Rotor structure, motor and compressor

Abstract

The present invention provides a rotor structure, a motor and a compressor. 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 include a plurality of N poles and a plurality of S poles alternately arranged along the circumferential direction of the rotor core. At least one magnetic pole of the rotor core is provided with a magnetic isolation hole. Along the direction away from the axis of the rotor core, the magnetic isolation hole has a first hole body portion and a second hole body portion. The minimum width of the first hole body portion is greater than the maximum width of the second hole body portion. Wherein, the width directions of the first hole body portion and the second hole body portion are both perpendicular to the distribution direction of the first hole body portion and the second hole body portion. Through the above arrangement of the present invention, the problem of relatively large vibration and noise of the motor in the prior art is solved.

Description

Technical Field

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

[0002] In recent years, with the development of permanent magnet material manufacturing technology and the rapid decline in cost, due to its excellent performance and low price, it has greatly promoted the development of permanent magnet motor technology. The rich resources of permanent magnet materials have promoted the research and development of permanent magnet motor technology.

[0003] Permanent magnet motors generate the main magnetic field by permanent magnets. Compared with ordinary induction motors, permanent magnet synchronous motors do not require reactive excitation current, and the rotor resistance loss is zero in the synchronous operation state. Therefore, it has the characteristics of high power factor and high efficiency, and can usually be used to replace induction motors with lower energy efficiency indicators, and its economic and social benefits are very significant, and it is widely used in all walks of life.

[0004] However, for the permanent magnet material of permanent magnet synchronous motors, the magnetic energy product of permanent magnets with fixed grades and materials remains unchanged, and it is difficult to adjust the air-gap magnetic field of the motor. At the same time, the tooth-slot structure of the motor makes the harmonic content of the air-gap magnetic density and back electromotive force relatively large, and the peak value of the electromagnetic force of the motor is large, resulting in relatively large torque ripple and vibration noise of the motor. Summary of the Invention

[0005] The main purpose of the present invention is to provide a rotor structure, a motor, and a compressor to solve the problem of relatively large vibration noise of motors in the prior art.

[0006] To achieve the above object, according to the first aspect of the present invention, a rotor structure is provided, including 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 include a plurality of N poles and a plurality of S poles alternately arranged along the circumferential direction of the rotor core; at least one magnetic pole of the rotor core is provided with a magnetic isolation hole. Along the direction away from the axis of the rotor core, the magnetic isolation hole has a first hole body portion and a second hole body portion; the minimum width of the first hole body portion is greater than the maximum width of the second hole body portion; wherein, the width direction of the first hole body portion and the second hole body portion is the direction perpendicular to the distribution direction of the first hole body portion and the second hole body portion.

[0007] Furthermore, the first hole body portion and the second hole body portion are distributed along the radial direction of the rotor core; or the distribution direction of the first hole body portion and the second hole body portion is distributed in the direction parallel to the magnetic pole center line of the corresponding magnetic pole.

[0008] Furthermore, the maximum width of the first hole body portion is A, the maximum width of the second hole body portion is B, and the minimum distance between the first hole body portion and the permanent magnet on one side of the corresponding magnetic pole is C; wherein, 10≥(A + C) / B≥2.

[0009] Further, the minimum distance between the first hole body part and the permanent magnet on one side of the corresponding magnetic pole is C, and the remanence of the permanent magnet is Br; wherein, 9 ≥ C / Br ≥ 1.

[0010] Further, each magnetic pole includes a plurality of magnetic isolation holes, and the plurality of magnetic isolation holes are arranged in pairs; taking the axis perpendicular to the rotor core as a predetermined plane, the projections of the two paired magnetic isolation holes on the predetermined plane are symmetrically arranged with respect to the magnetic pole center line of the corresponding magnetic pole.

[0011] Further, an intermediate magnetic bridge is formed between the two paired magnetic isolation holes. The intermediate magnetic bridge has a first end and a second end distributed along the axis away from the rotor core. The width of the first end is smaller than that of the second end; wherein, the width directions of the first end and the second end are both the distribution direction between the two paired magnetic isolation holes.

[0012] Further, an intermediate magnetic bridge is formed between the two paired magnetic isolation holes. The intermediate magnetic bridge has a first end and a second end distributed along the axis away from the rotor core. The width of the first end is H, and the width of the second end is J; wherein, 0.9 ≥ H / J ≥ 0.1, and the width directions of the first end and the second end are both the distribution direction between the two paired magnetic isolation holes.

[0013] Further, the length of the first hole body part is smaller than that of the second hole body part; wherein, the length directions of the first hole body part and the second hole body part are both along the distribution direction of the first hole body part and the second hole body part.

[0014] Further, the length of the first hole body part is E, the length of the second hole body part is F, and the minimum distance between the first hole body part and the permanent magnet on one side of the corresponding magnetic pole is C; wherein, 1.5 ≥ / F ≥ 0.4, and the length directions of the first hole body part and the second hole body part are both along the distribution direction of the first hole body part and the second hole body part.

[0015] Further, the minimum distance between the first hole body part and the permanent magnet on one side of the corresponding magnetic pole is C, and the thickness of the permanent magnet is D; wherein, 1.2 ≥ C / D ≥ 0.5.

[0016] Further, both the first hole body part and the second hole body part have a first side wall and a second side wall arranged oppositely. The first side wall is located on the side of the second side wall away from the magnetic pole center line of the corresponding magnetic pole; the first side wall of the first hole body part is arranged parallel to the first side wall of the second hole body part, and the first side wall of the second hole body part is arranged parallel to the second side wall of the second hole body part.

[0017] Further, the distance between the first side wall of the first hole body part and the first side wall of the second hole body part is K, and the distance between the second side wall of the first hole body part and the second side wall of the second hole body part is L; wherein, K ≥ L.

[0018] Further, the distance between the first side wall of the first hole body portion and the first side wall of the second hole body portion is K, and the distance between the second side wall of the first hole body portion and the second side wall of the second hole body portion is L; wherein, 4 ≥ K / L ≥ 1.3.

[0019] Further, each magnetic pole includes a plurality of magnetic isolation holes, and the plurality of magnetic isolation holes are arranged in pairs; one of the two paired magnetic isolation holes coincides with the other after being translated by a predetermined distance, and the two paired magnetic isolation holes are located on both sides of the magnetic pole center line of the corresponding magnetic pole.

[0020] Further, the two paired magnetic isolation holes are respectively a first magnetic isolation hole and a second magnetic isolation hole. The side wall of the second hole body portion of the first magnetic isolation hole close to the magnetic pole center line of the corresponding magnetic pole is arranged parallel to the magnetic pole center line, and the side wall of the second hole body portion of the second magnetic isolation hole close to the magnetic pole center line of the corresponding magnetic pole is arranged parallel to the magnetic pole center line; the distance between the side wall of the second hole body portion of the first magnetic isolation hole close to the magnetic pole center line of the corresponding magnetic pole and the magnetic pole center line is O, and the distance between the side wall of the second hole body portion of the second magnetic isolation hole close to the magnetic pole center line of the corresponding magnetic pole and the magnetic pole center line is P; wherein, 0.8 ≥ O / P ≥ 0.4.

