region 11 includes a plurality of sub-regions 110, and the sub-regions 110 are sequentially arranged from the corresponding long sides 121 of the permanent magnet 100 toward the middle of the width of the permanent magnet 100. In other words, the sub-regions 110 are sequentially arranged from adjacent long sides 121 toward the middle of the width of the permanent magnet 100. The plurality of sub-regions 110 are provided to facilitate the design and manufacture of the adjustment region 11.

[0071] In one embodiment, the intrinsic coercivity of the plurality of sub-regions 110 decreases sequentially from the corresponding long side 121 of the permanent magnet 100 toward the middle of the width of the permanent magnet 100. In other words, the intrinsic coercivity of the sub-regions 110 decreases sequentially from the adjacent long side 121 toward the middle of the width of the permanent magnet 100. That is, among the plurality of sub-regions 110 in the adjustment zone 11, the intrinsic coercivity of the sub-region 110 close to the adjacent long side 121 is greater than the intrinsic coercivity of the sub-region 110 far from the adjacent long side 121. Because demagnetization is more likely to occur closer to the long side 121 of the permanent magnet 100, the intrinsic coercivity of the sub-region 110 close to the long side 121 is set to be greater. This can increase the remanence of the adjustment zone 11 while ensuring that the permanent magnet 100 has good anti-demagnetization capability, thereby improving the overall remanence of the permanent magnet 100.

[0072] In one embodiment, there are three sub-partitions 110, namely the first sub-partition 111, the second sub-partition 112 and the third sub-partition 113. The first sub-partition 111, the second sub-partition 112 and the third sub-partition 113 are arranged in sequence from the adjacent long side 121 to the middle of the width direction of the permanent magnet 100. That is, the first sub-partition 111, the second sub-partition 112 and the third sub-partition 113 are arranged in sequence from the corresponding long side 121 of the permanent magnet 100 toward the middle of the width of the permanent magnet 100, that is, the first sub-partition 111 is closer to the long side 121 than the second sub-partition 112, and the second sub-partition 112 is closer to the long side 121 than the third sub-partition 113. An adjustment zone 11 includes three sub-areas 110, which can facilitate adjustment of the size of each sub-area 110 and facilitate setting the size and shape of each sub-area 110, thereby facilitating the processing and manufacturing of the permanent magnet 100. In addition, the overall area of ​​the adjustment zone 11 can be set to be smaller, thereby increasing the overall remanence of the permanent magnet 100. It is understandable that the number of sub-areas 110 in an adjustment zone 11 can also be one, two, four, five, etc.

[0073] In one embodiment, the intrinsic coercive force of the first sub-partition 111 ranges from 1890KA / m to 2000KA / m; the intrinsic coercive force of the second sub-partition 112 ranges from 1830KA / m to 1890KA / m; and the intrinsic coercive force of the third sub-partition 113 ranges from 1780KA / m to 1830KA / m. In this way, the intrinsic coercive force of the first sub-partition 111 is the highest, the intrinsic coercive force of the second sub-partition 112 is second, and the intrinsic coercive force of the third sub-partition 113 is third, so that the first sub-partition 111 has a higher anti-demagnetization ability, the second sub-partition 112 has second, and the third sub-partition 113 has third. As a result, the remanence of the third sub-partition 113 can be set higher, the remanence of the second sub-partition 112 is set second, and the remanence of the first sub-partition 111 is set third, thereby improving the overall remanence of the permanent magnet 100.

