Rotor structure, motor and compressor

Abstract

The main object of the present invention is to provide 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, and the magnetic isolation hole includes a first hole body portion, a second hole body portion and a third hole body portion that communicate with each other. The second hole body portion and the third hole body portion are respectively arranged at both ends of the first hole body portion along the direction away from the axis of the rotor core. Among them, along the circumferential direction of the rotor core, both the second hole body portion and the third hole body portion protrude from the first 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 rely on permanent magnets to generate the main magnetic field. Compared with ordinary induction motors, permanent magnet synchronous motors do not require reactive excitation current, and the rotor resistance loss is zero under synchronous operation. Therefore, it has the characteristics of high power factor and high efficiency, and can usually be used to replace induction motors with lower energy indexes. Its economic and social benefits are very significant and it is widely used in various industries.

[0004] However, for the permanent magnet material of a permanent magnet synchronous motor, the magnetic energy product of a permanent magnet with a fixed grade and material remains unchanged, making it difficult to adjust the air-gap magnetic field of the motor. At the same time, the tooth-slot structure of the motor results in a large harmonic content in the air-gap magnetic density and back electromotive force, and a large peak value of the electromagnetic force density of the motor, resulting in 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 large vibration noise of the motor 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, and the magnetic isolation hole includes a first hole body portion, a second hole body portion, and a third hole body portion that communicate with each other; the second hole body portion and the third hole body portion are respectively arranged at both ends of the first hole body portion along the direction away from the axis of the rotor core; wherein, along the circumferential direction of the rotor core, both the second hole body portion and the third hole body portion protrude from the first hole body portion.

[0007] Further, a plane perpendicular to the axis of the rotor core is a predetermined plane; the projection of the first hole body portion on the predetermined plane extends along the radial direction of the rotor core; or the extension direction of the projection of the first hole body portion on the predetermined plane is parallel to the magnetic pole center line of the corresponding magnetic pole.

[0008] Further, a plane perpendicular to the axis of the rotor core is defined as a predetermined plane; the extending direction of the projection of the second hole body portion and the third hole body portion on the predetermined plane is perpendicular to the extending direction of the first hole body portion on the predetermined plane; or, the extending direction of the projection of the second hole body portion and the third hole body portion on the predetermined plane extends along the circumferential direction of the rotor core.

[0009] Further, the second hole body portion includes a first branch hole and a third branch hole. One end of the first branch hole communicates with the first hole body portion, and the other end of the first branch hole extends in a direction away from the magnetic pole center line of the corresponding magnetic pole; one end of the third branch hole communicates with the first hole body portion, and the other end of the third branch hole extends in a direction close to the magnetic pole center line of the corresponding magnetic pole; and / or the third hole body portion includes a second branch hole and a fourth branch hole. One end of the second branch hole communicates with the first hole body portion, and the other end of the second branch hole extends in a direction away from the magnetic pole center line of the corresponding magnetic pole; one end of the fourth branch hole communicates with the first hole body portion, and the other end of the fourth branch hole extends in a direction close to the magnetic pole center line of the corresponding magnetic pole.

[0010] Further, taking a plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the first hole body portion on the predetermined plane is strip-shaped with a length of A, the projection of the first branch hole on the predetermined plane is strip-shaped with a length of B, the projection of the third branch hole on the predetermined plane is strip-shaped with a length of C, and 6.5 ≥ (A + B + C) / A ≥ 2.3.

[0011] Further, taking a plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the first hole body portion on the predetermined plane is strip-shaped with a length of A, the projection of the second branch hole on the predetermined plane is strip-shaped with a length of D, the projection of the fourth branch hole on the predetermined plane is strip-shaped with a length of E, and 4 ≥ (A + D + E) / A ≥ 1.5.

[0012] Further, taking a plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the first hole body portion on the predetermined plane is strip-shaped with a length of A, the projection of the first branch hole on the predetermined plane is strip-shaped with a length of B, and the projection of the third branch hole on the predetermined plane is strip-shaped with a length of C; the minimum distance between the first branch hole and the permanent magnet on the side of the magnetic pole close to the first branch hole is H, and the width of the permanent magnet is J; each magnetic pole includes a plurality of magnetic isolation holes, and the plurality of magnetic isolation holes are arranged in pairs; the minimum distance between the third branch holes of the two paired magnetic isolation holes is K; wherein, 3.5 ≥ (A + B + C + J) / (H + K / 2) ≥ 0.8.

[0013] Further, taking a plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the first branch hole on the predetermined plane is strip-shaped with a length of B, and the projection of the second branch hole on the predetermined plane is strip-shaped with a length of D; wherein, B ≥ D.

[0014] Further, taking the plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the first branch hole on the predetermined plane is strip-shaped with a length of B, and the projection of the second branch hole on the predetermined plane is strip-shaped with a length of D; wherein, 5.2 ≥ B / D ≥ 1.4.

[0015] Further, taking the plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the third branch hole on the predetermined plane is strip-shaped with a length of C, and the projection of the fourth branch hole on the predetermined plane is strip-shaped with a length of E; wherein, C ≥ E.

[0016] Further, taking the plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the third branch hole on the predetermined plane is strip-shaped with a length of C, and the projection of the fourth branch hole on the predetermined plane is strip-shaped with a length of E; wherein, 2.5 ≥ C / E ≥ 1.2.

[0017] Further, taking the plane perpendicular to the axis of the rotor core as the predetermined plane; the projection of the first branch hole on the predetermined plane is strip-shaped with a maximum width of the first width N, the projection of the third branch hole on the predetermined plane is strip-shaped with a maximum width of the third width, and the first width N is equal to the third width; and / or the projection of the second branch hole on the predetermined plane is strip-shaped with a maximum width of the second width O, the projection of the fourth branch hole on the predetermined plane is strip-shaped with a maximum width of the fourth width, and the second width O is equal to the fourth width.

[0018] Further, taking the plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the first branch hole on the predetermined plane is strip-shaped with a maximum width of the first width N, and the projection of the second branch hole on the predetermined plane is strip-shaped with a maximum width of the second width O; wherein, 3 ≥ N / O ≥ 1.2.

[0019] Further, taking the plane perpendicular to the axis of the rotor core as the predetermined plane, the projection of the first hole body part on the predetermined plane is strip-shaped and the included angle between its center line and the magnetic pole center line of the corresponding magnetic pole is Q, and the included angle between the permanent magnet on one side of the corresponding magnetic pole and the magnetic pole center line of the magnetic pole is R; wherein, 0.6 ≥ Q / R ≥ 0.1.