[0021] Further, each magnetic pole includes a plurality of magnetic isolation holes, and the plurality of magnetic isolation holes are arranged in pairs; the two paired magnetic isolation holes are symmetrically arranged with respect to the magnetic pole center line of the corresponding magnetic pole; along the direction away from the axis of the rotor core, the second hole body portions of the respective magnetic isolation holes are gradually closer to the magnetic pole center line of the corresponding magnetic pole.

[0022] Further, the second hole body portion of each magnetic isolation hole includes a first hole end and a second hole end arranged along the direction away from the axis of the rotor core; the distance between the first hole ends of the second hole body portions of the two paired magnetic isolation holes is R, and the distance between the second hole ends of the second hole body portions of the two paired magnetic isolation holes is Q; wherein, 0.9 ≥ Q / R ≥ 0.4.

[0023] Further, each magnetic pole includes a plurality of magnetic isolation holes, and the plurality of magnetic isolation holes are arranged in pairs; the two paired magnetic isolation holes are symmetrically arranged with respect to the magnetic pole center line of the corresponding magnetic pole; along the direction away from the axis of the rotor core, the second hole body portions of the respective magnetic isolation holes are gradually farther away from the magnetic pole center line of the corresponding magnetic pole.

[0024] Further, the second hole body portion of each magnetic isolation hole includes a first hole end and a second hole end arranged along the direction away from the axis of the rotor core; the distance between the first hole ends of the second hole body portions of the two paired magnetic isolation holes is S, and the distance between the second hole ends of the second hole body portions of the two paired magnetic isolation holes is T; wherein, 2.5 ≥ T / S ≥ 1.2.

[0025] Furthermore, each magnetic pole includes a plurality of magnetic isolation holes, and the plurality of magnetic isolation holes are arranged in pairs; the two magnetic isolation holes in a pair are respectively located on both sides of the magnetic pole center line of the corresponding magnetic pole; the two magnetic isolation holes in a pair are respectively a first magnetic isolation hole and a second magnetic isolation hole, and along the direction away from the axis of the rotor core, the second hole body of the first magnetic isolation hole is gradually arranged close to the magnetic pole center line of the corresponding magnetic pole, and the second hole body of the second magnetic isolation hole is gradually arranged away from the magnetic pole center line of the corresponding magnetic pole.

[0026] Furthermore, each magnetic pole includes a plurality of magnetic isolation holes, which are arranged in pairs; the two magnetic isolation holes in a pair are respectively located on both sides of the magnetic pole center line of the corresponding magnetic pole; and the first hole bodies of the two magnetic isolation holes in a pair are connected.

[0027] According to a second aspect of the present invention, a motor is provided, comprising a stator structure and a rotor structure, wherein the rotor structure is the above-mentioned rotor structure.

[0028] According to a third aspect of the present invention, a compressor is provided, comprising a motor, which is the motor described above.

[0029] The present invention provides a rotor structure having a rotor core, a plurality of permanent magnets and a magnetic isolation hole, wherein the plurality of permanent magnets are evenly distributed on the rotor core around the axis of the rotor core to form a plurality of magnetic poles, including N poles and S poles, and a magnetic isolation hole is provided on at least one magnetic pole. The magnetic isolation hole comprises a first hole body and a second hole body, wherein the first hole body is located on a side close to the axis of the rotor core, and the second hole body is located on a side close to the outer peripheral surface of the rotor core, and the minimum width of the first hole body is greater than the maximum width of the second hole body; the width direction of the first hole body and the second hole body is the circumferential direction of the rotor core or the direction perpendicular to the magnetic pole center line 31 of the magnetic pole 3, which makes the width of the magnetic isolation hole in the circumferential and radial directions of the rotor core have a gradient change, that is, the size of the magnetic isolation hole in the radial and circumferential directions of the rotor core has a gradient change, and at the same time, the size and shape of the magnetic isolation hole in the axial direction of the rotor core are unchanged. Through the technical solution provided by the present invention, the magnetic resistance distribution at various parts of the motor magnetic circuit is effectively improved, the direction of the magnetic flux is improved, the air gap magnetic field distribution is adjusted, the air gap magnetic density waveform is improved, the motor's cogging effect is reduced, the proportion of the motor's back-electromotive force harmonics is reduced, the motor's torque pulsation is reduced, the motor's electromagnetic force peak value is reduced, and the motor's electromagnetic vibration noise is reduced. The problem of high vibration noise of the motor in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1Shows a schematic structural diagram of a rotor structure according to a first embodiment of the present invention;

[0032] Figure 2 Shows Figure 1 A schematic diagram of the magnetic flux direction of the rotor structure shown;

[0033] Figure 3 Shows a schematic structural diagram of a rotor structure according to a second embodiment of the present invention;

[0034] Figure 4 Shows a schematic structural diagram of a rotor structure according to a third embodiment of the present invention;

[0035] Figure 5 Shows a schematic structural diagram of a rotor structure according to a fourth embodiment of the present invention;

[0036] Figure 6 Shows a schematic structural diagram of a rotor structure according to a fifth embodiment of the present invention;

[0037] Figure 7 Shows a schematic structural diagram of a rotor structure according to a sixth embodiment of the present invention;

[0038] Figure 8 Shows a comparison graph of the measured torque pulsations of an existing motor and the motor of the present application;

[0039] Figure 9 Shows a comparison graph of the measured proportion of back electromotive force harmonics of an existing motor and the motor of the present application;

[0040] Figure 10 Shows a comparison graph of the measured peak values of electromagnetic force density of an existing motor and the motor of the present application;

[0041] Figure 11 Shows a comparison graph of the total noise values of a compressor with an existing motor and a compressor with the motor of the present application; and

[0042] Figure 12 Shows a relationship graph of the measured proportion of back electromotive force harmonics of the motor of the present application varying with the value of (A + B) / C.

[0043] Among them, the above-mentioned drawings include the following reference numerals:

[0044] 1. Rotor core; 2. Permanent magnet; 3. Magnetic pole; 31. Magnetic pole center line; 4. Magnetic isolation hole; 41. First hole body part; 42. Second hole body part; 5. Intermediate magnetic bridge. Detailed implementation manners

[0045] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0046] As Figures 1 to 7 shown, the present invention provides a rotor structure, including a rotor core 1 and a plurality of permanent magnets 2 disposed on the rotor core 1 to form a plurality of magnetic poles 3 on the rotor core 1. The plurality of magnetic poles 3 include a plurality of N poles and a plurality of S poles alternately arranged along the circumferential direction of the rotor core 1; a magnetic isolation hole 4 is formed in at least one magnetic pole 3 of the rotor core 1. Along the direction away from the axis of the rotor core 1, the magnetic isolation hole 4 has a first hole body portion 41 and a second hole body portion 42; the minimum width of the first hole body portion 41 is greater than the maximum width of the second hole body portion 42; wherein, the width direction of both the first hole body portion 41 and the second hole body portion 42 is the direction perpendicular to the distribution direction of the first hole body portion 41 and the second hole body portion 42.

