Rotor structure, motor and compressor

Abstract

The present application relates to the technical field of compressors. Disclosed is a rotor structure, comprising a rotor core; a plurality of permanent magnets, which are arranged on the rotor core in the circumferential direction; and first magnetic isolation holes, each of which is arranged opposite to a permanent magnet, is disposed on the side of the permanent magnet close to the outer edge of the rotor core, and is parallel to the permanent magnet. Further disclosed in the present application are a motor and a compressor.

Description

Rotor structure, motor and compressor

[0001] This application is based on the Chinese patent application with application number 202420653803.6 and application date April 1, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0002] The present application relates to the technical field of compressors, for example, to a rotor structure, a motor and a compressor. Background Art

[0003] Motors with built-in V-shaped rare earth permanent magnets have seen significant development in recent years due to their advantages of high power density, compact size, and high efficiency. However, compared to surface-mount rare earth permanent magnet motors, they suffer from greater torque ripple.

[0004] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0005] The magnetic isolation hole group in the related art has the effect of optimizing the magnetic field distribution and can reduce the motor torque pulsation to a certain extent. However, it will also lead to a decrease in the average torque of the motor, thereby affecting the output performance of the motor. Summary of the Invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] Embodiments of the present disclosure provide a rotor structure, a motor, and a compressor, which can reduce the decrease in the torque mean value while reducing the motor torque pulsation.

[0008] According to a first aspect of an embodiment of the present disclosure, a rotor structure is provided, comprising: a rotor core; a plurality of permanent magnets circumferentially arranged on the rotor core; a first magnetic isolation hole arranged opposite to the permanent magnet, located on a side of the permanent magnet close to the outer edge of the rotor core and parallel to the permanent magnet.

[0009] According to a second aspect of the embodiments of the present disclosure, a motor is provided, comprising a stator structure and a rotor structure as described in any one of the above embodiments.

[0010] According to a third aspect of an embodiment of the present disclosure, a compressor is provided, comprising the motor as described in the above embodiment.

[0011] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0013] FIG1 is a schematic structural diagram of a rotor structure provided by an embodiment of the present disclosure;

[0014] FIG2 is an enlarged schematic diagram of a rotor structure provided by an embodiment of the present disclosure;

[0015] FIG3 is a schematic diagram of the magnetic field line distribution within a single pole range of a rotor structure provided by an embodiment of the present disclosure;

[0016] FIG4 is a schematic diagram of an equivalent magnetic circuit of a rotor structure within a single pole range provided by an embodiment of the present disclosure;

[0017] FIG5 is a schematic diagram of an equivalent magnetic circuit of another rotor structure within a single pole range provided by an embodiment of the present disclosure;

[0018] FIG6 is a schematic diagram comparing the relationship between the rotor position electrical angle and the electromagnetic torque of a motor in the prior art and a motor provided by an embodiment of the present disclosure;

[0019] FIG7 is a schematic structural diagram of a motor provided by an embodiment of the present disclosure;

[0020] FIG8 is a schematic structural diagram of a compressor provided in an embodiment of the present disclosure.

[0021] Reference numerals:

[0022] 1: rotor core;

[0023] 2: permanent magnet; 21: first section; 22: second section;

[0024] 3: The first magnetic isolation hole;

[0025] 4: The second magnetic isolation hole;

[0026] 5: Motor; 51: Rotor structure; 52: Stator structure

[0027] 6: Compressor. DETAILED DESCRIPTION

[0028] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0029] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0030] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0031] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0032] Unless otherwise stated, the term "plurality" means two or more.

[0033] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0035] 1 to 5 , an embodiment of the present disclosure provides a rotor structure 51 , including a rotor core 1 , permanent magnets 2 and first magnetic isolation holes 3 .

[0036] There are multiple permanent magnets 2 circumferentially arranged on the rotor core 1 ; the first magnetic isolation holes 3 are arranged opposite to the permanent magnets 2 , and are arranged on one side of the permanent magnets 2 close to the outer edge of the rotor core 1 and parallel to the permanent magnets 2 .