[0020] Further, there are multiple magnetic isolation holes, and the multiple 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 symmetrically arranged with respect to the magnetic pole center line of the corresponding magnetic pole; and / or an intermediate magnetic bridge is formed between the two magnetic isolation holes in a pair. The width of one end of the intermediate magnetic bridge far from the axis of the rotor core is F, and the maximum width of the intermediate magnetic bridge is G; wherein, 3.7 ≥ G / F ≥ 1.3, and the width direction of the intermediate magnetic bridge is the distribution direction of the two magnetic isolation holes in a pair.

[0021] Furthermore, the total length of the magnetic isolation hole along the extension direction of the first hole body portion thereof is L, and the length of the permanent magnet is M; wherein 0.6≥L / M≥0.1.

[0022] Furthermore, along the circumference of the rotor core, a magnetic isolation bridge is formed between the magnetic isolation hole and the outer peripheral surface of the rotor core; the width of the magnetic isolation bridge along the radial direction of the rotor core is consistent; and / or the width of the magnetic isolation bridge along the radial direction of the rotor core is P, and the width of the motor air gap of the motor formed by the rotor structure is δ, 1.7≥P / δ≥0.2.

[0023] 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.

[0024] According to a third aspect of the present invention, a compressor is provided, comprising a motor, which is the motor described above.

[0025] The technical solution of the present invention is applied to provide 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; a magnetic isolation hole is opened on at least one magnetic pole, and the magnetic isolation hole includes a first hole body portion, a second hole body portion and a third hole body portion that are interconnected; the branch portions of the magnetic isolation hole, namely the second hole body portion and the third hole body portion, are respectively arranged at the two ends of the main body portion of the magnetic isolation hole, namely the first hole body portion, and along the circumference of the rotor core, the second hole body portion and the third hole body portion both protrude from the first hole body portion, that is, the length of the second hole body portion and the third hole body portion along the circumferential direction of the rotor core is greater than the length of the first hole body portion along the circumferential direction of the rotor core, which makes the width of the magnetic isolation hole have a gradient change. This makes the width of the magnetic isolation hole have a gradient change. 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 magnetic flux direction is improved, the air gap magnetic field distribution is adjusted, and the air gap magnetic density waveform is improved, thereby reducing the cogging effect of the motor, reducing the proportion of back-electromotive force harmonics of the motor, reducing the torque pulsation of the motor, reducing the peak value of the electromagnetic force density of the motor, and reducing the electromagnetic vibration noise of the motor. The problem of large vibration noise of the motor in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 A schematic structural diagram of a rotor structure according to a first embodiment of the present invention is shown;

[0028] Figure 2 Shows Figure 1Schematic diagram of the magnetic flux direction of the rotor structure shown;

[0029] Figure 3 Schematic structural diagram showing the rotor structure according to the second embodiment of the present invention;

[0030] Figure 4 Schematic structural diagram showing the rotor structure according to the third embodiment of the present invention;

[0031] Figure 5 Schematic structural diagram showing the rotor structure according to the fourth embodiment of the present invention;

[0032] Figure 6 Schematic structural diagram showing the rotor structure according to the fifth embodiment of the present invention;

[0033] Figure 7 Schematic structural diagram showing the rotor structure according to the sixth embodiment of the present invention;

[0034] Figure 8 Schematic comparison diagram showing the torque ripple of the existing motor and the motor of the present application measured;

[0035] Figure 9 Schematic comparison diagram showing the proportion of back electromotive force harmonics of the existing motor and the motor of the present application measured;

[0036] Figure 10 Schematic comparison diagram showing the peak value of electromagnetic force density of the existing motor and the motor of the present application measured; and

[0037] Figure 11 Schematic comparison diagram showing the total noise value of the compressor with the existing motor and the compressor with the motor of the present application measured.

[0038] Among them, the above-mentioned drawings include the following reference numerals:

[0039] 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; 421. First branch hole; 422. Third branch hole; 43. Third hole body part; 431. Second branch hole; 432. Fourth branch hole; 5. Intermediate magnetic bridge; 6. Magnetic isolation bridge; 7. Magnetic conduction path; 71. First path area; 72. Second path area; 73. Third path area. Detailed implementation manners

[0040] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0041] As Figures 1 to 7As shown in the figure, the present invention provides a rotor structure, which includes 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 include a plurality of N poles and a plurality of S poles alternately arranged along the circumferential direction of the rotor core 1. At least one magnetic pole 3 of the rotor core 1 is provided with a magnetic isolation hole 4, and the magnetic isolation hole 4 includes a first hole body part 41, a second hole body part 42 and a third hole body part 43 that communicate with each other. The second hole body part 42 and the third hole body part 43 are respectively arranged at both ends of the first hole body part 41 along the direction away from the axis of the rotor core 1. Among them, along the circumferential direction of the rotor core 1, both the second hole body part 42 and the third hole body part 43 protrude from the first hole body part 41.

[0042] Applying the technical solution of the present invention, a rotor structure with a rotor core 1, a plurality of permanent magnets 2 and a magnetic isolation hole 4 is provided. 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. At least one magnetic pole 3 is provided with a magnetic isolation hole 4. The magnetic isolation hole 4 includes a first hole body part 41, a second hole body part 42 and a third hole body part 43 that communicate with each other. The branched parts of the magnetic isolation hole 4, namely the second hole body part 42 and the third hole body part 43, are respectively arranged at both ends of the main part of the magnetic isolation hole 4, namely the first hole body part 41. And along the circumferential direction of the rotor core 1, both the second hole body part 42 and the third hole body part 43 protrude from the first hole body part 41, that is, the lengths of the second hole body part 42 and the third hole body part 43 along the circumferential direction of the rotor core 1 are both greater than the length of the first hole body part 41 along the circumferential direction of the rotor core 1. This makes the width of the magnetic isolation hole 4 have a gradient change. Through the technical solution provided by the present invention, the magnetic resistance distribution at each part of the motor magnetic circuit is effectively improved, the magnetic flux direction is improved, the air-gap magnetic field distribution is adjusted, and the air-gap magnetic density waveform is improved, thereby reducing the cogging effect of the motor, reducing the proportion of back electromotive force harmonics in the motor, reducing the torque ripple of the motor, reducing the peak value of the electromagnetic force density of the motor, and reducing the electromagnetic vibration and noise of the motor, and solving the problem of large vibration and noise of the motor in the prior art.