[0047] The present invention provides a rotor structure having a rotor core 1, a plurality of permanent magnets 2, and a magnetic isolation hole 4. Among them, the plurality of permanent magnets 2 are evenly distributed around the axis of the rotor core 1 on the rotor core 1 to form a plurality of magnetic poles 3, including N poles and S poles, and a magnetic isolation hole 4 is formed in at least one magnetic pole 3. Among them, the magnetic isolation hole 4 includes a first hole body portion 41 and a second hole body portion 42. The first hole body portion 41 is located on the side close to the axis of the rotor core 1, and the second hole body portion 42 is located on the side close to the outer peripheral surface of the rotor core 1. The minimum width of the first hole body portion 41 is greater than the maximum width of the second hole body portion 42; the width direction of the first hole body portion 41 and the second hole body portion 42 is the circumferential direction of the rotor core 1 or the direction perpendicular to the magnetic pole center line 31 of the magnetic pole 3, which makes the width of the magnetic isolation hole 4 have a gradient change in the circumferential and radial directions of the rotor core 1, that is, the dimensions of the magnetic isolation hole 4 in the radial and circumferential directions of the rotor core 1 both have gradient changes. At the same time, the size and shape of the magnetic isolation hole 4 along the axis direction of the rotor core 1 are unchanged. Through the technical solution provided by the present invention, the technical effects of effectively improving the magnetic resistance distribution at various parts of the motor magnetic circuit, improving the magnetic flux direction, adjusting the air gap magnetic field distribution, improving the air gap magnetic density waveform, reducing the cogging effect of the motor, reducing the proportion of back electromotive force harmonics of the motor, reducing the torque ripple of the motor, reducing the peak value of the electromagnetic force of the motor, and reducing the electromagnetic vibration noise of the motor are achieved, and the problem of large vibration noise of the motor in the prior art is solved.

[0048] Specifically, the rotor core 1 is made of a material with strong magnetic permeability, which results in a relatively small magnetic resistance of the rotor core 1. Optionally, the rotor core 1 is formed by stacking multiple silicon steel sheets, which makes it easy for magnetic lines of force to pass through. Since the inside of the magnetic isolation hole 4 is filled with non-magnetic materials such as air, the magnetic conduction ability is poor, the magnetic resistance is large, and it is not easy for magnetic lines of force to pass through. Therefore, by providing such a magnetic isolation hole 4, the magnetic resistance distribution at each part of the magnetic circuit of the motor rotor structure can be changed, the direction of the magnetic lines of force inside the rotor structure can be changed, the air-gap magnetic density waveform can be improved, thereby reducing the proportion of various harmonics of the back electromotive force, reducing the torque ripple of the motor, reducing the amplitude of the electromagnetic force, and reducing the electromagnetic vibration and noise of the motor.

[0049] As Figure 2 shown, it is a schematic diagram of the magnetic flux direction of the rotor structure of the embodiment provided by the present invention. The lines with arrows are the identifications of the magnetic lines of force. The solid lines with arrows indicate that there are more magnetic lines of force passing through at that position, and the dotted lines with arrows indicate that there are very few magnetic lines of force passing through at that position. It can be Figure 2 clearly seen that at the position where the magnetic isolation hole 4 is located, the magnetic lines of force pass through less. The magnetic isolation hole 4 provided by the present invention effectively improves the distribution of the magnetic lines of force of the rotor structure.

[0050] As Figures 1 to 7 shown, the first hole body part 41 and the second hole body part 42 are distributed along the radial direction of the rotor core 1; or the distribution direction of the first hole body part 41 and the second hole body part 42 is parallel to the direction of the magnetic pole center line 31 of the corresponding magnetic pole 3.

[0051] The rotor structure provided by the present invention adopts a magnetic isolation hole 4 with a "convex" shape. The magnetic isolation hole 4 has a first hole body part 41 extending in the circumferential direction of the rotor core 1, that is, the tail of the magnetic isolation hole 4, and a second hole body part 42 extending in the radial direction of the rotor, that is, the head of the magnetic isolation hole 4. The first hole body part 41 has a first end and a second end in the circumferential direction of the rotor core 1, and the second hole body part 42 has a first end and a second end in the radial direction of the rotor core 1. Among them, the first end of the second hole body part 42 is connected to the first hole body part 41 and is located between the first end and the second end of the first hole body part 41. The second end of the second hole body part 42 is close to the outer peripheral surface of the rotor core 1, and the first hole body part 41 is close to the axis of the rotor core 1. The first end and the second end of the first hole body part 41 are respectively located on both sides of the second hole body part 42 in the radial direction of the rotor, which makes the shape of the magnetic isolation hole 4 a "convex" shape that gradually becomes narrower in the direction away from the axis of the rotor core 1, and the width of the magnetic isolation hole 4 in the radial direction of the rotor core 1 has a gradient change. In this way, the magnetic flux distribution in the magnetic conduction region between the first hole body part 41 and the permanent magnet 2 and at the intermediate magnetic bridge 5 can be improved, making the magnetic conductance of each part of the magnetic circuit of the rotor structure more uniform during the operation of the motor, improving the air-gap magnetic density waveform, reducing the torque ripple of the motor, reducing the proportion of various harmonics of the back electromotive force of the motor, and reducing the peak value of the electromagnetic force and the electromagnetic vibration noise of the motor.

[0052] As Figure 1 shown, the maximum width of the first hole body part 41 is A, the maximum width of the second hole body part 42 is B, and the minimum distance between the first hole body part 41 and the permanent magnet 2 on one side of the corresponding magnetic pole 3 is C; among them, 10≥(A + C) / B≥2.

[0053] The maximum width A of the first hole body part 41 is the width in the circumferential direction of the rotor core 1; the maximum width B of the second hole body part 42 is the width in the circumferential direction of the rotor core 1.

[0054] Since the rotor core 1 is mostly stacked by silicon steel sheets and has good magnetic conductivity, the magnetic flux is transmitted along the magnetic path provided by the rotor magnetic pole 3. The inside of the magnetic isolation hole 4 is air or other non-magnetic substances, and the magnetic isolation hole 4 has a certain gradient change in the radial direction of the rotor core 1. The maximum width A of the first hole body part 41 is relatively large, so that the side of the magnetic isolation hole 4 close to the axis of the rotor core 1 is closer to the permanent magnet 2, and the maximum width B of the second hole body part 42 is relatively small, so that the side of the magnetic isolation hole 4 close to the outer peripheral surface of the rotor core 1 is closer to the magnetic pole center line 31. In this way, the magnetic isolation hole 4 changes the magnetic flux direction generated by the permanent magnet 2.

[0055] When the value of (A + C) / B is set within the range of 2 to 10, the magnetic flux direction generated by the permanent magnet 2 can be effectively changed, making the permeance of the magnetic circuits more uniform at various circumferential and radial positions of the magnetic pole 3 on the rotor core 1, better improving the air-gap magnetic field, reducing the harmonics of the air-gap magnetic density, reducing the proportion of the back-EMF harmonics of the motor, and reducing the peak value of the electromagnetic force of the motor and the electromagnetic vibration noise of the motor.

