Rotor core, motor and compressor

Abstract

This application relates to a rotor core, a motor and a compressor. The rotor core includes: in a plane perpendicular to the central axis of the rotor core, the outer periphery of the rotor core includes a plurality of arc groups arranged alternately in the circumferential direction, and each arc group includes a first eccentric arc segment, a second eccentric arc segment, and a third positive arc segment connected in sequence; the maximum distances from the first eccentric arc segment, the second eccentric arc segment, and the third positive arc segment to the second axis are H1, H2, and H3 respectively; H1 < H2 < H3. The solution provided by this application enables the stator to be periodically conducted by the rotor magnetic field during the operation of the motor, making the magnetic field operation between the motors more uniform, optimizing the magnetic circuit direction, preventing the magnetic field from being too strong or too weak, thereby adjusting the air-gap magnetic density to make the air-gap magnetic density of the motor more sinusoidal, effectively reducing the 0th-order radial force wave, and further reducing the vibration and noise of the compressor.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to rotors, motors and compressors. Background Art

[0002] Permanent magnet synchronous motors (PMSMs) are widely used in household appliances such as air conditioner compressors due to their high efficiency. However, with increasing national standards for air conditioners, manufacturers are encouraged to optimize and improve the efficiency of existing air conditioner components. As motors gradually develop towards higher energy efficiency and lower noise levels, the high harmonics of the magnetic flux density in the air gap between the rotor and stator during motor operation are a major factor contributing to increased vibration, noise, and deformation.

[0003] Therefore, this application will invent and design the motor structure so that the rotor can effectively optimize the waveform of the radial motor magnetism. By optimizing the radial electromagnetic force waveform, its harmonic content can be reduced, thereby avoiding the increase in harmonic content leading to resonance during motor operation and high motor noise. Summary of the Invention

[0004] In order to overcome the problems existing in the related art, the present application provides a rotor core, a motor and a compressor, wherein the rotor core can effectively optimize the waveform of the back electromotive force and the radial motor magnetism. By optimizing the waveform of the back electromotive force and the radial electromagnetic force, the harmonic content thereof can be reduced, thereby avoiding the increase in the harmonic content leading to resonance during the operation of the motor.

[0005] A first aspect of the present application provides a rotor core, comprising: in a plane perpendicular to a central axis of the rotor core, the outer periphery of the rotor core comprises a plurality of circular arc groups alternately arranged along a circumferential direction;

[0006] The arc group includes a plurality of arc segments, and the center of any of the arc segments is located on the axis of the rotor core;

[0007] The centers of the other arc segments are located outside the axis of the rotor core.

[0008] In one embodiment, the arc group includes a first eccentric arc segment, a second eccentric arc segment, and a third positive arc segment connected in sequence;

[0009] The center of the third positive circular arc segment is located on the axis of the rotor core;

[0010] The centers of the first eccentric arc segment and the second eccentric arc segment are located outside the axis of the rotor core.

[0011] In one embodiment, a straight line passing through the midpoint of the third circular arc segment and the center of the circle is the first axis, and a straight line perpendicular to the first axis is the second axis.

[0012] The maximum distances from the first eccentric arc segment, the second eccentric arc segment and the third regular arc segment to the second axis are H1, H2 and H3 respectively; H1 <H2<H3。

[0013] A second aspect of the present application provides a motor, comprising the aforementioned rotor core and a stator core, wherein the rotor core is nested inside the stator core, the stator core comprises stator teeth and stator slots, and the stator slots and stator teeth are sequentially distributed, and is characterized in that:

[0014] The slot width of the stator slot is W;

[0015] The arc length of the first eccentric arc segment is A1, and 0.93≤W / A1≤1.1.

[0016] In one embodiment, the stator teeth include tooth shoes 51; the tooth shoes are located on the inner periphery of the stator core.

[0017] The width of the tooth shoe 51 is B; the length of the second eccentric arc segment is A2, and 0.82≤B / A2≤0.98.

[0018] In one embodiment, the stator teeth have a tooth width of C;

[0019] The arc length of the third perfect circular arc segment is A3, and 0.94≤C / A3≤1.05.

