Rotor punching sheet, motor, compressor and refrigeration equipment

Abstract

The invention discloses a rotor punching sheet, a motor, a compressor and refrigeration equipment, the rotor punching sheet comprises a punching sheet body, the end face of the punching sheet body is provided with a plurality of structure groups, each structure group comprises a first magnetic isolation groove, a magnetic isolation bridge and a mounting groove, the mounting groove is internally provided with a permanent magnet, and the length of the permanent magnet is w1; a mounting groove is formed in the punching sheet body, a first magnetic isolation groove is formed between each of two ends of the mounting groove and the outer peripheral surface of the punching sheet body, so that a magnetic isolation bridge is formed between each first magnetic isolation groove and the outer peripheral surface of the punching sheet body, the length of the magnetic isolation bridge is w2, and the relation range of w1 and w2 is that w2 / w1 is greater than or equal to 0.3 and less than or equal to 0.6. According to the technical scheme, on the premise that the mechanical structure strength of the rotor is guaranteed, the optimal pole-arc coefficient of the motor can be achieved, the no-load back electromotive force harmonic distortion rate, the cogging torque and the torque pulsation of the motor are reduced, the noise vibration of the motor is reduced, and the magnetic leakage is reduced, so that the performance of the motor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a rotor punching sheet, a motor, a compressor and a refrigeration device. Background Art

[0002] Permanent magnet motors have the advantages of high power and high operating efficiency. As the world pays more and more attention to energy issues, permanent magnet motors are becoming more and more important in people's lives. As a result, the requirements for motors are also increasing.

[0003] When designing permanent magnet motor laminations, it is necessary to comprehensively consider the inner and outer diameters, proportions, slot sizes, winding methods, magnet materials, grades, forms, and quantities to achieve the best performance requirements. Among them, the rotor slot size design has a great impact on the back electromotive force and torque pulse of the motor. If the design is unreasonable, the leakage magnetic flux will increase, reducing the performance of the motor. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotor punching sheet, aiming to reduce magnetic leakage and improve the performance of the motor.

[0005] To achieve the above-mentioned purpose, the present invention proposes a rotor punching sheet, which includes a punching sheet body, and a plurality of structural groups are provided on the end surface of the punching sheet body, and the structural groups include a first magnetic isolation groove, a magnetic isolation bridge and a mounting groove, and a permanent magnet is provided in the mounting groove, and the length of the permanent magnet is w1; a first magnetic isolation groove is respectively provided between the two ends of the mounting groove and the outer peripheral surface of the punching sheet body to form the magnetic isolation bridge between the first magnetic isolation groove and the outer peripheral surface of the punching sheet body, and the length of the magnetic isolation bridge is w2, and the relationship range between w1 and w2 is: 0.3≤w2 / w1≤0.6.

[0006] Optionally, the width of the first magnetic isolation groove is d1, the width of the mounting groove is d2, and the relationship between d1 and d2 is 0.3≤d1 / d2≤0.45.

[0007] Optionally, the diameter of the punch body is D, and the relationship between d1 and D is: 0.005≤d1 / D≤0.015.

[0008] Optionally, the mounting groove includes two magnet grooves arranged in a V-shape, each magnet groove is provided with a permanent magnet, the distance between the two magnet grooves gradually increases in the direction away from the center of the punching sheet body, and the first magnetic isolation groove is arranged on the side of the magnet groove close to the outer peripheral surface of the punching sheet body.

[0009] Optionally, a second magnetic isolation groove is provided at the vertex angle position corresponding to the two magnet grooves.

[0010] Optionally, the second magnetic isolation groove is arranged in a triangular shape and connects the two magnet grooves.

[0011] Optionally, the length direction of the magnetic isolation bridge extends along the circumferential direction of the punching sheet body, and the groove side wall of the first magnetic isolation groove close to the outer peripheral surface is arranged in an arc shape.