[0056] As Figure 12 shown, it is a relationship diagram of the proportion of the back-EMF harmonics of the motor with the magnetic isolation holes 4 of the present application changing with the value of (A + B) / C of the magnetic isolation holes 4. It can be clearly seen in Figure 12 that when the value of (A + B) / C is within the range of 2 to 10, the proportion of the back-EMF harmonics of the motor is significantly smaller.

[0057] As Figure 1 shown, the minimum distance between the first hole body part 41 and the permanent magnet 2 on one side of the corresponding magnetic pole 3 is C, and the remanence of the permanent magnet 2 is Br; among them, 9 ≥ C / Br ≥ 1.

[0058] The minimum distance C between the first hole body part 41 and the permanent magnet 2 on one side of the corresponding magnetic pole 3 is the minimum distance between the side of the magnetic isolation hole 4 close to the axis of the rotor core 1 and the permanent magnet 2 close to the magnetic isolation hole 4. The remanence of the permanent magnet 2 (i.e., the residual magnetization intensity, the magnetism retained by the magnetic material after the external magnetic field is eliminated) is Br. When the value of C / Br is set within the range of 1 to 9, the magnetic flux distribution generated by the permanent magnet 2 of different grades of materials can be improved, thereby reducing the vibration and noise of the motor.

[0059] As Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, each magnetic pole 3 includes a plurality of magnetic isolation holes 4, and the plurality of magnetic isolation holes 4 are arranged in pairs; taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projections of the two paired magnetic isolation holes 4 on the predetermined plane are symmetrically arranged with respect to the magnetic pole center line 31 of the corresponding magnetic pole 3.

[0060] Specifically, an intermediate magnetic bridge 5 is formed between the two paired magnetic isolation holes 4. The intermediate magnetic bridge 5 has a first end and a second end distributed along the direction away from the axis of the rotor core 1, and the width of the first end is smaller than that of the second end; among them, the width directions of the first end and the second end are both the distribution directions between the two paired magnetic isolation holes 4.

[0061] Preferably, the magnetic isolation holes 4 are located on one side of the magnetic pole center line 31 of the same magnetic pole 3. Each magnetic pole 3 has two magnetic isolation holes 4, and the two magnetic isolation holes 4 are symmetrically arranged with respect to the magnetic pole center line 31. An intermediate magnetic bridge 5 is formed between the two magnetic isolation holes 4. The width of the side of the intermediate magnetic bridge 5 close to the axis of the rotor core 1 is smaller than the width of the side of the intermediate magnetic bridge 5 close to the outer peripheral surface of the rotor core 1. In this way, while improving the air-gap magnetic field of the motor, the torque ripple of the motor is further reduced, and the vibration and noise of the motor are reduced.

[0062] As Figure 1 shown, an intermediate magnetic bridge 5 is formed between a pair of two magnetic isolation holes 4. The intermediate magnetic bridge 5 has a first end and a second end distributed along the axis away from the rotor core 1. The width of the first end is H, and the width of the second end is J; wherein, 0.9≥H / J≥0.1, and the width directions of the first end and the second end are both the distribution directions between the pair of two magnetic isolation holes 4.

[0063] The intermediate magnetic bridge 5 extends along the radial direction of the rotor core 1. The first end of the intermediate magnetic bridge 5 is located on the side of the intermediate magnetic bridge 5 close to the axis of the rotor core 1, and the second end of the intermediate magnetic bridge 5 is located on the side of the intermediate magnetic bridge 5 close to the outer peripheral surface of the rotor core 1.

[0064] When the value of H / J is set within the range of 0.1 to 0.9, the magnetic conductance distribution at the position of the magnetic pole center line 31 of the magnetic pole 3 and the magnetic conductance distribution at the positions on both sides of the magnetic pole 3 close to the two permanent magnets 2 can be effectively improved, so as to improve the sinusoidality of the air-gap magnetic field waveform, thereby reducing the peak value of the electromagnetic force of the motor and reducing the electromagnetic vibration and noise of the motor.

[0065] As Figure 1 shown, the length of the first hole body part 41 is less than the length of the second hole body part 42; wherein, the length directions of the first hole body part 41 and the second hole body part 42 are both along the distribution directions of the first hole body part 41 and the second hole body part 42.

[0066] The length of the magnetic isolation hole 4 has a gradient change in the radial direction of the rotor. The length of the inner side (i.e., the first hole body part 41) of the magnetic isolation hole 4 in the radial direction of the rotor is shorter, and the length of the outer side (i.e., the second hole body part 42) of the magnetic isolation hole 4 in the radial direction of the rotor is longer. The inner side of the magnetic isolation hole 4 is close to the permanent magnet 2, and the shorter inner side will not weaken the effective magnetic flux of the permanent magnet 2, which can ensure the output torque of the motor and the efficiency of the motor. The outer side of the magnetic isolation hole 4 is close to the outer peripheral surface of the rotor core 1, and the shorter outer side is more conducive to adjusting the air-gap magnetic density waveform.

[0067] As Figure 1As shown, the length of the first hole body part 41 is E, the length of the second hole body part 42 is F, and the minimum distance between the first hole body part 41 and the permanent magnet 2 on one side of the corresponding magnetic pole 3 is C; wherein, 1.5 ≥ (C + E) / F ≥ 0.4, and the length directions of the first hole body part 41 and the second hole body part 42 are both along the distribution direction of the first hole body part 41 and the second hole body part 42.

[0068] The inner side (i.e., the first hole body part 41) of the magnetic isolation hole 4 has a length of E, the outer side (i.e., the second hole body part 42) of the magnetic isolation hole 4 has a length of F, the inner side of the magnetic isolation hole 4 is close to the permanent magnet, and the minimum distance between the inner side of the magnetic isolation hole 4 and the permanent magnet is C. When the value of (C + E) / F is set within the range of 0.4 to 1.5, it is possible to effectively reduce the distortion rate of the air-gap magnetic field waveform in the air-gap circumference while ensuring the transmission of the magnetic energy of the motor, so as to reduce the harmonic loss, improve the motor efficiency, and at the same time reduce the peak value of the electromagnetic force of the motor and the vibration noise of the motor.

[0069] As Figure 1 shown, the minimum distance between the first hole body part 41 and the permanent magnet 2 on one side of the corresponding magnetic pole 3 is C, and the thickness of the permanent magnet 2 is D; wherein, 1.2 ≥ C / D ≥ 0.5.

[0070] Specifically, the minimum distance between the inner side (i.e., the first hole body part 41) of the magnetic isolation hole 4 and the permanent magnet 2 close to the magnetic isolation hole 4 is C, the thickness of the permanent magnet 2 is D, and the distance between the inner side of the magnetic isolation hole 4 and the permanent magnet 2 affects the output of the magnetic flux of the permanent magnet 2. When the value of C / D is set within the range of 0.5 to 1.2, it is possible to ensure the output of the permanent magnet torque of the motor while ensuring the working efficiency of the motor.