[0043] Specifically, the rotor core 1 is made of a material with strong magnetic conductivity and has a small magnetic resistance. Optionally, the rotor core 1 is a silicon steel sheet, and magnetic force lines are easy to pass through; while the magnetic isolation hole 4 is filled with non-magnetic substances such as air, with poor magnetic conductivity and large magnetic resistance, and magnetic force lines are not easy to pass through. By providing such a magnetic isolation hole 4, the magnetic resistance distribution at each part of the magnetic circuit of the motor rotor structure is changed, the magnetic force line direction in the rotor structure is changed, and the air-gap magnetic density waveform is improved, thereby reducing the proportion of back electromotive force harmonics, reducing the motor torque ripple, reducing the electromagnetic force amplitude, and reducing the electromagnetic vibration and noise of the motor.

[0044] Such as Figure 2As shown in the figure, 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 field lines. The solid lines with arrows indicate that there are more magnetic field lines passing through at this position, and the dashed lines with arrows indicate that there are very few magnetic field lines passing through at this position. From Figure 2 It can be clearly seen that at the position where the magnetic isolation hole 4 is located, there are fewer magnetic field lines passing through. The magnetic isolation hole 4 provided by the present invention effectively improves the distribution of the magnetic field lines of the rotor structure.

[0045] In Figures 1 to 7 the embodiment shown, the plane perpendicular to the axis of the rotor core 1 is the predetermined plane; the projection of the first hole body portion 41 on the predetermined plane extends in the radial direction of the rotor core 1; or the extension direction of the projection of the first hole body portion 41 on the predetermined plane is parallel to the magnetic pole center line 31 of the corresponding magnetic pole 3.

[0046] In Figures 1 to 7 the embodiment shown, the plane perpendicular to the axis of the rotor core 1 is the predetermined plane; the extension directions of the projections of the second hole body portion 42 and the third hole body portion 43 on the predetermined plane are perpendicular to the extension direction of the projection of the first hole body portion 41 on the predetermined plane; or the extension directions of the projections of the second hole body portion 42 and the third hole body portion 43 on the predetermined plane extend along the circumferential direction of the rotor core 1.

[0047] The rotor structure provided by the present invention adopts the magnetic isolation hole 4 with an "I"-shaped structure. The magnetic isolation hole 4 has a first hole body portion 41 extending in the radial direction of the rotor core 1, that is, the main body of the magnetic isolation hole 4, and a second hole body portion 42 and a third hole body portion 43 extending in the circumferential direction of the rotor, that is, the branch portions extending from the main body of the magnetic isolation hole 4. The first hole body portion 41 has a first end portion and a second end portion located in the circumferential direction of the rotor core 1 and a first head portion and a second head portion located in the radial direction of the rotor core 1, the second hole body portion 42 includes a first branch hole 421 and a third branch hole 422, and the third hole body portion 43 includes a second branch hole 431 and a fourth branch hole 432. In the magnetic isolation hole 4, the first branch hole 421 and the second branch hole 431 are both arranged at the first end of the first hole body 41, the third branch hole 422 and the fourth branch hole 432 are both arranged at the second end of the first hole body 41, the first branch hole 421 and the third branch hole 422 are both arranged at the first head of the first hole body 41, and the second branch hole 431 and the fourth branch hole 432 are both arranged at the second head of the first hole body 41, which makes the shape of the magnetic isolation hole 4 along the radial direction of the rotor core 1 an "I"-shaped structure with wide ends and narrow middle, and the width of the magnetic isolation hole 4 along the radial direction of the rotor core 1 has a gradient change. In this way, the magnetic flux distribution in the magnetic conductive area between the first branch hole 421 and the permanent magnet 2, in the magnetic conductive area between the second branch hole 431 and the permanent magnet 2, and in the intermediate magnetic bridge 5 can be improved, so that the magnetic conductivity of the magnetic circuit of the rotor structure is more uniform when the motor is running, and the air gap magnetic flux waveform is improved to reduce the torque pulsation of the motor, reduce the proportion of back-electromotive force harmonics of the motor, and reduce the peak electromagnetic force density and electromagnetic vibration noise of the motor.

[0048] exist Figures 1 to 7In the illustrated embodiment, the second hole body portion 42 includes a first branch hole 421 and a third branch hole 422. One end of the first branch hole 421 communicates with the first hole body portion 41, and the other end of the first branch hole 421 extends in a direction away from the magnetic pole center line 31 of the corresponding magnetic pole 3; One end of the third branch hole 422 communicates with the first hole body portion 41, and the other end of the third branch hole 422 extends in a direction close to the magnetic pole center line 31 of the corresponding magnetic pole 3; and / or The third hole body portion 43 includes a second branch hole 431 and a fourth branch hole 432. One end of the second branch hole 431 communicates with the first hole body portion 41, and the other end of the second branch hole 431 extends in a direction away from the magnetic pole center line 31 of the corresponding magnetic pole 3; One end of the fourth branch hole 432 communicates with the first hole body portion 41, and the other end of the fourth branch hole 432 extends in a direction close to the magnetic pole center line 31 of the corresponding magnetic pole 3. In this way, it is possible to improve the magnetic flux distribution in the magnetic conduction region between the first branch hole 421 and the permanent magnet 2, the magnetic conduction region between the second branch hole 431 and the permanent magnet 2, and the intermediate magnetic bridge 5, so that the magnetic conductance at each part of the magnetic circuit of the rotor structure is more uniform when the motor operates, improve the air-gap magnetic density waveform, reduce the torque ripple of the motor, reduce the proportion of back electromotive force harmonics of the motor, and reduce the peak value of the electromagnetic force density and the electromagnetic vibration noise of the motor.

[0049] Preferably, as Figure 1 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the first hole body portion 41 on the predetermined plane is strip-shaped with a length of A, the projection of the first branch hole 421 on the predetermined plane is strip-shaped with a length of B, the projection of the third branch hole 422 on the predetermined plane is strip-shaped with a length of C, and 6.5 ≥ (A + B + C) / A ≥ 2.3.

[0050] As Figure 1 shown, the projections of the first hole body portion 41, the first branch hole 421, and the third branch hole 422 on the predetermined plane are strip-shaped. The length A of the projection of the first hole body portion 41 on the predetermined plane is the width in the circumferential direction of the rotor core 1; The length B of the projection of the first branch hole 421 on the predetermined plane is the width in the circumferential direction of the rotor core 1; The length C of the projection of the third branch hole 422 on the predetermined plane is the width in the circumferential direction of the rotor core 1.

