Rotor structure, motor and compressor

Abstract

The utility model relates to the technical field of compressors, and discloses a rotor structure, which comprises a rotor iron core; the plurality of permanent magnets are circumferentially arranged on the rotor iron core; and the first magnetic isolation hole is arranged opposite to the permanent magnet, is arranged on one side, close to the outer edge of the rotor core, of the permanent magnet and is parallel to the permanent magnet. The first magnetic isolation holes are formed between the permanent magnets and the outer edge of the rotor core, the range, where magnetic field deformation is most likely to happen, in the magnetic poles is effectively covered, magnetic field distribution is optimized, and therefore fluctuation of electromagnetic torque of the motor is effectively restrained. The first magnetic isolation holes are parallel to the permanent magnets and relatively close to the center positions of the magnetic poles, the difference between direct-axis magnetic circuit magnetic conductance and quadrature-axis magnetic circuit magnetic conductance can be increased, a part of reluctance torque can be provided in the operation process, the reluctance torque can form a certain compensation effect on reduction of a torque mean value caused by optimization of magnetic field distribution, and the stability of the magnetic field distribution is improved. Therefore, the influence on the total electromagnetic torque of the motor is small, and the output performance of the motor is ensured. The utility model further discloses a motor and a compressor.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a rotor structure, a motor and a compressor. Background Art

[0002] At present, motors with built-in V-shaped rare earth permanent magnets have the advantages of high power density, small size, and high efficiency, and have been greatly developed in recent years. However, compared with surface-mounted rare earth permanent magnet motors, their torque pulsation is larger.

[0003] The related technology discloses a rotor structure, a motor and a compressor, wherein the rotor structure includes a rotor core and a plurality of permanent magnets arranged on the rotor core to form a plurality of magnetic poles on the rotor core, the plurality of magnetic poles including a plurality of N poles and a plurality of S poles alternately arranged along the circumference of the rotor core; a magnetic isolation hole group is opened on at least one magnetic pole of the rotor core, and the magnetic isolation hole group has a first magnetic isolation hole and a second magnetic isolation hole arranged at intervals along a direction away from the axis of the rotor core; taking a plane perpendicular to the axis of the rotor core as a predetermined plane, the projection of the first magnetic isolation hole on the predetermined plane and the projection of the second magnetic isolation hole on the predetermined plane are both strip-shaped, and the projection of the first magnetic isolation hole on the predetermined plane is perpendicular to the projection of the second magnetic isolation hole on the predetermined plane.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] The magnetic isolation hole group in the related technology 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.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0007] 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 components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a rotor structure, a motor and a compressor, so as to reduce the decrease of the torque mean value while reducing the torque pulsation of the motor.

[0009] According to the first aspect of the embodiment of the utility model, a rotor structure is provided, including: 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, arranged on a side of the permanent magnet close to the outer edge of the rotor core and parallel to the permanent magnet.

[0010] Optionally, there is a deviation angle θ between the first magnetic isolation hole and the permanent magnet, the permanent magnet includes a first section and a second section, the angle between the first section and the second section is α, 0≤θ≤k×|α-90°|, wherein 0<k<1.

[0011] Optionally, the first section and the second section are symmetrically arranged, and the rotor structure also includes: a second magnetic isolation hole, arranged on a side of the permanent magnet close to the outer edge of the rotor core, arranged on the symmetry axis of the first section and the second section, and extending along the direction of the symmetry axis.

[0012] Optionally, 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.

[0013] Optionally, the thickness of the first magnetic isolation hole is h2, and 0.35≤h2 / h1≤0.8.

[0014] Optionally, 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.

[0015] Optionally, the distance between the second magnetic isolation hole and the outer edge of the rotor core is s3, and 0.4≤s3≤h1.

[0016] Optionally, 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.

[0017] According to a second aspect of the embodiments of the utility model, a motor is provided, comprising a rotor structure as described in any one of the above embodiments.

[0018] According to a third aspect of an embodiment of the utility model, a compressor is provided, comprising the motor as described in the above embodiment.