[0071] As Figure 1 shown, both the first hole body part 41 and the second hole body part 42 have a first side wall and a second side wall arranged oppositely, and the first side wall is located on the side of the second side wall away from the magnetic pole center line 31 of the corresponding magnetic pole 3; the first side wall of the first hole body part 41 is arranged parallel to the first side wall of the second hole body part 42, and the first side wall of the second hole body part 42 is arranged parallel to the second side wall of the second hole body part 42.

[0072] In Figures 1 to 7 it, the first side walls of the first hole body part 41 and the second hole body part 42 are located on the side of the magnetic isolation hole 4 close to the permanent magnet 2, the second side walls of the first hole body part 41 and the second hole body part 42 are located on the side of the magnetic isolation hole 4 close to the magnetic pole center line 31, the first side wall and the second side wall of the first hole body part 41 are parallel to each other, and the first side wall and the second side wall of the second hole body part 42 are parallel to each other.

[0073] In Figures 1 to 3 it, the first side wall and the second side wall of the first hole body part 41 and the first side wall and the second side wall of the second hole body part 42 are all parallel to each other.

[0074] As Figure 1 shown, the distance between the first side wall of the first hole body portion 41 and the first side wall of the second hole body portion 42 is K, and the distance between the second side wall of the first hole body portion 41 and the second side wall of the second hole body portion 42 is L; wherein, K≥L.

[0075] Preferably, as Figure 1 shown, the distance between the first side wall of the first hole body portion 41 and the first side wall of the second hole body portion 42 is K, and the distance between the second side wall of the first hole body portion 41 and the second side wall of the second hole body portion 42 is L; wherein, 4≥K / L≥1.3.

[0076] The distance K between the first side wall of the first hole body portion 41 and the first side wall of the second hole body portion 42 is the distance between the head of the magnetic isolation hole 4 and the left side of the tail of the magnetic isolation hole 4; the distance L between the second side wall of the first hole body portion 41 and the second side wall of the second hole body portion 42 is the distance between the head of the magnetic isolation hole 4 and the right side of the tail of the magnetic isolation hole 4.

[0077] The distances on the left and right sides between the head (i.e., the second hole body portion 42) and the tail (i.e., the first hole body portion 41) of the magnetic isolation hole 4 are not equal, with the left side being longer and the right side being shorter. When the value of K / L is set within the range of 1.3 to 4, it can effectively change the magnetic conductance distribution of the magnetic circuit in the circumferential direction of the rotor core 1, making the magnetic conductance of the entire magnetic circuit more uniform during the operation of the motor, further improving the magnetic field at the air gap, increasing the sinusoidality of the back electromotive force waveform of the motor, and reducing the peak value of the electromagnetic force density and the vibration noise of the motor.

[0078] As Figure 3 shown, each magnetic pole 3 includes a plurality of magnetic isolation holes 4, and the plurality of magnetic isolation holes 4 are arranged in pairs; one of the two magnetic isolation holes 4 in a pair coincides with the other magnetic isolation hole 4 after being translated a predetermined distance, and the two magnetic isolation holes 4 in a pair are located on both sides of the magnetic pole center line 31 of the corresponding magnetic pole 3.

[0079] As Figure 3 shown, the two magnetic isolation holes 4 in a pair are respectively a first magnetic isolation hole and a second magnetic isolation hole. The side wall of the second hole body portion 42 of the first magnetic isolation hole close to the magnetic pole center line 31 of the corresponding magnetic pole 3 is arranged parallel to the magnetic pole center line 31, and the side wall of the second hole body portion 42 of the second magnetic isolation hole close to the magnetic pole center line 31 of the corresponding magnetic pole 3 is arranged parallel to the magnetic pole center line 31; the distance between the side wall of the second hole body portion 42 of the first magnetic isolation hole close to the magnetic pole center line 31 of the corresponding magnetic pole 3 and the magnetic pole center line 31 is O, and the distance between the side wall of the second hole body portion 42 of the second magnetic isolation hole close to the magnetic pole center line 31 of the corresponding magnetic pole 3 and the magnetic pole center line 31 is P; wherein, 0.8≥O / P≥0.4.

[0080] Specifically, the lengths of the first hole body parts 41 of the magnetic isolation holes 4 with a "convex" shape on both the left and right sides of the magnetic pole center line 31 are not equal on both sides of the second hole body part 42 (that is, the first hole body part 41 is not symmetric about the left and right of the second hole body part 42). Both the first magnetic isolation hole and the second magnetic isolation hole have a structure with a longer left side and a shorter right side. The length of the end of the first hole body part 41 of the first magnetic isolation hole close to the magnetic pole center line 31 is shorter than the length close to the permanent magnet end. The length of the end of the first hole body part 41 of the second magnetic isolation hole close to the magnetic pole center line 31 is longer than the length close to the permanent magnet end.

[0081] The first magnetic isolation hole is located on the left side of the magnetic pole center line 31, and the second magnetic isolation hole is located on the right side of the magnetic pole center line 31. An intermediate magnetic bridge 5 is formed between the first magnetic isolation hole and the second magnetic isolation hole. The widths of the intermediate magnetic bridge 5 on both the left and right sides of the magnetic pole center line 31 are not equal. The width of the intermediate magnetic bridge 5 on the left side of the magnetic pole center line 31 is O, and the width of the intermediate magnetic bridge 5 on the right side of the magnetic pole center line 31 is P. When the value of O / P is set within the range of 0.4 to 0.8, it can make the magnetic conductance distribution of the entire magnetic circuit more uniform during the operation of the motor, further improve the magnetic field at the air gap, increase the sinusoidality of the back electromotive force waveform of the motor, and reduce the peak value of the electromagnetic force and the vibration noise of the motor.

[0082] Preferably, as Figure 4 shown, each magnetic pole 3 includes a plurality of magnetic isolation holes 4, and the plurality of magnetic isolation holes 4 are arranged in pairs; the two magnetic isolation holes in a pair are symmetrically arranged with respect to the magnetic pole center line 31 of the corresponding magnetic pole 3; along the direction away from the axis of the rotor core 1, the second hole body parts 42 of the respective magnetic isolation holes 4 are gradually arranged closer to the magnetic pole center line 31 of the corresponding magnetic pole 3.

[0083] On the same magnetic pole 3, the heads (that is, the second hole body parts 42) of the two magnetic isolation holes symmetric about the magnetic pole center line 31 are inclined with respect to the magnetic pole center line 31, and the outer side of its head (that is, the end of the second hole body part 42 close to the outer peripheral surface of the rotor core 1) is closer to the magnetic pole center line 31 than the inner side (that is, the end of the second hole body part 42 close to the axis of the rotor core 1). This makes the change in the width from the inner side of the intermediate magnetic bridge 5 (that is, the end of the intermediate magnetic bridge 5 close to the axis of the rotor core 1) to the outer side (that is, the end of the intermediate magnetic bridge 5 close to the outer peripheral surface of the rotor core 1) (that is, its dimension in the circumferential direction of the rotor core 1) be "narrow-wide-narrow". In this way, the magnetic flux direction is effectively changed, the magnetic field waveform at the air gap of the motor is changed, and thus the peak value of the electromagnetic force and the vibration noise of the motor are reduced.

