A rotor with 3D diffused magnets and its application

Abstract

The present invention discloses a rotor with a 3D diffused magnet and its application, wherein the rotor includes an iron core, a 3D diffused magnet, and a magnetic isolation bridge. The iron core is provided with a magnet slot. The 3D diffused magnet is arranged in the magnet slot. The 3D diffused magnet has a width of w mm, a thickness of h mm, and a minimum distance D2 mm from the axis of the rotor. The 3D diffused magnet includes a non-diffusion region and a plurality of diffusion regions. The heavy rare earth content in the diffusion region is greater than that in the non-diffusion region. A cross section is formed perpendicular to the axis of the iron core. In the cross section, the area of ​​any diffusion region is S mm. 2 The magnetic isolation bridge is located on the side of the magnet slot that is away from the axis of the iron core. The maximum distance between the magnetic isolation bridge and the rotor axis is D1 mm. The rotor provided by the present invention satisfies a specific mathematical relationship in the above parameters, effectively improving performance in terms of anti-demagnetization and other aspects at the lowest possible cost. The present invention also provides applications of the above rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor with a 3D diffused magnet and applications thereof. Background Art

[0002] Currently, compressors used in temperature control equipment such as air conditioners are primarily variable-frequency motors, which typically utilize permanent magnet motors. The rotors of permanent magnet motors are excited by permanent magnets, commonly rare earth permanent magnets. Specifically, these magnets contain a certain amount of heavy rare earth elements such as praseodymium and neodymium. While these permanent magnets exhibit excellent demagnetization resistance, heavy rare earth elements are limited in reserves and expensive. Furthermore, products such as rotors, motors, and compressors incorporating these traditional permanent magnets are also expensive.

[0003] In order to alleviate the problems of raw material sources and high costs, some technologies have been adopted to reduce the heavy rare earth content in permanent magnets. However, the anti-demagnetization ability of the resulting permanent magnets is weakened, and the anti-demagnetization ability decreases more significantly with the increase of the power density of the permanent magnet motor. When the permanent magnet undergoes irreversible demagnetization, it affects the operating performance and reliability of the motor and compressor, and seriously affects the service life of the product.

[0004] In summary, reducing the cost of components used in permanent magnet motors as much as possible while ensuring reliable operation of the motor is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a rotor with 3D diffused magnets, which can effectively improve the anti-demagnetization performance of the resulting rotor while maintaining the same cost.

[0006] The present invention also provides a motor, a compressor and a temperature regulating device comprising the rotor.

[0007] According to an embodiment of the first aspect of the present invention, a rotor having a 3D diffused magnet is provided, wherein the pole arc coefficient of the rotor is β; the rotor has:

[0008] an iron core, wherein the iron core is provided with a magnet slot;

[0009] a 3D diffused magnet, the 3D diffused magnet being disposed in the magnet slot;

[0010] The 3D diffused magnet has a width of w mm, a thickness of h mm, and a closest distance from the axis of the rotor of D2 mm.

[0011] The 3D diffusion magnet consists of a non-diffusion zone and several diffusion zones, wherein the heavy rare earth content in the diffusion zone is greater than that in the non-diffusion zone; a cross section is formed perpendicular to the axis of the iron core, and on the cross section, the area of ​​any diffusion zone is S mm 2 ;

[0012] A magnetic isolation bridge, the magnetic isolation bridge being provided on a side of the magnet slot away from the axis of the iron core, the maximum distance between the magnetic isolation bridge and the axis of the rotor being D1 mm;

[0013] and:

[0014]

[0015] Where a is 0 or 1, 0.03≤k i ≤9.1.

[0016] The rotor according to the embodiment of the present invention has at least the following beneficial effects:

[0017] The fundamental reason for the price increase of permanent magnets and motors including permanent magnets is the price increase of heavy rare earth elements. The content of heavy rare earth elements will affect the remanence and coercive force of permanent magnets (positive correlation). The coercive force is directly reflected in the anti-demagnetization ability. When the permanent magnets are of the same size and equipped with the same motor (rotor), permanent magnets with low coercive force have poor anti-demagnetization ability of the rotor, and the risk of rotor demagnetization is higher and the demagnetization is more obvious.

[0018] Through extensive experiments, the inventors discovered that the design of key dimensions in a motor can affect the overall demagnetization resistance of the resulting rotor, and even the rotor's electrodes. For example, if the permanent magnets have the same material quality, smaller width w and thickness h of the permanent magnets result in poorer demagnetization resistance. A larger thickness of the magnetic isolation bridge (the numerical relationship between D1, D2, and w) results in a lower magnetic flux leakage coefficient, better demagnetization resistance, and a relatively weaker reverse magnetic field. Similarly, the pole arc coefficient is a key parameter in motor design, directly affecting the air gap flux density waveform. As the pole arc coefficient increases, the air gap flux density distribution gradually changes from a sinusoidal wave to a square wave, improving the square wave characteristics of the motor's back EMF, reducing torque ripple, and increasing motor operation. However, blindly pursuing a large pole arc coefficient during the design process can result in a smaller rotor magnetic isolation bridge, increasing magnetic flux leakage in the brushless DC motor. Furthermore, if the rotor structure design has poor overall demagnetization resistance, a larger diffusion zone is required to ensure reliability. Conversely, if the rotor structure design has good overall demagnetization resistance, a smaller diffusion zone can be designed.

[0019] Furthermore, the inventors found that if the parameters such as the rotor structure design, the area of ​​the diffusion zone and the size of the 3D diffusion magnet are restricted to the relationship in formula (I), and k is limited to iThe value range of can be achieved by adding a small amount of heavy rare earth elements in the diffusion zone, thereby improving the local anti-demagnetization performance of the 3D diffused magnet, and finally achieving a significant improvement in the anti-demagnetization performance of the rotor, that is, on the basis of saving costs, the comprehensive performance of the obtained rotor is improved to the greatest extent; or after reducing the heavy rare earth content in the non-diffusion zone, the anti-demagnetization performance of the obtained rotor can still be basically maintained, that is, on the basis of ensuring the performance of the rotor, its preparation cost is reduced as much as possible.