[0019] The rotor structure, motor and compressor provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] The rotor structure provided by the embodiment of the present disclosure is adopted, and a first magnetic isolation hole is set between the permanent magnet and the outer edge of the rotor core to effectively cover the range of the magnetic pole where magnetic field deformation is most likely to occur, so that the magnetic field distribution is optimized, and the harmonic content in the back electromotive force is reduced, so that the fluctuation of the electromagnetic torque of the motor is effectively suppressed. The first magnetic isolation hole is parallel to the permanent magnet and relatively close to the center position 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 cross-axis magnetic circuit, and can provide a part of the magnetic resistance torque during operation. The magnetic resistance torque can form a certain compensation effect on the reduction of the torque mean value brought about by the optimization of the magnetic field distribution, so that the total electromagnetic torque of the motor is less affected, and the output performance of the motor is guaranteed.

[0021] 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

[0022] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0023] Figure 1 is a structural schematic diagram of a rotor structure provided by an embodiment of the present disclosure;

[0024] Figure 2 is an enlarged structural schematic diagram of a rotor structure provided by an embodiment of the present disclosure;

[0025] Figure 3 is a schematic diagram of magnetic force line distribution within a single pole range of a rotor structure provided by an embodiment of the present disclosure;

[0026] Figure 4 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;

[0027] Figure 5 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;

[0028] Figure 6 It is a schematic diagram comparing the curve relationship between the rotor position electrical angle and the electromagnetic torque of the motor in the prior art and the motor provided by the embodiment of the present disclosure.

[0029] Reference numerals:

[0030] 1: rotor core;

[0031] 2: permanent magnet; 21: first section; 22: second section;

[0032] 3: The first magnetic isolation hole;

[0033] 4: The second magnetic isolation hole. DETAILED DESCRIPTION

[0034] In order to be able to understand the features and technical contents 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 attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the 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.

[0035] The terms "first", "second", etc. in the specification and claims of the disclosed embodiments and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate for the disclosed embodiments described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0036] 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 have 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.

[0037] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0038] Unless otherwise stated, the term "plurality" means two or more.

[0039] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0040] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0042] Combination Figure 1-5 As shown, an embodiment of the present disclosure provides a rotor structure, including a rotor core 1, a permanent magnet 2 and a first magnetic isolation hole 3.

[0043] There are multiple permanent magnets 2 circumferentially arranged on the rotor core 1 ; the first magnetic isolation hole 3 is arranged opposite to the permanent magnet 2 , and is arranged on one side of the permanent magnet 2 close to the outer edge of the rotor core 1 and parallel to the permanent magnet 2 .

[0044] The rotor structure provided by the embodiment of the present disclosure is adopted, and the first magnetic isolation hole 3 is set between the permanent magnet 2 and the outer edge of the rotor core 1, which effectively covers the range of the magnetic field deformation that is most likely to occur in the magnetic pole, so that the magnetic field distribution is optimized, and the harmonic content in the back electromotive force is reduced, so that the fluctuation of the electromagnetic torque of the motor is effectively suppressed. The first magnetic isolation hole 3 is parallel to the permanent magnet 2 and relatively close to the center position 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 cross-axis magnetic circuit, and can provide a part of the magnetic resistance torque during operation. The magnetic resistance torque can form a certain compensation effect on the reduction of the torque mean value brought about by the optimization of the magnetic field distribution, so that the total electromagnetic torque of the motor is less affected, and the output performance of the motor is guaranteed.

[0045] In addition, compared with the related art, the rotor structure provided by the embodiment of the present disclosure has fewer first magnetic isolation holes 3 , which have less impact on the overall strength and rigidity of the rotor core 1 .

[0046] Optionally, there is a deviation 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 included angle between the first section 21 and the second section 22 is α, 0≤θ≤k×|α-90°|, wherein 0<k<1.

[0047] The deviation angle θ is the angle of deviation from the parallel direction on the basis that the first magnetic isolation hole 3 is parallel to the permanent magnet 2. Giving the deviation angle a value range is 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 reference, 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 projection length of the magnetic isolation hole in the direction of the permanent magnet 2. The projection 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.

