Rotor structure, compressor and vehicle

Abstract

The utility model relates to the technical field of compressors, and discloses a rotor structure, a compressor and a vehicle. The rotor structure comprises a rotor core and a plurality of magnetic steel assemblies, the rotor core is provided with a central axis, the rotor core is provided with a plurality of mounting grooves extending along the central axis direction, and the mounting grooves are annularly arranged on the central axis; each magnetic steel assembly comprises two pieces of magnetic steel, the magnetic steel is mounted in the mounting groove, the two pieces of magnetic steel are in a V shape, an opening of the V shape faces the direction away from the central axis, and the two pieces of magnetic steel are symmetrically arranged along a symmetric line; the outer wall of the rotor core is provided with a plurality of auxiliary grooves extending along the central axis direction, each magnetic steel assembly corresponds to two auxiliary grooves, and the two auxiliary grooves are symmetrically arranged along a symmetric line. According to the utility model, the harmonic content in the counter electromotive force of the compressor is reduced, the waveform of the counter electromotive force tends to be sine, the generated winding additional loss and temperature rise are reduced, the stability of motor control and the motor efficiency are improved, and the level of motor vibration noise is reduced.

Description

Technical Field

[0001] The present utility model relates to the technical field of compressors, and particularly relates to a rotor structure, a compressor and a vehicle. Background Art

[0002] In recent years, with the increasing requirements for efficiency and environmental protection, new energy vehicles also have higher requirements for the NVH (Noise, Vibration, Harshness) and efficiency of new high-pressure compressor motors. Due to the wide application of permanent magnet synchronous motors in the field of new energy compressors, the rotor adopts a structure with an internal straight magnet. However, the back electromotive force harmonic content generated by the cooperation of the traditional straight magnet structure and the stator slots is relatively large, and the back electromotive force harmonics and electromagnetic forces cannot be optimized more effectively, resulting in relatively prominent NVH problems of the motor, and the compressor cannot meet the application requirements.

[0003] Based on this, there is an urgent need for a rotor structure, a compressor and a vehicle to solve the above existing problems. Summary of the Utility Model

[0004] Based on the above, the purpose of the present utility model is to provide a rotor structure, a compressor and a vehicle, which can reduce the harmonic content in the back electromotive force, make the back electromotive force waveform tend to be sinusoidal, reduce the additional losses and temperature rise of the winding caused thereby, improve the stability of motor control and motor efficiency, and thus reduce the level of motor vibration and noise.

[0005] To achieve the above object, the present utility model adopts the following technical solutions:

[0006] In the first aspect, a rotor structure is provided, including:

[0007] A rotor core, the rotor core is provided with a central axis, the rotor core is provided with a plurality of installation grooves extending along the direction of the central axis, and the installation grooves are arranged in a ring around the central axis;

[0008] A plurality of magnet assemblies, each magnet assembly includes two magnets, the magnets are installed in the installation grooves, the two magnets are in a V shape, the opening of the V shape faces away from the direction of the central axis, and the two magnets are symmetrically arranged along the symmetry line;

[0009] The outer wall of the rotor core is provided with a plurality of auxiliary grooves extending along the direction of the central axis, each magnet assembly corresponds to two auxiliary grooves, and the two auxiliary grooves are symmetrically arranged along the symmetry line.

[0010] As a preferred technical solution of a rotor structure, the cross-section of the auxiliary groove is in a fish-hook shape. The inflection points of the cross-section of one auxiliary groove along the direction away from the symmetry line include point C, point B, and point A in sequence, and the cross-section of the other auxiliary groove includes point C', point B', and point A' in sequence along the direction away from the symmetry line. There is a point O on the central axis, and a first included angle is formed between the two magnetic steels, and a second included angle is formed between OB and OB'; the following formula is satisfied between the first included angle and the second included angle:

[0011] The second included angle = K1 * the first included angle, and the value range of K1 is 0.7 - 0.9.

[0012] As a preferred technical solution of a rotor structure, a third included angle is formed between OA and OB, and a fourth included angle is formed between OB and OC; the following formula is satisfied between the third included angle and the fourth included angle:

[0013] The third included angle = K2 * the fourth included angle, and the value range of K2 is 1.5 - 3.

[0014] As a preferred technical solution of a rotor structure, the depth of the auxiliary groove relative to the outer wall of the rotor core is 0.5 mm - 1 mm.

[0015] As a preferred technical solution of a rotor structure, there are 8 magnetic steel assemblies, and the 8 magnetic steel assemblies are evenly arranged in a ring around the central axis.

[0016] As a preferred technical solution of a rotor structure, the rotor core is provided with a shaft hole for connecting a rotor shaft.

[0017] As a preferred technical solution of a rotor structure, the rotor core is provided with a plurality of weight-reducing holes.

[0018] As a preferred technical solution of a rotor structure, the rotor core is cylindrical.