[0037] Using the rotor structure 51 provided in the embodiment of the present disclosure, a first magnetic isolation hole 3 is provided between the permanent magnet 2 and the outer edge of the rotor core 1, effectively covering the range of the magnetic pole where magnetic field deformation is most likely to occur, thereby optimizing the magnetic field distribution and reducing the harmonic content in the back electromotive force, thereby effectively suppressing the fluctuation of the electromagnetic torque of the motor. The first magnetic isolation hole 3 is parallel to the permanent magnet 2 and relatively close to the center of the magnetic pole, which can increase the difference between the magnetic permeability of the direct-axis magnetic circuit and the magnetic permeability of the quadrature-axis magnetic circuit, and can provide a portion of the reluctance torque during operation. The reluctance torque can form a certain compensatory effect for the reduction in the torque mean value brought about by the optimization of the magnetic field distribution, thereby reducing the impact on the total electromagnetic torque of the motor and ensuring the output performance of the motor.

[0038] In addition, compared with the related art, the rotor structure 51 provided by the embodiment of the present disclosure is provided with fewer first magnetic isolation holes 3 , which has less impact on the overall strength and rigidity of the rotor core 1 .

[0039] Optionally, there is an offset angle θ between the first magnetic isolation hole 3 and the permanent magnet 2 . The permanent magnet 2 includes a first section 21 and a second section 22 . The angle between the first section 21 and the second section 22 is α, 0≤θ≤k×|α-90°|, where 0<k<1.

[0040] The deviation angle θ is the angle of deviation from the parallel direction based on the parallelism between the first magnetic isolation hole 3 and the permanent magnet 2. The deviation angle is given a value range in order to limit the maximum value of the deviation angle between the actual implementation angle between the first magnetic isolation hole 3 and the permanent magnet 2 and the parallel direction, where k is the deviation coefficient. When k exceeds the maximum coefficient 1, the deviation angle exceeds α-90°. At this time, the first magnetic isolation hole 3 can no longer be considered to be parallel to the direction of the permanent magnet 2 as a reference benchmark, but is similar to the common implementation method in the related art. The equivalent length of the magnetic isolation hole in the related art is the projected length of the magnetic isolation hole in the direction of the permanent magnet 2. The projected length is smaller than the actual size of the magnetic isolation hole. Therefore, the size of the magnetic isolation hole in the related art will be larger than the size of the first magnetic isolation hole 3 in the present application, or the number will be more than the number of the first magnetic isolation holes 3 in the present application.

[0041] Among them, the angle α between the first section 21 and the second section 22 of the permanent magnet 2 is less than 180°, and the first section 21 and the second section 22 form a V-shaped or V-like permanent magnet 2. Each permanent magnet 2 composed of the first section 21 and the second section 22 serves as a pole in the rotor structure 51. The range of the rotor structure 51 corresponding to this pole is a monopole range. Figure 2 is a schematic diagram of the distribution of the permanent magnet 2 and the first magnetic isolation hole 3 in the rotor structure 51 within the monopole range. When the angle α between the first section 21 and the second section 22 is less than 90°, α-90° is less than zero, and the deviation angle is removed from the absolute value. When α is less than 90°, the first section 21 and the second section 22 are distributed at an acute angle, and the distance between the first section 21 and the second section 22 is closer, which can enhance the working efficiency of the rotor structure 51 to a certain extent. However, since the first section 21 and the second section 22 are distributed at an acute angle, the number of permanent magnets 2 required for the entire rotor structure 51 increases a lot, which will increase the cost to a certain extent. Therefore, the angle between the first section 21 and the second section 22 of the permanent magnet 2 is generally between 90° and 180°.