[0020] According to some embodiments of the present invention, the number of pole pairs of the rotor p is ≥ 2, for example, it can be 3, 4 or 5.

[0021] That is, the rotor has 4, 6, 8 or 10 magnetic poles in total.

[0022] According to some embodiments of the present invention, the pole arc coefficient β is a ratio between a central angle A corresponding to the 3D diffuse magnet in each magnetic pole and B=360 / 2P (β=A / B).

[0023] The vertex of the central angle is the axis of the iron core.

[0024] According to some embodiments of the present invention, the pole arc coefficient β has a value range of 0.8-0.95.

[0025] According to some embodiments of the present invention, the value range of β is 0.84 to 0.88; for example, it may be approximately 0.8417.

[0026] According to some embodiments of the present invention, the iron core is formed by stacking a plurality of silicon steel sheets.

[0027] According to some embodiments of the present invention, the width of the 3D diffusion magnet, w mm, ranges from 15 mm to 30 mm.

[0028] According to some embodiments of the present invention, the value range of w mm is 16 mm to 20 mm, for example, it may be approximately 18 mm.

[0029] According to some embodiments of the present invention, the thickness of the 3D diffusion magnet, h mm, ranges from 2.1 mm to 3.5 mm.

[0030] According to some embodiments of the present invention, the value range of h mm is 2.2 mm to 3.0 mm, for example, it may be approximately 2.5 mm.

[0031] According to some embodiments of the present invention, the minimum distance D2mm between the 3D diffused magnet and the axis of the rotor is in the range of 15 mm to 35 mm.

[0032] According to some embodiments of the present invention, the value range of D2 mm is 25 mm to 30 mm; for example, it may be approximately 39.8 mm.

[0033] According to some embodiments of the present invention, the maximum distance D1 mm between the magnetic isolation bridge and the axis of the rotor is in the range of 30 mm to 44 mm.

[0034] According to some embodiments of the present invention, the value range of D1 mm is 38-42 mm, for example, specifically about 41.8 mm.

[0035] According to some embodiments of the present invention, the area of ​​any diffusion region on the cross section is between 1 and 45 mm. 2 between.

[0036] According to some embodiments of the present invention, the area of ​​any of the diffusion regions on the cross section is between 5 and 15 mm. 2 between.

[0037] According to some embodiments of the present invention, the area of ​​any of the diffusion regions on the cross section is between 10 and 11 mm. 2 between.

[0038] Generally, a larger diffusion region area results in greater demagnetization resistance, but this also translates to higher intrinsic coercivity and the required heavy rare earth content, leading to higher costs. However, if the diffusion region area is too small, demagnetization resistance may not be achieved. Therefore, limiting the diffusion region area to the above range can achieve a balance between cost and demagnetization resistance.

[0039] According to some embodiments of the present invention, the 3D diffusion magnet is radially magnetized.

[0040] According to some embodiments of the present invention, the 3D diffusion magnet is parallel magnetized.

[0041] According to some embodiments of the present invention, the directions of the magnetic forces in the diffusion region and the non-diffusion region are consistent along the length direction of the 3D diffusion magnet.

[0042] According to some embodiments of the present invention, the heavy rare earth includes at least one of Dy and Tb.

[0043] The higher the heavy metal content in a 3D diffused magnet, the higher its coercivity and the better its demagnetization resistance. Therefore, increasing the heavy rare earth content in the diffusion zone can improve the demagnetization resistance of the resulting rotor.

[0044] According to some embodiments of the present invention, the mass percentage of the heavy rare earth in the diffusion zone is 0.59% to 2%.

[0045] According to some embodiments of the present invention, the mass percentage of the heavy rare earth in the diffusion zone is 0.59% to 1.25%;

[0046] According to some embodiments of the present invention, the mass percentage of the heavy rare earth in the diffusion zone is 1.05% to 2.0%.

[0047] According to some embodiments of the present invention, the mass percentage of the heavy rare earth in the non-diffusion zone is 0.0% to 0.53%.

[0048] According to some embodiments of the present invention, the heavy rare earth is evenly distributed in the diffusion zone.

[0049] According to some embodiments of the present invention, the distribution of heavy rare earth in the diffusion region is non-uniform.

[0050] Whether the distribution is uniform is related to the method of increasing the content of heavy rare earth. Whether it is uniform has no obvious effect on the performance of the resulting rotor. In actual working conditions, whether the distribution of heavy rare earth in the diffusion zone is uniform can be selected according to actual conditions.

[0051] According to some embodiments of the present invention, the heavy rare earth in the diffusion zone is distributed nearly linearly, that is, the distance of a certain position from the edge of the diffusion zone is almost linearly correlated with the concentration of the heavy rare earth in the position.

[0052] According to some embodiments of the present invention, the difference in intrinsic coercivity between the diffusion region and the non-diffusion region is 90-150 kA / m.

[0053] According to some embodiments of the present invention, a method for achieving the difference in intrinsic coercivity between the diffusion region and the non-diffusion region is to reduce the intrinsic coercivity of the non-diffusion region.

[0054] According to some embodiments of the present invention, a method for achieving the difference in intrinsic coercivity between the diffusion region and the non-diffusion region is to increase the intrinsic coercivity of the diffusion region.

[0055] According to some embodiments of the present invention, the diffusion region has a regular shape; for example, it is a plurality of cylinders or a plurality of prisms formed along the length direction of the 3D diffusion magnet;

[0056] Thus, in any cross section formed perpendicular to the axis of the core, as long as the diffusion region is shown, the shape of the diffusion region is the same.