[0074] In one embodiment, see Figures 4 to 6A plurality of dividing lines 140 are formed on the adjustment region 11 of the permanent magnet 100. The middle portion of each dividing line 140 protrudes toward the interior of the permanent magnet 100 along the width direction of the permanent magnet 100. In other words, each dividing line 140 protrudes toward the middle of the width of the permanent magnet 100 along the length direction of the permanent magnet 100. The ends of each dividing line 140 along the length direction of the permanent magnet 100 are respectively connected to the ends of the adjacent long side 121. In other words, the length of each dividing line 140 along the length direction of the permanent magnet 100 is equal to the length of the permanent magnet 100. The edges of each sub-area 110 form the aforementioned dividing lines 140. In other words, a sub-area 110 is formed between two adjacent dividing lines 140, and a sub-area 110 is formed between the long side of a dividing line 140 and an adjacent dividing line 140. This structure can facilitate the design and production of each sub-partition 110. In addition, the middle part of each dividing line 140 in the length direction is protruded toward the middle part of the width of the permanent magnet 100, so that the middle part of each sub-partition 110 in the length direction can be protruded toward the middle part of the width of the permanent magnet 100 to better cover the easily demagnetized area on the permanent magnet 100, and the area of ​​the sub-partition 110 is set smaller to set the overall residual magnetism of the permanent magnet 100 to be larger.

[0075] In one embodiment, when the intrinsic coercive force of the permanent magnet 100 is uniformly distributed along the magnetization direction (i.e., the thickness direction), each sub-partition 110 forms a three-dimensional structure, and the dividing line 140 extends along the thickness direction of the permanent magnet 100 to form a dividing surface, that is, the edge of each sub-partition 110 is a dividing surface.

[0076] In one embodiment, the plurality of dividing lines 140 include a first dividing line 141, a second dividing line 142, and a third dividing line 143. The first dividing line 141 and the adjacent long side 121 form a first sub-partition 111, the second dividing line 142 and the first dividing line 141 form a second sub-partition 112, and the third dividing line 143 and the second dividing line 142 form a third sub-partition 113. In other words, the area enclosed by the first dividing line 141 and the adjacent long side 121 forms the first sub-partition 111, the area enclosed by the second dividing line 142 and the first dividing line 141 forms the second sub-partition 112, and the area enclosed by the third dividing line 143 and the second dividing line 142 forms the third sub-partition 113. This structure facilitates the arrangement of the first sub-partition 111, the second sub-partition 112, and the third sub-partition 113.

[0077] In one embodiment, each dividing line 140 is in an arc shape, and the center of each dividing line 140 is located on the center line 131 in the width direction of the permanent magnet 100. In this way, each dividing line 140 and the adjacent long side 121 form an arc surface, which facilitates the design of each dividing line 140 and also facilitates the design and production of each sub-area 110. Each dividing line 140 is set in an arc shape, and the first dividing line 141, the second dividing line 142 and the third dividing line 143 are all in an arc shape, which facilitates the design and production of the first dividing line 141, the second dividing line 142 and the third dividing line 143, and further facilitates the design and production of the first sub-area 111, the second sub-area 112 and the third sub-area 113.

[0078] In one embodiment, the length of the permanent magnet 100 is L, the radius of the first dividing line 141 is R1, the radius of the second dividing line 142 is R2, and the radius of the third dividing line 143 is R3, then R1>R2>R3≥L, so that the second dividing line 142 can be surrounded by the side of the first dividing line 141 close to the middle of the width direction of the permanent magnet 100, and the third dividing line 143 can be surrounded by the side of the second dividing line 142 close to the middle of the width direction of the permanent magnet 100.

[0079] In one embodiment, R1=4L, that is, the radius R1 of the first dividing line 141 is 4 times the length L of the permanent magnet 100, so that the first sub-partition 111 formed between the first dividing line 141 and the adjacent long side 121 can be set smaller and ensure that the corresponding easily demagnetized area on the permanent magnet 100 is covered.

[0080] In one embodiment, R2=2L, that is, the radius R2 of the second dividing line 142 is twice the length L of the permanent magnet 100. In this way, the second sub-partition 112 formed by the area enclosed by the second dividing line 142 and the first dividing line 141 can be set smaller and ensure that the corresponding easily demagnetized area on the permanent magnet 100 is covered.