[0042] Optionally, as shown in Figures 1 and 2, the first section 21 and the second section 22 are symmetrically arranged, and the rotor structure 51 also includes a second magnetic isolation hole 4, which is arranged on the side of the permanent magnet 2 close to the outer edge of the rotor core 1, and is arranged on the symmetry axis of the first section 21 and the second section 22, and extends along the direction of the symmetry axis.

[0043] As shown in Figure 3, within the single-pole range, the magnetic field distribution density on the symmetry axis of the first section 21 and the second section 22 is relatively large. The second magnetic isolation hole 4 is provided on the symmetry axis, which can regulate the magnetic field of the central symmetry axis part to a certain extent, so that the magnetic field distribution under the magnetic pole is more inclined to a smoothly changing sinusoidal waveform, and further can suppress the fluctuation of the motor torque to a certain extent.

[0044] It is understood that the first magnetic isolation hole 3 and the second magnetic isolation hole 4 can be in the form of an oblong hole or a rectangular hole. This application uses the example of the first magnetic isolation hole 3 and the second magnetic isolation hole 4 being both oblong holes. When the first magnetic isolation hole 3 and the second magnetic isolation hole 4 are oblong holes, the stress concentration caused by the rectangular holes can be avoided, and the overall strength of the rotor structure 51 can be prevented from being affected.

[0045] Optionally, as shown in FIG2 , the distance between the first magnetic isolation hole 3 and the opposite permanent magnet 2 is s1 , the thickness of the permanent magnet 2 is h1 , and 0.7≤s1 / h1≤1.35.

[0046] The embodiment of the present disclosure can limit the distance between the first magnetic isolation hole 3 and the corresponding permanent magnet 2. Taking the thickness h1 (magnetization direction length) of the permanent magnet 2 as 2 mm as an example, when the distance between the first magnetic isolation hole 3 and the permanent magnet 2 is between 1.4 mm and 2.7 mm, that is, 0.7×2 mm to 1.35×2 mm, it can not only ensure the strength of the rotor core 1, but also provide sufficient passage space for the magnetic lines of force, and adjust the magnetic field in the area where the magnetic lines of force are densely distributed, so that the magnetic field distribution in this area tends to change more smoothly.

[0047] It can be understood that the distance between the first magnetic isolation hole 3 and the opposite permanent magnet 2 can be 1.4 mm, 1.7 mm, 2.1 mm, 2.4 mm and 2.7 mm.

[0048] Optionally, as shown in FIG2 , the thickness of the first magnetic isolation hole 3 is h2, and 0.35≤h2 / h1≤0.8.

[0049] Limiting the thickness of the first magnetic isolation hole 3 can limit the degree of adjustment it can provide to the area requiring magnetic field regulation. The first magnetic isolation hole 3 is arranged parallel to the corresponding permanent magnet 2, directly applying resistance to the magnetic lines of force along the thickness direction of the first magnetic isolation hole 3. This optimizes the magnetic field by redirecting the magnetic lines of force to a certain extent. Taking a 2mm thickness h1 of the permanent magnet 2 as an example, when the thickness of the first magnetic isolation hole 3 is within the range of 0.7mm to 1.6mm (i.e., 0.35×2mm to 0.8×2mm), it can achieve a good magnetic field regulation effect while avoiding weakening the magnetic flux density, reducing the decline in the motor's mean torque, and ensuring the output performance of the electrode.

[0050] It can be understood that the thickness of the first magnetic isolation hole 3 can be 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm and 1.6 mm.

[0051] Optionally, as shown in FIG2 , the distance between the ends of two adjacent first magnetic isolation holes 3 away from the outer edge of the rotor core 1 is s2, s2 / h1≤1.2, s2≥0.

[0052] The embodiment of the present disclosure limits the maximum value of the distance between the two first magnetic isolation holes 3. Taking the thickness h1 of the permanent magnet 2 as 2 mm as an example, when s2≤1.2×2 mm, the optimized area of ​​the first magnetic isolation hole 3 is a reasonable area that needs to be optimized, thereby improving the optimization effect.