[0020] In one embodiment, the sum of A1 and A2 is A12;

[0021] 0.55 <A12 / A3<0.625。

[0022] In one embodiment, the included angle between the cutting edge of the tooth shoe and the center line of the stator tooth is α, 81.5°<α<82.5°.

[0023] In one embodiment, the outer periphery of the rotor core also includes a fourth eccentric circular arc segment, the first eccentric circular arc segment, the second eccentric circular arc segment, the third positive circular arc segment and the fourth eccentric circular arc segment are connected in sequence, and the arc length of the fourth eccentric circular arc segment is A4, 0.82≤B / A4≤0.98.

[0024] In one embodiment, a magnetic steel slot is provided on the rotor core, the magnetic steel slot is used to place the magnetic steel, and the length of the magnetic steel is L2; the distance between the distal ends of the slots of adjacent stator slots is L1, and the distal end of the slot is the end of the slot away from the stator teeth between adjacent stator slots; 1≤L1 / L2≤1.05.

[0025] In one embodiment, the rotor core is further provided with magnetic isolation slots;

[0026] After the magnetic steel is placed in the magnetic steel slot, the magnetic isolation slot is arranged at the intersection of the radial outer ends of both ends of the magnetic steel and the outer periphery of the rotor core.

[0027] A third aspect of the present application provides a compressor, comprising: the rotor core or the motor mentioned in the above embodiment.

[0028] The technical solution provided by the present application can have the following beneficial effects: in a plane perpendicular to the central axis of the rotor core, the outer periphery of the rotor core includes a plurality of circular arc groups alternately arranged along the circumferential direction; characterized in that:

[0029] The arc group includes a plurality of arc segments, and the center of any arc segment is located on the axis of the rotor core;

[0030] The centers of the other arc segments are located outside the axis of the rotor core.

[0031] The present application arranges a plurality of arc groups alternately along the circumferential direction on the outer circumference of the rotor core, wherein the arc groups include arc segments whose centers are located on the axis of the rotor core and arc segments whose centers are located outside the axis of the rotor core, so that the outer circumference of the rotor core of the motor can form a periodic irregular circle. During the operation of the motor, the stator can be subjected to the periodic conduction of the rotor magnetic field, so that the magnetic field between the motors can run more evenly, the direction of the magnetic circuit can be optimized, and the magnetic field will not be too strong or too weak, thereby adjusting the air gap magnetic density, making the air gap magnetic density of the motor more sinusoidal, and effectively reducing the 0th order radial force wave, thereby avoiding the increase of harmonic content causing resonance during the operation of the motor and high motor noise.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0034] Figure 1 Schematic diagram of the rotor core and stator core structure of the motor shown in the embodiment of the present application;

[0035] Figure 2 It is an enlarged schematic diagram of the local structure of the rotor core shown in an embodiment of the present application.

[0036] Reference numerals:

[0037] 1. First eccentric arc segment; 2. Second eccentric arc segment; 3. Third positive arc segment; 4. Fourth eccentric arc segment; 5. Stator tooth; 51. Tooth shoe; 511. Shoe bottom; 512. Shoe surface; 6. Stator slot; 7. Magnetic steel slot; 8. Magnetic steel; 9. Magnetic isolation slot; 11. First axis; 12. Second axis. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0039] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0040] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] Example 1

[0042] Permanent magnet synchronous motors (PMSMs) are widely used in household appliances such as air conditioner compressors due to their high efficiency. However, with increasing national standards for air conditioners, manufacturers are encouraged to optimize and improve the efficiency of existing air conditioner components. As motors gradually develop towards higher energy efficiency and lower noise levels, the high harmonics of the magnetic flux density in the air gap between the rotor and stator during motor operation are a major factor contributing to increased vibration, noise, and deformation.

[0043] Therefore, this application will invent and design the motor structure so that the rotor can effectively optimize the waveform of the radial motor magnetism. By optimizing the radial electromagnetic force waveform, its harmonic content can be reduced, thereby avoiding the increase in harmonic content leading to resonance during motor operation and high motor noise.

[0044] The technical solutions of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0045] Figure 1 It is a schematic structural diagram of the rotor core and stator core of the motor shown in the embodiments of the present application;

[0046] Figure 2 It is an enlarged schematic diagram of a partial structure of the rotor core shown in the embodiments of the present application.