[0057] According to some embodiments of the present invention, the diffusion region is irregular in shape;

[0058] Thus, among the multiple cross sections formed perpendicular to the axis of the core, the shapes of the diffusion region displayed on at least two cross sections are different.

[0059] According to some embodiments of the present invention, the diffusion region runs through the length direction of the 3D diffusion magnet;

[0060] That is, the diffusion region is shown in each cross section formed perpendicular to the axis of the core.

[0061] According to some embodiments of the present invention, the diffusion region does not extend through the length direction of the 3D diffusion magnet;

[0062] That is, among a plurality of cross sections formed perpendicular to the axis of the core, the diffusion region is not shown on at least one cross section.

[0063] According to some embodiments of the present invention, a maximum length of the diffusion region along the length direction of the 3D diffusion magnet is 25% to 100% of the length of the 3D diffusion magnet.

[0064] According to some embodiments of the present invention, in the cross section, the 3D diffusion magnets are arranged in a V-shape, and a=1.

[0065] According to some embodiments of the present invention, in the cross section, the 3D diffused magnets are arranged in a straight line, and a=0.

[0066] According to some embodiments of the present invention, 0.03≤k i ≤5.8.

[0067] According to some embodiments of the present invention, 0.3≤k i ≤1.

[0068] According to some embodiments of the present invention, 0.3≤k i ≤0.4.

[0069] It should be noted that in k i , and the subsequent k ii and k iii When performing calculations, only L max ,D1,h,D2,2 a The absolute values ​​corresponding to , w, and β are involved in the calculation, and the units are not involved in the calculation.

[0070] According to some embodiments of the present invention, on the cross section, the maximum length of any diffusion region along the width direction of the 3D diffusion magnet is L max mm ;and,

[0071]

[0072] Among them, 0.018≤k ii ≤5.74. According to some embodiments of the present invention, 0.03≤k ii ≤5.74.

[0073] According to some embodiments of the present invention, 0.2≤k ii ≤1.

[0074] According to some embodiments of the present invention, 0.2≤k ii ≤0.25.

[0075] According to some embodiments of the present invention, L max The value range is 1 to 10 mm.

[0076] According to some embodiments of the present invention, L max The value range is 4 to 5 mm.

[0077] According to some embodiments of the present invention, on the cross section, the maximum length of the diffusion region along the thickness direction of the 3D diffusion magnet is W max mm ;and,

[0078]

[0079] Where, 0.02≤k iii ≤3.0.

[0080] According to some embodiments of the present invention, 0.03≤k iii ≤3.0.

[0081] According to some embodiments of the present invention, 0.2≤k iii ≤1.

[0082] According to some embodiments of the present invention, 0.25≤k iii ≤0.3.

[0083] According to some embodiments of the present invention, W max The value range of mm is 1 to 3 mm, for example, it can be about 2.5 mm.

[0084] According to some embodiments of the present invention, on the cross section, the number of the diffusion regions is 1 to 5, for example, 1, 2, 3, 4 or 5.

[0085] According to some embodiments of the present invention, in the cross section, the diffusion region includes a first diffusion region and a second diffusion region.

[0086] According to some embodiments of the present invention, the first diffusion region and the second diffusion region are distributed at both ends of the 3D diffusion magnet in a width direction.

[0087] According to some embodiments of the present invention, the first diffusion region and the second diffusion region have the same shape.

[0088] According to some embodiments of the present invention, the first diffusion region and the second diffusion region have different shapes.

[0089] According to some embodiments of the present invention, when the first diffusion region does not extend through the length direction of the 3D diffusion magnet, the first diffusion region includes two first diffusion sub-regions; the two first diffusion sub-regions are distributed at both ends of the length direction of the 3D diffusion magnet.

[0090] Likewise, when the second diffusion region does not extend through the length direction of the 3D diffusion magnet, the second diffusion region includes two second diffusion sub-regions; the two second diffusion sub-regions are distributed at both ends of the length direction of the 3D diffusion magnet.

[0091] According to some embodiments of the present invention, a cross section is formed perpendicular to the axis of the core, and on the cross section, the area of ​​the first diffusion zone is S1 mm 2 , the area of ​​the second diffusion region is S2 mm 2 ,and:

[0092]

[0093]

[0094] Among them, 0.03≤k1≤9.1; 0.03≤k2≤9.1.

[0095] According to some embodiments of the present invention, 0.03≤k1≤5.8; 0.03≤k2≤5.8.

[0096] According to some embodiments of the present invention, 0.3≤k1≤1; 0.3≤k2≤3.

[0097] According to some embodiments of the present invention, 0.3≤k1≤0.4, 0.3≤k2≤0.4.

[0098] According to some embodiments of the present invention, the value range of S1 and S2 is 1-45.

[0099] According to some embodiments of the present invention, the value range of S1 and S2 is 5-15.

[0100] According to some embodiments of the present invention, S1 and S2 are not equal.

[0101] According to some embodiments of the present invention, S1=S2.

[0102] According to some embodiments of the present invention, when S1 = S2 = 10, within the test range of the present invention, the obtained rotor has a better cost performance (suitable price and optimal anti-demagnetization performance).

[0103] According to some embodiments of the present invention, on the cross section, the maximum length of any diffusion region along the width direction of the 3D diffusion magnet is L1max mm ;and,

[0104]

[0105] Among them, 0.018≤k3≤5.74.

[0106] According to some embodiments of the present invention, the maximum length of the second diffusion region along the width direction of the 3D diffusion magnet is L 2max mm ;and,

[0107]

[0108] Among them, 0.018≤k4≤5.74.

[0109] According to some embodiments of the present invention, the value range of k3 and k4 is 0.03 to 5.74.

[0110] According to some embodiments of the present invention, the value range of k3 and k4 is 0.2-1.