[0048] 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, and the range of the rotor structure corresponding to this pole is a monopole range. Figure 2 The diagram is a distribution diagram of the permanent magnet 2 and the first magnetic isolation hole 3 in the rotor structure within the single-pole 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 relatively close, which can enhance the working efficiency of the rotor structure 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 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°.

[0049] Alternatively, if Figure 1 and Figure 2 As shown, the first section 21 and the second section 22 are symmetrically arranged, and the rotor structure 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.

[0050] Combination Figure 3 As shown, 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 arranged 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.

[0051] It can be understood that the shape of the first magnetic isolation hole 3 and the second magnetic isolation hole 4 can be an oblong hole or a rectangular hole. The present application takes the shape of the first magnetic isolation hole 3 and the second magnetic isolation hole 4 as an example. 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 can be avoided from being affected.

[0052] Alternatively, if Figure 2 As shown, 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.

[0053] The disclosed embodiment 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 2mm as an example, when the distance between the first magnetic isolation hole 3 and the permanent magnet 2 is less than 0.7*2mm, the distance between the two is too small, and the strength of the rotor core 1 between the first magnetic isolation hole 3 and the permanent magnet 2 is low, which will affect the reliability of the long-term operation of the rotor structure. Moreover, when the distance between the two is too small, it is impossible to provide enough space for the passage of magnetic lines of force, which will lead to excessive saturation and torque instability. When the distance between the first magnetic isolation hole 3 and the permanent magnet 2 is greater than 1.35*2mm, the distance between the two is too large, and the first magnetic isolation hole 3 cannot accurately optimize the area where the magnetic field needs to be adjusted, resulting in a weakened adjustment optimization effect. When the distance between the first magnetic isolation hole 3 and the permanent magnet 2 is between 1.4mm-2.7mm, 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.

[0054] 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.

[0055] Alternatively, if Figure 2 As shown, the thickness of the first magnetic isolation hole 3 is h2, and 0.35≤h2 / h1≤0.8.

[0056] Limiting the thickness of the first magnetic isolation hole 3 can limit the adjustment degree of the first magnetic isolation hole 3 for the area where the magnetic field needs to be adjusted. The first magnetic isolation hole 3 is arranged in parallel with the corresponding permanent magnet 2, and directly applies resistance to the magnetic lines of force in the thickness direction of the first magnetic isolation hole 3, and guides the magnetic lines of force to detour to a certain extent to achieve the purpose of optimizing the magnetic field. Taking the thickness h1 of the permanent magnet 2 as 2mm as an example, when the thickness of the first magnetic isolation hole 3 is too small, that is, less than 0.35*2mm, the adjustment degree is too low and no obvious effect can be achieved. When the thickness of the first magnetic isolation hole 3 is too large, that is, greater than 0.8*2mm, the adjustment degree is too heavy, which will bring new unstable factors due to excessive adjustment, and on the other hand, the mean value of the motor output torque will drop significantly due to the obvious weakening of the magnetic flux density, affecting the output performance of the motor. When the thickness of the first magnetic isolation hole 3 is within the range of 0.7mm-1.6mm, it can not only achieve a better effect of adjusting the magnetic field, but also avoid weakening the magnetic flux density, reduce the decline in the mean value of the motor torque, and ensure the output performance of the electrode.

[0057] 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.

[0058] Alternatively, if Figure 2 As shown, 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.

[0059] The disclosed embodiment 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 the distance between two adjacent first magnetic isolation holes 3 is too large, that is, s2 is greater than 1.2*2 mm, for a single first magnetic isolation hole 3, the coverage area position of the corresponding permanent magnet 2 will be significantly offset, biased towards the end of the magnetic pole close to the outer edge of the rotor core 1, which will cause the optimized area of ​​the first magnetic isolation hole 3 to not be a reasonable area that needs to be optimized, resulting in a weakened optimization effect.

[0060] 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.

[0061] When s2=0, the ends of two adjacent first magnetic isolation holes 3 away from the outer edge of the rotor core 1 are connected to form a V-shaped or V-like first magnetic isolation hole 3.