[0047] Refer to Figure 1 and Figure 2 .

[0048] In the plane perpendicular to the central axis of the rotor core, the outer periphery of the rotor core includes a plurality of arc groups arranged alternately in the circumferential direction;

[0049] Each arc group includes a plurality of arc segments, and the center of any arc segment is located on the axis of the rotor core;

[0050] The centers of other arc segments are located outside the axis of the rotor core

[0051] The arc group includes a first eccentric arc segment 1, a second eccentric arc segment 2, and a third positive arc segment 3;

[0052] The center of the third positive arc segment 3 is located on the axis of the rotor core;

[0053] The centers of the first eccentric arc segment 1 and the second eccentric arc segment 2 are located outside the axis of the rotor core.

[0054] The straight line passing through the midpoint and the center of the third positive arc segment 3 is the first axis 11, and the straight line perpendicular to the first axis 11 is the second axis 12.

[0055] The maximum distances from the first eccentric arc segment 1, the second eccentric arc segment 2, and the third positive arc segment 3 to the second axis 12 are H1, H2, and H3 respectively; H1 < H2 < H3.

[0056] Exemplarily, the first axis and the second axis of the present application are not unique, but when setting and defining the above distance conditions, that is, the maximum distances from the first eccentric arc segment 1, the second eccentric arc segment 2, and the third positive arc segment 3 to the second axis are H1, H2, and H3 respectively; H1 < H2 < H3, the second axis should be selected as the second axis perpendicular to the first axis in this arc group.

[0057] In the plane perpendicular to the central axis of the rotor core, the arc group includes a first eccentric arc segment 1, a second eccentric arc segment 2, and a third positive arc segment 3 connected in sequence;

[0058] Exemplarily, a permanent magnet synchronous motor generates a reverse voltage during operation, i.e., back electromotive force; the reason is that a closed coil moves in a magnetic field due to the application of current, and when moving, an induced electromotive force is generated due to the change in the magnetic flux passing through it. This electromotive force must hinder the directional movement of charges in the coil. The outer circle of the rotor core in this application adopts first eccentric arc segments 1, second eccentric arc segments 2, and third positive arc segments 3 that are alternately arranged along the circumference and connected in sequence.

[0059] The center of the third positive arc segment 3 is located on the axis of the rotor core; the design that the centers of the first eccentric arc segment 1 and the second eccentric arc segment 2 are located outside the axis of the rotor core enables the stator core to be periodically conducted by the rotor core magnetic field stage during the operation of the motor, making the magnetic field operation between the motors more uniform and sinusoidally distributed, optimizing the magnetic circuit direction of the motor, and preventing the occurrence of over-strong or over-weak magnetic fields. The uniform propagation of the magnetic field between the stator and rotor can optimize the back electromotive force waveform; when operating under load, the amplitude distribution of the magnetic pull force is affected by the sinusoidal waveform of the air-gap magnetic density. The outer circle of the rotor core in the embodiment of this application adopts multiple arc segments to optimize the air-gap magnetic density, making the air-gap magnetic density of the motor more sinusoidal, effectively reducing the 0th-order radial force wave, and thus reducing the vibration and noise of the compressor. The amplitude distribution of the magnetic pull force on the outer circle of the rotor core will also be more evenly distributed.

[0060] Beneficial effects of the embodiment of this application: By setting the rotor core as an outer circle structure with several arc groups alternately arranged along the circumference, where each arc group includes a first eccentric arc segment, a second eccentric arc segment, and a third positive arc segment connected in sequence, the outer circumference of the rotor of this motor can form an irregular circle. The maximum distances from the first eccentric arc segment, the second eccentric arc segment, and the third positive arc segment to the second axis are H1, H2, and H3 respectively; the combination of the H1 < H2 < H3 structure enables the stator to be periodically conducted by the rotor magnetic field stage during the operation of the motor, making the magnetic field operation between the motors more uniform, optimizing the magnetic circuit direction, preventing the occurrence of over-strong or over-weak magnetic fields, thereby adjusting the air-gap magnetic density, making the air-gap magnetic density of the motor more sinusoidal, effectively reducing the 0th-order radial force wave, and further reducing the vibration and noise of the compressor.