[0081] In one embodiment, R3=1.25L, that is, the radius R3 of the third dividing line 143 is 1.25 times the length L of the permanent magnet 100. In this way, the third sub-partition 113 formed by the area enclosed by the third dividing line 143 and the second dividing line 142 can be set smaller and ensure that the corresponding easily demagnetized area on the permanent magnet 100 is covered.

[0082] In one embodiment, R1=4L, R2=2L, R3=1.25L, so that the first sub-partition 111, the second sub-partition 112 and the third sub-partition 113 can be set to be smaller, and can cover the easily demagnetized area on the permanent magnet 100, so as to set the area of ​​the adjustment area 11 to be smaller, thereby improving the overall residual magnetism of the permanent magnet 100.

[0083] See also Figure 7 and Figure 8 , Figure 7 This is a schematic front view of the permanent magnet 100 provided in this embodiment. Figure 8 For the Figure 7 The cross-sectional view of the center line CC. The structure of the permanent magnet 100 of this embodiment is Figure 4 In this embodiment, the projection of each sub-area 110 on one side of the permanent magnet 100 along the thickness direction of the permanent magnet 100 is rectangular, that is, the projection of each sub-area 110 on two opposite sides of the permanent magnet 100 is rectangular, so as to facilitate the design and production of each sub-area 110 and the processing and production of the permanent magnet 100.

[0084] In one embodiment, the length of the permanent magnet 100 is L, and the width of the permanent magnet 100 is H. The length of the first subarea 111 is L1, and the width of the first subarea 111 is H1. That is, the first subarea 111 covers one side of the permanent magnet 100, and the length of the rectangle is L1 and the width is H1.

[0085] In one embodiment, L1=L, that is, the length L1 of the first sub-division 111 is equal to the length L of the permanent magnet 100. This ensures that the side of the permanent magnet 100 close to the first sub-division 111 has a larger intrinsic coercive force, thereby having good anti-demagnetization performance.

[0086] In one embodiment, 0.1H

[0087] In one embodiment, the length of the second sub-area 112 is L2, and the width of the second sub-area 112 is H2. That is, the length of the rectangle of the second sub-area 112 covering one side of the permanent magnet 100 is L2, and the width is H2.

[0088] ​In one embodiment, 0.4L < L2 < 0.6L. That is to say, the length L2 of the second sub-region 112 is 0.4 to 0.6 of the length L of the permanent magnet 100. This can ensure that the position of the permanent magnet 100 near the middle of its width is covered by the second sub-region 112, making the second sub-region 112 protrude from the middle of the length direction of the first sub-region 111 towards the middle of the width direction of the permanent magnet 100, so as to ensure covering the demagnetized region on the permanent magnet 100 in terms of length. When the length L2 of the second sub-region 112 is less than 0.4L, the length of the second sub-region 112 is too short to cover the corresponding easily demagnetized region on the permanent magnet 100. When the length L2 of the second sub-region 112 is greater than 0.6L, the second sub-region 112 is too long, which will cause the second sub-region 112 to occupy a large area and reduce the overall remanence of the permanent magnet 100.

[0089] In one embodiment, 0.1H < H2 < 0.2H. That is to say, the width H2 of the second sub-region 112 is 0.1 to 0.2 of the width H of the permanent magnet 100. This can make the second sub-region 112 occupy a smaller width on the permanent magnet 100, set the second sub-region 112 narrow, reduce the area of the second sub-region 112, and ensure that the second sub-region 112 well covers the corresponding easily demagnetized region on the permanent magnet 100. When the width H2 of the second sub-region 112 is less than 0.1H, the second sub-region 112 is too narrow to cover the corresponding easily demagnetized region on the permanent magnet 100. When the width H2 of the second sub-region 112 is greater than 0.2H, the second sub-region 112 is too wide, which will cause the second sub-region 112 to occupy a large area and reduce the overall remanence of the permanent magnet 100.

[0090] In one embodiment, the length of the third sub-region 113 is L3, and the width of the third sub-region 113 is H3. That is to say, the length of the rectangle covering one side of the permanent magnet 100 by the third sub-region 113 is L3, and the width is H3.