[0012] Optionally, two opposite ends of the first magnetic isolation groove protrude from two opposite sides of an end of the mounting groove close to the outer peripheral surface.

[0013] Optionally, the first magnetic isolation groove is connected to the mounting groove.

[0014] The present invention also provides a motor, comprising the above-mentioned rotor punching sheet.

[0015] The present invention also provides a compressor, comprising the above-mentioned motor.

[0016] The present invention also provides a refrigeration device, comprising the above-mentioned compressor.

[0017] The above rotor punching has at least the following beneficial effects:

[0018] The technical solution of the present invention adopts a plurality of structural groups provided on the end face of the punch body, wherein the structural groups include a first magnetic isolation groove, a magnetic isolation bridge and a mounting groove, wherein a permanent magnet is provided in the mounting groove, and the length of the permanent magnet is w1; a first magnetic isolation groove is provided between each end of the mounting groove and the outer peripheral surface of the punch body, so as to form the magnetic isolation bridge between the first magnetic isolation groove and the outer peripheral surface of the punch body, and the length of the magnetic isolation bridge is w2, and the relationship between w1 and w2 is in the range of 0.3≤w2 / w1≤0.6. Specifically, limiting the ratio of the length w2 of the magnetic isolation bridge to the length w1 of the permanent magnet to between 0.3 and 0.6 can help the motor achieve the optimal pole arc coefficient, reduce the harmonic distortion rate of the motor's no-load back electromotive force, cogging torque and torque pulsation, reduce the motor's noise vibration and reduce leakage magnetic flux, thereby improving the motor performance, while ensuring the mechanical structural strength of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of a rotor punching sheet of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 The figure is a test comparison of the back-EMF waveform distortion rate and torque ripple of a motor using the rotor punching of the present invention and the back-EMF waveform distortion rate and torque ripple of a motor using the prior art.

[0023] Description of Figure Numbers:

[0024] Label name Label name 100 Film processing body 230 Magnet slot 200 Structure Group 240 The second magnetic isolation groove 210 The first magnetic isolation groove 300 permanent magnet 220 Magnetic isolation bridge

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] The invention provides a rotor punching sheet.

[0031] Reference Figures 1 to 3 In one embodiment of the present invention, the rotor punching sheet includes a punching sheet body 100, and a plurality of structural groups 200 are provided on the end surface of the punching sheet body 100, and the structural group 200 includes a first magnetic isolation groove 210, a magnetic isolation bridge 220 and a mounting groove, and a permanent magnet 300 is provided in the mounting groove, and the length of the permanent magnet 300 is w1; a first magnetic isolation groove 210 is respectively provided between the two ends of the mounting groove and the outer peripheral surface of the punching sheet body 100 to form a magnetic isolation bridge 220 between the first magnetic isolation groove 210 and the outer peripheral surface of the punching sheet body 100, and the length of the magnetic isolation bridge 220 is w2, and the relationship range between w1 and w2 is: 0.3≤w2 / w1≤0.6.

[0032] Specifically, refer to Figure 3 From the test comparison diagram of the back EMF waveform distortion rate and torque pulsation of the motor using the rotor punching of the present invention and the back EMF waveform distortion rate and torque pulsation of the motor with the prior art, it can be seen that the present solution limits the ratio of the length w2 of the magnetic isolation bridge 220 to the length w1 of the permanent magnet 300 to between 0.3 and 0.6. Under the premise of ensuring the strength of the rotor mechanical structure, it can help the motor to achieve the optimal pole arc coefficient, reduce the no-load back EMF harmonic distortion rate, cogging torque and torque pulsation of the motor, reduce the noise and vibration of the motor and reduce leakage magnetic field, thereby improving the electromagnetic performance of the motor.