[0061] Embodiment 2

[0062] Corresponding to the above Embodiment 1, the embodiment of this application provides a motor, and the motor in the embodiment of this application includes the rotor core of the above Embodiment 1.

[0063] The motor in the embodiment of this application includes a rotor core and a stator core. In a plane perpendicular to the central axis of the rotor core, the outer circumference of the rotor core includes first eccentric arc segments 1, second eccentric arc segments 2, and third positive arc segments 3 that are alternately arranged along the circumference and connected in sequence; the center of the third positive arc segment 3 is located on the axis of the rotor core;

[0064] The centers of the first eccentric arc segment 1 and the second eccentric arc segment 2 are located outside the axis of the rotor core; the maximum distances from the first eccentric arc segment 1, the second eccentric arc segment 2 and the third positive arc segment 3 to the second axis are H1, H2, and H3 respectively; H1 <H2<H3。

[0065] Furthermore, the motor of the embodiment of the present application further includes a stator core, the rotor core is nested inside the stator core, the stator core includes stator teeth 5 and stator slots 6, the stator slots 6 and the stator teeth 5 are sequentially distributed, and the slot width of the stator slots 6 is W; the slot width of the stator slots 6 is as follows: Figure 1 As shown, it is the distance between the two ends of the stator slot 6.

[0066] The arc length of the first eccentric arc segment 1 is A1. The arc length of the first eccentric arc segment 1 is as follows: Figure 2 As shown, it is the distance between the two ends of the first eccentric arc segment 1. For example, in the embodiment of the present application, the arc length of the first eccentric arc segment 1 is designed to be: 0.93≤W / A1≤1.1.

[0067] The stator teeth include tooth shoes 51; the tooth shoes 51 are located on the inner periphery of the stator core.

[0068] The width of the tooth shoe 51 is B; the width of the tooth shoe 51 of the stator tooth 5 is B; Figure 1 As shown, the stator tooth 5 of the embodiment of the present application includes two tooth shoes 51. The tooth shoe 51 of the stator tooth 5 of the embodiment of the present application includes a shoe bottom 511 and a shoe surface 512. The width of the tooth shoe 51 of the stator tooth 5 refers to the width of the shoe surface 512. Figure 1 shown.

[0069] The arc length of the second eccentric arc segment 2 is A2. The arc length of the second eccentric arc segment 2 is as follows: Figure 2 As shown, it is the distance between the two ends of the second eccentric arc segment 2. For example, the arc length of the second eccentric arc segment 2 and the tooth shoe 51 of the motor of the present application are designed to be: 0.82≤B / A2≤0.98.

[0070] The tooth width of the stator teeth 5 is C; the tooth width of the stator teeth 5 of this application is as follows Figure 1 shown.

[0071] The arc length of the third perfect circular arc segment 3 is A3. The arc length of the third perfect circular arc segment 3 is as follows: Figure 2 The figure shows an example of the distance between the two ends of the third positive circular arc segment 3. The arc length and tooth width of the motor of the present application are designed to be 0.94≤C / A3≤1.05.

[0072] Furthermore, in the embodiment of the present application, it is also designed that the sum of A1 and A2 is A12; 0.55 < A12 / A3 < 0.625. A12 is the sum of the arc lengths of the first eccentric circular arc segment 1 and the second eccentric circular arc segment 2. The ratio of the sum of the arc lengths of the first eccentric circular arc segment 1 and the second eccentric circular arc segment 2 to the arc length of the third positive circular arc segment 3 in the embodiment of the present application is less than 0.625 times and greater than 0.55.

[0073] The outer periphery of the rotor core further includes a fourth eccentric circular arc segment 4, and the first eccentric circular arc segment 1, the second eccentric circular arc segment 2, the third positive circular arc segment 3 and the fourth eccentric circular arc segment 4 are connected in sequence.

[0074] The arc length of the fourth eccentric circular arc segment 4 is A4, and 0.82 ≤ B / A4 ≤ 0.98.

