Rotor, motor and compressor

Abstract

The utility model discloses a rotor, a motor and a compressor, the rotor comprises a rotor core and a plurality of permanent magnets, the rotor core is circumferentially provided with a plurality of magnetic steel grooves, each permanent magnet is arranged in the magnetic steel groove and forms a magnetic pole, two adjacent V-shaped magnetic steel grooves are combined to form a V-shaped magnetic steel groove group, and the magnetic steel grooves are arranged in the V-shaped magnetic steel groove group. At least one M-shaped magnetic isolation bridge is arranged between two corresponding adjacent V-shaped magnetic steel groove groups on the outer edge of the rotor core, and a central hump is arranged in the middle of the M-shaped magnetic isolation bridge. According to the utility model, the M-shaped magnetic isolation bridges are arranged between the two adjacent V-shaped magnetic steel groove groups, so that the non-uniform degree of air gaps is effectively adjusted, the radial electromagnetic wave level is effectively reduced, meanwhile, the design of the M-shaped magnetic isolation bridges effectively reduces the harmonic waves of the air gap magnetic field, the air gap flux density is sinusoidal, the sine degree of the back electromotive force waveform is improved, and the service life of the motor is prolonged. Therefore, the torque ripple of the motor during load operation is reduced, and the noise level of the permanent magnet synchronous motor is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a rotor, a motor and a compressor. Background Art

[0002] During the operation of permanent magnet synchronous motors, noise is mainly generated from two aspects: one is the fluctuation of the air gap permeability between the stator and rotor caused by the stator slot opening, and the other is the magnetic field harmonics caused by the stator three-phase AC current harmonics. Specifically, the design of the stator slot opening causes the air gap permeability between the stator and rotor to fluctuate along the circumferential direction during the rotation of the motor, and this fluctuation will further affect the magnetic field distribution inside the motor. At the same time, due to the harmonic components contained in the stator current, magnetic field harmonics will be generated in the air gap of the motor.

[0003] These magnetic field harmonics not only cause back EMF harmonics, but also increase the cogging torque. Back EMF harmonics increase the electromagnetic noise of the motor, while cogging torque increases the torque pulsation of the motor, thereby aggravating the mechanical noise of the motor. The presence of these noises will not only reduce the operating efficiency of the motor, but also have an adverse effect on the stability and reliability of the motor, and even shorten the service life of the motor. Utility Model Content

[0004] The utility model aims to provide a rotor, a motor and a compressor, aiming to solve the problem of high noise of the permanent magnet synchronous motor.

[0005] An embodiment of the utility model provides a rotor, comprising: a rotor core and a plurality of permanent magnets, wherein the rotor core is circumferentially provided with a plurality of magnetic steel slots, each of the permanent magnets is arranged in the magnetic steel slot and forms a magnetic pole, and two adjacent magnetic steel slots are combined into a V-shaped magnetic steel slot group, and at least one M-shaped magnetic isolation bridge is arranged between the outer edge of the rotor core corresponding to two adjacent V-shaped magnetic steel slot groups, and a central hump is arranged in the middle of the M-shaped magnetic isolation bridge.

[0006] Furthermore, a plurality of the V-shaped magnetic steel slot groups are evenly arranged along the circumference of the rotor core, and the V-shaped magnetic steel slot groups are V-shaped magnetic steel slot groups opening toward the radial outside of the rotor core, and the included angle of the V-shaped magnetic steel slot groups is θ, wherein θ≤146°.

[0007] Furthermore, the radius of the central hump is R2, where 0.15 mm <R2<0.25mm。

[0008] Further, the M-shaped magnetic isolation bridge includes: two downward segments and two concave arc segments. One end of one of the concave arc segments is connected to one of the downward segments, and the other end is connected to one end of the central hump. The other end of the central hump is connected to one end of the other concave arc segment, and the other end of the other concave arc segment is connected to the other downward segment;

[0009] The radius of the concave arc segment is R1, where 2.5 mm < R1 < 3 mm.

[0010] Further, there is a peak at the connection between the concave arc segment and the downward segment. The peak is arc-shaped. The circumferential distance between the center of the peak and the center of the concave arc segment is L1. The radius of the concave arc segment is R1, the radius of the central hump is R2, and the radius of the peak is R3, satisfying: 0.7 mm ≤ L1 ≤ (R1 - 3R2) / 2 and 0.2 mm < R3 ≤ 2R2. Wherein, the center of the peak is set on a parallel line close to the side line of the magnetic steel groove of the peak, and the parallel line passes through the center of the concave arc segment.