[0111] According to some embodiments of the present invention, the value range of k3 and k4 is 0.2 to 0.25.

[0112] According to some embodiments of the present invention, k3 and k4 are equal or unequal.

[0113] According to some embodiments of the present invention, L 1max mm and L 2max The value range of mm is 1 to 10 mm.

[0114] According to some embodiments of the present invention, L 1max mm and L 2max The value range of mm is 4 to 5 mm.

[0115] According to some embodiments of the present invention, L 1max and L 2max Equal or unequal.

[0116] According to some embodiments of the present invention, the maximum length of the first diffusion region along the thickness direction of the 3D diffusion magnet is W 1max mm ;and,

[0117]

[0118] Among them, 0.02≤k5≤3.0.

[0119] According to some embodiments of the present invention, the maximum length of the second diffusion region along the thickness direction of the 3D diffusion magnet is W 2max mm ;and,

[0120]

[0121] Among them, 0.02≤k6≤3.0.

[0122] According to some embodiments of the present invention, the value range of k5 and k6 is 0.03 to 3.0.

[0123] According to some embodiments of the present invention, the value range of k5 and k6 is 0.2-1.

[0124] According to some embodiments of the present invention, the value range of k5 and k6 is 0.25 to 0.3.

[0125] According to some embodiments of the present invention, k5 and k6 are equal or unequal.

[0126] According to some embodiments of the present invention, W 1max mm and W 2max mm The value range of is 1 to 3 mm, for example, it can be about 2.5 mm.

[0127] According to some embodiments of the present invention, W 1max and W 2max Equal or unequal.

[0128] According to some embodiments of the present invention, the diffusion region further includes a third diffusion region.

[0129] According to some embodiments of the present invention, a size of the third diffusion region in the cross section satisfies formula (I).

[0130] According to some embodiments of the present invention, a size of the third diffusion region in the cross section satisfies formulas (II) to (II).

[0131] According to some embodiments of the present invention, the content of heavy rare earth in the third diffusion region is higher than the content of heavy rare earth in the non-diffusion region.

[0132] According to some embodiments of the present invention, the mass percentage of heavy rare earth in the third diffusion zone is 0.59%-2.0%.

[0133] According to some embodiments of the present invention, along a width direction of the 3D diffusion magnet, the third diffusion region is located between the first diffusion region and the second diffusion region.

[0134] According to some embodiments of the present invention, the third diffusion region consists of one or more third diffusion sub-regions.

[0135] According to some embodiments of the present invention, the third diffusion region has the same shape in multiple cross sections, that is, the shape of the third diffusion region is regular.

[0136] According to some embodiments of the present invention, the third diffusion region has different shapes in at least two cross sections, that is, the shape of the third diffusion region is irregular.

[0137] According to some embodiments of the present invention, the third diffusion region may be displayed on a cross section extending along a length direction of the 3D diffusion magnet, that is, perpendicular to the axis of the core.

[0138] According to some embodiments of the present invention, the third diffusion region does not run through the length direction of the 3D diffusion magnet, that is, the third diffusion region is not shown on at least one cross section formed perpendicular to the axis of the core.

[0139] According to some embodiments of the present invention, the third diffusion region includes two third diffusion sub-regions.

[0140] According to some embodiments of the present invention, two third diffusion sub-regions are distributed at both ends of the 3D diffusion magnet in a length direction.

[0141] According to an embodiment of the second aspect of the present invention, a motor is provided, comprising the rotor.

[0142] The motor according to the embodiment of the present invention has at least the following beneficial effects:

[0143] Since the rotor used in the motor has high anti-demagnetization performance and low manufacturing cost, the motor also has a reasonable structural design, thereby achieving high anti-demagnetization performance while reducing the manufacturing cost as much as possible.

[0144] According to some embodiments of the present invention, the motor further includes a stator.

[0145] According to some embodiments of the present invention, the stator matches the rotor and is disposed around the rotor.

[0146] According to an embodiment of the third aspect of the present invention, a compressor is provided, wherein the motor includes the motor described above.

[0147] Since the compressor adopts all the technical solutions of the motor in the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the motor in the above embodiment.

[0148] According to an embodiment of a fourth aspect of the present invention, a temperature regulating device is provided. The temperature regulating device includes the motor or the compressor.

[0149] Since the temperature regulating device adopts all the technical solutions of the compressor in the above embodiment, it has at least all the beneficial effects brought about by the technical solutions of the compressor in the above embodiment.

[0150] According to some embodiments of the present invention, the temperature regulating device includes at least one of a refrigerator and an air conditioner.

[0151] Unless otherwise specified, the term “about” in the present invention actually means that the error is allowed to be within the range of ±2%, for example, about 100 actually means 100±2%×100.

[0152] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0153] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0154] Figure 1 It is a schematic structural diagram of the rotor provided in Example 1 of the present invention.

[0155] Figure 2 This is a dimension identification diagram of the rotor provided in Example 1 of the present invention.

[0156] Figure 3 yes Figure 1 A partial enlarged schematic diagram.

[0157] Figure 4 It is a schematic structural diagram of the rotor provided in Example 2 of the present invention.

[0158] Figure 5 This is a dimension identification diagram of the rotor provided in Example 1 of the present invention.

[0159] Figure 6 yes Figure 4 A partial enlarged schematic diagram.

[0160] Figure 7 Schematic diagram of the structure of the 3D diffusion magnet used in Examples 3 and 4 of the present invention.