[0075] The above invention designs of the first eccentric circular arc segment 1, the second eccentric circular arc segment 2, the third positive circular arc segment 3, the fourth eccentric circular arc segment 4, the slot width of the stator slot 6, the width of the tooth boot 51 of the stator tooth 5 and the tooth width of the stator tooth 5 enable the motor with this structure to have the stator core subjected to the periodic conduction of the rotor core magnetic field during operation, making the magnetic field operation between the motors more uniform and sinusoidally distributed, optimizing the magnetic circuit direction of the motor, and preventing the phenomenon of too strong or too weak magnetic field. The uniform propagation of the magnetic field between the stator and the rotor can optimize the back electromotive force waveform; when operating under load, the magnitude distribution of the magnetic pull force amplitude is affected by the sinusoidal waveform of the air-gap magnetic density. The outer circle of the rotor core in the embodiment of the present application adopts multiple circular arcs to optimize the air-gap magnetic density, making the air-gap magnetic density of the motor more sinusoidal, effectively reducing the 0th-order radial force wave, and further reducing the vibration and noise of the compressor. The magnitude distribution of the magnetic pull force on the outer circle of the rotor core will also be more evenly distributed.

[0076] The included angle between the trimmed edge of the tooth boot 51 and the center line of the stator tooth is α, and 81.5° < α < 82.5°.

[0077] The trimmed edge of the tooth boot 51 in the embodiment of the present application refers to the trimmed edge of the boot bottom 511, as Figure 1 shown. Exemplarily, the included angle between the trimmed edge of the tooth boot 51 and the first axis in the embodiment of the present application is α, and 81.5° < α < 82.5°. This angle range makes the no-load torque waveform of the motor closest to the sine wave and the amplitude minimum. It effectively reduces the cogging torque fluctuation during the no-load operation of the motor.

[0078] Embodiment Three

[0079] The above-mentioned embodiments include the inventive design of the first eccentric arc segment 1, the second eccentric arc segment 2, the third positive arc segment 3, and the fourth eccentric arc segment 4, the slot width of the stator slot 6, the width of the tooth shoe 51 of the stator tooth 5, and the tooth width of the stator tooth 5, as well as the inventive design of the angle between the cutting edge of the tooth shoe 51 and the centerline of the stator tooth. This reduces the motor's cogging torque during operation, reduces the amplitude of the motor's speed fluctuation during operation, optimizes the back EMF and radial motor magnetic waves, and thus reduces the motor's electromagnetic noise. The present embodiments will further provide inventive design for the motor.

[0080] In addition to the structural features of the above-mentioned embodiment 1 or embodiment 2, the motor of the embodiment of the present application further includes a magnetic steel slot 7 provided on the rotor core, in which a magnetic steel 8 is placed. The length of the magnetic steel 8 is L2. The length of the magnetic steel in the embodiment of the present application refers to the dimension of the magnetic steel in the circumferential direction in a plane perpendicular to the central axis of the rotor core after the magnetic steel is placed in the magnetic steel slot, such as Figure 1 shown.

[0081] The stator slots 6 and the stator teeth 5 are distributed sequentially. A magnetic steel slot 7 is provided on the rotor core. The magnetic steel slot 7 is used to place the magnetic steel 8. The length of the magnetic steel 8 is L2. The distance between the distal ends of adjacent stator slots 6 is L1. The distal end of the slot is the end of the slot away from the stator tooth 5 between adjacent stator slots. 1≤L1 / L2≤1.05.

[0082] This structural setting can improve the utilization rate of the magnetic steel 8, thereby improving the performance of the motor.

[0083] Furthermore, the rotor core is also provided with a magnetic isolation slot 9;

[0084] After the magnetic steel 8 is placed in the magnetic steel slot 7, the magnetic isolation slot 9 is provided at the intersection of the radial outer ends of both ends of the magnetic steel 8 and the outer periphery of the rotor core.

[0085] That is, magnetic isolation slots 9 are provided at the radial intersection of the two ends of the magnetic steel 8 at the outer periphery of the rotor core. The magnetic isolation slots 9 are in the shape of circular arcs. The circular arc structure of the magnetic isolation slots 9 can prevent the magnetic isolation slots 9 from being too far away from the magnetic steel 8, which would cause large magnetic leakage and reduce the operating performance of the motor.