[0062] The first magnetic isolation holes 3 are symmetrically distributed, and the symmetry axis thereof coincides with the symmetry axis where the second magnetic isolation holes 4 are located.

[0063] The second magnetic isolation hole 4 is arranged on the symmetry 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.

[0064] Optionally, the rotor structure 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, 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.

[0065] Alternatively, if Figure 2 As shown, 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.

[0066] When the distance between the second magnetic isolation hole 4 and the outer edge of the rotor core 1 is less than 0.4mm, the mechanical strength of the rotor structure will be significantly weakened, affecting its reliability. Taking the thickness h1 of the permanent magnet 2 as 2mm as an example, when the distance between the second magnetic isolation hole 4 and the outer edge of the rotor core 1 is greater than 2mm, it will deviate from the densely distributed area of ​​magnetic lines of force, so that the effect of the second magnetic isolation hole 4 on suppressing torque pulsation is weakened. When the distance s3 between the second magnetic isolation hole 4 and the outer edge of the rotor core 1 is within the range of 0.4mm-2mm, it can not only ensure the mechanical strength of the rotor structure, but also achieve the effect of the second magnetic isolation hole 4 on suppressing torque pulsation.

[0067] 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.

[0068] Alternatively, if Figure 2 As shown, 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.

[0069] Limiting the width of the first magnetic isolation hole 3 can limit the range span 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 set in the area where the magnetic field density near the permanent magnet 2 is significantly higher than that of other parts. When the ratio of the width of the first magnetic isolation hole 3 to the permanent magnet 2 is less than 0.2, the area that needs to be adjusted cannot be covered. When the ratio of the width of the first magnetic isolation hole 3 to the permanent magnet 2 is greater than 0.35, it will not be able to accurately correspond to the area that needs to be adjusted, which will lead to a weakening of the effect of suppressing torque pulsation and a decrease in motor performance. When the ratio of the width of the first magnetic isolation hole 3 to the permanent magnet 2 is in the range of 0.2-0.35, the first magnetic isolation hole 3 can adjust the area corresponding to the higher magnetic field density, achieve the effect of suppressing torque pulsation, and ensure the output performance of the motor.

[0070] 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.

[0071] Alternatively, if Figure 2 As shown, the thickness of the second magnetic isolation hole 4 is h3, and 0.6≤h3 / h1≤1.

[0072] The second magnetic isolation hole 4 is arranged on the symmetry axis of the first section 21 and the second section 22 of the 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. Taking the thickness h1 of the permanent magnet 2 as 2mm as an example, when the thickness of the second magnetic isolation hole 4 is too small, that is, h3 is less than 0.6*2mm, the degree of assistance is too low, and the optimization effect cannot be further improved. When the thickness of the second magnetic isolation hole 4 is too large, that is, h3 is greater than 1*2mm, the mean value of the motor output torque will drop significantly, affecting the performance of the motor. When the thickness of the second magnetic isolation hole 4 is within the range of 1.2mm-2mm, it can not only guide the direction of the magnetic lines of force, but also reduce the decline in the mean value of the motor torque, thereby ensuring the output performance of the motor.

[0073] 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.

[0074] Alternatively, if Figure 2 As shown, the width of the second magnetic isolation hole 4 is x1, and 0.3≤x1 / y≤0.6.

[0075] When the ratio of the width of the second magnetic isolation hole 4 to the width of the permanent magnet 2 is too small, that is, less than 0.3, the auxiliary degree of the second magnetic isolation hole 4 is too low, and the optimization effect cannot be further improved. When the ratio of the width of the second magnetic isolation hole 4 to the width of the permanent magnet 2 is too large, that is, greater than 0.6, the mean value of the motor output torque will drop significantly, affecting the performance of the motor. When the ratio of the width of the second magnetic isolation hole 4 to the width of the permanent magnet 2 is within the range of 0.3-0.6, it can not only guide the direction of the magnetic lines of force, but also reduce the decrease in the mean value of the motor torque, thereby ensuring the output performance of the motor.

[0076] It can be understood that the ratio of the width of the second magnetic isolation hole 4 to the width of the permanent magnet can be 0.3, 0.4, 0.5 or 0.6.