[0084] Specifically, as Figure 4As shown, the second hole body parts 42 of the respective magnetic isolation holes 4 each include a first hole end and a second hole end arranged along a direction away from the axis of the rotor core 1; the distance between the first hole ends of the second hole body parts 42 of two paired magnetic isolation holes 4 is R, and the distance between the second hole ends of the second hole body parts 42 of two paired magnetic isolation holes 4 is Q; wherein, 0.9 ≥ Q / R ≥ 0.4.

[0085] On the same magnetic pole 3, the distance between the outer sides of the heads of two magnetic isolation holes 4 (i.e., the second hole ends of the second hole body parts 42 close to the outer peripheral surface of the rotor core 1) is Q, and the distance between the inner sides of the heads of the magnetic isolation holes (i.e., the first hole ends of the second hole body parts 42 close to the axis of the rotor core 1) is R. By arranging the width of the intermediate magnetic bridge 5 in the circumferential direction of the rotor core 1 to vary in the radial direction of the rotor core 1, the density and direction of the magnetic flux lines passing through the magnetic pole center line 31 are changed. When the value of Q / R is set within the range of 0.4 to 0.9, while ensuring the output torque of the motor, the air-gap magnetic density distribution can be effectively improved to reduce the peak value of the electromagnetic force density of the motor and the vibration noise of the motor.

[0086] Preferably, as Figure 5 shown, each magnetic pole 3 includes a plurality of magnetic isolation holes 4, and the plurality of magnetic isolation holes 4 are arranged in pairs; two paired magnetic isolation holes 4 are symmetrically arranged with respect to the magnetic pole center line 31 of the corresponding magnetic pole 3; along the direction away from the axis of the rotor core 1, the second hole body parts 42 of the respective magnetic isolation holes 4 are gradually arranged away from the magnetic pole center line 31 of the corresponding magnetic pole 3.

[0087] The head of the magnetic isolation hole 4 (i.e., the second hole body part 42) is inclined with respect to the magnetic pole center line 31, and its inner side of the head (i.e., one end of the second hole body part 42 close to the axis of the rotor core 1) is closer to the magnetic pole center line 31 than the outer side of the head (the end of the second hole body part 42 close to the outer peripheral surface of the rotor core 1), so that the change in the width dimension of the intermediate magnetic bridge 5 in the direction away from the axis of the rotor core 1 is "narrow-wide-wider". In this way, the magnetic flux direction of the rotor core 1 can be effectively improved, the magnetic conductance ratio of the motor in the circumferential and radial directions of the rotor core 1 can be improved, so as to reduce the proportion of the back electromotive force harmonics of the motor and reduce the vibration noise of the motor.

[0088] Specifically, as Figure 5 shown, the second hole body parts 42 of the respective magnetic isolation holes 4 each include a first hole end and a second hole end arranged along a direction away from the axis of the rotor core 1; the distance between the first hole ends of the second hole body parts 42 of two paired magnetic isolation holes 4 is S, and the distance between the second hole ends of the second hole body parts 42 of two paired magnetic isolation holes 4 is T; wherein, 2.5 ≥ T / S ≥ 1.2.

[0089] The inner and outer sides of the head of the magnetic isolation hole 4 are the first hole end and the second hole end of the second hole body part 42. The first hole end is the end of the second hole body part 42 close to the axis of the rotor core 1, and the second hole end is the end of the second hole body part 42 close to the outer peripheral surface of the rotor core 1. When the value of T / S is set within the range of 1.2 to 2.5, the proportion of the back electromotive force harmonics of the motor is the lowest value, and the vibration noise of the motor is also the lowest value.

[0090] Preferably, as Figure 6 shown, each magnetic pole 3 includes a plurality of magnetic isolation holes 4, and the plurality of magnetic isolation holes 4 are arranged in pairs; the two magnetic isolation holes 4 in a pair are respectively located on both sides of the magnetic pole center line 31 of the corresponding magnetic pole 3; the two magnetic isolation holes 4 in a pair are respectively a first magnetic isolation hole and a second magnetic isolation hole. Along the direction away from the axis of the rotor core 1, the second hole body part 42 of the first magnetic isolation hole gradually approaches the magnetic pole center line 31 of the corresponding magnetic pole 3, and the second hole body part 42 of the second magnetic isolation hole gradually moves away from the magnetic pole center line 31 of the corresponding magnetic pole 3.

[0091] Specifically, on each magnetic pole 3, the second hole body parts 42 of these two magnetic isolation holes 4 are parallel to each other, and these two second hole body parts 42 are both inclined with respect to the magnetic pole center line 31. Along the direction away from the axis of the rotor core 1, the head of the magnetic isolation hole 4 on one side of the magnetic pole center line 31 of the magnetic pole 3 (i.e., the second hole body part 42 of the first magnetic isolation hole) gradually approaches the magnetic pole center line 31, and the head of the magnetic isolation hole 4 on the other side of the magnetic pole center line 31 (i.e., the second hole body part 42 of the second magnetic isolation hole) gradually moves away from the magnetic pole center line 31. In this way, the magnetic flux direction of the rotor core 1 can be improved, thereby reducing the proportion of the back electromotive force harmonics of the motor, reducing the peak value of the electromagnetic force of the motor, and reducing the vibration noise of the motor.

[0092] Preferably, as Figure 7 shown, each magnetic pole 3 includes a plurality of magnetic isolation holes 4, and the plurality of magnetic isolation holes 4 are arranged in pairs; the two magnetic isolation holes 4 in a pair are respectively located on both sides of the magnetic pole center line 31 of the corresponding magnetic pole 3; the first hole body parts 41 of the two magnetic isolation holes 4 in a pair are communicated.

[0093] The first hole body parts 41 of two symmetric magnetic isolation holes 4 located on both sides of the magnetic pole center line 31 of the same magnetic pole 3 are connected and communicated. In this way, the magnetic resistance at the position of the magnetic pole center line 31 of the magnetic pole 3 is increased, the magnetic flux direction is improved, the air-gap magnetic density waveform is improved, and thus the vibration noise of the motor is reduced.

[0094] The present invention also provides a motor, including a stator structure and a rotor structure, and the rotor structure is the above-mentioned rotor structure. In this way, the vibration noise of the motor can be reduced.

[0095] The present invention also provides a compressor, including a motor, and the motor is the above-mentioned motor. In this way, the vibration noise of the compressor can be reduced.

[0096] As Figure 8 shown, it is a comparison chart of the torque ripple of the existing motor and the motor of the present application measured. It can be clearly seen in Figure 8 that the range of the torque ripple of the motor of the present application is much smaller than that of the existing motor.

[0097] As Figure 9 shown, it is a comparison chart of the proportion of back electromotive force harmonics of the existing motor and the motor of the present application measured. It can be clearly seen in Figure 9 that the proportion of back electromotive force harmonics of the motor of the present application is much smaller than that of the existing motor.

[0098] As Figure 10 shown, it is a comparison chart of the peak value of electromagnetic force density of the existing motor and the motor of the present application measured. It can be clearly seen in Figure 10 that the peak value of electromagnetic force density of the motor of the present application is much smaller than that of the existing motor.