[0161] Figure 8 Schematic diagram of the structure of the 3D diffusion magnet used in Examples 5 and 6 of the present invention;

[0162] Figure 9 yes Figure 8 Schematic diagram of the cross section in the AA` direction;

[0163] Figure 10 yes Figure 8 Schematic diagram of the cross section in the middle BB` direction;

[0164] Figure 11 Schematic diagram of the structure of the 3D diffusion magnet used in Examples 7 and 8 of the present invention;

[0165] Figure 12 yes Figure 11 Schematic diagram of the cross section in the AA` direction;

[0166] Figure 13 yes Figure 11 Schematic diagram of the cross section in the middle BB` direction;

[0167] Figure 14 Schematic diagram of the structure of the 3D diffusion magnet used in Example 9 and Example 10 of the present invention;

[0168] Figure 15 Schematic diagram of the structure of the 3D diffusion magnet used in Example 11 and Example 12 of the present invention;

[0169] Figure 16 Schematic diagram of the structure of the 3D diffusion magnet used in Example 13 and Example 14 of the present invention;

[0170] Figure 17 This is a structural diagram of the motor provided in Example 16 of the invention.

[0171] Reference numerals:

[0172] Iron core 110, magnet slot 111;

[0173] 3D diffusion magnet 120 , diffusion region 121 , first diffusion region 1211 , second diffusion region 1212 , third diffusion region 1213 ;

[0174] Magnetic isolation bridge 130.

[0175] Stator 200. DETAILED DESCRIPTION

[0176] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0177] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0178] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0179] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0180] Example 1

[0181] This embodiment provides a rotor with 3D diffused magnets. The specific structure is as follows: Figures 1 to 3 As shown, the specific composition and size restrictions are:

[0182] The rotor includes an iron core 110 , and the iron core 110 is provided with magnet slots 111 ;

[0183] 3D diffused magnet 120 , the 3D diffused magnet 120 is disposed in the magnet slot 111 ;

[0184] The magnetic isolation bridge 130 is disposed on a side of the magnet slot 111 away from the axis of the iron core 110 .

[0185] The pole arc coefficient β of the rotor is the ratio between the central angle A of the 3D diffused magnet in each pole and B = 360 / 2P (β = A / B, as Figure 2 shown).

[0186] The 3D diffused magnet 120 has a width of w mm, a thickness of h mm, and a minimum distance from the axis of the rotor of D2 mm.

[0187] In this embodiment, the 3D diffusion magnet 120 is composed of a non-diffusion region and two diffusion regions 121 , wherein the two diffusion regions 121 are a first diffusion region 1211 and a second diffusion region 1212 ;

[0188] The heavy rare earth content in the diffusion region 121 is greater than the heavy rare earth content g3 in the non-diffusion region;

[0189] The cross section is formed along the axis of the vertical core 110. In the cross section, the area of ​​the first diffusion region 1211 is S1 mm. 2 The area of ​​the second diffusion region 1212 is S2 mm 2 .

[0190] The maximum distance between the magnetic isolation bridge 130 and the axis of the rotor is D1 mm;

[0191] And S1 and S2 should satisfy the following formulas respectively:

[0192]

[0193] Where 0.03≤k i ≤9.1.

[0194] In this embodiment, the 3D diffused magnets 120 are arranged in a line, and a=0.

[0195] It can be understood that, in the above cross section, the maximum length of the first diffusion region 1211 along the width direction of the 3D diffusion magnet 120 is L 1max mm The maximum length of the second diffusion region 1212 along the width direction of the 3D diffusion magnet 120 is L 2max mm ; and, L 1max and L 2max Replace L in the following formula max After that, the mathematical relationship of (II) constraint should still be satisfied:

[0196]

[0197] Among them, 0.018≤k ii ≤5.74.

[0198] It can be further understood that, in the above cross section, the maximum length of the first diffusion region 1211 along the thickness direction of the 3D diffusion magnet 120 is W. 1max mm The maximum length of the second diffusion region 1212 along the thickness direction of the 3D diffusion magnet 120 is W 2max mm ; and, respectively, W 1max and W 2max Replace W in the following formula max After that, the mathematical relationship of (III) constraint should still be satisfied:

[0199]

[0200] Where, 0.02≤k iii ≤3.0.

[0201] It can be understood that the number of magnetic pole pairs of the motor in this embodiment is 3 pairs.

[0202] It can be understood that the content of heavy rare earth in the first diffusion region 1211 is g1, and the content of heavy rare earth in the second diffusion region 1212 is g2.

[0203] It is understandable that the shape of the diffusion region 121 in this embodiment is irregular, that is, a plurality of cross sections are formed perpendicular to the axis of the core 110 , and the shapes of the diffusion region 121 (including the first diffusion region 1211 and the second diffusion region 1212 ) shown in at least two cross sections are different.

[0204] It can be further understood that in this embodiment, the diffusion region 121 is viewed along the length direction of the 3D diffusion magnet 120 , that is, on any cross section, the first diffusion region 1211 and the second diffusion region 1212 can be displayed.

[0205] It can be understood that the content of heavy rare earth in the first diffusion region 1211 and the second diffusion region 1212 is equal and uniformly distributed.

[0206] It can be further understood that in the non-diffusion zone, the heavy rare earth is also evenly distributed.

[0207] It is understandable that in the 3D diffusion magnet 120 , the direction of the magnetic force is consistent, specifically, along the length direction of the 3D diffusion magnet 120 .

[0208] Example 2

[0209] This embodiment provides a rotor with 3D diffused magnets. The specific structure is as follows: Figures 4-6 As shown, the specific composition and size limitations differ from those of Example 1 in that:

[0210] (1) In this embodiment, the 3D diffusion magnets 120 are arranged in a V-shape, so a=1 in equations (I) to (III).

[0211] (2) The number of magnetic pole pairs of the rotors provided in this embodiment and in embodiment 1 is the same. However, due to the difference in the arrangement of the 3D diffused magnets 120 , the number of 3D diffused magnets 120 used in this embodiment is twice that of embodiment 1.