[0053] It can be understood that the distance between the ends of two adjacent first magnetic isolation holes 3 away from the outer edge of the rotor core 1 can be 2.4 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm or 0.

[0054] When s2 = 0, two adjacent first magnetic isolation holes 3 are connected at their ends away from the outer edge of the rotor core 1, forming a V-shaped or V-like first magnetic isolation hole 3. In this case, the two connected first magnetic isolation holes 3 are symmetrically distributed, and the symmetry axis coincides with the symmetry axis of the second magnetic isolation hole 4.

[0055] The second magnetic isolation hole 4 is arranged on the symmetric axis of the V-shaped first magnetic isolation hole 3, and is arranged in the space between the first magnetic isolation hole 3 and the rotor core 1, or the second magnetic isolation hole 4 passes through the first magnetic isolation hole 3, a part of the second magnetic isolation hole 4 is located in the space between the first magnetic isolation hole 3 and the rotor core 1, and the other part is located on the other side of the first magnetic isolation hole 3, forming a trident-shaped or trident-like magnetic isolation hole.

[0056] Optionally, the rotor structure 51 also includes a connecting channel (not shown), which is arranged between the ends of two adjacent first magnetic isolation holes 3 away from the outer edge of the rotor core 1, and is respectively connected to the two adjacent first magnetic isolation holes 3 to form a flat-bottomed V-shaped or similar flat-bottomed V-shaped first magnetic isolation hole 3, and the second magnetic isolation hole 4 is arranged on the symmetry axis of the flat-bottomed V-shaped first magnetic isolation hole 3, and is arranged in the space between the first magnetic isolation hole 3 and the rotor core 1, or the second magnetic isolation hole 4 passes through the connecting channel, and a part of the second magnetic isolation hole 4 is located in the space between the first magnetic isolation hole 3 and the rotor core 1, and the other part is located on the other side of the first magnetic isolation hole 3, forming a flat-bottomed trident-shaped or similar flat-bottomed trident-shaped magnetic isolation hole group.

[0057] Optionally, as shown in FIG2 , the distance between the second magnetic isolation hole 4 and the outer edge of the rotor core 1 is s3, and 0.4≤s3≤h1.

[0058] Taking the thickness h1 of the permanent magnet 2 as 2 mm as an example, when the distance s3 between the second magnetic isolation hole 4 and the outer edge of the rotor core 1 is in the range of 0.4 mm to 2 mm, it can not only ensure the mechanical strength of the rotor structure 51, but also achieve the effect of the second magnetic isolation hole 4 significantly suppressing torque pulsation.

[0059] It can be understood that the distance between the second magnetic isolation hole 4 and the outer edge of the rotor core 1 can be 0.4 mm, 0.8 mm, 1.2 mm, 1.6 mm and 2 mm.

[0060] Optionally, as shown in FIG2 , the width of the first magnetic isolation hole 3 is x, the width of the permanent magnet 2 is y, and 0.2≤x / y≤0.35.

[0061] Limiting the width of the first magnetic isolation hole 3 can limit the range of the adjustment area of ​​the first magnetic isolation hole 3 for the permanent magnet 2. The first magnetic isolation hole 3 needs to be located in the area near the permanent magnet 2 where the magnetic field density is significantly higher than in other parts. When the ratio of the width of the first magnetic isolation hole 3 to the width of the permanent magnet 2 is within the range of 0.2 to 0.35, the first magnetic isolation hole 3 can adjust the corresponding area with higher magnetic field density, achieve the effect of suppressing torque pulsation, and ensure the output performance of the motor.

[0062] It can be understood that the ratio of the width of the first magnetic isolation hole 3 to the width of the permanent magnet 2 can be 0.2, 0.25, 0.3 and 0.35.

[0063] Optionally, as shown in FIG2 , the thickness of the second magnetic isolation hole 4 is h3, and 0.6≤h3 / h1≤1.