[0091] In one embodiment, 0.15L < L3 < 0.25L. That is to say, the length L3 of the third sub-region 113 is 0.15 to 0.25 of the length L of the permanent magnet 100. This can ensure that the position of the permanent magnet 100 near the middle of its width is covered by the third sub-region 113, making the third sub-region 113 protrude from the middle of the length direction of the second sub-region 112 towards the middle of the width direction of the permanent magnet 100, so as to ensure covering the demagnetized region on the permanent magnet 100 in terms of length. When the length L3 of the third sub-region 113 is less than 0.15L, the length of the third sub-region 113 is too short to cover the corresponding easily demagnetized region on the permanent magnet 100. When the length L3 of the third sub-region 113 is greater than 0.25L, the third sub-region 113 is too long, which will cause the third sub-region 113 to occupy a large area and reduce the overall remanence of the permanent magnet 100.

[0092] In one embodiment, 0.1H < H3 < 0.2H. That is to say, the width H3 of the third sub-region 113 is 0.1 to 0.2 of the width H of the permanent magnet 100. This can make the third sub-region 113 occupy a smaller width on the permanent magnet 100. By setting the third sub-region 113 to be narrow, the area of the third sub-region 113 can be reduced, and it can be ensured that the third sub-region 113 well covers the corresponding demagnetization-prone region on the permanent magnet 100. When the width H3 of the third sub-region 113 is less than 0.1H, the third sub-region 113 is too narrow to cover the corresponding demagnetization-prone region on the permanent magnet 100. When the width H3 of the third sub-region 113 is greater than 0.2H, the third sub-region 113 is too wide, which will cause the third sub-region 113 to occupy a larger area and reduce the overall remanence of the permanent magnet 100.

[0093] In one embodiment, the width H1 of the first sub-region 111, the width H2 of the second sub-region 112, and the width H3 of the third sub-region 113 can be set to be equal, that is, H1 = H2 = H3, to facilitate the design and manufacture of the first sub-region 111, the second sub-region 112, and the third sub-region 113. It can be understood that the width H1 of the first sub-region 111 and the width H2 of the second sub-region 112 can also be set to be unequal. The width H2 of the second sub-region 112 and the width H3 of the third sub-region 113 can also be set to be unequal. The width H1 of the first sub-region 111 and the width H3 of the third sub-region 113 can also be set to be unequal. Of course, the width H1 of the first sub-region 111 and the width H2 of the second sub-region 112 can also be set to be equal, and the width H2 of the second sub-region 112 and the width H3 of the third sub-region 113 can also be set to be unequal. Or, the width H1 of the first sub-region 111 and the width H2 of the second sub-region 112 can be set to be unequal, and the width H2 of the second sub-region 112 and the width H3 of the third sub-region 113 can be set to be equal. Or, the width H1 of the first sub-region 111 and the width H2 of the second sub-region 112 can be set to be unequal, and the width H1 of the first sub-region 111 and the width H3 of the third sub-region 113 can be set to be equal.

[0094] Please refer to Figure 9 and Figure 10 , Figure 9 which is the front view structural schematic diagram of the permanent magnet 100 provided in this embodiment. Figure 10 is the cross-sectional structural schematic diagram along the Figure 9 center line E-E. The structure of the permanent magnet 100 in this embodiment is Figure 4In this embodiment, each dividing line 140 forms an isosceles triangle with the adjacent long side 121, with the long side 121 serving as the base of the isosceles triangle. This structure facilitates the design of each dividing line 140, and thus the design and fabrication of each sub-area 110. Furthermore, the height of each isosceles triangle in this structure is located at the centerline 131 of the width direction of the permanent magnet 100.