[0212] Example 3

[0213] This embodiment provides a rotor with a 3D diffused magnet. The structural diagram of the adopted 3D diffused magnet is shown in FIG. Figure 7 As shown, the specific composition and size limitations of the provided rotor differ from those of Example 1 in that:

[0214] In the 3D diffusion magnet 120 used in this embodiment, a third diffusion region 1213 is formed between the first diffusion region 1211 and the second diffusion region 1212 ;

[0215] The area of ​​the third diffusion region 1213 is S3 mm 2 The maximum length along the width direction of the 3D diffusion magnet 120 is L 3max The maximum length along the thickness direction of the 3D diffusion magnet 120 is W3max , and S3 must satisfy formula (I), L 3max Must satisfy formula (II), W 3max Formula (III) must be satisfied.

[0216] It can be understood that the third diffusion region 1213 is irregular in shape, with different shapes in at least two cross sections, and runs through the length direction of the 3D diffusion magnet 120 .

[0217] It is understandable that the content of heavy rare earth in the third diffusion region 1213 is g i .

[0218] Example 4

[0219] This embodiment provides a rotor with a 3D diffused magnet, which differs from Embodiment 3 in that:

[0220] In this embodiment, the 3D diffused magnets 120 are arranged in a V-shape, so a=1 in equations (I) to (III) and the number of 3D diffused magnets 120 used is twice that of embodiment 3.

[0221] Example 5

[0222] This embodiment provides a rotor with a 3D diffused magnet. The structural diagram of the adopted 3D diffused magnet is shown in FIG. Figures 8-10 As shown, the specific composition and size limitations of the provided rotor differ from those of Example 1 in that:

[0223] The 3D diffusion magnet 120 in Example 1 is replaced by Figures 8-10 The 3D diffusion magnet 120 shown; specifically:

[0224] The 3D diffusion magnet 120 used in this embodiment includes a first diffusion region 1211 in the shape of a quadrangular prism extending along the length of the 3D diffusion magnet 120 , a second diffusion region 1212 in the shape of a quadrangular prism extending along the length of the 3D diffusion magnet 120 , and a third diffusion region 1213 consisting of two third diffusion sub-regions.

[0225] It should be noted that the first diffusion region 1211 and the second diffusion region 1212 are distributed at both ends of the width direction of the 3D diffusion magnet 120; the two third diffusion sub-regions are respectively located at both ends of the length direction of the 3D diffusion magnet 120, and are shaped like quadrangular prisms and do not run through the length direction of the 3D diffusion magnet 120.

[0226] It can be understood that the content of heavy rare earth in the third diffusion region 1213 is greater than the content of heavy rare earth in the non-diffusion region.

[0227] It can be further understood that the area of ​​the third diffusion region 1213 , the maximum length along the width direction of the 3D diffusion magnet, and the maximum length along the thickness direction of the 3D diffusion magnet satisfy the constraints of equations (I) to (III).

[0228] It is understandable that the content of heavy rare earth in the third diffusion region 1213 is g i .

[0229] Example 6

[0230] This embodiment provides a rotor with 3D diffused magnets, which differs from Embodiment 5 in that:

[0231] In this embodiment, the 3D diffused magnets 120 are arranged in a V-shape, so a=1 in equations (I) to (III) and the number of 3D diffused magnets 120 used is twice that of the fifth embodiment.

[0232] Example 7

[0233] This embodiment provides a rotor with a 3D diffused magnet. The structural diagram of the adopted 3D diffused magnet is shown in FIG. Figures 11-13 As shown, the specific composition and size limitations of the provided rotor differ from those of Example 1 in that:

[0234] The 3D diffusion magnet 120 in Example 1 is replaced by Figures 11-13 The 3D diffusion magnet 120 shown; specifically:

[0235] In the 3D diffusion magnet used in this embodiment:

[0236] The first diffusion region 1211 is composed of two first diffusion sub-regions. Each of the first diffusion sub-regions is in the shape of a quadrangular prism and does not extend through the length of the 3D diffusion magnet 120. In other words, among multiple cross-sections formed perpendicular to the axis of the core 110, some of the cross-sections do not show the first diffusion region 1211.

[0237] The two first diffusion sub-regions are distributed at both ends of the length direction of the 3D diffusion magnet 120;

[0238] The second diffusion region 1212 is similar to the first diffusion region 1211 and consists of two second diffusion sub-regions. It does not run through the length direction of the 3D diffusion magnet 120 but is distributed at both ends of the length direction of the 3D diffusion magnet 120 .

[0239] When the first diffusion region 1211 and the second diffusion region 1212 are shown on a cross section formed perpendicular to the axial direction of the core 110, S1 and S2 of the first diffusion region 1211 and the second diffusion region 1212 shown on the cross section satisfy the constraint of formula (I); 1max and L 2maxSatisfying the constraints of formula (II), W 1max and W 2max Satisfy the constraints of formula (III).

[0240] Example 8

[0241] This embodiment provides a rotor with 3D diffused magnets, which differs from Embodiment 7 in that:

[0242] In this embodiment, the 3D diffused magnets 120 are arranged in a V-shape, so a=1 in equations (I) to (III) and the number of 3D diffused magnets 120 used is twice that of embodiment 7.

[0243] Example 9

[0244] This embodiment provides a rotor with a 3D diffused magnet. The structural diagram of the adopted 3D diffused magnet is shown in FIG. Figure 14 As shown, the specific composition and size limitations of the provided rotor differ from those of Example 1 in that:

[0245] The 3D diffusion magnet 120 in Example 1 is replaced by Figure 14 The 3D diffusion magnet 120 shown; specifically:

[0246] In the 3D diffusion magnet used in this embodiment:

[0247] The first diffusion region 1211 and the second diffusion region 1212 are both in the shape of quadrangular prisms, both pass through the length direction of the 3D diffusion magnet 120 , and are distributed at both ends of the width direction of the 3D diffusion magnet 120 ;

[0248] In the width direction of the 3D diffusion magnet 120 , a third diffusion region 1213 is further provided;

[0249] The third diffusion region 1213 does not contact the first diffusion region 1211 or the second diffusion region 1212 , and is in a quadrangular shape, running through the length direction of the 3D diffusion magnet 120 .