[0099] As Figure 11 shown, it is a comparison chart of the total noise value of the compressor with the existing motor and the compressor with the motor of the present application measured. It can be clearly seen in Figure 11 that the total noise value of the compressor with the motor of the present application is much smaller than that of the compressor with the existing motor.

[0100] The rotor structure in the present invention includes a rotor core 1 and a permanent magnet 2. The permanent magnet 2 is arranged in the permanent magnet slot of the rotor core 1. The permanent magnets 2 on the rotor form alternating N poles and S poles. A magnetic isolation hole 4 is provided on the magnetic pole 3 of the rotor core 1. The magnetic isolation hole 4 has a first hole body part 41 extending along the circumferential direction of the rotor core 1 and a second hole body part 42 extending along the radial direction of the rotor core 1. Among them, the first hole body part 41 is located on the side close to the axis of the rotor core 1. One end of the second hole body part 42 is connected to the first hole body part 41, and the other end of the second hole body part 42 extends towards the direction close to the outer peripheral surface of the rotor core 1. This makes the width of the magnetic isolation hole 4 have a gradient change along the circumferential and radial directions of the rotor core 1. Along the radial direction of the rotor core 1, the side of the magnetic isolation hole 4 close to the axis of the rotor core 1 is wider, while the side of the magnetic isolation hole 4 close to the outer peripheral surface of the rotor core 1 is narrower, resembling a "convex"-shaped structure.

[0101] Permanent magnet motors generate the main magnetic field by permanent magnets 2. Permanent magnet motors have a high air-gap magnetic flux density, high working efficiency, small volume, high power density, simple structure, and high reliability, and are widely used in various industries. However, in permanent magnet synchronous motors, for the permanent magnets 2 made of materials of a fixed grade, the magnetic energy product remains unchanged, and it is difficult to adjust the air-gap magnetic field of the motor. At the same time, the tooth-slot structure of the motor makes the harmonic content of the air-gap magnetic flux density and back electromotive force relatively large, and the peak value of the electromagnetic force of the motor is large, resulting in relatively large torque ripple and vibration noise of the motor.

[0102] By providing magnetic isolation holes 4 with a "convex" structure on the rotor core 1, the present invention changes the magnetic resistance distribution of the magnetic circuits at various parts of the motor, realizes reducing the cogging effect of the motor, reducing the torque ripple of the motor, improving the air-gap magnetic flux density waveform, and at the same time reducing the proportion of back electromotive force harmonics, reducing the peak value of the electromagnetic force of the motor, and reducing the electromagnetic vibration noise of the motor, and solves the problems of high distortion rate of the air-gap magnetic flux density and back electromotive force waveform, large proportion of various back electromotive force harmonics, large torque ripple of the motor, large electromagnetic force of the motor, and large vibration and noise of the motor in permanent magnet synchronous motors.

[0103] The present invention provides a rotor structure having a rotor core 1, a plurality of permanent magnets 2, and magnetic isolation holes 4. Among them, the plurality of permanent magnets 2 are evenly distributed around the axis of the rotor core 1 on the rotor core 1 to form a plurality of magnetic poles 3, including N poles and S poles, and at least one magnetic pole 3 is provided with a magnetic isolation hole 4. Among them, the magnetic isolation hole 4 includes a first hole body part 41 and a second hole body part 42. The first hole body part 41 is located on the side close to the axis of the rotor core 1, and the second hole body part 42 is located on the side close to the outer peripheral surface of the rotor core 1. The minimum width of the first hole body part 41 is greater than the maximum width of the second hole body part 42; the width direction of the first hole body part 41 and the second hole body part 42 is the circumferential direction of the rotor core 1 or the direction perpendicular to the magnetic pole center line 31 of the magnetic pole 3, which makes the width of the magnetic isolation hole 4 have a gradient change in the circumferential and radial directions of the rotor core 1, that is, the dimensions of the magnetic isolation hole 4 in the radial and circumferential directions of the rotor core 1 both have gradient changes. At the same time, the size and shape of the magnetic isolation hole 4 in the axial direction of the rotor core 1 are unchanged. Through the technical solution provided by the present invention, the technical effects of effectively improving the magnetic resistance distribution at various parts of the motor magnetic circuit, improving the magnetic flux direction, adjusting the air-gap magnetic field distribution, improving the air-gap magnetic flux density waveform, reducing the cogging effect of the motor, reducing the proportion of back electromotive force harmonics of the motor, reducing the torque ripple of the motor, reducing the peak value of the electromagnetic force of the motor, and reducing the electromagnetic vibration noise of the motor are realized, and the problem of relatively large vibration and noise of the motor in the prior art is solved.

[0104] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rotor structure, comprising a rotor core (1) and a plurality of permanent magnets (2) arranged on the rotor core (1) to form a plurality of magnetic poles (3) on the rotor core (1), the plurality of magnetic poles (3) including a plurality of N poles and a plurality of S poles alternately arranged along the circumferential direction of the rotor core (1); characterized in that, at least one of the magnetic poles (3) of the rotor core (1) is provided with a magnetic isolation hole (4), and along the direction away from the axis of the rotor core (1), the magnetic isolation hole (4) has a first hole body part (41) and a second hole body part (42); the minimum width of the first hole body part (41) is greater than the maximum width of the second hole body part (42); wherein, the width directions of the first hole body part (41) and the second hole body part (42) are both perpendicular to the distribution direction of the first hole body part (41) and the second hole body part (42); the maximum width of the first hole body part (41) is A, the maximum width of the second hole body part (42) is B, and the minimum distance between the first hole body part (41) and the permanent magnet (2) on one side of the corresponding magnetic pole (3) is C; wherein, 10≥(A + C) / B≥2.

2. The rotor structure according to claim 1, characterized in that, the first hole body part (41) and the second hole body part (42) are distributed along the radial direction of the rotor core (1); or the distribution direction of the first hole body part (41) and the second hole body part (42) is distributed in a direction parallel to the magnetic pole center line (31) of the corresponding magnetic pole (3).

3. The rotor structure according to claim 1, characterized in that, The remanence of the permanent magnet (2) is Br; wherein, 9≥C / Br≥1.

4. The rotor structure according to claim 1, wherein Each of the magnetic poles (3) includes a plurality of the magnetic isolation holes (4), and the plurality of magnetic isolation holes (4) are arranged in pairs; taking the plane perpendicular to the axis of the rotor core (1) as a predetermined plane, the projections of the two magnetic isolation holes (4) in the pair on the predetermined plane are symmetrically arranged with respect to the magnetic pole center line (31) of the corresponding magnetic pole (3).

5. The rotor structure according to claim 4, characterized in that, An intermediate magnetic bridge (5) is formed between the two magnetic isolation holes (4) in the pair, and the intermediate magnetic bridge (5) has a first end and a second end distributed along the direction away from the axis of the rotor core (1), and the width of the first end is smaller than that of the second end; wherein, the width directions of the first end and the second end are both the distribution direction between the two magnetic isolation holes (4) in the pair.