[0051] The width of the magnetic isolation hole 4 on the side closer to the axis of the rotor core 1 is greater than the width of the main body part of the magnetic isolation hole 4. The width of the magnetic isolation hole 4 on the side closer to the axis of the rotor core 1 is the combined width of the first hole body part 41, the first branch hole 421, and the third branch hole 422. Through the setting method of the relationship between the widths A, B, and C of the first hole body part 41, the first branch hole 421, and the third branch hole 422 in the circumferential direction of the rotor core 1 in this application, the first branch hole 421 can be made closer to the side of the permanent magnet closer to the axis of the rotor core 1, effectively improving the magnetic flux direction on the side of the permanent magnet closer to the axis of the rotor core 1.

[0052] The main body part of the magnetic isolation hole 4 (i.e., the first hole body part 41) extends along the radial direction of the rotor core 1, and its length in the radial direction of the rotor core 1 is relatively long. And the inside of the magnetic isolation hole 4 is made of non-magnetic material with a large magnetic resistance. If the magnetic isolation hole 4 is too wide, it will reduce the magnetic conduction area of the magnetic flux of the permanent magnet 2. When the value of (A + B + C) / A is set within the range of 2.3 to 6.5, while ensuring the output torque of the motor, it can effectively improve the magnetic field distribution at the air gap, reduce the harmonic ratio, reduce the harmonic loss, improve the efficiency of the motor, and reduce the peak value of the electromagnetic force density of the motor and the electromagnetic vibration noise of the motor.

[0053] Preferably, as Figure 1 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the first hole body part 41 on the predetermined plane is strip-shaped with a length of A, the projection of the second branch hole 431 on the predetermined plane is strip-shaped with a length of D, the projection of the fourth branch hole 432 on the predetermined plane is strip-shaped with a length of E, and 4 ≥ (A + D + E) / A ≥ 1.5.

[0054] The projections of the first hole body part 41, the second branch hole 431, and the fourth branch hole 432 on the predetermined plane are strip-shaped. The length A of the projection of the first hole body part 41 on the predetermined plane is its width in the circumferential direction of the rotor core 1; the length D of the projection of the second branch hole 431 on the predetermined plane is its width in the circumferential direction of the rotor core 1; the length E of the projection of the fourth branch hole 432 on the predetermined plane is its width in the circumferential direction of the rotor core 1.

[0055] The width of one end of the magnetic isolation hole 4 close to the outer peripheral surface of the rotor core 1 is greater than the width A of the main body part of the magnetic isolation hole 4. The width of one end of the magnetic isolation hole 4 close to the outer peripheral surface of the rotor core 1 is the combined width A + D + E of the first hole body part 41, the second branch hole 431 and the fourth branch hole 432. The second branch hole 431 and the fourth branch hole 432 are located on the side close to the outer peripheral surface of the rotor core 1, and the inside of the magnetic isolation hole 4 is made of non-magnetic material. If the width of the magnetic isolation hole 4 on the side close to the outer peripheral surface of the rotor core 1 is too large, it will increase the magnetic resistance at the air gap and hinder the magnetic flux of the rotor structure from being transmitted to the electronic structure. When the value of (A + D + E) / A is set within the range of 1.5 to 4, while ensuring the output torque of the motor, it can effectively improve the magnetic field distribution at the air gap, reduce the peak value of the electromagnetic force density of the motor, and reduce the electromagnetic vibration noise of the motor.

[0056] As Figure 1 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the first hole body part 41 on the predetermined plane is strip-shaped with a length of A, the projection of the first branch hole 421 on the predetermined plane is strip-shaped with a length of B, and the projection of the third branch hole 422 on the predetermined plane is strip-shaped with a length of C; the minimum distance between the first branch hole 421 and the permanent magnet 2 located on the side of the magnetic pole 3 close to the first branch hole 421 is H, and the width of the permanent magnet 2 is J; 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 minimum distance between the third branch holes 422 of two paired magnetic isolation holes 4 is K; wherein, 3.5 ≥ (A + B + C + J) / (H + K / 2) ≥ 0.8.

[0057] There is a distance between the first branch hole 421 and the permanent magnet 2. The minimum distance between the first branch hole 421 and the permanent magnet 2 is H, and the thickness (i.e., width) of the permanent magnet 2 is J. The first path region 71 and the second path region 72 of the magnetic conduction path 7 are respectively formed between the first branch holes 421 of the two magnetic isolation holes 4 at the same magnetic pole 3 and the permanent magnet 2 they are close to, and the third path region 73 of the magnetic conduction path 7 is formed between the third branch holes 422 of the two magnetic isolation holes 4. The magnetic resistance of the magnetic conduction path 7 is small; while the first branch hole 421 and the third branch hole 422 extend along the circumferential direction of the rotor core 1, and the inside of the first branch hole 421 and the third branch hole 422 is made of non-magnetic material such as air, and its magnetic resistance is large, so that the magnetic flux on the side of the permanent magnet 2 close to the central axis of the rotor core 1 is concentrated in the regions of both ends and the middle magnetic bridge 5 of the magnetic pole 3.

[0058] When the value of (A + B + C + J) / (H + K / 2) is set within the range of 0.8 to 3.5, the magnetic conductance distribution in the rotor structure is made more uniform, and the air gap magnetic density waveform can also be improved, thereby reducing the torque ripple of the motor, reducing the peak value of the electromagnetic force density of the motor and the electromagnetic vibration noise of the motor.

[0059] As Figures 1 to 7 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the first branch hole 421 on the predetermined plane is strip-shaped with a length of B, and the projection of the second branch hole 431 on the predetermined plane is strip-shaped with a length of D; wherein, B≥D.

[0060] As Figure 3 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the first branch hole 421 on the predetermined plane is strip-shaped with a length of B, and the projection of the second branch hole 431 on the predetermined plane is strip-shaped with a length of D; wherein, 5.2≥B / D≥1.4.

[0061] The projections of the first branch hole 421 and the second branch hole 431 on the predetermined plane are strip-shaped. The length B of the projection of the first branch hole 421 on the predetermined plane is the width in the circumferential direction of the rotor core 1; the length D of the projection of the second branch hole 431 on the predetermined plane is the width in the circumferential direction of the rotor core 1.