[0095] In one embodiment, the width of the permanent magnet 100 is H, and the height of the first sub-region 111 along the length of the permanent magnet 100 is H1. That is, the maximum distance between the first dividing line 141 and the adjacent long side is H1. The maximum width of the second sub-region 112 along the length of the permanent magnet 100 is H2. That is, the maximum distance between the first dividing line 141 and the second dividing line 142 along the width of the permanent magnet 100 is H2. The maximum width of the third sub-region 113 along the length of the permanent magnet 100 is H3. That is, the maximum distance between the second dividing line 142 and the third dividing line 143 along the width of the permanent magnet 100 is H3. Furthermore, H1 < H2 < H3 ≤ 0.5H. This structure ensures that the adjustment area 11 covers the easily demagnetized area on the permanent magnet 100 while making the first sub-region 111, the second sub-region 112, and the third sub-region 113 smaller. It also facilitates the design of the size and shape of the first sub-region 111, the second sub-region 112, and the third sub-region 113.

[0096] See also Figure 11 , Figure 11 The structure of the permanent magnet 100 provided in this embodiment is shown in FIG. Figure 4 In this embodiment, the adjustment area 11 of the permanent magnet 100 includes two sub-areas 110 , such as the two sub-areas 110 including a first sub-area 111 and a second sub-area 112 , so that the adjustment area 11 can be designed to be smaller.

[0097] See also Figure 12 , Figure 12 The structure of the permanent magnet 100 provided in this embodiment is shown in FIG. Figure 4 In this embodiment, the adjustment area 11 of the permanent magnet 100 includes one sub-area 110 , for example, the adjustment area 11 only includes the first sub-area 111 .

[0098] See also Figure 13 , Figure 13 The structure of the permanent magnet 100 provided in this embodiment is shown in FIG. Figure 12In this embodiment, the permanent magnet 100 is provided with an adjustment area 11 only on one side in the length direction, and the adjustment area 11 includes a sub-area 110 , such as the adjustment area 11 only includes a first sub-area 111 .

[0099] See also Figure 14 , Figure 14 The structure of the permanent magnet 100 provided in this embodiment is shown in FIG. Figure 12 In this embodiment, the permanent magnet 100 is provided with an adjustment area 11 only on one side in the length direction, and the adjustment area 11 includes three sub-areas 110, such as the three sub-areas 110 are respectively a first sub-area 111, a second sub-area 112 and a third sub-area 113.

[0100] See also Figure 15 , Figure 15 The structure of the permanent magnet 100 provided in this embodiment is shown in FIG. Figure 4 In this embodiment, the adjustment area 11 of the permanent magnet 100 includes four sub-areas 110, such as a first sub-area 111, a second sub-area 112, a third sub-area 113, and a fourth sub-area 114. It is understood that the adjustment area 11 may also include five sub-areas 110, six sub-areas 110, and so on.

[0101] See also Figure 16 , Figure 16 The structure of the permanent magnet 100 provided in this embodiment is shown in FIG. Figure 4 In this embodiment, each dividing line 140 and the adjacent long side 121 form an isosceles trapezoid with the long side 121 as the base. This structure facilitates the design of each dividing line 140 and further facilitates the design and production of each sub-partition 110.

[0102] In one embodiment, three dividing lines 140 are formed on the adjustment area 11. The three dividing lines 140 are respectively a first dividing line 141, a second dividing line 142, and a third dividing line 143. The area enclosed by the first dividing line 141 and the adjacent long side 121 forms the first sub-area 111, the area enclosed by the second dividing line 142 and the first dividing line 141 forms the second sub-area 112, and the area enclosed by the third dividing line 143 and the second dividing line 142 forms the third sub-area 113. This structure facilitates the arrangement of the first sub-area 111, the second sub-area 112, and the third sub-area 113.

[0103] See also Figure 17 , Figure 17The structure of the permanent magnet 100 provided in this embodiment is shown in FIG. Figure 4 In this embodiment, each dividing line 140 is in the shape of an elliptical arc, and the ellipse corresponding to each dividing line 140 has the adjacent long side 121 as the major axis, and the minor axis of the ellipse corresponding to each dividing line 140 is located on the center line 131 in the width direction of the permanent magnet 100. This structure facilitates the design of each dividing line 140, and further facilitates the design and production of each sub-division 110.