[0011] Further, the shortest radial distance between the concave arc segment and the side line of the magnetic steel groove close to the concave arc segment is L2, where 0.4 mm ≤ L2 ≤ 0.7 mm.

[0012] Further, a skewed slot is provided in the area of the rotor core corresponding to the V-shaped magnetic steel groove group. The skewed slot is connected to the downward segment. The angle formed by the line connecting the center point of the skewed slot and the center of the rotor core and the magnetic pole symmetry line of the permanent magnet in the V-shaped magnetic steel groove group is A, where the range of A is 18.6° - 19.6° electrical angle.

[0013] Further, the length of the downward segment is H1, and the length of the skewed slot is H2, where 0.1 < H1 / H2 < 0.2.

[0014] Further, a concave arc is provided in the area of the rotor core corresponding to the V-shaped magnetic steel groove group. The angle formed by the line connecting the center point of the concave arc and the center of the rotor core and the magnetic pole symmetry line of the permanent magnet in the V-shaped magnetic steel groove group is B, where 9.5° < A - B < 10°.

[0015] Further, both ends of the M-shaped magnetic isolation bridge are chamfered, and the radius of the chamfer is R, where 0.2 mm ≤ R ≤ 0.4 mm.

[0016] An embodiment of the present invention provides a motor, including: the above-mentioned rotor.

[0017] Furthermore, it also includes: a stator core, wherein the stator core is arranged outside the rotor core, and the radial distance between the inner circle of the stator core and the outer circle of the rotor core is σ, wherein 0.8mm<σ<1.5mm.

[0018] Furthermore, the inner diameter of the stator core is Φ1, and the outer diameter of the stator core is Φ2, wherein 0.56<Φ1 / Φ2<0.58.

[0019] An embodiment of the utility model further provides a compressor, comprising: the above-mentioned motor.

[0020] The utility model discloses a rotor, a motor and a compressor, wherein the rotor comprises: a rotor core and a plurality of permanent magnets, wherein the rotor core is provided with a plurality of magnetic steel slots in the circumferential direction, wherein each of the permanent magnets is provided in the magnetic steel slots and forms a magnetic pole, wherein two adjacent magnetic steel slots are combined into a V-shaped magnetic steel slot group, and at least one M-shaped magnetic isolation bridge is provided between the outer edge of the rotor core corresponding to two adjacent V-shaped magnetic steel slot groups, and a central hump is provided in the middle of the M-shaped magnetic isolation bridge. The utility model effectively adjusts the unevenness of the air gap and effectively reduces the level of radial electromagnetic force waves by providing an M-shaped magnetic isolation bridge between two adjacent V-shaped magnetic steel slot groups, and at the same time, the design of the M-shaped magnetic isolation bridge effectively reduces the harmonics of the air gap magnetic field, and makes the air gap magnetic density sinusoidal, thereby improving the sinusoidality of the back electromotive force waveform, thereby reducing the torque pulsation of the motor when running under load, and greatly reducing the noise level of the permanent magnet synchronous motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic diagram of the structure of the rotor;

[0023] Figure 2 for Figure 1 Partial diagram of a in the figure;

[0024] Figure 3 It is a schematic diagram of the structure and dimensions of the rotor;

[0025] Figure 4 is another schematic diagram of the structure size of the rotor;

[0026] Figure 5 for Figure 4 Partial diagram of middle e;

[0027] Figure 6for Figure 4 Partial diagram of middle b;

[0028] Figure 7 for Figure 4 Partial diagram of middle c;

[0029] Figure 8 : is a comparison effect diagram of radial force waves between the rotor of this embodiment and the comparative rotor;

[0030] Fig. 9 This is a comparison effect diagram of the peak-to-peak values ​​of the cogging torque of the rotor of this embodiment and the comparative rotor;

[0031] Fig.10 The figure is a comparison effect diagram of the air gap magnetic flux between the rotor of the present embodiment and the comparative rotor;

[0032] Fig.11 : is a comparison effect diagram of the no-load back electromotive force of the rotor of this embodiment and the comparative rotor;

[0033] Fig.12 It is the structural diagram of the motor;

[0034] Description of the markings in the figure:

[0035] 1. Rotor core; 2. Permanent magnet; 3. Magnetic steel slot; 4. V-shaped magnetic steel slot group; 5. M-shaped magnetic isolation bridge; 6. Central hump; 7. Downscore segment; 8. Concave arc segment; 9. Peak; 10. Oblique slot; 11. Concave arc; 12. Chamfer; 13. Stator core. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0038] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0039] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0040] See also Figure 1 and Figure 2 The present embodiment provides a rotor, comprising: a rotor core 1 and a plurality of permanent magnets 2. The rotor core 1 is circumferentially provided with a plurality of magnetic steel slots 3. Each permanent magnet 2 is arranged in the magnetic steel slot 3 and forms a magnetic pole. Two adjacent magnetic steel slots 3 are combined into a V-shaped magnetic steel slot group 4. At least one M-shaped magnetic isolation bridge 5 is arranged between two adjacent V-shaped magnetic steel slot groups 4 on the outer edge of the rotor core 1. A central hump 6 is arranged in the middle of the M-shaped magnetic isolation bridge 5.

[0041] The utility model effectively adjusts the unevenness of the air gap and effectively reduces the level of radial electromagnetic force waves by arranging an M-shaped magnetic isolation bridge 5 between two adjacent V-shaped magnetic steel slot groups 4. At the same time, the design of the M-shaped magnetic isolation bridge 5 effectively reduces the air gap magnetic field harmonics, makes the air gap magnetic flux sinusoidal, improves the sinusoidality of the back electromotive force waveform, thereby reducing the torque pulsation of the motor when running under load and greatly reducing the noise level of the permanent magnet synchronous motor.

[0042] In this embodiment, please refer to Figure 3 and Figure 4 A plurality of V-shaped magnetic steel slot groups 4 are evenly arranged along the circumference of the rotor core 1 . The V-shaped magnetic steel slot groups 4 are V-shaped magnetic steel slot groups opening toward the radial outside of the rotor core 1 . The included angle of the V-shaped magnetic steel slot groups is θ, where θ≤146°.

[0043] The V-shaped magnetic steel slot group 4 is evenly arranged along the circumference of the rotor core 1, which means that the magnetic field is evenly distributed around the rotor. This uniformity helps to improve the operating stability and efficiency of the motor and reduce the vibration and noise caused by the uneven magnetic field. The V-shaped magnetic steel slot group can increase the magnetic resistance of the cross-axis magnetic circuit and reduce the inductance of the cross-axis, thereby weakening the salient pole effect of the rotor and reducing the torque fluctuation under load. The limitation of the angle of the V-shaped magnetic steel slot group can reduce magnetic leakage, thereby improving the performance of the motor.

[0044] In a specific application scenario, six V-shaped magnetic steel slot groups are provided, and the six V-shaped magnetic steel slot groups are evenly arranged along the circumference of the rotor core 1. The included angle of the V-shaped magnetic steel slot groups is θ, where θ≤146°.

[0045] In this embodiment, the central hump 6 is arc-shaped, and the radius of the central hump 6 is R2 (eg Figure 5 As shown), where 0.15mm <R2<0.25mm。

[0046] To reduce the magnetic leakage between magnetic poles, increase the magnetic isolation effect, and improve the output power of the permanent magnet synchronous motor, it is necessary to limit the radius of the central hump 6. Therefore, the radius R2 of the central hump 6 should satisfy: 0.15mm < R2 < 0.25mm.

[0047] In this embodiment, please refer to Figure 2 , the M-shaped magnetic isolation bridge 5 includes: two downward segments 7 and two concave arc segments 8. One end of one concave arc segment 8 is connected to one of the downward segments 7, and the other end is connected to one end of the central hump 6. The other end of the central hump 6 is connected to one end of the other concave arc segment 8, and the other end of the other concave arc segment 8 is connected to the other downward segment 7.

[0048] The setting of the concave arc segment 8 can increase the irregularity of the air gap and effectively reduce the level of radial electromagnetic force waves. The setting of the concave arc segment 8 can also improve the sinusoidality of the back electromotive force waveform, thereby reducing the torque ripple during the load operation of the motor and significantly reducing the noise level of the permanent magnet synchronous motor.

[0049] Furthermore, the radius of the concave arc segment 8 is R1 (as Figure 6 shown), where 2.5mm < R1 < 3mm.

[0050] To further effectively adjust the unevenness of the air gap, effectively reduce the level of radial electromagnetic force waves, and at the same time further reduce the air gap magnetic field harmonics, make the air gap magnetic density sinusoidal, and improve the sinusoidality of the back electromotive force waveform, the radius of the concave arc segment 8 needs to be limited within a suitable range. Therefore, the radius R1 of the concave arc segment 8 should satisfy: 2.5mm < R1 < 3mm.