[0033] Furthermore, a magnetic isolation bridge 220 is provided at both ends of the mounting groove. The provision of the magnetic isolation bridge 220 can enhance the magnetic resistance of the magnetic circuit and reduce the magnetic leakage of the permanent magnet 300, so as to improve the utilization rate of the permanent magnet 300 and ensure the performance of the motor. In addition, the angle between the two end points of the two magnetic isolation bridges 220 is set. The above structural setting can effectively improve the generation of torque pulsation during the operation of the motor, making the operation of the motor more stable and suppressing the generation of motor noise, thereby improving the stability of the compressor having the above motor, reducing the noise of the compressor, and improving the comfort of the user.

[0034] It should be noted that the magnet slot 230 referred to below is one of the two magnet slots 230 with V-shaped structures in the same structure group 200 .

[0035] Furthermore, in this embodiment, eight groups of structure groups 200 are provided on the end surface of the punch body 100, and the two magnet slots 230 in the structure group 200 are symmetrically arranged. Of course, the present invention is not limited thereto, and in other embodiments, six groups of structure groups 200 may also be provided on the end surface of the punch body 100.

[0036] Furthermore, in one embodiment, the provision of the first magnetic isolation groove 210 can not only solve the problem of too large magnetic leakage coefficient of the permanent magnet 300 leading to too low utilization rate of the permanent magnet 300 , but also play a role in axial ventilation.

[0037] Further, in one embodiment, the mass percentage of heavy rare earth elements in the permanent magnet 300 is 0, that is, the permanent magnet 300 does not contain heavy rare earth elements, which reduces the consumption of strategic resources, is conducive to the sustainable development of resources, and reduces the manufacturing cost of the motor, which is suitable for promotion and application. It is understandable that the mass percentage of heavy rare earth elements in the permanent magnet 300 can also be other values, for example, the mass percentage of heavy rare earth elements in the permanent magnet 300 is 0.005%, 0.01%, 0.025%, etc. Among them, the heavy rare earth elements can also include other elements that can become components of the permanent magnet 300.

[0038] Furthermore, in one embodiment, the material used for the permanent magnet 300 may be a neodymium iron boron permanent magnet 300. The neodymium iron boron permanent magnet has excellent magnetic properties and can meet the use requirements of the motor. It is understandable that the permanent magnet 300 may also be other permanent magnets 300 that meet the requirements.

[0039] Optionally, in one embodiment, the punch body 100 is made of a material with high magnetic permeability such as silicon steel sheet. In practice, the permanent magnet 300 (such as a magnet) can be embedded in the magnet slot 230 according to the required polarity direction. Those skilled in the art can understand the setting principle of the magnet slot based on the prior art.

[0040] Furthermore, in one embodiment, the punching sheet body 100 is provided with weight-reducing holes arranged at intervals in the circumferential direction around the shaft mounting hole. The weight-reducing holes can reduce the overall mass of the rotor punching sheet, that is, the rotor core, and can reduce the "centrifugal force" generated during the overall rotation, which is also conducive to reducing stress concentration.

[0041] Further, in one embodiment, the weight-reducing hole is a strip extending in the circumferential direction, and has a smooth contour line. The weight-reducing hole is generally a strip hole, and its two ends can be arc-shaped, and the whole has a smooth contour line to avoid stress concentration.

[0042] Furthermore, the structural group 200 also includes a magnetic flux sorting structure, which is arranged between the magnet groove and the outer peripheral surface of the punching body 100, between the two first magnetic isolation grooves 210, and spaced apart from the magnet grooves 230; setting the magnetic flux sorting structure between the outer peripheral surfaces of the punching body 100, between the two first magnetic isolation grooves 210, and spaced apart from the magnet grooves 230 can change the original magnetic flux line distribution, thereby improving the motor efficiency.

[0043] Furthermore, the magnetic flux sorting structure includes at least two magnetic flux sorting grooves, and at least two magnetic flux sorting grooves are symmetrical about the symmetry axis of the two magnet grooves 230. It should be understood that the main function of the magnetic flux sorting grooves is to ensure the overall mechanical strength of the rotor punching while sorting the magnetic flux, so the requirements for their position and size are not strict, and the requirement for symmetry is only for processing considerations. For example, the magnetic flux sorting grooves can also be asymmetrically distributed, and the magnetic flux sorting grooves can also not use the same size parameters. As long as the structure can sort the magnetic flux lines without destroying the mechanical strength of the punching, it should be regarded as the scope of protection of the claims.