[0019] In a second aspect, a compressor is provided, including a stator and the rotor structure described in any of the above solutions, and the stator is provided with 12 stator slots in a ring.

[0020] In a third aspect, a vehicle is provided, including the compressor described in any of the above solutions.

[0021] The beneficial effects of the present utility model are:

[0022] The present utility model provides a rotor structure, a compressor and a vehicle. The permanent magnets are installed in the installation grooves of the rotor core. Two permanent magnets are in a V shape, the opening of the V shape faces away from the central axis direction, and the two permanent magnets are symmetrically arranged along the symmetry line; multiple auxiliary grooves extending in the central axis direction are arranged on the outer wall of the rotor core. Each magnet assembly corresponds to two auxiliary grooves, and the two auxiliary grooves are symmetrically arranged along the symmetry line. By arranging the V-shaped magnet assembly and the cooperation of the auxiliary grooves, an unequal air gap between the stator and the rotor structure is constructed, and the harmonic of the air gap reluctance is changed, so that the harmonic of the air gap magnetic field can be effectively weakened, thereby reducing the harmonic content in the back electromotive force, the back electromotive force waveform tends to be sinusoidal, reducing the additional losses and temperature rise of the winding generated thereby, improving the smoothness of motor control and motor efficiency, and thus reducing the level of motor vibration and noise. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0024] Figure 1 It is a schematic structural diagram of the rotor structure provided by the specific embodiment of the present utility model;

[0025] Figure 2 It is an angle schematic diagram of the auxiliary groove of the rotor structure provided by the specific embodiment of the present utility model.

[0026] The markings in the figure are as follows:

[0027] 1. Rotor core; 11. Auxiliary groove; 12. Shaft hole; 13. Weight reduction hole;

[0028] 2. Magnet assembly; 21. Permanent magnet. Specific Embodiments

[0029] The following will further elaborate on the present utility model in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0032] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] As Figure 1 shown, this embodiment provides a rotor structure, which includes a rotor core 1 and a plurality of magnet assemblies 2. The rotor core 1 is provided with a central axis, and the rotor core 1 is provided with a plurality of installation grooves extending along the direction of the central axis, and the installation grooves are annularly arranged around the central axis; a plurality of magnet assemblies 2, each magnet assembly 2 includes two magnets 21, the magnets 21 are installed in the installation grooves, the two magnets 21 are in a V shape, the opening of the V shape faces away from the central axis direction, and the two magnets 21 are symmetrically arranged along the symmetry line; the outer wall of the rotor core 1 is provided with a plurality of auxiliary grooves 11 extending along the direction of the central axis, each magnet assembly 2 corresponds to two auxiliary grooves 11, and the two auxiliary grooves 11 are symmetrically arranged along the symmetry line. In this embodiment, the rotor core 1 is cylindrical.

[0034] Among them, the permanent magnet 21 is installed in the installation groove of the rotor core 1. Two permanent magnets 21 are in a V shape, the opening of the V shape faces away from the central axis direction, and the two permanent magnets 21 are symmetrically arranged along the symmetry line. The permanent magnet assembly 2 can generate a rotor magnetic field. A plurality of auxiliary grooves 11 extending in the central axis direction are provided on the outer wall of the rotor core 1. Each permanent magnet assembly 2 corresponds to two auxiliary grooves 11, and the two auxiliary grooves 11 are symmetrically arranged along the symmetry line. By setting the V-shaped permanent magnet assembly 2 and the cooperation of the auxiliary grooves 11, an unequal air gap between the stator and the rotor structure is constructed, and the harmonics of the air gap reluctance are changed, which can effectively weaken the harmonics of the air gap magnetic field, thereby reducing the harmonic content in the back electromotive force. The back electromotive force waveform tends to be sinusoidal, reducing the additional winding loss and temperature rise caused thereby, improving the smoothness of motor control and motor efficiency, and thus reducing the level of motor vibration and noise.

[0035] In this embodiment, as Figure 1 and Figure 2 shown, the cross-section of the auxiliary groove 11 is in a check mark shape. The inflection points of the cross-section of one auxiliary groove 11 along the direction away from the symmetry line include point C, point B, and point A in sequence, and the cross-section of the other auxiliary groove 11 includes point C', point B', and point A' in sequence along the direction away from the symmetry line. Point O is provided on the central axis. A first included angle is formed between the two permanent magnets 21, and a second included angle is formed between OB and OB'. The following formula is satisfied between the first included angle and the second included angle: Second included angle = K1 * First included angle, and the value range of K1 is 0.7 - 0.9. Specifically, K1 can be 0.7, 0.8, or 0.9. After experimental verification, the first included angle and the second included angle that satisfy this formula can effectively reduce the back electromotive force.