[0051] In some embodiments, please refer to Figure 2-6 , at the connection between the concave arc segment 8 and the downward segment 7, there is a peak 9. The peak 9 is arc-shaped. The circumferential distance between the center of the peak 9 and the center of the concave arc segment 8 is L1. The radius of the concave arc segment 8 is R1, the radius of the central hump 6 is R2, and the radius of the peak 9 is R3, satisfying: 0.7mm ≤ L1 ≤ (R1 - 3R2) / 2 and 0.2mm < R3 ≤ 2R2. Among them, the center of the peak 9 is set on the parallel line of the side line of the magnetic steel slot 3 close to the peak 9, and the parallel line passes through the center of the concave arc segment 8.

[0052] To increase the non-uniformity of the air gap, the M-shaped magnetic isolation bridge 5 needs to be set with unevenness, so that the total amount of harmonics of the air gap magnetic field is minimized. Therefore, the circumferential distance L1 between the center of the peak 9 and the center of the concave arc segment 8 should satisfy: 0.7mm ≤ L1 ≤ (R1 - 3R2) / 2, and the radius R3 of the peak 9 should satisfy: 0.2mm < R3 ≤ 2R2.

[0053] Furthermore, there are two peaks 9 on the M-shaped magnetic isolation bridge 5. The two peaks 9 are symmetric about the symmetry line of two adjacent V-shaped magnetic steel slot groups 4 (i.e., Figure 1 The symmetrically arranged peaks 9 support each other in structure, thus enhancing the overall strength of the magnetic isolation bridge. When the motor rotates at high speed, this structure can resist the stress generated by the centrifugal force and ensure the stable operation of the motor.

[0054] In this embodiment, the shortest radial distance between the concave arc segment 8 and the edge line of the magnetic steel slot 3 close to the concave arc segment 8 is L2 (e.g. Figure 6 As shown), wherein 0.4mm≤L2≤0.7mm.

[0055] Limiting the range of the shortest radial distance L2 between the concave arc segment 8 and the edge line of the magnetic steel slot 3 close to the concave arc segment 8 helps to optimize the distribution of the magnetic flux between the magnetic steel slot 3 and the concave arc segment 8. The unevenness of the magnetic flux distribution will lead to an increase in torque pulsation and cogging torque. By limiting 0.4mm≤L2≤0.7mm, the magnetic flux distribution can be made more uniform, thereby reducing torque pulsation and cogging torque. The reduction of torque pulsation helps to enhance the stability of the motor. Stable torque output means that the motor can run more smoothly and reduce vibration and noise caused by torque fluctuations.

[0056] In this embodiment, the rotor core 1 is provided with an inclined slot 10 (such as Figure 1 and Figure 2 As shown), the inclined slot 10 is connected to the lower section 7, and the line connecting the center point of the inclined slot 10 and the center of the rotor core 1 is aligned with the magnetic pole symmetry line of the permanent magnet 2 in the V-shaped magnetic steel slot group 4 (i.e. Figure 1 The angle formed by the d axis in the Figure 4 As shown), where A ranges from 18.6° to 19.6° electrical angle.

[0057] Setting the angle A formed by the line connecting the center point of the inclined slot 10 and the center of the rotor core 1 and the magnetic pole symmetry line of the permanent magnet 2 in the V-shaped magnetic steel slot group 4 to an electrical angle of 18.6°-19.6° can effectively reduce the torque fluctuation and no-load back electromotive force harmonics of the motor, and the noise suppression effect is better.

[0058] For further information, see Figure 7 , the length of the lower section 7 is H1, the length of the inclined groove 10 is H2, where 0.1

[0059] By limiting the ratio of the length H1 of the lower section 7 and the length H2 of the inclined slot 10 within 0.1-0.2, on the one hand, the thickness of the M-type magnetic isolation bridge 5 can be ensured, thereby ensuring the structural strength of the M-type magnetic isolation bridge 5; on the other hand, limiting the ratio of the length H1 of the lower section 7 and the length H2 of the inclined slot 10 within 0.1-0.2 can optimize the path of the magnetic field, making the magnetic field more concentrated and stable, thereby reducing the occurrence of magnetic leakage. ​

[0060] In this embodiment, a concave arc 11 is provided in the region of the rotor core 1 corresponding to the V-shaped magnet groove group 4 (as Figure 1 shown), and the angle formed by the line connecting the center point of the concave arc 11 and the center of the rotor core 1 and the magnetic pole symmetry line of the permanent magnet 2 in the V-shaped magnet groove group 4 is B (as Figure 4 shown), where 9.5° < A - B < 10°.