[0064] Second magnetic isolation holes 4 are positioned on the axis of symmetry between first segment 21 and second segment 22 of permanent magnet 2, parallel to the direction of the magnetic lines of force, and can assist in guiding the direction of the magnetic lines of force. For example, if the thickness h1 of permanent magnet 2 is 2 mm, when the thickness of second magnetic isolation holes 4 is within the range of 1.2 mm to 2 mm, this can both guide the direction of the magnetic lines of force and minimize the decrease in the mean motor torque, thereby ensuring the motor's output performance.

[0065] It can be understood that the thickness of the second magnetic isolation hole 4 can be 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm and 2 mm.

[0066] Optionally, as shown in FIG2 , the width of the second magnetic isolation hole 4 is x1, and 0.3≤x1 / y≤0.6.

[0067] When the ratio of the width of the second magnetic isolation hole 4 to the width of the permanent magnet 2 is in the range of 0.3 to 0.6, it can not only guide the direction of the magnetic lines of force, but also reduce the decrease in the average value of the motor torque, thereby ensuring the output performance of the motor.

[0068] It can be understood that the ratio of the width of the second magnetic isolation hole 4 to the width of the permanent magnet 2 can be 0.3, 0.4, 0.5 or 0.6.

[0069] Optionally, FIG3 is a schematic diagram of the magnetic field line distribution within the monopole range of the rotor structure 51. The first magnetic isolation hole 3 is arranged parallel to the permanent magnet 2. The purpose is to adjust and optimize the part where the magnetic field increases sharply relatively uniformly. The magnetic field lines tend to connect along a path with smaller magnetic resistance. Therefore, near the first magnetic isolation hole 3 set in the present application, the magnetic field lines tend to avoid the first magnetic isolation hole 3 and bypass the adjacent area, which to a certain extent smoothes the drastic changes in the magnetic field distribution in this part. At the same time, the second magnetic isolation hole 4 can avoid the excessive increase in the magnetic field density at the center, making the overall magnetic field distribution area continuous and smooth, thereby suppressing the motor torque fluctuation.

[0070] Alternatively, Figures 4 and 5 are equivalent magnetic circuit diagrams within the unipolar range of the rotor structure 51, where Hc is the coercive force of the permanent magnet 2, h1 is the length of the permanent magnet 2 in the magnetization direction (the thickness of the permanent magnet 2), and R1 is the equivalent magnetic resistance of the first magnetic isolation hole 3. Since the second magnetic isolation hole 4 hardly blocks the magnetic flux in the thickness direction, it has no significant effect on the equivalent magnetic resistance of the magnetic circuit and can be ignored. Rm is the equivalent magnetic resistance of the permanent magnet 2, and Rg is the equivalent magnetic resistance of the air gap in the half-pole range. is the air gap flux in the half-pole range, is the magnetic flux of the first segment 21 of the permanent magnet 2. The magnetic circuit corresponding to the second segment 22 of the permanent magnet 2 and the magnetic circuit corresponding to the first segment 21 together form a complete closed magnetic circuit, which does not affect the equivalence of each part when analyzing the relationship.

[0071] The direction perpendicular to the permanent magnet 2 is taken as the direct axis direction, and the direction of the boundary line between each pole is taken as the quadrature axis direction. There is a negative correlation between inductance and magnetic resistance. Compared with the conventional solution, the present application increases the equivalent magnetic resistance brought by the provision of the first magnetic isolation hole 3. Therefore, the direct axis equivalent inductance is reduced, and the quadrature axis magnetic circuit has almost no effect. The magnetic resistance torque is the difference between the quadrature axis equivalent inductance and the direct axis equivalent inductance. Therefore, the quadrature and direct axis inductance difference corresponding to the embodiment of the present disclosure is expanded to a certain extent, which is conducive to exerting the magnetic resistance torque.