[0036] Further preferably, a third included angle is formed between OA and OB, and a fourth included angle is formed between OB and OC. The following formula is satisfied between the third included angle and the fourth included angle: Third included angle = K2 * Fourth included angle, and the value range of K2 is 1.5 - 3. Specifically, K2 can be 1.5, 1.75, 2, 2.25, 2.5, 2.75, or 3.

[0037] After experimental verification, the dimensions of the auxiliary groove 11 with the first included angle, the second included angle, the third included angle, and the fourth included angle that satisfy the above formula can effectively reduce the back electromotive force. The harmonic distortion rate of the back electromotive force is only 1.8%, while the harmonic distortion rate of the back electromotive force without the auxiliary groove 11 reaches 11.1%.

[0038] Preferably, the depth of the auxiliary groove 11 relative to the outer wall of the rotor core 1 is 0.5 mm - 1 mm. Specifically, the depth of the auxiliary groove 11 relative to the outer wall of the rotor core 1 is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0039] In this embodiment, there are 8 permanent magnet assemblies 2, and the 8 V-shaped permanent magnet assemblies 2 are evenly arranged in a ring around the central axis.

[0040] Preferably, the rotor core 1 is provided with a shaft hole 12 for connecting the rotor shaft. The rotor core 1 is part of the magnetic circuit of the motor. The rotor core 1, the stator, and the air gap between the stator and the rotor structure together constitute the entire magnetic circuit of the motor. The shaft hole 12 is used for installing the rotor shaft.

[0041] More preferably, the rotor core 1 is provided with a plurality of weight-reducing holes 13. The weight-reducing holes 13 can reduce the self-weight of the rotor core 1, reduce the moment of inertia of the rotor structure, reduce the risk of deformation of the rotor structure due to its own weight, and improve the heat dissipation of the rotor structure.

[0042] This embodiment also provides a compressor, including a stator and the above-mentioned rotor structure. The stator ring is provided with 12 stator slots. The rotor structure of this embodiment is applied to a compressor with 8 rotor poles and 12 stator slots, and the effect is better.

[0043] This embodiment also provides a vehicle, including the above-mentioned compressor.

[0044] Note that the above is only the preferred embodiment of the present utility model and the technical principles applied. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in more detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. A rotor structure, characterized in that, Comprising: A rotor core (1), the rotor core (1) being provided with a central axis, the rotor core (1) being provided with a plurality of mounting grooves extending in the direction of the central axis, the mounting grooves being annularly arranged around the central axis; A plurality of magnet assemblies (2), each magnet assembly (2) including two magnets (21), the magnets (21) being installed in the mounting grooves, the two magnets (21) being in a V shape, the opening of the V shape facing away from the central axis direction, and the two magnets (21) being symmetrically arranged along a symmetry line; The outer wall of the rotor core (1) is provided with a plurality of auxiliary grooves (11) extending in the direction of the central axis, each magnet assembly (2) corresponding to two of the auxiliary grooves (11), and the two auxiliary grooves (11) being symmetrically arranged along the symmetry line.

2. The rotor structure according to claim 1, wherein, The cross-section of the auxiliary groove (11) is in a check mark shape. The inflection points of the cross-section of one of the auxiliary grooves (11) in the direction away from the symmetry line include point C, point B, and point A in sequence, and the inflection points of the cross-section of the other auxiliary groove (11) in the direction away from the symmetry line include point C', point B', and point A' in sequence. There is a point O on the central axis. A first included angle is formed between the two magnets (21), and a second included angle is formed between OB and OB'. The following formula is satisfied between the first included angle and the second included angle: Second included angle = K1 * First included angle, where the value range of K1 is 0.7 - 0.

9.

3. The rotor structure according to claim 2, characterized in that, A third included angle is formed between OA and OB, and a fourth included angle is formed between OB and OC. The following formula is satisfied between the third included angle and the fourth included angle: Third included angle = K2 * Fourth included angle, where the value range of K2 is 1.5 - 3.

4. The rotor structure according to claim 1, characterized in that, The depth of the auxiliary groove (11) relative to the outer wall of the rotor core (1) is 0.5 mm - 1 mm.

5. The rotor structure according to claim 1, characterized in that, There are 8 magnet assemblies (2), and the 8 magnet assemblies (2) are evenly annularly arranged around the central axis.

6. The rotor structure according to claim 1, characterized in that, The rotor core (1) is provided with a shaft hole (12), and the shaft hole (12) is used to connect to a rotor shaft.

7. The rotor structure according to any one of claims 1-6, characterized in that, The rotor core (1) is provided with a plurality of weight reduction holes (13).

8. The rotor structure according to any one of claims 1-6, characterized in that, The rotor core (1) is cylindrical.

9. A compressor, characterized in that, Comprising a stator and a rotor structure according to any one of claims 1 - 8, the stator being annularly provided with 12 stator slots.

10. A vehicle, characterized in that, Comprising a compressor according to claim 9.

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