[0086] The embodiments of the present application improve the utilization rate of magnetic steel and reduce motor magnetic leakage, thereby improving the electromagnetic efficiency of the motor.

[0087] Example 4

[0088] The present invention provides a compressor comprising the rotor core of the first embodiment or the motor of the second or third embodiment. The compressor has all the beneficial effects of the rotor core or motor described above. The derivation process of the beneficial effects is the same as that of the above embodiments, and the present invention does not further elaborate on them in detail.

[0089] The compressor provided in the embodiment of the present application has the characteristics of high energy efficiency and low noise.

[0090] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A rotor core, wherein the outer periphery of the rotor core comprises a plurality of circular arc groups alternately arranged along the circumferential direction in a plane perpendicular to the central axis of the rotor core; characterized in that: The arc group includes a plurality of arc segments, and the center of any of the arc segments is located on the axis of the rotor core; The centers of the other arc segments are located outside the axis of the rotor core; The circular arc group comprises a first eccentric circular arc segment (1), a second eccentric circular arc segment (2), and a third positive circular arc segment (3) which are connected in sequence; The center of the third positive circular arc segment (3) is located on the axis of the rotor core; The centers of the first eccentric arc segment (1) and the second eccentric arc segment (2) are located outside the axis of the rotor core; The motor includes a rotor core, and the motor also includes a stator core, wherein the rotor core is nested inside the stator core, and the stator core includes stator teeth (5) and stator slots (6), wherein the stator slots (6) and the stator teeth (5) are distributed in sequence; The slot width of the stator slot (6) is W; The arc length of the first eccentric arc segment (1) is A1, 0.93≤W / A1≤1.1; The included angle between the cutting edge of the tooth shoe (51) and the center line of the stator tooth is α, 81.5°<α<82.5°, so as to reduce the cogging torque fluctuation when the motor is running at no load.

2. The rotor core according to claim 1, wherein: The straight line passing through the midpoint of the third circular arc segment and the center of the circle is the first axis (11), and the straight line perpendicular to the first axis is the second axis (12). The maximum distances from the first eccentric arc segment (1), the second eccentric arc segment (2) and the third positive arc segment (3) to the second axis (12) are H1, H2, and H3 respectively; H1 <H2<H3。 3. The rotor core according to claim 1, wherein: The stator teeth include tooth shoes (51); the tooth shoes (51) are located on the inner periphery of the stator core, The width of the tooth shoe (51) is B; The arc length of the second eccentric arc segment (2) is A2, 0.82≤B / A2≤0.

98.

4. The rotor core according to claim 3, wherein: The tooth width of the stator teeth (5) is C; The arc length of the third perfect circular arc segment (3) is A3, 0.94≤C / A3≤1.

05.

5. The rotor core according to claim 4, characterized in that: The sum of A1 and A2 is A12; 0.55 <A12 / A3<0.625。 6. The rotor core according to claim 1, wherein: The arc group further comprises a fourth eccentric arc segment (4), wherein the first eccentric arc segment (1), the second eccentric arc segment (2), the third positive arc segment (3) and the fourth eccentric arc segment (4) are connected in sequence. The arc length of the fourth eccentric arc segment (4) is A4, and 0.82≤B / A4≤0.

98.

7. The rotor core according to claim 1, wherein: The rotor core is provided with a magnetic steel slot (7), the magnetic steel slot (7) is used to place a magnetic steel (8), and the length of the magnetic steel (8) is L2; the distance between the distal ends of the slots of adjacent stator slots (6) is L1, and the distal ends of the slots are the ends of the slots away from the stator teeth (5) between the adjacent stator slots; 1≤L1 / L2≤1.

05.

8. The rotor core according to claim 7, wherein: The rotor core is further provided with a magnetic isolation groove (9); After the magnetic steel (8) is placed in the magnetic steel slot (7), the magnetic isolation slot (9) is provided at the intersection of the radial outer ends of both ends of the magnetic steel (8) and the outer periphery of the rotor core.

9. A compressor, characterized in that: The invention comprises the rotor core according to claim 1.

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