[0044] Furthermore, in one embodiment, the distance between two magnetic flux sorting grooves in the same structure group 200 is gradually increased in a direction away from the outer circumference of the punching sheet body 100 .

[0045] Furthermore, in this embodiment, the magnetic flux arranging structure includes two magnetic flux arranging grooves, which are symmetrically distributed on both sides of the symmetry axis. Of course, the present invention is not limited thereto, and in other embodiments, the magnetic flux arranging structure may also include four magnetic flux arranging grooves.

[0046] Specifically, the width of the first magnetic isolation groove 210 is d1, and the minimum distance between the two adjacent first magnetic isolation grooves 210 in the two adjacent structural groups 200 is also called the pole spacing. The side corresponding to the minimum distance between the two adjacent first magnetic isolation grooves 210 is an arc shape. The design of the size of the first magnetic isolation groove 210 is closely related to the performance of the permanent magnet synchronous motor. When the size of the first magnetic isolation groove 210 is too small, the leakage of this part of the motor will increase, the magnetic flux will be reduced, and the operating efficiency of the motor will be affected; and when the size of the first magnetic isolation groove 210 is too large, it will affect the angle of the magnetic isolation bridge 220. When the rotor structure rotates at a high speed, the permanent magnets 300 in the rotor punching and the magnet slot 230 are both subjected to centrifugal action. The higher the speed, the greater the centrifugal force. Under the action of a large centrifugal force, the insufficient strength of the fragile part of the rotor punching may cause deformation, and its deformation may affect the normal operation of the rotor punching. Therefore, the size design of the first magnetic isolation groove 210 should take into account both the motor efficiency and the strength of the rotor punching, improve the operating efficiency of the motor and ensure the safe operation of the motor.

[0047] Optionally, in this embodiment, the width of the first magnetic isolation groove 210 is d1, the width of the mounting groove is d2, and the relationship between d1 and d2 is 0.3≤d1 / d2≤0.45. It can be understood that by limiting the ratio between the width d1 of the first magnetic isolation groove 210 and the width d2 of the mounting groove to between 0.3 and 0.45, the motor can achieve an optimal pole arc coefficient, reduce the harmonic distortion rate of the motor's no-load back electromotive force, cogging torque and torque pulsation, reduce motor noise and vibration, reduce leakage flux, and thus improve motor performance.

[0048] It should be noted that, when the mounting groove includes two magnet grooves 230 arranged in a V-shape, d2 represents the width of the magnet groove 230 .

[0049] Optionally, in this embodiment, the diameter of the punching sheet body 100 is D, and the relationship between d1 and D is: 0.005≤d1 / D≤0.015; it can be understood that limiting the ratio between the width d1 of the first magnetic isolation groove 210 and the diameter D of the punching sheet body 100 to between 0.005 and 0.015 can enable the motor to achieve the optimal pole arc coefficient, reduce the harmonic distortion rate of the motor's no-load back electromotive force, cogging torque and torque pulsation, reduce motor noise and vibration, reduce leakage magnetic field, and thus improve motor performance.