[0072] Figure 6 shows a comparison of the simulated waveforms of the electromagnetic torque of the motor under the same rated current conditions when the motor adopts the conventional solution and the solution of the present application. The simulation range is two electrical cycles (i.e., an electrical angle of 720 degrees). The average electromagnetic torque of the motor using the conventional solution is 8.41 Nm, and the torque pulsation rate is 19.85%. The average electromagnetic torque of the motor using the solution of the present application is 8.29 Nm, and the torque pulsation rate is 12.83%. By comparison, it can be seen that the electromagnetic torque pulsation rate of the motor is significantly reduced by the solution of the present application. At the same time, the average electromagnetic torque of the motor decreases by only 0.12 Nm, accounting for 1.4% of the original average electromagnetic torque. Among them, torque pulsation rate = (maximum torque - minimum torque) ÷ average torque.

[0073] 7 , an embodiment of the present disclosure provides a motor 5 , comprising a stator structure 52 and a rotor structure 51 as described in any one of the above embodiments.

[0074] The motor 5 provided in the second embodiment of the present application includes the rotor structure 51 described in any one of the embodiments of the first aspect, and thus has all the beneficial effects of the rotor structure 51 described in any one of the embodiments of the first aspect, which will not be repeated here.

[0075] As shown in FIG8 , an embodiment of the present disclosure provides a compressor 6 , comprising the motor 5 as described in the above embodiment.

[0076] The compressor provided by the embodiment of the third aspect of the present application includes the motor 5 described in any one of the embodiments of the second aspect, and thus has all the beneficial effects of the motor 5 described in any one of the embodiments of the first aspect, which will not be repeated here.

[0077] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can be found in the description of the method part.

Claims

1. A rotor structure comprising: rotor core; A plurality of permanent magnets are circumferentially arranged on the rotor core; The first magnetic isolation hole is arranged opposite to the permanent magnet, is arranged on a side of the permanent magnet close to the outer edge of the rotor core and is parallel to the permanent magnet.

2. The rotor structure according to claim 1, wherein: There is a deviation angle θ between the first magnetic isolation hole and the permanent magnet. The permanent magnet includes a first segment and a second segment. The included angle between the first segment and the second segment is α, 0≤θ≤k×|α-90°|, wherein 0<k<1.

3. The rotor structure according to claim 2, wherein: The first section and the second section are symmetrically arranged, and the rotor structure further comprises: The second magnetic isolation hole is arranged on a side of the permanent magnet close to the outer edge of the rotor core, is arranged on the symmetry axis of the first section and the second section, and extends along the symmetry axis.

4. The rotor structure according to any one of claims 1 to 3, wherein: The distance between the first magnetic isolation hole and the opposite permanent magnet is s1, the thickness of the permanent magnet is h1, and 0.7≤s1 / h1≤1.

35.

5. The rotor structure according to claim 4, wherein: The thickness of the first magnetic isolation hole is h2, 0.35≤h2 / h1≤0.

8.

6. The rotor structure according to claim 4 or 5, wherein: The distance between the ends of two adjacent first magnetic isolation holes away from the outer edge of the rotor core is s2, s2 / h1≤1.2, s2≥0.

7. The rotor structure according to any one of claims 4 to 6, wherein: The distance between the second magnetic isolation hole and the outer edge of the rotor core is s3, 0.4≤s3≤h1.

8. The rotor structure according to any one of claims 1 to 7, wherein: The width of the first magnetic isolation hole is x, the width of the permanent magnet is y, and 0.2≤x / y≤0.

35.

9. The rotor structure according to any one of claims 3 to 8, wherein: The first magnetic isolation hole and / or the second magnetic isolation hole are in the shape of an oblong hole.

10. The rotor structure according to any one of claims 3 to 8, wherein: The thickness of the second magnetic isolation hole is h3, 0.6≤h3 / h1≤1.

11. The rotor structure according to any one of claims 3 to 8, wherein: The width of the second magnetic isolation hole is x1, 0.3≤x1 / y≤0.

6.

12. An electric motor comprising a stator structure and a rotor structure according to any one of claims 1 to 11.

13. A compressor comprising the motor according to claim 12.

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