[0104] In one embodiment, three dividing lines 140 are formed on the adjustment area 11. The three dividing lines 140 are respectively a first dividing line 141, a second dividing line 142, and a third dividing line 143. The area enclosed by the first dividing line 141 and the adjacent long side 121 forms the first sub-area 111, the area enclosed by the second dividing line 142 and the first dividing line 141 forms the second sub-area 112, and the area enclosed by the third dividing line 143 and the second dividing line 142 forms the third sub-area 113. This structure facilitates the arrangement of the first sub-area 111, the second sub-area 112, and the third sub-area 113.

[0105] The present application also provides a rotor structure, please refer to Figure 1 The rotor structure includes the permanent magnet 100 as described in any of the above embodiments. The rotor structure uses the permanent magnet 100 as described in any of the above embodiments, which has the technical effects of the permanent magnet 100 described in the above embodiments, and when the rotor structure is used, it has high efficiency and long service life.

[0106] The present application also provides a permanent magnet motor. Figure 1 The permanent magnet motor includes the permanent magnet 100 as described in any of the above embodiments. The permanent magnet motor uses the permanent magnet 100 as described in any of the above embodiments, and has the technical effects of the permanent magnet 100 described in the above embodiments. In addition, the permanent magnet motor has high efficiency and long service life when in use.

[0107] The present application also provides a permanent magnet motor. Figure 1 The permanent magnet motor includes the rotor structure described in the above embodiment. The permanent magnet motor uses the rotor structure described in the above embodiment and has the technical effects of the rotor structure described in the above embodiment. In addition, the permanent magnet motor has high efficiency and long service life when in use.

[0108] The present application also provides a compressor, please refer to Figure 1The compression mechanism includes the permanent magnet 100 as described in any of the above embodiments. The compressor uses the permanent magnet 100 as described in any of the above embodiments, which has the technical effects of the permanent magnet 100 described in the above embodiments, and the compressor has high operating efficiency, long service life, and is more energy-efficient.

[0109] The present application also provides a compressor, please refer to Figure 1 The compressor comprises the rotor structure described in the above embodiment. The compressor uses the rotor structure described in any of the above embodiments, and has the technical effects of the rotor structure described in the above embodiments. In addition, the compressor has high operating efficiency, long service life, and is more energy-efficient.

[0110] The present application also provides a compressor, please refer to Figure 1 The compression mechanism includes the permanent magnet motor described in the above embodiment. This compressor uses the permanent magnet motor described in any of the above embodiments, and has the technical effects of the permanent magnet motor described in the above embodiments, and the compressor has high operating efficiency, long service life, and is more energy-efficient.

[0111] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A permanent magnet for use in a motor of a compressor, wherein the permanent magnet has two long sides located on opposite sides of its central axis, characterized in that: On at least one side of the permanent magnet with respect to the central axis, an adjustment area is provided. The intrinsic coercivity of the adjustment area is greater than that of other areas on the permanent magnet. The adjustment area extends from the corresponding long side towards the middle direction of the width of the permanent magnet, and the adjustment area protrudes towards the inside of the permanent magnet in the width direction at the middle of the length of the permanent magnet; the adjustment area includes a plurality of sub-areas, and the plurality of sub-areas are arranged in sequence from the corresponding long side towards the middle direction of the width of the permanent magnet, so that the dimension of the adjustment area as a whole in the width direction of the permanent magnet decreases from the middle of the length of the permanent magnet to both ends of the length of the permanent magnet.

2. The permanent magnet according to claim 1, wherein: The intrinsic coercivity of the plurality of sub-areas decreases in sequence from the corresponding long side towards the middle direction of the width of the permanent magnet.

3. The permanent magnet according to claim 2, wherein: The plurality of sub-areas include a first sub-area, a second sub-area, and a third sub-area, and the first sub-area, the second sub-area, and the third sub-area are arranged in sequence from the corresponding long side of the permanent magnet towards the middle direction of the width of the permanent magnet.