[0077] Optionally, Figure 3 The schematic diagram of the magnetic force line distribution within the single-pole range of the rotor structure is shown in Figure 1. The first magnetic isolation hole 3 is arranged in parallel with the permanent magnet 2. The purpose is to adjust and optimize the part where the magnetic field increases sharply relatively evenly. The magnetic force lines tend to connect along the path with smaller magnetic resistance. Therefore, near the first magnetic isolation hole 3 set in the present application, the magnetic force 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 of this part. At the same time, the second magnetic isolation hole 4 can avoid excessive increase in magnetic field density at the center, making the overall magnetic field distribution area continuous and smooth, suppressing the torque fluctuation of the motor.

[0078] Optionally, Figure 4 and Figure 5 It is the equivalent magnetic circuit diagram within the single-pole range of the rotor structure, 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 almost does not block the magnetic flux in the thickness direction, it has no obvious 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, Rg is the equivalent magnetic resistance of the air gap in the half-pole range, φg is the air gap flux in the half-pole range, and φm is the flux of the first section 21 of the permanent magnet 2. The magnetic circuit corresponding to the second section 22 of the permanent magnet 2 is combined with the magnetic circuit corresponding to the first section 21 to form a complete closed magnetic circuit, which does not affect the equivalence of each part when analyzing the relationship.

[0079] 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 cross axis direction. There is a negative correlation between inductance and magnetic resistance. Compared with the conventional solution, the present application adds a part of the equivalent magnetic resistance brought by the first magnetic isolation hole 3. Therefore, the direct axis equivalent inductance is reduced, and the cross axis magnetic circuit is almost unaffected. The magnetic resistance torque is the difference between the cross axis equivalent inductance and the direct axis equivalent inductance. Therefore, the cross-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.

[0080] An embodiment of the present disclosure provides a motor, comprising a rotor structure as described in any one of the above embodiments.

[0081] The motor provided in the embodiment of the second aspect of the present application includes the rotor structure described in any one of the embodiments of the first aspect, and thus has all the beneficial effects of the rotor structure described in any one of the embodiments of the first aspect, which will not be repeated here.

[0082] Figure 6 The motor adopts the conventional scheme and the scheme of this application respectively, and the simulation waveforms of the electromagnetic torque of the motor under the same rated current conditions are compared, and the simulation range is two electrical cycles (i.e., the electrical angle is 720deg). The average electromagnetic torque of the motor using the conventional scheme is 8.41Nm, and the torque pulsation rate is 19.85%. The average electromagnetic torque of the motor using the scheme of this application is 8.29Nm, 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 using the scheme of this application. At the same time, the average electromagnetic torque of the motor decreases by only 0.12Nm, accounting for 1.4% of the original electromagnetic torque average value. Among them, the torque pulsation rate is (maximum torque-minimum torque) ÷ torque average value.

[0083] An embodiment of the present disclosure provides a compressor, comprising the motor as described in the above embodiment.

[0084] The compressor provided in the embodiment of the third aspect of the present application includes the motor described in any one of the embodiments of the second aspect, and thus has all the beneficial effects of the motor described in any one of the embodiments of the first aspect, which will not be repeated here.

[0085] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural 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. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A rotor structure, characterized in that: include: 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, characterized in that: There is a deviation angle θ between the first magnetic isolation hole and the permanent magnet. The permanent magnet includes a first section and a second section. The angle between the first section and the second section is α, 0≤θ≤k×|α-90°|, wherein 0<k<1.

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

4. The rotor structure according to any one of claims 1 to 3, characterized in that: The distance between the first magnetic isolation hole and the relative 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, characterized in that: The thickness of the first magnetic isolation hole is h2, 0.35≤h2 / h1≤0.

8.

6. The rotor structure according to claim 4, characterized in that: 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 claim 4, characterized in that: 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 3, characterized in that: 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. A motor, characterized in that: Comprising a rotor structure as claimed in any one of claims 1 to 8.

10. A compressor, characterized in that: Comprising the motor as claimed in claim 9.

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