[0062] The width of the first branch hole 421 in the circumferential direction of the rotor core 1 is greater than the width of the second branch hole 431 of the same magnetic isolation hole 4 in the circumferential direction of the rotor core 1, which can make the first branch hole 421 closer to the side of the permanent magnet close to the axis of the rotor core 1, thereby changing the magnetic flux direction starting from the side of the permanent magnet 2 close to the axis of the rotor core 1; since the second branch hole 431 is close to the outer peripheral surface of the rotor core 1, if the width of the second branch hole 431 in the circumferential direction of the rotor core 1 is too large, it will increase the magnetic resistance at the air gap, thereby reducing the output torque of the motor. Therefore, the width of the second branch hole 431 in the circumferential direction of the rotor core 1 should be smaller than the width of the first branch hole 421 in the circumferential direction of the rotor core 1.

[0063] When the value of B / D is set within the range of 1.4 to 5.2, it can effectively improve the magnetic field distribution at the air gap, reduce the peak value of the electromagnetic force density of the motor, and reduce the electromagnetic vibration noise of the motor.

[0064] As Figures 1 to 7 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the third branch hole 422 on the predetermined plane is strip-shaped with a length of C, and the projection of the fourth branch hole 432 on the predetermined plane is strip-shaped with a length of E; wherein, C≥E.

[0065] As Figure 4 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the third branch hole 422 on the predetermined plane is strip-shaped with a length of C, and the projection of the fourth branch hole 432 on the predetermined plane is strip-shaped with a length of E; wherein, 2.5≥C / E≥1.2.

[0066] The projections of the third branch hole 422 and the fourth branch hole 432 on a predetermined plane are strip-shaped. The length C of the projection of the third branch hole 422 on the predetermined plane is the width of the third branch hole 422 in the circumferential direction of the rotor core 1; the length E of the projection of the fourth branch hole 432 on the predetermined plane is the width of the fourth branch hole 432 in the circumferential direction of the rotor core 1.

[0067] The width of the third branch hole 422 in the circumferential direction of the rotor core 1 is greater than the width of the fourth branch hole 432 of the same magnetic isolation hole 4 in the circumferential direction of the rotor core 1, which can make the third branch hole 422 close to the magnetic pole center line 31 on one side of the axis of the rotor core 1, and the fourth branch hole 432 close to the magnetic pole center line 31 on one side of the outer peripheral surface of the rotor core 1.

[0068] When the value of C / E is set within the range of 1.2 to 2.5, the permeance in the radial direction and the circumferential direction of the motor magnetic circuit can be adjusted simultaneously, the permeance uniformity of the entire magnetic circuit during the operation of the motor can be improved, thereby reducing the cogging effect of the motor, reducing the torque ripple of the motor, improving the air-gap magnetic density waveform, reducing the proportion of the back electromotive force harmonics of the motor, and reducing the peak value of the electromagnetic force density and the electromagnetic vibration noise of the motor.

[0069] As Figure 4 shown, the plane perpendicular to the axis of the rotor core 1 is used as the predetermined plane; the projection of the first branch hole 421 on the predetermined plane is strip-shaped and the maximum width is the first width N, the projection of the third branch hole 422 on the predetermined plane is strip-shaped and the maximum width is the third width, and the first width N is equal to the third width; and / or the projection of the second branch hole 431 on the predetermined plane is strip-shaped and the maximum width is the second width O, the projection of the fourth branch hole 432 on the predetermined plane is strip-shaped and the maximum width is the fourth width, and the second width O is equal to the fourth width.

[0070] The projections of the first branch hole 421, the second branch hole 431, the third branch hole 422 and the fourth branch hole 432 on the predetermined plane are all strip-shaped. The maximum width N of the projection of the first branch hole 421 on the predetermined plane is the length of the first branch hole 421 in the radial direction of the rotor core 1; the maximum width O of the projection of the second branch hole 431 on the predetermined plane is the length of the second branch hole 431 in the radial direction of the rotor core 1; the maximum width of the projection of the third branch hole 422 on the predetermined plane is the length of the third branch hole 422 in the radial direction of the rotor core 1; the maximum width of the projection of the fourth branch hole 432 on the predetermined plane is the length of the fourth branch hole 432 in the radial direction of the rotor core 1.

[0071] Preferably, the first branch hole 421 and the third branch hole 422 of the same magnetic isolation hole 4 are located on the side of the main part of the magnetic isolation hole 4 close to the axis of the rotor core 1 and extend along the circumferential direction of the rotor core 1. The lengths of the first branch hole 421 and the third branch hole 422 in the radial direction of the rotor core 1 are equal, which can make the magnetic conductance closer to the axis direction of the rotor core 1 more uniform, improve the magnetic field at the air gap, improve the waveform of the air gap magnetic density, thereby reducing the proportion of the back electromotive force harmonics of the motor, reducing the peak value of the electromagnetic force density of the motor, and reducing the electromagnetic vibration noise of the motor.

[0072] Preferably, the second branch hole 431 and the fourth branch hole 432 of the same magnetic isolation hole 4 are located on the side of the main part of the magnetic isolation hole 4 close to the outer peripheral surface of the rotor core 1 and extend along the circumferential direction of the rotor core 1. The lengths of the second branch hole 431 and the fourth branch hole 432 in the radial direction of the rotor core 1 are equal, which can make the circumferential magnetic conductance closer to the outer peripheral surface of the rotor core 1 more uniform, improve the magnetic field at the air gap, improve the waveform of the air gap magnetic density, thereby reducing the proportion of the back electromotive force harmonics of the motor, reducing the peak value of the electromagnetic force density of the motor, and reducing the electromagnetic vibration noise of the motor.

[0073] As Figure 5 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the first branch hole 421 on the predetermined plane is strip-shaped and the maximum width is the first width N, and the projection of the second branch hole 431 on the predetermined plane is strip-shaped and the maximum width is the second width O; wherein, 3≥N / O≥1.2.

[0074] The projections of the first branch hole 421 and the second branch hole 431 on the predetermined plane are strip-shaped. The maximum width N of the projection of the first branch hole 421 on the predetermined plane is the length of the first branch hole 421 in the radial direction of the rotor core 1; the maximum width O of the projection of the second branch hole 431 on the predetermined plane is the length of the second branch hole 431 in the radial direction of the rotor core 1.

[0075] The length of the first branch hole 421 in the radial direction of the rotor core 1 is greater than the length of the second branch hole 431 in the radial direction of the rotor core 1.