[0250] The area of ​​the third diffusion region in any cross section, the maximum length along the width direction of the 3D diffusion magnet, and the maximum length along the thickness direction of the 3D diffusion magnet satisfy the constraints of equations (I) to (III).

[0251] It is understandable that the content of heavy rare earth in the third diffusion region 1213 is g i .

[0252] Example 10

[0253] This embodiment provides a rotor with 3D diffused magnets, which differs from the embodiment 9 in that:

[0254] In this embodiment, the 3D diffused magnets 120 are arranged in a V-shape, so a=1 in equations (I) to (III) and the number of 3D diffused magnets 120 used is twice that of the ninth embodiment.

[0255] Example 11

[0256] This embodiment provides a rotor with a 3D diffused magnet. The structural diagram of the adopted 3D diffused magnet is shown in FIG. Figure 15 As shown, the specific composition and size limitations of the provided rotor differ from those of Example 1 in that:

[0257] The 3D diffusion magnet 120 in Example 1 is replaced by Figure 15 The 3D diffusion magnet 120 shown; specifically:

[0258] The 3D diffusion magnet used in this embodiment does not include the first diffusion region 1211 , but only includes a second diffusion region 1212 in the shape of a quadrangular prism that runs through the length direction of the 3D diffusion magnet 120 . The second diffusion region 1212 is located at one end of the 3D diffusion magnet 120 in the width direction.

[0259] The area of ​​the second diffusion region 120 in any cross section, the maximum length along the width direction of the 3D diffusion magnet, and the maximum length along the thickness direction of the 3D diffusion magnet satisfy the constraints of equations (I) to (III).

[0260] Example 12

[0261] This embodiment provides a rotor with 3D diffused magnets, which differs from Embodiment 11 in that:

[0262] In this embodiment, the 3D diffuse magnets 120 are arranged in a V-shape, so a=1 in equations (I) to (III) and the number of 3D diffuse magnets 120 used is twice that of embodiment 11.

[0263] Example 13

[0264] This embodiment provides a rotor with a 3D diffused magnet. The structural diagram of the adopted 3D diffused magnet is shown in FIG. Figure 16 As shown, the specific composition and size limitations of the provided rotor differ from those of Example 1 in that:

[0265] The 3D diffusion magnet 120 in Example 1 is replaced by Figure 16 The 3D diffusion magnet 120 shown; specifically:

[0266] In the 3D diffusion magnet 120 used in this embodiment, the first diffusion region 1211 and the second diffusion region 1212 are identically shaped quadrangular prisms extending along the length of the 3D diffusion magnet 120. The area, length, and width of each diffusion region satisfy the constraints of equations (I) to (III).

[0267] In this embodiment, the parameters of the rotor are shown in Table 1. The calculated k i =0.367, k ii =0.231, k iii =0.289, which is within the range required by the present invention.

[0268] Example 14

[0269] This embodiment provides a rotor with 3D diffused magnets, which differs from Embodiment 13 in that:

[0270] In this embodiment, the 3D diffuse magnets 120 are arranged in a V-shape, so a=1 in equations (I) to (III) and the number of 3D diffuse magnets 120 used is twice that of embodiment 13.

[0271] In this embodiment, the parameters of the rotor are the same as those in embodiment 13, and the calculated k i 、k ii and k iii All meet the requirements of the present invention.

[0272] Example 15

[0273] This embodiment provides a rotor with a 3D diffused magnet, which differs from Embodiment 14 in that:

[0274] The specific parameters are different, as shown in Table 1. The calculated k i 、k ii and k iii All meet the requirements of the present invention.

[0275] Example 16

[0276] This embodiment provides a motor, the specific structure of which is as follows Figure 17 As shown, specifically:

[0277] The motor of this embodiment is composed of the rotor of embodiment 1 and a stator 200 that wraps the rotor.

[0278] Embodiments 17 to 30 respectively provide a motor, and the specific difference from embodiment 16 is that the rotors in embodiments 17 to 30 are respectively from embodiments 2 to 15.

[0279] Comparative Example 1

[0280] This comparative example provides a rotor with a 3D diffused magnet, which differs from Example 2 in that:

[0281] The permanent magnet used in this comparative example does not include a diffusion region.

[0282] This comparative example also provides a motor including the above-mentioned rotor, and specifically the above-mentioned motor also includes a stator wrapping the above-mentioned rotor.

[0283] The parameters involved in this comparative example are shown in Table 1.

[0284] Table 1 Related parameters of the rotors in Examples 13 to 15 and Comparative Example 1

[0285]

[0286]

[0287] In Table 1, the relevant parameters of Example 13 and Example 14 are exactly the same and are therefore not shown. Furthermore, when the intrinsic coercivity and the diffusion region size are determined, the heavy rare earth content in the diffusion region and the non-diffusion region is readily available industrially.

[0288] Test example

[0289] This test example tests the anti-demagnetization performance of the rotors obtained in Examples 13 to 15 and Comparative Example 1. The specific test method includes the following steps:

[0290] Place the rotor at room temperature and measure the initial magnetic flux of the rotor After testing the initial magnetic flux, place the rotor in a constant temperature box for more than 4 hours, and set the temperature of the constant temperature box to the specified temperature;

[0291] The stator is fixed by a device, the DC motor for testing is connected to a DC power supply, and the demagnetization current is set according to a preset demagnetization current value.

[0292] After preparation, remove the rotor from the constant temperature box, install the demagnetization test tooling, and pass a constant DC current through any two-phase windings of the stator. At this time, the two-phase windings of the stator generate a constant magnetic field. Rotate the rotor one circle through the device so that all 6 magnets are demagnetized by the reverse magnetic field (the magnetic field of the energized winding) (this step should be completed within 30 seconds).