[0050] Optionally, in this embodiment, the mounting groove includes two magnet grooves 230 arranged in a V shape, each of which is provided with a permanent magnet 300, and the distance between the two magnet grooves 230 gradually increases in the direction away from the center of the sheet body 100, and the first magnetic isolation groove 210 is arranged on the side of the outer peripheral surface of the first magnetic isolation groove 210 close to the sheet body 100; the two magnet grooves 230 arranged in a V shape are conducive to further enhancing the anti-demagnetization ability of the motor. Furthermore, the two magnet grooves 230 are arranged symmetrically about the d axis of the rotor sheet. Symmetry about the d axis means that the two magnet grooves 230 are symmetrical about the axis where the symmetry center line of the magnetic pole is located. The two magnet grooves 230 are arranged in a V shape, and the opening of the V shape is arranged toward the outer circle of the sheet body 100. The magnetic circuit of the two magnet grooves 230 arranged in a V shape can improve the reluctance effect, increase the reluctance torque, enhance the rotor flux, reduce the iron loss in the high-speed zone, and reduce the torque fluctuation.

[0051] Of course, the present invention is not limited to this. In the second embodiment, the mounting groove can also be a straight groove, which is convenient for processing and is conducive to reducing manufacturing costs. Of course, the present invention is not limited to this. In the third embodiment, the mounting groove can also be a W-shaped groove. The different structures of the mounting groove can meet the needs of the permanent magnet 300 that are not structurally sufficient, and are suitable for expanding the scope of use of the product.

[0052] In addition, the magnet slot 230 may also be in a trapezoidal, circular, elliptical, fan-shaped, triangular, truncated cone, "L" shape, "U" shape, "C" shape, or the like.

[0053] Furthermore, the magnet slot 230 is rectangular, which can adapt to the rectangular cross-section of the magnet. In order to eliminate stress concentration at each corner, a stress release hole connected to the magnet slot 230 is provided to remove the sharp shape at the corner.

[0054] It should be noted that installation grooves of different shapes can be provided according to different requirements, that is, the shapes of the installation grooves of the same rotor core can be the same or different.

[0055] Optionally, in one embodiment, second magnetic isolation grooves 240 are provided at the vertex positions corresponding to the two magnet grooves 230 . The provision of the second magnetic isolation grooves 240 can reduce magnetic leakage and improve motor performance.

[0056] Optionally, in one embodiment, the second magnetic isolation groove 240 is arranged in a triangular shape and is connected to the two magnet grooves 230. Of course, the present invention is not limited thereto. In other embodiments, the second magnetic isolation groove 240 may not be connected to the two magnet grooves 230. The two straight walls of the second magnetic isolation groove 240 are respectively at equal angles to the nearest groove walls of the magnet grooves 230 on both sides. Two straight arms of equal width and an arc-shaped arm of equal width together form a magnetic isolation bridge. The walls of the magnetic isolation bridge are of equal width, which can prevent magnetic leakage and try to make the magnetic lines of force form a short circuit in the rotor, so that the magnetic lines of force of the magnetic isolation bridge are saturated, and the air gap flux of the second magnetic isolation groove is reduced.

[0057] Optionally, in one embodiment, the length direction of the magnetic isolation bridge 220 extends along the circumference of the punch body 100, and the side wall of the first magnetic isolation groove 210 close to the outer peripheral surface is arranged in an arc shape; the side of the first magnetic isolation groove 210 close to the outer peripheral surface is arranged in an arc shape, which can ensure the magnetic cutting width, reduce magnetic leakage, and ensure the performance of the motor. Of course, the present invention is not limited to this. In some other embodiments, the length direction of the magnetic isolation bridge 220 extends along the circumference of the punch body 100, and the side of the first magnetic isolation groove 210 close to the outer peripheral surface can also be arranged in a straight line.

[0058] Furthermore, the first magnetic isolation groove 210 may also be rectangular or elliptical.

[0059] It should be noted that when the side wall of the first magnetic isolation groove 210 close to the outer circumference is arranged in an arc shape, w2 represents the arc length of the magnetic isolation bridge 220 .

[0060] Optionally, in one embodiment, opposite ends of the first magnetic isolation groove 210 protrude from opposite sides of one end of the mounting groove close to the outer circumference, which can reduce magnetic leakage and thus improve motor performance.