6. The rotor structure according to claim 4, characterized in that, An intermediate magnetic bridge (5) is formed between the two magnetic isolation holes (4) in the pair, and the intermediate magnetic bridge (5) has a first end and a second end distributed along the direction away from the axis of the rotor core (1), the width of the first end is H, and the width of the second end is J; wherein, 0.9≥H / J≥0.1, and the width directions of the first end and the second end are both the distribution direction between the two magnetic isolation holes (4) in the pair.

7. The rotor structure according to claim 1, characterized in that, The length of the first hole body portion (41) is less than the length of the second hole body portion (42); wherein, the length directions of the first hole body portion (41) and the second hole body portion (42) are both along the distribution direction of the first hole body portion (41) and the second hole body portion (42).

8. The rotor structure according to claim 1, characterized in that, The length of the first hole body portion (41) is E, and the length of the second hole body portion (42) is F; wherein, 1.5 ≥ (C + E) / F ≥ 0.4, and the length directions of the first hole body portion (41) and the second hole body portion (42) are both along the distribution direction of the first hole body portion (41) and the second hole body portion (42).

9. The rotor structure according to claim 1, characterized in that The thickness of the permanent magnet (2) is D; wherein, 1.2 ≥ C / D ≥ 0.

5.

10. The rotor structure according to claim 1, characterized in that, Both the first hole body portion (41) and the second hole body portion (42) have a first side wall and a second side wall which are oppositely arranged, and the first side wall is located on one side of the second side wall away from the magnetic pole center line (31) of the corresponding magnetic pole (3); the first side wall of the first hole body portion (41) is arranged in parallel with the first side wall of the second hole body portion (42), and the first side wall of the second hole body portion (42) is arranged in parallel with the second side wall of the second hole body portion (42).

11. The rotor structure according to claim 10, characterized in that, The distance between the first side wall of the first hole body portion (41) and the first side wall of the second hole body portion (42) is K, and the distance between the second side wall of the first hole body portion (41) and the second side wall of the second hole body portion (42) is L; wherein, K ≥ L.

12. The rotor structure according to claim 10, wherein, The distance between the first side wall of the first hole body portion (41) and the first side wall of the second hole body portion (42) is K, and the distance between the second side wall of the first hole body portion (41) and the second side wall of the second hole body portion (42) is L; wherein, 4 ≥ K / L ≥ 1.

3.

13. The rotor structure according to claim 1, characterized in that, Each of the magnetic poles (3) includes a plurality of the magnetic isolation holes (4), and the plurality of the magnetic isolation holes (4) are arranged in pairs; one of the two magnetic isolation holes (4) in a pair coincides with the other magnetic isolation hole (4) after being translated a predetermined distance, and the two magnetic isolation holes (4) in a pair are located on both sides of the magnetic pole center line (31) of the corresponding magnetic pole (3).

14. The rotor structure according to claim 13, wherein The two magnetic isolation holes (4) in a pair are respectively a first magnetic isolation hole and a second magnetic isolation hole. The side wall of the second hole body portion (42) of the first magnetic isolation hole close to the magnetic pole center line (31) of the corresponding magnetic pole (3) is arranged in parallel with the magnetic pole center line (31), and the side wall of the second hole body portion (42) of the second magnetic isolation hole close to the magnetic pole center line (31) of the corresponding magnetic pole (3) is arranged in parallel with the magnetic pole center line (31); The distance between the side wall of the second hole body part (42) of the first magnetic isolation hole close to the magnetic pole center line (31) of the corresponding magnetic pole (3) and the magnetic pole center line (31) is O, and the distance between the side wall of the second hole body part (42) of the second magnetic isolation hole close to the magnetic pole center line (31) of the corresponding magnetic pole (3) and the magnetic pole center line (31) is P; wherein, 0.8 ≥ O / P ≥ 0.

4.

15. The rotor structure according to claim 1, characterized in that Each of the magnetic poles (3) includes a plurality of the magnetic isolation holes (4), and the plurality of the magnetic isolation holes (4) are arranged in pairs; the two magnetic isolation holes (4) in a pair are symmetrically arranged with respect to the magnetic pole center line (31) of the corresponding magnetic pole (3); along the direction away from the axis of the rotor core (1), the second hole body parts (42) of the respective magnetic isolation holes (4) are gradually arranged closer to the magnetic pole center line (31) of the corresponding magnetic pole (3).

16. The rotor structure according to claim 15, wherein The second hole body part (42) of each of the magnetic isolation holes (4) includes a first hole end and a second hole end arranged along the direction away from the axis of the rotor core (1); the distance between the first hole ends of the second hole body parts (42) of the two magnetic isolation holes (4) in a pair is R, and the distance between the second hole ends of the second hole body parts (42) of the two magnetic isolation holes (4) in a pair is Q; wherein, 0.9 ≥ Q / R ≥ 0.

4.

17. The rotor structure according to claim 1, wherein Each of the magnetic poles (3) includes a plurality of the magnetic isolation holes (4), and the plurality of the magnetic isolation holes (4) are arranged in pairs; the two magnetic isolation holes (4) in a pair are symmetrically arranged with respect to the magnetic pole center line (31) of the corresponding magnetic pole (3); along the direction away from the axis of the rotor core (1), the second hole body parts (42) of the respective magnetic isolation holes (4) are gradually arranged farther away from the magnetic pole center line (31) of the corresponding magnetic pole (3).

18. The rotor structure according to claim 17, wherein, The second hole body part (42) of each of the magnetic isolation holes (4) includes a first hole end and a second hole end arranged along the direction away from the axis of the rotor core (1); the distance between the first hole ends of the second hole body parts (42) of the two magnetic isolation holes (4) in a pair is S, and the distance between the second hole ends of the second hole body parts (42) of the two magnetic isolation holes (4) in a pair is T; wherein, 2.5 ≥ T / S ≥ 1.

2.

19. The rotor structure according to claim 1, wherein Each of the magnetic poles (3) includes a plurality of the magnetic isolation holes (4), and the plurality of the magnetic isolation holes (4) are arranged in pairs; the two magnetic isolation holes (4) in a pair are respectively located on both sides of the magnetic pole center line (31) of the corresponding magnetic pole (3); the two magnetic isolation holes (4) in a pair are respectively a first magnetic isolation hole and a second magnetic isolation hole, along the direction away from the axis of the rotor core (1), the second hole body part (42) of the first magnetic isolation hole is gradually arranged closer to the magnetic pole center line (31) of the corresponding magnetic pole (3), and the second hole body part (42) of the second magnetic isolation hole is gradually arranged farther away from the magnetic pole center line (31) of the corresponding magnetic pole (3).

20. The rotor structure according to claim 1, characterized in that, Each of the magnetic poles (3) includes a plurality of the magnetic isolation holes (4), and the plurality of the magnetic isolation holes (4) are arranged in pairs; two of the magnetic isolation holes (4) in a pair are respectively located on both sides of the magnetic pole center line (31) of the corresponding magnetic pole (3); the first hole body parts (41) of the two magnetic isolation holes (4) in a pair are communicated with each other.

21. A motor, comprising a stator structure and a rotor structure, characterized in that, The rotor structure is the rotor structure according to any one of claims 1 to 20.

22. A compressor, comprising a motor, characterized in that, The motor is the motor according to claim 21.

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