[0061] The setting of the concave arc 11 can effectively adjust the unevenness of the air gap and effectively reduce the level of the radial electromagnetic force wave. At the same time, the design of the M-shaped magnetic isolation bridge 5 effectively reduces the air gap magnetic field harmonics and makes the air gap magnetic density sinusoidal, improving the sinusoidality of the back electromotive force waveform, thereby reducing the torque ripple during the load operation of the motor and greatly reducing the noise level of the permanent magnet synchronous motor. And setting 9.5° < A - B < 10° can define the positional relationship between the concave arc 11 and the skewed slot 10, thereby ensuring that the magnetic field distribution generated by the permanent magnet 2 in the rotor core 1 is more uniform and concentrated.

[0062] Furthermore, a plurality of concave arcs 11 are provided in the region of the rotor core 1 corresponding to the V-shaped magnet groove group 4. One end of the concave arc 11 is connected to the skewed slot 10, and the plurality of concave arcs 11 are symmetric about the magnetic pole symmetry line of the permanent magnet 2 in the V-shaped magnet groove group 4.

[0063] The symmetric setting of the plurality of concave arcs 11 can generate a non-uniform air gap, thereby improving the sinusoidality of the air gap magnetic field, reducing the torque ripple and cogging torque of the motor, significantly reducing the noise of the motor, and improving the operating efficiency and stability of the motor.

[0064] Among them, the concave arc 11 is an inner concave arc shape.

[0065] In this embodiment, please refer to Figure 2 and Figure 5 , both ends of the M-shaped magnetic isolation bridge 5 are chamfered, and the radius of the chamfer 12 is R, where 0.2 mm ≤ R ≤ 0.4 mm.

[0066] By setting the chamfer 12, sharp corners can be reduced, the adhesion of the electroplating layer of the silicon steel sheet can be increased, and at the same time, the magnetic field distortion caused by the sharp corners can be avoided, thereby improving the magnetic concentration effect at both ends of the M-shaped magnetic isolation bridge 5 and improving the sinusoidality of the air gap magnetic density waveform.

[0067] Please refer to Figure 8-11Compared with the rotor without M-type magnetic isolation bridge, skew slot and concave arc, the present embodiment not only makes the air gap magnetic flux waveform tend to be sinusoidal through the above structural design, but also significantly improves the sinusoidal degree of the back electromotive force waveform, and significantly reduces the distortion rate of the back electromotive force. By setting the M-type magnetic isolation bridge 5, the air gap magnetic resistance becomes larger, the air gap magnetic flux is reduced, and the M-type magnetic isolation bridge 5 can convert the air gap magnetic flux peak 9 into a sinusoidal waveform. In addition, through the above structural design, the radial electromagnetic force of the motor is reduced by about 59% in the third order and sixth times, and the harmonic content of the air gap magnetic flux is also significantly reduced. At the same time, the tooth torque and torque pulsation are also greatly reduced, and the vibration and noise of the motor are greatly improved.

[0068] This embodiment also provides a motor, including: the rotor of the above embodiment.

[0069] For further information, see Fig.12 The motor further includes: a stator core 13, which is arranged on the outside of the rotor core 1, and a radial distance between an inner circle of the stator core 13 and an outer circle of the rotor core 1 is σ, wherein 0.8mm<σ<1.5mm.

[0070] When the radial distance between the inner circle of the stator core 13 and the outer circle of the rotor core 1 is too small, the magnetic field may be over-concentrated. When the radial distance between the inner circle of the stator core 13 and the outer circle of the rotor core 1 is too large, the magnetic field strength may be reduced. Limiting the radial distance between the inner circle of the stator core 13 and the outer circle of the rotor core 1 to 0.8-1.5mm can improve the power density of the motor and reduce iron loss, while also helping to reduce the noise and vibration generated by the motor during operation.

[0071] In this embodiment, the inner diameter of the stator core 13 is Φ1, and the outer diameter of the stator core 13 is Φ2, wherein 0.56<Φ1 / Φ2<0.58.