[0061] Furthermore, the first end of the first magnetic isolation groove 210 extends toward another structure group 200, and the second end of the first magnetic isolation groove 210 extends toward the structure group 200, and the protruding length of the first end is greater than the protruding length of the second end.

[0062] Optionally, in one embodiment, the first magnetic isolation slot 210 is connected to the magnet slot 230, which can reduce magnetic leakage and thus improve motor performance.

[0063] Furthermore, the rotor punching sheets can be stacked and connected to form a rotor core. The punching sheet body 100 of the rotor punching sheet is roughly formed into a circle, and a shaft mounting hole is provided at the center thereof to be connected to the shaft of the rotor.

[0064] Furthermore, a central shaft hole is provided at the center of the punch body 100, and a central shaft hole keyway hole extending outward is provided at the edge of the central shaft hole, so that the central shaft hole keyway hole is used to realize the fixed limit of the rotating shaft.

[0065] Furthermore, in this embodiment, the cross section of the key slot of the central shaft hole is in an arc shape. Of course, the present invention is not limited thereto, and in other embodiments, the cross section of the key slot of the central shaft hole may also be in a square shape.

[0066] Furthermore, in this embodiment, the rotor punching sheet further includes a plurality of rivet holes, and the plurality of rivet holes are evenly arranged on the surface of the punching sheet body 100 along the circumferential direction of the punching sheet body 100 .

[0067] The present invention also proposes a motor, which includes a rotor punching. The specific structure of the rotor punching refers to the above-mentioned embodiment. Since this motor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0068] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0069] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0070] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A rotor punching, characterized in that: The rotor punching sheet includes a punching sheet body, and a plurality of structural groups are arranged on the end surface of the punching sheet body, and the structural groups include a first magnetic isolation groove, a magnetic isolation bridge and a mounting groove. A permanent magnet is arranged in the mounting groove, and the length of the permanent magnet is w1; a first magnetic isolation groove is respectively arranged between the two ends of the mounting groove and the outer peripheral surface of the punching sheet body to form the magnetic isolation bridge between the first magnetic isolation groove and the outer peripheral surface of the punching sheet body, and the length of the magnetic isolation bridge is w2, and the relationship range between w1 and w2 is: 0.3≤w2 / w1≤0.

6.

2. The rotor punching according to claim 1, characterized in that: The width of the first magnetic isolation groove is d1, the width of the mounting groove is d2, and the relationship between d1 and d2 is 0.3≤d1 / d2≤0.

45.

3. The rotor punching according to claim 2, characterized in that: The diameter of the punch body is D, and the relationship between d1 and D is: 0.005≤d1 / D≤0.

015.

4. The rotor punching according to claim 1, characterized in that: The mounting groove includes two magnet grooves arranged in a V shape, each of the magnet grooves is provided with a permanent magnet, and the distance between the two magnet grooves gradually increases in the direction away from the center of the punching sheet body. The first magnetic isolation groove is arranged on the side of the magnet groove close to the outer peripheral surface of the punching sheet body.

5. The rotor punching according to claim 4, characterized in that: A second magnetic isolation groove is arranged at the vertex positions corresponding to the two magnet grooves.

6. The rotor punching according to claim 5, characterized in that: The second magnetic isolation groove is arranged in a triangular shape and connects the two magnet grooves.

7. The rotor punching according to claim 1, characterized in that: The length direction of the magnetic isolation bridge extends along the circumferential direction of the punching sheet body, and the groove side wall of the first magnetic isolation groove close to the outer peripheral surface is arranged in an arc shape.

8. The rotor punching according to claim 1, characterized in that: The opposite ends of the first magnetic isolation groove protrude from the opposite sides of one end of the installation groove close to the outer peripheral surface.

9. The rotor punching according to claim 1, characterized in that: The first magnetic isolation groove is communicated with the mounting groove.

10. A motor, characterized in that: Comprising a rotor punching sheet as claimed in any one of claims 1 to 9.

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

12. A refrigeration device, characterized in that: Comprising the compressor of claim 11.

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