4. The permanent magnet according to claim 3, wherein: The range of the intrinsic coercivity of the first sub-area is 1890 KA / m - 2000 KA / m; the range of the intrinsic coercivity of the second sub-area is 1830 KA / m - 1890 KA / m; the range of the intrinsic coercivity of the third sub-area is 1780 KA / m - 1830 KA / m.

5. The permanent magnet according to claim 3, wherein: The projection of each sub-area on one surface of the permanent magnet in the thickness direction of the permanent magnet is rectangular. The length of the permanent magnet is L, and the width of the permanent magnet is H; the length of the first sub-area is L1, and the width of the first sub-area is H1, then L1 = L, 0.1H < H1 < 0.2H; the length of the second sub-area is L2, and the width of the second sub-area is H2, then 0.4L < L2 < 0.6L, 0.1H < H2 < 0.2H; the length of the third sub-area is L3, and the width of the third sub-area is H3, then 0.15L < L3 < 0.25L, 0.1H < H3 < 0.2H.

6. The permanent magnet according to claim 3, wherein: A plurality of dividing lines are formed on the adjustment area. The middle of each dividing line protrudes towards the inside of the permanent magnet in the width direction of the permanent magnet, and both ends of each dividing line in the length direction of the permanent magnet are respectively connected to both ends of the adjacent long side; the plurality of dividing lines include a first dividing line, a second dividing line, and a third dividing line. The area enclosed by the first dividing line and the adjacent long side forms the first sub-area, the area enclosed by the second dividing line and the first dividing line forms the second sub-area, and the area enclosed by the third dividing line and the second dividing line forms the third sub-area.

7. The permanent magnet according to claim 6, wherein: Each dividing line is arc-shaped, and the center of each dividing line is located on the center line in the width direction of the permanent magnet.

8. The permanent magnet according to claim 7, wherein: The length of the permanent magnet is L, the radius of the first dividing line is R1, the radius of the second dividing line is R2, and the radius of the third dividing line is R3, then R1 > R2 > R3 ≥ L.

9. The permanent magnet according to claim 8, wherein: R1=4L, R2=2L, R3=1.25L.

10. The permanent magnet according to claim 6, wherein: Each of the dividing lines and the adjacent long side forms an isosceles triangle with the long side as the base.

11. The permanent magnet according to claim 10, wherein: The width of the permanent magnet is H, the height of the first sub-partition along the length direction of the permanent magnet is H1, the maximum width of the second sub-partition along the length direction of the permanent magnet is H2, and the maximum width of the third sub-partition along the length direction of the permanent magnet is H3, then H1<H2<H3≤0.5H.

12. The permanent magnet according to claim 6, wherein: Each of the separation lines is in the shape of an elliptical arc with the long axis being adjacent to the long side, and the short axis of each of the separation lines is located on the center line of the permanent magnet in the width direction.

13. The permanent magnet according to claim 6, wherein: Each of the dividing lines and the adjacent long side forms an isosceles trapezoid with the long side as the base.

14. The permanent magnet according to any one of claims 1 to 13, characterized in that: The magnetization direction of the permanent magnet is parallel to the thickness direction of the permanent magnet, and the intrinsic coercive force of the adjustment area is uniformly distributed along the magnetization direction.

15. The permanent magnet according to any one of claims 1 to 13, characterized in that: The adjustment areas are symmetrically distributed on two sides of the permanent magnet.

16. The permanent magnet according to any one of claims 1 to 13, characterized in that: The adjustment areas are symmetrically distributed on two opposite sides in the length direction of the permanent magnet.

17. A rotor structure, characterized in that: The method comprises the permanent magnet according to any one of claims 1 to 16.

18. A permanent magnet motor, characterized in that: The method comprises the permanent magnet according to any one of claims 1 to 16.

19. A compressor, characterized in that: The method comprises the permanent magnet according to any one of claims 1 to 16.

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