[0072] The ratio of the inner diameter of the stator core 13 to the outer diameter of the stator core 13 is limited to 0.56-0.58, so that the motor has a larger split ratio, thereby ensuring that the efficiency of the motor is significantly improved, and at the same time ensuring that the stator yoke has a certain thickness, thereby ensuring the structural rigidity of the stator core 13, and at the same time reducing iron loss and improving the noise of the motor.

[0073] This embodiment also provides a compressor, including: the motor of the above embodiment.

[0074] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0075] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0076] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A rotor, characterized in that: Comprising: A rotor core and a plurality of permanent magnets. The rotor core is circumferentially provided with a plurality of magnet slots. Each permanent magnet is arranged in the magnet slot to form a magnetic pole. Two adjacent magnet slots are combined into a V-shaped magnet slot group. At least one M-shaped magnetic isolation bridge is arranged on the outer edge of the rotor core corresponding to the space between two adjacent V-shaped magnet slot groups. A central hump is arranged in the middle of the M-shaped magnetic isolation bridge.

2. The rotor according to claim 1, characterized in that A plurality of the V-shaped magnet slot groups are evenly arranged along the circumferential direction of the rotor core. The V-shaped magnet slot group is a V-shaped magnet slot group with an opening facing the radially outer side of the rotor core. The included angle of the V-shaped magnet slot group is θ, where θ ≤ 146°.

3. The rotor according to claim 1, characterized in that The central hump is arc-shaped. The radius of the central hump is R2, where 0.15 mm < R2 < 0.25 mm.

4. The rotor according to claim 1, characterized in that The M-shaped magnetic isolation bridge includes: two downward segments and two concave arc segments. One end of one concave arc segment is connected to one of the downward segments, and the other end is connected to one end of the central hump. The other end of the central hump is connected to one end of the other concave arc segment. The other end of the other concave arc segment is connected to the other downward segment. The radius of the concave arc segment is R1, where 2.5 mm < R1 < 3 mm.

5. The rotor according to claim 4, characterized in that The connection part between the concave arc segment and the downward segment has a peak. The peak is arc-shaped. The circumferential distance between the center of the peak and the center of the concave arc segment is L1. The radius of the concave arc segment is R1. The radius of the central hump is R2. The radius of the peak is R3, satisfying: 0.7 mm ≤ L1 ≤ (R1 - 3R2) / 2 and 0.2 mm < R3 ≤ 2R2. Wherein, the center of the peak is arranged on a parallel line of the side line of the magnet slot close to the peak, and the parallel line passes through the center of the concave arc segment.

6. The rotor according to claim 4, characterized in that The shortest radial distance between the concave arc segment and the side line of the magnet slot close to the concave arc segment is L2, where 0.4 mm ≤ L2 ≤ 0.7 mm.

7. The rotor according to claim 4, characterized in that The rotor core is provided with a skewed slot in the area corresponding to the V-shaped magnet slot group. The skewed slot is connected to the downward segment. The included angle A formed by the connection line between the center point of the skewed slot and the center of the rotor core and the magnetic pole symmetry line of the permanent magnet in the V-shaped magnet slot group ranges from 18.6° to 19.6° electrical angle.

8. The rotor according to claim 7, characterized in that The length of the downward segment is H1, and the length of the skewed slot is H2, where 0.1 < H1 / H2 < 0.

2.

9. The rotor according to claim 7, characterized in that The rotor core is provided with a concave arc in the area corresponding to the V-shaped magnet slot group. The included angle B formed by the connection line between the center point of the concave arc and the center of the rotor core and the magnetic pole symmetry line of the permanent magnet in the V-shaped magnet slot group satisfies 9.5° < A - B < 10°.

10. The rotor according to claim 1, characterized in that Both ends of the M-shaped magnetic isolation bridge are chamfered. The radius of the chamfer is R, where 0.2 mm ≤ R ≤ 0.4 mm.

11. A motor, characterized in that: Comprising: The rotor according to any one of claims 1-10.

12. The motor according to claim 11, characterized in that Further comprising: A stator core. The stator core is arranged outside the rotor core. The radial distance between the inner circle of the stator core and the outer circle of the rotor core is σ, where 0.8 mm < σ < 1.5 mm.

13. The motor according to claim 12, characterized in that The inner diameter of the stator core is Φ1, and the outer diameter of the stator core is Φ2, wherein 0.56<Φ1 / Φ2<0.

58.

14. A compressor, characterized in that: include: A motor as claimed in any one of claims 11 to 13.

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