[0076] When the value of N / O is set within the range of 1.2 to 3, the first branch hole 421 is on the side closer to the axis of the rotor core 1. The greater the length of the first branch hole 421 in the radial direction of the rotor core 1, the greater its magnetic resistance. It can adjust the magnetic flux transmitted from the side of the permanent magnet 2 close to the axis of the rotor core 1 to both sides of the magnetic isolation hole 4. The second branch hole 431 is on the side closer to the outer peripheral surface of the rotor core 1, which changes the magnetic flux direction transmitted from one side of the axis of the rotor core 1 to the air gap, thereby improving the magnetic flux density at various positions of the air gap, improving the magnetic field at the air gap, improving the air gap magnetic density waveform, reducing the proportion of back electromotive force harmonics of the motor, reducing the peak value of the electromagnetic force density of the motor, and reducing the electromagnetic vibration noise of the motor.

[0077] As Figure 6 shown, taking the plane perpendicular to the axis of the rotor core 1 as the predetermined plane, the projection of the first hole body part 41 on the predetermined plane is strip-shaped and the included angle Q between its center line and the magnetic pole center line of the corresponding magnetic pole 3; the included angle R between the permanent magnet 2 on one side of the corresponding magnetic pole 3 and the magnetic pole center line 31 of the magnetic pole 3; wherein, 0.6≥Q / R≥0.1.

[0078] The included angle Q between the center line of the projection of the first hole body part 41 on the predetermined plane and the magnetic pole center line of the corresponding magnetic pole 3 is the angle between the main part of the magnetic isolation hole 4 and the magnetic pole center line 31 of the same magnetic pole 3.

[0079] In this embodiment, the magnetic isolation hole with an "I" - shaped structure has hole parts extending in both the radial and circumferential directions of the rotor and is inclined relative to the magnetic pole center line.

[0080] When the value of Q / R is set within the range of 0.1 to 0.6, it makes the magnetic conductance distribution in the radial and circumferential directions of the rotor core 1 more uniform, thereby improving the magnetic field distribution at the air gap, improving the air gap magnetic density waveform, reducing harmonics, and reducing the peak value of the electromagnetic force density and the vibration noise of the motor.

[0081] There are multiple magnetic isolation holes 4, and the multiple 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 symmetrically arranged with respect to the magnetic pole center line 31 of the corresponding magnetic pole 3; and / or an intermediate magnetic bridge 5 is formed between the two magnetic isolation holes 4 in a pair. The width of the end of the intermediate magnetic bridge 5 far from the axis of the rotor core 1 is F, and the maximum width of the intermediate magnetic bridge 5 is G; wherein, 3.7≥G / F≥1.3, and the width direction of the intermediate magnetic bridge 5 is the distribution direction of the two magnetic isolation holes 4 in a pair.

[0082] There are at least two magnetic isolation holes 4 on each magnetic pole 3. The two magnetic isolation holes 4 are symmetric about the magnetic pole center line 31 of the magnetic pole 3, and there is a distance between the two magnetic isolation holes 4, that is, the middle magnetic bridge 5. The width of the side of the middle magnetic bridge 5 close to the outer peripheral surface of the rotor core 1 is F, and the width in the middle of the middle magnetic bridge 5 is G.

[0083] The width of the middle magnetic bridge 5 has a gradient change in the circumferential direction of the rotor core 1. The width change of the middle magnetic bridge 5 from the side close to the axis of the rotor core 1 to the side close to the outer peripheral surface of the rotor core 1 is "narrow-wide-narrow", which can improve the magnetic flux in the middle of the magnetic pole 3; there is a distance between the first branch hole 421 and the permanent magnet 2 to allow the magnetic flux to pass through; the inside of the magnetic isolation hole is a non-magnetic substance such as air, with a large magnetic resistance, and only a small part of the magnetic flux can pass through. In this way, the first path region 71, the second path region 72, and the third path region 73 of the magnetic conduction path 7 are formed.

[0084] When the value of G / F is set within the range of 1.3 to 3.7, the magnetic flux at each magnetic conduction path 7 can be improved, thereby improving the air-gap magnetic density waveform, reducing the torque ripple of the motor, reducing the peak value of the electromagnetic force density of the motor, and reducing the electromagnetic vibration noise of the motor.

[0085] As Figure 1 shown, the total length of the magnetic isolation hole 4 along the extension direction of its first hole body 41 is L, and the length of the permanent magnet 2 is M; wherein, 0.6≥L / M≥0.1.

[0086] In this embodiment, the total length L of the magnetic isolation hole 4 along the extension direction of its first hole body 41 is the length of the magnetic isolation hole 4 in the radial direction of the rotor core 1; the length M of the permanent magnet 2 is the length of the permanent magnet 2 in the radial direction of the rotor core 1. In order to improve the efficiency of the motor by increasing the effective magnetic flux of the permanent magnet 2, it is necessary to increase the length of the permanent magnet 2 in the radial direction of the rotor core 1 so that the length of the magnetic isolation hole 4 in the radial direction of the rotor core 1 is less than the length of the permanent magnet 2 in the radial direction of the rotor core 1.

[0087] When the value of L / M is set within the range of 0.1 to 0.6, the magnetic flux directions and magnetic fluxes of the permanent magnet 2 near the axis of the rotor core 1 and near the outer peripheral surface of the rotor core 1 generated on the rotor core 1 can be effectively adjusted, thereby optimizing the magnetic field distribution at the air gap of the motor, reducing the torque ripple of the motor, reducing the peak value of the electromagnetic force density of the motor, and reducing the electromagnetic vibration noise of the motor.

[0088] As Figure 7As shown, along the circumferential direction of the rotor core 1, a magnetic isolation bridge 6 is formed between the magnetic isolation holes 4 and the outer peripheral surface of the rotor core 1; the width of the magnetic isolation bridge 6 in the radial direction of the rotor core 1 is consistent; and / or the width of the magnetic isolation bridge 6 in the radial direction of the rotor core 1 is P, and the width of the motor air gap of the motor formed by the rotor structure is δ, and 1.7 ≥ P / δ ≥ 0.2.

[0089] Wherein, the width δ of the motor air gap of the motor formed by the rotor structure is the gap between the rotor structure and the stator structure of the motor, and the air gap magnetic density refers to the magnetic induction intensity of the magnetic field existing in the air gap.