[0293] After completion, place the rotor at room temperature for more than 4 hours, and then measure the rotor temperature and magnetic flux after demagnetization After the experiment, the rotor was cooled and the magnetic flux was recorded.

[0294] The test conditions and test results of the anti-demagnetization performance are summarized in Table 2.

[0295] Table 2 Anti-demagnetization performance of the rotors in Examples 13 to 15 and Comparative Example 1

[0296] Example 13 Example 14 Example 15 Comparative Example 1 130℃ / 43A 1.2％ 1.23％ 2.35％ 2.5％ 130℃ / 50A 4.3％ 4.15％ 6.86％ 6.7％

[0297] According to the results in Table 2, the rotor provided by the present invention has reasonable structural design, i.e., constraining w, h, D1, D2, β, L 1max , L 2max 、W 1max 、W 2max , the mathematical relationship between S1 and S2, and k i 、k ii and k iii The value range of can achieve a significant improvement in the anti-demagnetization performance of the resulting motor by forming a small-area diffusion zone (increasing the heavy rare earth content in the diffusion zone) (Examples 13 to 14), while limiting the cost increase as much as possible.

[0298] By reducing the heavy rare earth content in the non-diffused zone to create a diffused zone (Example 15), the resulting rotor's demagnetization resistance is comparable to that of a rotor without adjusting the heavy rare earth content distribution (Comparative Example 1). This effectively reduces rotor production costs while maintaining the rotor's demagnetization resistance. Based on the parameters of Example 15, the reduced heavy rare earth content is expected to reduce the price of the permanent magnets by 6.5-12.5%.

[0299] Furthermore, a comparison of Examples 13 and 14 shows that the technical solution provided by the present invention can be used in rotors with both inline and V-shaped 3D diffused magnet arrangements. Furthermore, the change in the 3D diffused magnet arrangement has little effect on the rotor's anti-demagnetization performance. This demonstrates the high universality of the technical solution provided by the present invention.

[0300] In Examples 1-12, the heavy rare earth content in the diffusion zone was higher than that in the non-diffused zone, and the heavy rare earth content in the non-diffused zone was comparable to that of the permanent magnet used in Comparative Example 1. The anti-demagnetization performance of the rotors obtained in Examples 1-12 was higher than that of Comparative Example 1, indicating that as long as the parameters meet the requirements of Formulas (I)-(III) of the present invention, changing the morphology of the diffusion zone in the 3D diffused magnet can significantly improve the anti-demagnetization performance of the resulting rotor.

[0301] Furthermore, since the rotor provided by the present invention has high anti-demagnetization performance and low cost, the motor, compressor and temperature control equipment including the above-mentioned motor rotor all have the above-mentioned advantages, and further have broad application prospects in industrial and civilian fields.

[0302] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A rotor with 3D diffused magnets, characterized in that: The rotor has a pole arc coefficient of β; and the rotor has: an iron core, wherein the iron core is provided with a magnet slot; a 3D diffused magnet, the 3D diffused magnet being disposed in the magnet slot; The 3D diffused magnet has a width of w mm, a thickness of h mm, and a closest distance from the axis of the rotor of D2 mm; The 3D diffusion magnet consists of a non-diffusion zone and several diffusion zones, wherein the heavy rare earth content in the diffusion zone is greater than that in the non-diffusion zone; a cross section is formed perpendicular to the axis of the iron core, and on the cross section, the area of ​​any diffusion zone is S mm 2 ; A magnetic isolation bridge, the magnetic isolation bridge being provided on a side of the magnet slot away from the axis of the iron core, the maximum distance between the magnetic isolation bridge and the axis of the rotor being D1 mm; and: （I）； Where a is 0 or 1, 0.03≤k i ≤9.

1.

2. The rotor according to claim 1, characterized in that In the cross section, the 3D diffused magnets are arranged in a V-shape, and a=1.

3. The rotor according to claim 1, characterized in that In the cross section, the 3D diffused magnets are arranged in a straight line, and a=0.

4. The rotor according to claim 1, characterized in that The heavy rare earth includes at least one of Dy and Tb.

5. The rotor according to claim 1, characterized in that The difference in intrinsic coercivity between the diffusion region and the non-diffusion region is 90-150 KA / m.

6. The rotor according to claim 1, characterized in that On the cross section, the maximum length of any diffusion region along the width direction of the 3D diffusion magnet is L max mm; and, (II); Where, 0.018≤k ii ≤5.

74.

7. The rotor according to claim 1, characterized in that On the cross section, the maximum length of the diffusion region along the thickness direction of the 3D diffusion magnet is W max mm; and, (III); Where, 0.02≤k iii ≤3.

0.

8. The rotor according to any one of claims 1 to 7, characterized in that: On the cross section, the number of the diffusion regions is 1 to 5.

9. The rotor according to claim 8, characterized in that In the cross section, the diffusion region includes a first diffusion region and a second diffusion region.

10. The rotor according to claim 9, characterized in that The first diffusion region and the second diffusion region are distributed at both ends of the 3D diffusion magnet in a width direction.

11. The rotor according to any one of claims 1 to 7, characterized in that: The maximum length of the diffusion region along the length direction of the 3D diffusion magnet is 25% to 100% of the length of the 3D diffusion magnet.

12. A motor, characterized in that: The motor comprises a rotor as claimed in any one of claims 1 to 11.

13. A compressor, characterized in that: The motor comprises the motor according to claim 12.

14. A temperature regulating device, characterized in that: The temperature regulating device comprises the motor according to claim 12 or the compressor according to claim 13 .

15. The temperature regulating device according to claim 14, characterized in that The temperature regulating device includes at least one of a refrigerator and an air conditioner.

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