[0090] There is a magnetic isolation bridge 6 between the main part (i.e., the first hole body part 41) of the magnetic isolation hole 4 and the outer peripheral surface of the rotor core 1, and a part of the magnetic lines of force is allowed to be transmitted to the air gap at the magnetic isolation bridge 6. Along the radial direction of the rotor core 1, the widths of the magnetic isolation bridge 6 at various places are uniformly consistent. When the value of P / δ is set within the range of 0.2 to 1.7, the magnetic flux transmitted at the magnetic isolation bridge 6 is the best, the waveform of the air gap magnetic density is optimally improved, the peak value of the electromagnetic force density of the motor reaches the lowest, and the vibration and noise of the motor also reach the lowest.

[0091] 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 and noise of the motor can be reduced.

[0092] The present invention also provides a compressor, including a motor, and the motor is the above-mentioned motor. In this way, the vibration and noise of the compressor can be reduced.

[0093] As Figure 8 shown, it is a comparison chart of the torque pulsations 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 pulsation of the motor of the present application is much smaller than the range of the torque pulsation of the existing motor.

[0094] As Figure 9 shown, it is a comparison chart of the back electromotive force harmonic ratio of the existing motor and the motor of the present application measured. It can be clearly seen in Figure 9 that the back electromotive force harmonic ratio of the motor of the present application is much smaller than the back electromotive force harmonic ratio of the existing motor.

[0095] As Figure 10 shown, it is a comparison chart of the peak values of the electromagnetic force density of the existing motor and the motor of the present application at 6 times frequency, 12 times frequency, 18 times frequency, 24 times frequency, 30 times frequency and 36 times frequency. It can be clearly seen in Figure 10 that the peak values of the electromagnetic force density of the motor of the present application at 6 times frequency, 18 times frequency and 36 times frequency are much smaller than the peak values of the electromagnetic force density of the existing motor at 6 times frequency, 18 times frequency and 36 times frequency.

[0096] AsFigure 11 As shown, it is a comparison chart of the total noise values of a compressor with an existing motor and a compressor with the motor of this application. It can be clearly seen in Figure 11 that the total noise value of the compressor with the motor of this application is much smaller than that of the compressor with the existing motor.

[0097] In the present invention, the rotor structure includes a rotor core 1 and permanent magnets 2. The permanent magnets 2 are arranged in the permanent magnet slots on the rotor core 1. The permanent magnets 2 on the rotor form alternating N poles and S poles. A magnetic isolation hole 4 is formed 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 radial direction of the rotor core 1, that is, the main part of the magnetic isolation hole 4, and a second hole body part 42 and a third hole body part 43 extending along the circumferential direction of the rotor core 1, that is, a first branch hole 421, a second branch hole 431, a third branch hole 422 and a fourth branch hole 432 extending from the main part of the magnetic isolation hole 4. 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 two ends of the magnetic isolation hole 4 are wide and the middle is narrow, resembling a "work" - shaped structure.

[0098] 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 permanent magnets 2 made of materials with a fixed grade, their 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 density of the motor is large, resulting in relatively large torque ripple and vibration noise of the motor.

[0099] By forming a "work" - shaped magnetic isolation hole 4 on the rotor core 1 in the present invention, the magnetic resistance distribution of the magnetic circuits at various parts of the motor is changed, achieving the technical effects of reducing the cogging effect of the motor, reducing the torque ripple of the motor, improving the waveform of the air - gap magnetic flux density, reducing the proportion of back - electromotive force harmonics, reducing the peak value of the electromagnetic force density of the motor, and reducing the electromagnetic vibration noise of the motor, and solving the problems of high distortion rate of the air - gap magnetic flux density and back - electromotive force waveform, large proportion of 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.

[0100] The technical solution of 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; at least one magnetic pole 3 is provided with a magnetic isolation hole 4, and the magnetic isolation hole 4 includes a first hole body portion 41 (i.e., the main part of the magnetic isolation hole 4), a second hole body portion 42, and a third hole body portion 43 (i.e., the branch part of the magnetic isolation hole 4) that communicate with each other; the branch parts of the magnetic isolation hole 4 (i.e., the second hole body portion 42 and the third hole body portion 43) are respectively arranged at both ends of the main part of the magnetic isolation hole 4, and the lengths of the second hole body portion 42 and the third hole body portion 43 in the circumferential direction of the rotor core 1 are both greater than the length of the first hole body portion 41 in the circumferential direction of the rotor core 1, which makes the width of the magnetic isolation hole 4 have a gradient change. 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 magnetic flux direction is improved, the air-gap magnetic field distribution is adjusted, the air-gap magnetic density waveform is improved, thereby achieving the technical effects of 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 density of the motor, and reducing the electromagnetic vibration noise of the motor, and solving the problem of large vibration noise of the motor in the prior art.

[0101] 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 can have various changes and modifications. 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 the magnetic isolation hole (4) includes a first hole body part (41), a second hole body part (42) and a third hole body part (43) that communicate with each other; the second hole body part (42) and the third hole body part (43) are respectively arranged at both ends of the first hole body part (41) along the direction away from the axis of the rotor core (1); Wherein, along the circumferential direction of the rotor core (1), both the second hole body part (42) and the third hole body part (43) protrude from the first hole body part (41); Taking a plane perpendicular to the axis of the rotor core (1) as a predetermined plane, the projection of the first hole body part (41) on the predetermined plane is strip-shaped and the included angle between its center line and the magnetic pole center line of the corresponding magnetic pole (3) is Q, and the included angle between the permanent magnet (2) on one side of the corresponding magnetic pole (3) and the magnetic pole center line (31) of the magnetic pole (3) is R; wherein, 0.6≥Q / R≥0.

1.

2. The rotor structure according to claim 1, Characterized in that, Taking a plane perpendicular to the axis of the rotor core (1) as a predetermined plane; The projection of the first hole body part (41) on the predetermined plane extends along the radial direction of the rotor core (1); or The extending direction of the projection of the first hole body part (41) on the predetermined plane is 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, Taking a plane perpendicular to the axis of the rotor core (1) as a predetermined plane; The extending directions of the projections of the second hole body part (42) and the third hole body part (43) on the predetermined plane are perpendicular to the extending direction of the first hole body part (41) on the predetermined plane; Or, The extending directions of the projections of the second hole body part (42) and the third hole body part (43) on the predetermined plane extend along the circumferential direction of the rotor core (1).

4. The rotor structure according to claim 1, Characterized in that, The second hole body part (42) includes a first branch hole (421) and a third branch hole (422), one end of the first branch hole (421) communicates with the first hole body part (41), and the other end of the first branch hole (421) extends in a direction away from the magnetic pole center line (31) of the corresponding magnetic pole (3); one end of the third branch hole (422) communicates with the first hole body part (41), and the other end of the third branch hole (422) extends in a direction close to the magnetic pole center line (31) of the corresponding magnetic pole (3); and / or The third hole body part (43) includes a second branch hole (431) and a fourth branch hole (432). One end of the second branch hole (431) communicates with the first hole body part (41), and the other end of the second branch hole (431) extends in a direction away from the magnetic pole center line (31) of the corresponding magnetic pole (3). One end of the fourth branch hole (432) communicates with the first hole body part (41), and the other end of the fourth branch hole (432) extends in a direction close to the magnetic pole center line (31) of the corresponding magnetic pole (3).

5. The rotor structure according to claim 4, wherein, Taking the plane perpendicular to the axis of the rotor core (1) as a predetermined plane, the projection of the first hole body part (41) on the predetermined plane is strip-shaped with a length of A, the projection of the first branch hole (421) on the predetermined plane is strip-shaped with a length of B, the projection of the third branch hole (422) on the predetermined plane is strip-shaped with a length of C, and 6.5 ≥ (A + B + C) / A ≥ 2.

3.

6. The rotor structure according to claim 4, wherein, Taking the plane perpendicular to the axis of the rotor core (1) as a predetermined plane, the projection of the first hole body part (41) on the predetermined plane is strip-shaped with a length of A, the projection of the second branch hole (431) on the predetermined plane is strip-shaped with a length of D, the projection of the fourth branch hole (432) on the predetermined plane is strip-shaped with a length of E, and 4 ≥ (A + D + E) / A ≥ 1.

5.

7. The rotor structure according to claim 4, wherein, Taking the plane perpendicular to the axis of the rotor core (1) as a predetermined plane, the projection of the first hole body part (41) on the predetermined plane is strip-shaped with a length of A, the projection of the first branch hole (421) on the predetermined plane is strip-shaped with a length of B, and the projection of the third branch hole (422) on the predetermined plane is strip-shaped with a length of C; The minimum distance between the first branch hole (421) and the permanent magnet (2) located on the side of the magnetic pole (3) close to the first branch hole (421) is H, and the width of the permanent magnet (2) is J; 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 minimum distance between the third branch holes (422) of two paired magnetic isolation holes (4) is K; wherein, 3.5 ≥ (A + B + C + J) / (H + K / 2) ≥ 0.

8.

8. The rotor structure according to claim 4, wherein, Taking the plane perpendicular to the axis of the rotor core (1) as a predetermined plane, the projection of the first branch hole (421) on the predetermined plane is strip-shaped with a length of B, and the projection of the second branch hole (431) on the predetermined plane is strip-shaped with a length of D; wherein, B ≥ D.

9. The rotor structure according to claim 4, wherein, Taking the plane perpendicular to the axis of the rotor core (1) as the predetermined plane, the projection of the first branch hole (421) on the predetermined plane is strip-shaped with a length of B, and the projection of the second branch hole (431) on the predetermined plane is strip-shaped with a length of D; wherein, 5.2 ≥ B / D ≥ 1.

4.

10. The rotor structure according to claim 4, characterized in that Taking the plane perpendicular to the axis of the rotor core (1) as the predetermined plane, the projection of the third branch hole (422) on the predetermined plane is strip-shaped with a length of C, and the projection of the fourth branch hole (432) on the predetermined plane is strip-shaped with a length of E; wherein, C ≥ E.

11. The rotor structure according to claim 4, characterized in that Taking the plane perpendicular to the axis of the rotor core (1) as the predetermined plane, the projection of the third branch hole (422) on the predetermined plane is strip-shaped with a length of C, and the projection of the fourth branch hole (432) on the predetermined plane is strip-shaped with a length of E; wherein, 2.5 ≥ C / E ≥ 1.

2.

12. The rotor structure according to claim 4, characterized in that Taking the plane perpendicular to the axis of the rotor core (1) as the predetermined plane; the projection of the first branch hole (421) on the predetermined plane is strip-shaped with a maximum width of the first width N, the projection of the third branch hole (422) on the predetermined plane is strip-shaped with a maximum width of the third width, and the first width N is equal to the third width; and / or the projection of the second branch hole (431) on the predetermined plane is strip-shaped with a maximum width of the second width O, the projection of the fourth branch hole (432) on the predetermined plane is strip-shaped with a maximum width of the fourth width, and the second width O is equal to the fourth width.

13. The rotor structure according to claim 4, characterized in that Taking the plane perpendicular to the axis of the rotor core (1) as the predetermined plane, the projection of the first branch hole (421) on the predetermined plane is strip-shaped with a maximum width of the first width N, and the projection of the second branch hole (431) on the predetermined plane is strip-shaped with a maximum width of the second width O; wherein, 3 ≥ N / O ≥ 1.

2.

14. The rotor structure according to claim 1, characterized in that the magnetic isolation holes (4) are multiple, and the multiple magnetic isolation holes (4) are arranged in pairs, and 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 symmetrically arranged with respect to the magnetic pole center line (31) of the corresponding magnetic pole (3); and / or an intermediate magnetic bridge (5) is formed between the two magnetic isolation holes (4) in a pair, the width of one end of the intermediate magnetic bridge (5) far from the axis of the rotor core (1) is F, and the maximum width of the intermediate magnetic bridge (5) is G; wherein, 3.7 ≥ G / F ≥ 1.3, and the width direction of the intermediate magnetic bridge (5) is the distribution direction of the two magnetic isolation holes (4) in a pair.

15. The rotor structure according to claim 1, characterized in that, the total length of the magnetic isolation hole (4) along the extension direction of its first hole body part (41) is L, and the length of the permanent magnet (2) is M; wherein, 0.6 ≥ L / M ≥ 0.

1.

16. The rotor structure according to claim 1, characterized in that, a magnetic isolation bridge (6) is formed between the magnetic isolation hole (4) and the outer peripheral surface of the rotor core (1); along the circumferential direction of the rotor core (1), the width of the magnetic isolation bridge (6) in the radial direction of the rotor core (1) is consistent; and / or the width of the magnetic isolation bridge (6) in the radial direction of the rotor core (1) is P, and the width of the motor air gap of the motor formed by the rotor structure is δ, 1.7 ≥ P / δ ≥ 0.

2.

17. 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 16.

18. A compressor, comprising a motor, characterized in that, the motor is the motor according to claim 17.

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